This version is based on 6.8-rc2, tested with the latest upstream
gcc and binutils (20240129).
v6:
-- Add "-mno-relax" option
-- Remove "-fno-optimize-sibling-calls" option
-- Remove "-falign-functions=4 -falign-labels=4" options
-- Remove "#ifdef CONFIG_CPU_HAS_LBT" in lbt.S
-- Remove patch "objtool: Check local label about sibling call"
-- Silence the objtool warnings under CONFIG_FUNCTION_TRACER
-- Add livepatching support and fix the problems when testing
Tiezhu Yang (8):
objtool/LoongArch: Enable objtool to be built
objtool/LoongArch: Implement instruction decoder
objtool/x86: Separate arch-specific and generic parts
objtool/LoongArch: Enable orc to be built
objtool: Check local label in add_dead_ends()
objtool: Check local label in read_unwind_hints()
LoongArch: Add ORC stack unwinder support
LoongArch: Add kernel livepatching support
arch/loongarch/Kconfig | 6 +
arch/loongarch/Kconfig.debug | 11 +
arch/loongarch/Makefile | 23 +-
arch/loongarch/include/asm/Kbuild | 2 +
arch/loongarch/include/asm/bug.h | 1 +
arch/loongarch/include/asm/exception.h | 2 +
arch/loongarch/include/asm/module.h | 7 +
arch/loongarch/include/asm/orc_header.h | 18 +
arch/loongarch/include/asm/orc_lookup.h | 31 ++
arch/loongarch/include/asm/orc_types.h | 58 ++
arch/loongarch/include/asm/stackframe.h | 3 +
arch/loongarch/include/asm/thread_info.h | 2 +
arch/loongarch/include/asm/unwind.h | 20 +-
arch/loongarch/include/asm/unwind_hints.h | 28 +
arch/loongarch/kernel/Makefile | 4 +
arch/loongarch/kernel/entry.S | 5 +
arch/loongarch/kernel/fpu.S | 7 +
arch/loongarch/kernel/genex.S | 6 +
arch/loongarch/kernel/lbt.S | 2 +
arch/loongarch/kernel/mcount_dyn.S | 6 +
arch/loongarch/kernel/module.c | 22 +-
arch/loongarch/kernel/relocate_kernel.S | 8 +-
arch/loongarch/kernel/rethook_trampoline.S | 1 +
arch/loongarch/kernel/setup.c | 2 +
arch/loongarch/kernel/stacktrace.c | 42 ++
arch/loongarch/kernel/traps.c | 42 +-
arch/loongarch/kernel/unwind_orc.c | 516 ++++++++++++++++++
arch/loongarch/kernel/vmlinux.lds.S | 3 +
arch/loongarch/kvm/switch.S | 9 +-
arch/loongarch/lib/clear_user.S | 2 +
arch/loongarch/lib/copy_user.S | 2 +
arch/loongarch/lib/memcpy.S | 2 +
arch/loongarch/lib/memset.S | 2 +
arch/loongarch/mm/tlb.c | 27 +-
arch/loongarch/mm/tlbex.S | 9 +
arch/loongarch/vdso/Makefile | 1 +
include/linux/compiler.h | 9 +
scripts/Makefile | 7 +-
tools/arch/loongarch/include/asm/inst.h | 161 ++++++
tools/arch/loongarch/include/asm/orc_types.h | 58 ++
tools/include/linux/bitops.h | 11 +
tools/objtool/Makefile | 4 +
tools/objtool/arch/loongarch/Build | 3 +
tools/objtool/arch/loongarch/decode.c | 356 ++++++++++++
.../arch/loongarch/include/arch/cfi_regs.h | 22 +
.../objtool/arch/loongarch/include/arch/elf.h | 30 +
.../arch/loongarch/include/arch/special.h | 33 ++
tools/objtool/arch/loongarch/orc.c | 171 ++++++
tools/objtool/arch/loongarch/special.c | 15 +
tools/objtool/arch/x86/Build | 1 +
tools/objtool/arch/x86/orc.c | 188 +++++++
tools/objtool/check.c | 52 +-
tools/objtool/include/objtool/elf.h | 1 +
tools/objtool/include/objtool/orc.h | 14 +
tools/objtool/orc_dump.c | 69 +--
tools/objtool/orc_gen.c | 113 +---
56 files changed, 2011 insertions(+), 239 deletions(-)
create mode 100644 arch/loongarch/include/asm/orc_header.h
create mode 100644 arch/loongarch/include/asm/orc_lookup.h
create mode 100644 arch/loongarch/include/asm/orc_types.h
create mode 100644 arch/loongarch/include/asm/unwind_hints.h
create mode 100644 arch/loongarch/kernel/unwind_orc.c
create mode 100644 tools/arch/loongarch/include/asm/inst.h
create mode 100644 tools/arch/loongarch/include/asm/orc_types.h
create mode 100644 tools/objtool/arch/loongarch/Build
create mode 100644 tools/objtool/arch/loongarch/decode.c
create mode 100644 tools/objtool/arch/loongarch/include/arch/cfi_regs.h
create mode 100644 tools/objtool/arch/loongarch/include/arch/elf.h
create mode 100644 tools/objtool/arch/loongarch/include/arch/special.h
create mode 100644 tools/objtool/arch/loongarch/orc.c
create mode 100644 tools/objtool/arch/loongarch/special.c
create mode 100644 tools/objtool/arch/x86/orc.c
create mode 100644 tools/objtool/include/objtool/orc.h
--
2.42.0
When update the latest upstream gcc and binutils, it generates more
objtool warnings on LoongArch, like this:
init/main.o: warning: objtool: unexpected relocation symbol type in .rela.discard.unreachable
We can see that the reloc sym name is local label instead of section
in relocation section '.rela.discard.unreachable', in this case, the
reloc sym type is STT_NOTYPE instead of STT_SECTION.
As suggested by Peter Zijlstra, add "local_label" member in struct
symbol, then set it as true if symbol type is STT_NOTYPE and symbol
name starts with ".L" string in classify_symbols().
Let us check reloc->sym->local_label to not return -1, and also use
reloc->sym->offset instead of reloc addend which is 0 to find the
corresponding instruction. At the same time, replace the variable
"addend" with "offset" to reflect the reality.
Here are some detailed info:
[fedora@linux 6.8.test]$ gcc --version
gcc (GCC) 14.0.1 20240129 (experimental)
[fedora@linux 6.8.test]$ as --version
GNU assembler (GNU Binutils) 2.42.50.20240129
[fedora@linux 6.8.test]$ readelf -r init/main.o | grep -A 2 "rela.discard.unreachable"
Relocation section '.rela.discard.unreachable' at offset 0x6028 contains 1 entry:
Offset Info Type Sym. Value Sym. Name + Addend
000000000000 00d900000063 R_LARCH_32_PCREL 00000000000002c4 .L500^B1 + 0
Signed-off-by: Tiezhu Yang <[email protected]>
---
tools/objtool/check.c | 40 +++++++++++++++++------------
tools/objtool/include/objtool/elf.h | 1 +
2 files changed, 24 insertions(+), 17 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 548ec3cd7c00..d0e82c729dd9 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -20,6 +20,7 @@
#include <linux/hashtable.h>
#include <linux/kernel.h>
#include <linux/static_call_types.h>
+#include <linux/string.h>
struct alternative {
struct alternative *next;
@@ -584,7 +585,7 @@ static int add_dead_ends(struct objtool_file *file)
struct section *rsec;
struct reloc *reloc;
struct instruction *insn;
- s64 addend;
+ unsigned long offset;
/*
* Check for manually annotated dead ends.
@@ -594,27 +595,28 @@ static int add_dead_ends(struct objtool_file *file)
goto reachable;
for_each_reloc(rsec, reloc) {
-
- if (reloc->sym->type != STT_SECTION) {
+ if (reloc->sym->type == STT_SECTION) {
+ offset = reloc_addend(reloc);
+ } else if (reloc->sym->local_label) {
+ offset = reloc->sym->offset;
+ } else {
WARN("unexpected relocation symbol type in %s", rsec->name);
return -1;
}
- addend = reloc_addend(reloc);
-
- insn = find_insn(file, reloc->sym->sec, addend);
+ insn = find_insn(file, reloc->sym->sec, offset);
if (insn)
insn = prev_insn_same_sec(file, insn);
- else if (addend == reloc->sym->sec->sh.sh_size) {
+ else if (offset == reloc->sym->sec->sh.sh_size) {
insn = find_last_insn(file, reloc->sym->sec);
if (!insn) {
WARN("can't find unreachable insn at %s+0x%" PRIx64,
- reloc->sym->sec->name, addend);
+ reloc->sym->sec->name, offset);
return -1;
}
} else {
WARN("can't find unreachable insn at %s+0x%" PRIx64,
- reloc->sym->sec->name, addend);
+ reloc->sym->sec->name, offset);
return -1;
}
@@ -633,27 +635,28 @@ static int add_dead_ends(struct objtool_file *file)
return 0;
for_each_reloc(rsec, reloc) {
-
- if (reloc->sym->type != STT_SECTION) {
+ if (reloc->sym->type == STT_SECTION) {
+ offset = reloc_addend(reloc);
+ } else if (reloc->sym->local_label) {
+ offset = reloc->sym->offset;
+ } else {
WARN("unexpected relocation symbol type in %s", rsec->name);
return -1;
}
- addend = reloc_addend(reloc);
-
- insn = find_insn(file, reloc->sym->sec, addend);
+ insn = find_insn(file, reloc->sym->sec, offset);
if (insn)
insn = prev_insn_same_sec(file, insn);
- else if (addend == reloc->sym->sec->sh.sh_size) {
+ else if (offset == reloc->sym->sec->sh.sh_size) {
insn = find_last_insn(file, reloc->sym->sec);
if (!insn) {
WARN("can't find reachable insn at %s+0x%" PRIx64,
- reloc->sym->sec->name, addend);
+ reloc->sym->sec->name, offset);
return -1;
}
} else {
WARN("can't find reachable insn at %s+0x%" PRIx64,
- reloc->sym->sec->name, addend);
+ reloc->sym->sec->name, offset);
return -1;
}
@@ -2522,6 +2525,9 @@ static int classify_symbols(struct objtool_file *file)
struct symbol *func;
for_each_sym(file, func) {
+ if (func->type == STT_NOTYPE && strstarts(func->name, ".L"))
+ func->local_label = true;
+
if (func->bind != STB_GLOBAL)
continue;
diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h
index 9f71e988eca4..2b8a69de4db8 100644
--- a/tools/objtool/include/objtool/elf.h
+++ b/tools/objtool/include/objtool/elf.h
@@ -67,6 +67,7 @@ struct symbol {
u8 profiling_func : 1;
u8 warned : 1;
u8 embedded_insn : 1;
+ u8 local_label : 1;
struct list_head pv_target;
struct reloc *relocs;
};
--
2.42.0
Only copy the minimal definitions of instruction opcodes and formats
in inst.h from arch/loongarch to tools/arch/loongarch, and also copy
the definition of sign_extend64() to tools/include/linux/bitops.h to
decode the following kinds of instructions:
(1) stack pointer related instructions
addi.d, ld.d, st.d, ldptr.d and stptr.d
(2) branch and jump related instructions
beq, bne, blt, bge, bltu, bgeu, beqz, bnez, bceqz, bcnez, b, bl and jirl
(3) other instructions
break, nop and ertn
See more info about instructions in LoongArch Reference Manual:
https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html
Co-developed-by: Jinyang He <[email protected]>
Signed-off-by: Jinyang He <[email protected]>
Co-developed-by: Youling Tang <[email protected]>
Signed-off-by: Youling Tang <[email protected]>
Signed-off-by: Tiezhu Yang <[email protected]>
---
tools/arch/loongarch/include/asm/inst.h | 161 ++++++++++++++
tools/include/linux/bitops.h | 11 +
tools/objtool/arch/loongarch/decode.c | 273 +++++++++++++++++++++++-
3 files changed, 443 insertions(+), 2 deletions(-)
create mode 100644 tools/arch/loongarch/include/asm/inst.h
diff --git a/tools/arch/loongarch/include/asm/inst.h b/tools/arch/loongarch/include/asm/inst.h
new file mode 100644
index 000000000000..c25b5853181d
--- /dev/null
+++ b/tools/arch/loongarch/include/asm/inst.h
@@ -0,0 +1,161 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#ifndef _ASM_INST_H
+#define _ASM_INST_H
+
+#include <linux/bitops.h>
+
+#define LOONGARCH_INSN_NOP 0x03400000
+
+enum reg0i15_op {
+ break_op = 0x54,
+};
+
+enum reg0i26_op {
+ b_op = 0x14,
+ bl_op = 0x15,
+};
+
+enum reg1i21_op {
+ beqz_op = 0x10,
+ bnez_op = 0x11,
+ bceqz_op = 0x12, /* bits[9:8] = 0x00 */
+ bcnez_op = 0x12, /* bits[9:8] = 0x01 */
+};
+
+enum reg2_op {
+ ertn_op = 0x1920e,
+};
+
+enum reg2i12_op {
+ addid_op = 0x0b,
+ andi_op = 0x0d,
+ ldd_op = 0xa3,
+ std_op = 0xa7,
+};
+
+enum reg2i14_op {
+ ldptrd_op = 0x26,
+ stptrd_op = 0x27,
+};
+
+enum reg2i16_op {
+ jirl_op = 0x13,
+ beq_op = 0x16,
+ bne_op = 0x17,
+ blt_op = 0x18,
+ bge_op = 0x19,
+ bltu_op = 0x1a,
+ bgeu_op = 0x1b,
+};
+
+struct reg0i15_format {
+ unsigned int immediate : 15;
+ unsigned int opcode : 17;
+};
+
+struct reg0i26_format {
+ unsigned int immediate_h : 10;
+ unsigned int immediate_l : 16;
+ unsigned int opcode : 6;
+};
+
+struct reg1i21_format {
+ unsigned int immediate_h : 5;
+ unsigned int rj : 5;
+ unsigned int immediate_l : 16;
+ unsigned int opcode : 6;
+};
+
+struct reg2_format {
+ unsigned int rd : 5;
+ unsigned int rj : 5;
+ unsigned int opcode : 22;
+};
+
+struct reg2i12_format {
+ unsigned int rd : 5;
+ unsigned int rj : 5;
+ unsigned int immediate : 12;
+ unsigned int opcode : 10;
+};
+
+struct reg2i14_format {
+ unsigned int rd : 5;
+ unsigned int rj : 5;
+ unsigned int immediate : 14;
+ unsigned int opcode : 8;
+};
+
+struct reg2i16_format {
+ unsigned int rd : 5;
+ unsigned int rj : 5;
+ unsigned int immediate : 16;
+ unsigned int opcode : 6;
+};
+
+union loongarch_instruction {
+ unsigned int word;
+ struct reg0i15_format reg0i15_format;
+ struct reg0i26_format reg0i26_format;
+ struct reg1i21_format reg1i21_format;
+ struct reg2_format reg2_format;
+ struct reg2i12_format reg2i12_format;
+ struct reg2i14_format reg2i14_format;
+ struct reg2i16_format reg2i16_format;
+};
+
+#define LOONGARCH_INSN_SIZE sizeof(union loongarch_instruction)
+
+enum loongarch_gpr {
+ LOONGARCH_GPR_ZERO = 0,
+ LOONGARCH_GPR_RA = 1,
+ LOONGARCH_GPR_TP = 2,
+ LOONGARCH_GPR_SP = 3,
+ LOONGARCH_GPR_A0 = 4, /* Reused as V0 for return value */
+ LOONGARCH_GPR_A1, /* Reused as V1 for return value */
+ LOONGARCH_GPR_A2,
+ LOONGARCH_GPR_A3,
+ LOONGARCH_GPR_A4,
+ LOONGARCH_GPR_A5,
+ LOONGARCH_GPR_A6,
+ LOONGARCH_GPR_A7,
+ LOONGARCH_GPR_T0 = 12,
+ LOONGARCH_GPR_T1,
+ LOONGARCH_GPR_T2,
+ LOONGARCH_GPR_T3,
+ LOONGARCH_GPR_T4,
+ LOONGARCH_GPR_T5,
+ LOONGARCH_GPR_T6,
+ LOONGARCH_GPR_T7,
+ LOONGARCH_GPR_T8,
+ LOONGARCH_GPR_FP = 22,
+ LOONGARCH_GPR_S0 = 23,
+ LOONGARCH_GPR_S1,
+ LOONGARCH_GPR_S2,
+ LOONGARCH_GPR_S3,
+ LOONGARCH_GPR_S4,
+ LOONGARCH_GPR_S5,
+ LOONGARCH_GPR_S6,
+ LOONGARCH_GPR_S7,
+ LOONGARCH_GPR_S8,
+ LOONGARCH_GPR_MAX
+};
+
+#define DEF_EMIT_REG2I16_FORMAT(NAME, OP) \
+static inline void emit_##NAME(union loongarch_instruction *insn, \
+ enum loongarch_gpr rj, \
+ enum loongarch_gpr rd, \
+ int offset) \
+{ \
+ insn->reg2i16_format.opcode = OP; \
+ insn->reg2i16_format.immediate = offset; \
+ insn->reg2i16_format.rj = rj; \
+ insn->reg2i16_format.rd = rd; \
+}
+
+DEF_EMIT_REG2I16_FORMAT(jirl, jirl_op)
+
+#endif /* _ASM_INST_H */
diff --git a/tools/include/linux/bitops.h b/tools/include/linux/bitops.h
index f18683b95ea6..7319f6ced108 100644
--- a/tools/include/linux/bitops.h
+++ b/tools/include/linux/bitops.h
@@ -87,4 +87,15 @@ static inline __u32 rol32(__u32 word, unsigned int shift)
return (word << shift) | (word >> ((-shift) & 31));
}
+/**
+ * sign_extend64 - sign extend a 64-bit value using specified bit as sign-bit
+ * @value: value to sign extend
+ * @index: 0 based bit index (0<=index<64) to sign bit
+ */
+static __always_inline __s64 sign_extend64(__u64 value, int index)
+{
+ __u8 shift = 63 - index;
+ return (__s64)(value << shift) >> shift;
+}
+
#endif
diff --git a/tools/objtool/arch/loongarch/decode.c b/tools/objtool/arch/loongarch/decode.c
index cc74ba4e0f54..ff0b53144d12 100644
--- a/tools/objtool/arch/loongarch/decode.c
+++ b/tools/objtool/arch/loongarch/decode.c
@@ -1,6 +1,12 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <string.h>
#include <objtool/check.h>
+#include <objtool/warn.h>
+#include <asm/inst.h>
+
+#ifndef EM_LOONGARCH
+#define EM_LOONGARCH 258
+#endif
int arch_ftrace_match(char *name)
{
@@ -39,21 +45,284 @@ int arch_decode_hint_reg(u8 sp_reg, int *base)
return 0;
}
+static bool is_loongarch(const struct elf *elf)
+{
+ if (elf->ehdr.e_machine == EM_LOONGARCH)
+ return true;
+
+ WARN("unexpected ELF machine type %d", elf->ehdr.e_machine);
+ return false;
+}
+
+#define ADD_OP(op) \
+ if (!(op = calloc(1, sizeof(*op)))) \
+ return -1; \
+ else for (*ops_list = op, ops_list = &op->next; op; op = NULL)
+
+static bool decode_insn_reg0i26_fomat(union loongarch_instruction inst,
+ struct instruction *insn)
+{
+ switch (inst.reg0i26_format.opcode) {
+ case b_op:
+ insn->type = INSN_JUMP_UNCONDITIONAL;
+ insn->immediate = sign_extend64(inst.reg0i26_format.immediate_h << 16 |
+ inst.reg0i26_format.immediate_l, 25);
+ break;
+ case bl_op:
+ insn->type = INSN_CALL;
+ insn->immediate = sign_extend64(inst.reg0i26_format.immediate_h << 16 |
+ inst.reg0i26_format.immediate_l, 25);
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+static bool decode_insn_reg1i21_fomat(union loongarch_instruction inst,
+ struct instruction *insn)
+{
+ switch (inst.reg1i21_format.opcode) {
+ case beqz_op:
+ case bnez_op:
+ case bceqz_op:
+ insn->type = INSN_JUMP_CONDITIONAL;
+ insn->immediate = sign_extend64(inst.reg1i21_format.immediate_h << 16 |
+ inst.reg1i21_format.immediate_l, 20);
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+static bool decode_insn_reg2i12_fomat(union loongarch_instruction inst,
+ struct instruction *insn,
+ struct stack_op **ops_list,
+ struct stack_op *op)
+{
+ switch (inst.reg2i12_format.opcode) {
+ case addid_op:
+ if ((inst.reg2i12_format.rd == CFI_SP) || (inst.reg2i12_format.rj == CFI_SP)) {
+ /* addi.d sp,sp,si12 or addi.d fp,sp,si12 */
+ insn->immediate = sign_extend64(inst.reg2i12_format.immediate, 11);
+ ADD_OP(op) {
+ op->src.type = OP_SRC_ADD;
+ op->src.reg = inst.reg2i12_format.rj;
+ op->src.offset = insn->immediate;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = inst.reg2i12_format.rd;
+ }
+ }
+ break;
+ case ldd_op:
+ if (inst.reg2i12_format.rj == CFI_SP) {
+ /* ld.d rd,sp,si12 */
+ insn->immediate = sign_extend64(inst.reg2i12_format.immediate, 11);
+ ADD_OP(op) {
+ op->src.type = OP_SRC_REG_INDIRECT;
+ op->src.reg = CFI_SP;
+ op->src.offset = insn->immediate;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = inst.reg2i12_format.rd;
+ }
+ }
+ break;
+ case std_op:
+ if (inst.reg2i12_format.rj == CFI_SP) {
+ /* st.d rd,sp,si12 */
+ insn->immediate = sign_extend64(inst.reg2i12_format.immediate, 11);
+ ADD_OP(op) {
+ op->src.type = OP_SRC_REG;
+ op->src.reg = inst.reg2i12_format.rd;
+ op->dest.type = OP_DEST_REG_INDIRECT;
+ op->dest.reg = CFI_SP;
+ op->dest.offset = insn->immediate;
+ }
+ }
+ break;
+ case andi_op:
+ if (inst.reg2i12_format.rd == 0 &&
+ inst.reg2i12_format.rj == 0 &&
+ inst.reg2i12_format.immediate == 0)
+ /* andi r0,r0,0 */
+ insn->type = INSN_NOP;
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+static bool decode_insn_reg2i14_fomat(union loongarch_instruction inst,
+ struct instruction *insn,
+ struct stack_op **ops_list,
+ struct stack_op *op)
+{
+ switch (inst.reg2i14_format.opcode) {
+ case ldptrd_op:
+ if (inst.reg2i14_format.rj == CFI_SP) {
+ /* ldptr.d rd,sp,si14 */
+ insn->immediate = sign_extend64(inst.reg2i14_format.immediate, 13);
+ ADD_OP(op) {
+ op->src.type = OP_SRC_REG_INDIRECT;
+ op->src.reg = CFI_SP;
+ op->src.offset = insn->immediate;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = inst.reg2i14_format.rd;
+ }
+ }
+ break;
+ case stptrd_op:
+ if (inst.reg2i14_format.rj == CFI_SP) {
+ /* stptr.d ra,sp,0 */
+ if (inst.reg2i14_format.rd == LOONGARCH_GPR_RA &&
+ inst.reg2i14_format.immediate == 0)
+ break;
+
+ /* stptr.d rd,sp,si14 */
+ insn->immediate = sign_extend64(inst.reg2i14_format.immediate, 13);
+ ADD_OP(op) {
+ op->src.type = OP_SRC_REG;
+ op->src.reg = inst.reg2i14_format.rd;
+ op->dest.type = OP_DEST_REG_INDIRECT;
+ op->dest.reg = CFI_SP;
+ op->dest.offset = insn->immediate;
+ }
+ }
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+static bool decode_insn_reg2i16_fomat(union loongarch_instruction inst,
+ struct instruction *insn)
+{
+ switch (inst.reg2i16_format.opcode) {
+ case jirl_op:
+ if (inst.reg2i16_format.rd == 0 &&
+ inst.reg2i16_format.rj == CFI_RA &&
+ inst.reg2i16_format.immediate == 0) {
+ /* jirl r0,ra,0 */
+ insn->type = INSN_RETURN;
+ } else if (inst.reg2i16_format.rd == CFI_RA) {
+ /* jirl ra,rj,offs16 */
+ insn->type = INSN_CALL_DYNAMIC;
+ } else if (inst.reg2i16_format.rd == CFI_A0 &&
+ inst.reg2i16_format.immediate == 0) {
+ /*
+ * jirl a0,t0,0
+ * this is a special case in loongarch_suspend_enter,
+ * just treat it as a call instruction.
+ */
+ insn->type = INSN_CALL_DYNAMIC;
+ } else if (inst.reg2i16_format.rd == 0 &&
+ inst.reg2i16_format.immediate == 0) {
+ /* jirl r0,rj,0 */
+ insn->type = INSN_JUMP_DYNAMIC;
+ } else if (inst.reg2i16_format.rd == 0 &&
+ inst.reg2i16_format.immediate != 0) {
+ /*
+ * jirl r0,t0,12
+ * this is a rare case in JUMP_VIRT_ADDR,
+ * just ignore it due to it is harmless for tracing.
+ */
+ break;
+ } else {
+ /* jirl rd,rj,offs16 */
+ insn->type = INSN_JUMP_UNCONDITIONAL;
+ insn->immediate = sign_extend64(inst.reg2i16_format.immediate, 15);
+ }
+ break;
+ case beq_op:
+ case bne_op:
+ case blt_op:
+ case bge_op:
+ case bltu_op:
+ case bgeu_op:
+ insn->type = INSN_JUMP_CONDITIONAL;
+ insn->immediate = sign_extend64(inst.reg2i16_format.immediate, 15);
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+
int arch_decode_instruction(struct objtool_file *file, const struct section *sec,
unsigned long offset, unsigned int maxlen,
struct instruction *insn)
{
+ struct stack_op **ops_list = &insn->stack_ops;
+ const struct elf *elf = file->elf;
+ struct stack_op *op = NULL;
+ union loongarch_instruction inst;
+
+ if (!is_loongarch(elf))
+ return -1;
+
+ if (maxlen < LOONGARCH_INSN_SIZE)
+ return 0;
+
+ insn->len = LOONGARCH_INSN_SIZE;
+ insn->type = INSN_OTHER;
+ insn->immediate = 0;
+
+ inst = *(union loongarch_instruction *)(sec->data->d_buf + offset);
+
+ if (decode_insn_reg0i26_fomat(inst, insn))
+ return 0;
+ if (decode_insn_reg1i21_fomat(inst, insn))
+ return 0;
+ if (decode_insn_reg2i12_fomat(inst, insn, ops_list, op))
+ return 0;
+ if (decode_insn_reg2i14_fomat(inst, insn, ops_list, op))
+ return 0;
+ if (decode_insn_reg2i16_fomat(inst, insn))
+ return 0;
+
+ if (inst.word == 0)
+ insn->type = INSN_NOP;
+ else if (inst.reg0i15_format.opcode == break_op) {
+ /* break */
+ insn->type = INSN_BUG;
+ } else if (inst.reg2_format.opcode == ertn_op) {
+ /* ertn */
+ insn->type = INSN_RETURN;
+ }
+
return 0;
}
const char *arch_nop_insn(int len)
{
- return NULL;
+ static u32 nop;
+
+ if (len != LOONGARCH_INSN_SIZE)
+ WARN("invalid NOP size: %d\n", len);
+
+ nop = LOONGARCH_INSN_NOP;
+
+ return (const char *)&nop;
}
const char *arch_ret_insn(int len)
{
- return NULL;
+ static u32 ret;
+
+ if (len != LOONGARCH_INSN_SIZE)
+ WARN("invalid RET size: %d\n", len);
+
+ emit_jirl((union loongarch_instruction *)&ret, LOONGARCH_GPR_RA, LOONGARCH_GPR_ZERO, 0);
+
+ return (const char *)&ret;
}
void arch_initial_func_cfi_state(struct cfi_init_state *state)
--
2.42.0
Move init_orc_entry(), write_orc_entry(), reg_name(), orc_type_name()
and print_reg() from generic orc_gen.c and orc_dump.c to arch-specific
orc.c, then introduce a new function orc_print_dump() to print info.
This is preparation for later patch, no functionality change.
Co-developed-by: Jinyang He <[email protected]>
Signed-off-by: Jinyang He <[email protected]>
Co-developed-by: Youling Tang <[email protected]>
Signed-off-by: Youling Tang <[email protected]>
Signed-off-by: Tiezhu Yang <[email protected]>
---
tools/objtool/arch/x86/Build | 1 +
tools/objtool/arch/x86/orc.c | 188 ++++++++++++++++++++++++++++
tools/objtool/include/objtool/orc.h | 14 +++
tools/objtool/orc_dump.c | 69 +---------
tools/objtool/orc_gen.c | 113 +----------------
5 files changed, 206 insertions(+), 179 deletions(-)
create mode 100644 tools/objtool/arch/x86/orc.c
create mode 100644 tools/objtool/include/objtool/orc.h
diff --git a/tools/objtool/arch/x86/Build b/tools/objtool/arch/x86/Build
index 9f7869b5c5e0..3dedb2fd8f3a 100644
--- a/tools/objtool/arch/x86/Build
+++ b/tools/objtool/arch/x86/Build
@@ -1,5 +1,6 @@
objtool-y += special.o
objtool-y += decode.o
+objtool-y += orc.o
inat_tables_script = ../arch/x86/tools/gen-insn-attr-x86.awk
inat_tables_maps = ../arch/x86/lib/x86-opcode-map.txt
diff --git a/tools/objtool/arch/x86/orc.c b/tools/objtool/arch/x86/orc.c
new file mode 100644
index 000000000000..b6cd943e87f9
--- /dev/null
+++ b/tools/objtool/arch/x86/orc.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <linux/objtool_types.h>
+#include <asm/orc_types.h>
+
+#include <objtool/check.h>
+#include <objtool/orc.h>
+#include <objtool/warn.h>
+#include <objtool/endianness.h>
+
+int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, struct instruction *insn)
+{
+ struct cfi_reg *bp = &cfi->regs[CFI_BP];
+
+ memset(orc, 0, sizeof(*orc));
+
+ if (!cfi) {
+ /*
+ * This is usually either unreachable nops/traps (which don't
+ * trigger unreachable instruction warnings), or
+ * STACK_FRAME_NON_STANDARD functions.
+ */
+ orc->type = ORC_TYPE_UNDEFINED;
+ return 0;
+ }
+
+ switch (cfi->type) {
+ case UNWIND_HINT_TYPE_UNDEFINED:
+ orc->type = ORC_TYPE_UNDEFINED;
+ return 0;
+ case UNWIND_HINT_TYPE_END_OF_STACK:
+ orc->type = ORC_TYPE_END_OF_STACK;
+ return 0;
+ case UNWIND_HINT_TYPE_CALL:
+ orc->type = ORC_TYPE_CALL;
+ break;
+ case UNWIND_HINT_TYPE_REGS:
+ orc->type = ORC_TYPE_REGS;
+ break;
+ case UNWIND_HINT_TYPE_REGS_PARTIAL:
+ orc->type = ORC_TYPE_REGS_PARTIAL;
+ break;
+ default:
+ WARN_INSN(insn, "unknown unwind hint type %d", cfi->type);
+ return -1;
+ }
+
+ orc->signal = cfi->signal;
+
+ switch (cfi->cfa.base) {
+ case CFI_SP:
+ orc->sp_reg = ORC_REG_SP;
+ break;
+ case CFI_SP_INDIRECT:
+ orc->sp_reg = ORC_REG_SP_INDIRECT;
+ break;
+ case CFI_BP:
+ orc->sp_reg = ORC_REG_BP;
+ break;
+ case CFI_BP_INDIRECT:
+ orc->sp_reg = ORC_REG_BP_INDIRECT;
+ break;
+ case CFI_R10:
+ orc->sp_reg = ORC_REG_R10;
+ break;
+ case CFI_R13:
+ orc->sp_reg = ORC_REG_R13;
+ break;
+ case CFI_DI:
+ orc->sp_reg = ORC_REG_DI;
+ break;
+ case CFI_DX:
+ orc->sp_reg = ORC_REG_DX;
+ break;
+ default:
+ WARN_INSN(insn, "unknown CFA base reg %d", cfi->cfa.base);
+ return -1;
+ }
+
+ switch (bp->base) {
+ case CFI_UNDEFINED:
+ orc->bp_reg = ORC_REG_UNDEFINED;
+ break;
+ case CFI_CFA:
+ orc->bp_reg = ORC_REG_PREV_SP;
+ break;
+ case CFI_BP:
+ orc->bp_reg = ORC_REG_BP;
+ break;
+ default:
+ WARN_INSN(insn, "unknown BP base reg %d", bp->base);
+ return -1;
+ }
+
+ orc->sp_offset = cfi->cfa.offset;
+ orc->bp_offset = bp->offset;
+
+ return 0;
+}
+
+int write_orc_entry(struct elf *elf, struct section *orc_sec,
+ struct section *ip_sec, unsigned int idx,
+ struct section *insn_sec, unsigned long insn_off,
+ struct orc_entry *o)
+{
+ struct orc_entry *orc;
+
+ /* populate ORC data */
+ orc = (struct orc_entry *)orc_sec->data->d_buf + idx;
+ memcpy(orc, o, sizeof(*orc));
+ orc->sp_offset = bswap_if_needed(elf, orc->sp_offset);
+ orc->bp_offset = bswap_if_needed(elf, orc->bp_offset);
+
+ /* populate reloc for ip */
+ if (!elf_init_reloc_text_sym(elf, ip_sec, idx * sizeof(int), idx,
+ insn_sec, insn_off))
+ return -1;
+
+ return 0;
+}
+
+static const char *reg_name(unsigned int reg)
+{
+ switch (reg) {
+ case ORC_REG_PREV_SP:
+ return "prevsp";
+ case ORC_REG_DX:
+ return "dx";
+ case ORC_REG_DI:
+ return "di";
+ case ORC_REG_BP:
+ return "bp";
+ case ORC_REG_SP:
+ return "sp";
+ case ORC_REG_R10:
+ return "r10";
+ case ORC_REG_R13:
+ return "r13";
+ case ORC_REG_BP_INDIRECT:
+ return "bp(ind)";
+ case ORC_REG_SP_INDIRECT:
+ return "sp(ind)";
+ default:
+ return "?";
+ }
+}
+
+static const char *orc_type_name(unsigned int type)
+{
+ switch (type) {
+ case ORC_TYPE_UNDEFINED:
+ return "(und)";
+ case ORC_TYPE_END_OF_STACK:
+ return "end";
+ case ORC_TYPE_CALL:
+ return "call";
+ case ORC_TYPE_REGS:
+ return "regs";
+ case ORC_TYPE_REGS_PARTIAL:
+ return "regs (partial)";
+ default:
+ return "?";
+ }
+}
+
+static void print_reg(unsigned int reg, int offset)
+{
+ if (reg == ORC_REG_BP_INDIRECT)
+ printf("(bp%+d)", offset);
+ else if (reg == ORC_REG_SP_INDIRECT)
+ printf("(sp)%+d", offset);
+ else if (reg == ORC_REG_UNDEFINED)
+ printf("(und)");
+ else
+ printf("%s%+d", reg_name(reg), offset);
+}
+
+void orc_print_dump(struct elf *dummy_elf, struct orc_entry *orc, int i)
+{
+ printf("type:%s", orc_type_name(orc[i].type));
+
+ printf(" sp:");
+ print_reg(orc[i].sp_reg, bswap_if_needed(dummy_elf, orc[i].sp_offset));
+
+ printf(" bp:");
+ print_reg(orc[i].bp_reg, bswap_if_needed(dummy_elf, orc[i].bp_offset));
+
+ printf(" signal:%d\n", orc[i].signal);
+}
diff --git a/tools/objtool/include/objtool/orc.h b/tools/objtool/include/objtool/orc.h
new file mode 100644
index 000000000000..15a32def1071
--- /dev/null
+++ b/tools/objtool/include/objtool/orc.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _OBJTOOL_ORC_H
+#define _OBJTOOL_ORC_H
+
+#include <objtool/check.h>
+
+int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, struct instruction *insn);
+void orc_print_dump(struct elf *dummy_elf, struct orc_entry *orc, int i);
+int write_orc_entry(struct elf *elf, struct section *orc_sec,
+ struct section *ip_sec, unsigned int idx,
+ struct section *insn_sec, unsigned long insn_off,
+ struct orc_entry *o);
+
+#endif /* _OBJTOOL_ORC_H */
diff --git a/tools/objtool/orc_dump.c b/tools/objtool/orc_dump.c
index 0e183bb1c720..a62247efb64f 100644
--- a/tools/objtool/orc_dump.c
+++ b/tools/objtool/orc_dump.c
@@ -6,65 +6,10 @@
#include <unistd.h>
#include <asm/orc_types.h>
#include <objtool/objtool.h>
+#include <objtool/orc.h>
#include <objtool/warn.h>
#include <objtool/endianness.h>
-static const char *reg_name(unsigned int reg)
-{
- switch (reg) {
- case ORC_REG_PREV_SP:
- return "prevsp";
- case ORC_REG_DX:
- return "dx";
- case ORC_REG_DI:
- return "di";
- case ORC_REG_BP:
- return "bp";
- case ORC_REG_SP:
- return "sp";
- case ORC_REG_R10:
- return "r10";
- case ORC_REG_R13:
- return "r13";
- case ORC_REG_BP_INDIRECT:
- return "bp(ind)";
- case ORC_REG_SP_INDIRECT:
- return "sp(ind)";
- default:
- return "?";
- }
-}
-
-static const char *orc_type_name(unsigned int type)
-{
- switch (type) {
- case ORC_TYPE_UNDEFINED:
- return "(und)";
- case ORC_TYPE_END_OF_STACK:
- return "end";
- case ORC_TYPE_CALL:
- return "call";
- case ORC_TYPE_REGS:
- return "regs";
- case ORC_TYPE_REGS_PARTIAL:
- return "regs (partial)";
- default:
- return "?";
- }
-}
-
-static void print_reg(unsigned int reg, int offset)
-{
- if (reg == ORC_REG_BP_INDIRECT)
- printf("(bp%+d)", offset);
- else if (reg == ORC_REG_SP_INDIRECT)
- printf("(sp)%+d", offset);
- else if (reg == ORC_REG_UNDEFINED)
- printf("(und)");
- else
- printf("%s%+d", reg_name(reg), offset);
-}
-
int orc_dump(const char *_objname)
{
int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0;
@@ -205,17 +150,7 @@ int orc_dump(const char *_objname)
printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i]));
}
- printf("type:%s", orc_type_name(orc[i].type));
-
- printf(" sp:");
-
- print_reg(orc[i].sp_reg, bswap_if_needed(&dummy_elf, orc[i].sp_offset));
-
- printf(" bp:");
-
- print_reg(orc[i].bp_reg, bswap_if_needed(&dummy_elf, orc[i].bp_offset));
-
- printf(" signal:%d\n", orc[i].signal);
+ orc_print_dump(&dummy_elf, orc, i);
}
elf_end(elf);
diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c
index bae343908867..922e6aac7cea 100644
--- a/tools/objtool/orc_gen.c
+++ b/tools/objtool/orc_gen.c
@@ -10,121 +10,10 @@
#include <asm/orc_types.h>
#include <objtool/check.h>
+#include <objtool/orc.h>
#include <objtool/warn.h>
#include <objtool/endianness.h>
-static int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi,
- struct instruction *insn)
-{
- struct cfi_reg *bp = &cfi->regs[CFI_BP];
-
- memset(orc, 0, sizeof(*orc));
-
- if (!cfi) {
- /*
- * This is usually either unreachable nops/traps (which don't
- * trigger unreachable instruction warnings), or
- * STACK_FRAME_NON_STANDARD functions.
- */
- orc->type = ORC_TYPE_UNDEFINED;
- return 0;
- }
-
- switch (cfi->type) {
- case UNWIND_HINT_TYPE_UNDEFINED:
- orc->type = ORC_TYPE_UNDEFINED;
- return 0;
- case UNWIND_HINT_TYPE_END_OF_STACK:
- orc->type = ORC_TYPE_END_OF_STACK;
- return 0;
- case UNWIND_HINT_TYPE_CALL:
- orc->type = ORC_TYPE_CALL;
- break;
- case UNWIND_HINT_TYPE_REGS:
- orc->type = ORC_TYPE_REGS;
- break;
- case UNWIND_HINT_TYPE_REGS_PARTIAL:
- orc->type = ORC_TYPE_REGS_PARTIAL;
- break;
- default:
- WARN_INSN(insn, "unknown unwind hint type %d", cfi->type);
- return -1;
- }
-
- orc->signal = cfi->signal;
-
- switch (cfi->cfa.base) {
- case CFI_SP:
- orc->sp_reg = ORC_REG_SP;
- break;
- case CFI_SP_INDIRECT:
- orc->sp_reg = ORC_REG_SP_INDIRECT;
- break;
- case CFI_BP:
- orc->sp_reg = ORC_REG_BP;
- break;
- case CFI_BP_INDIRECT:
- orc->sp_reg = ORC_REG_BP_INDIRECT;
- break;
- case CFI_R10:
- orc->sp_reg = ORC_REG_R10;
- break;
- case CFI_R13:
- orc->sp_reg = ORC_REG_R13;
- break;
- case CFI_DI:
- orc->sp_reg = ORC_REG_DI;
- break;
- case CFI_DX:
- orc->sp_reg = ORC_REG_DX;
- break;
- default:
- WARN_INSN(insn, "unknown CFA base reg %d", cfi->cfa.base);
- return -1;
- }
-
- switch (bp->base) {
- case CFI_UNDEFINED:
- orc->bp_reg = ORC_REG_UNDEFINED;
- break;
- case CFI_CFA:
- orc->bp_reg = ORC_REG_PREV_SP;
- break;
- case CFI_BP:
- orc->bp_reg = ORC_REG_BP;
- break;
- default:
- WARN_INSN(insn, "unknown BP base reg %d", bp->base);
- return -1;
- }
-
- orc->sp_offset = cfi->cfa.offset;
- orc->bp_offset = bp->offset;
-
- return 0;
-}
-
-static int write_orc_entry(struct elf *elf, struct section *orc_sec,
- struct section *ip_sec, unsigned int idx,
- struct section *insn_sec, unsigned long insn_off,
- struct orc_entry *o)
-{
- struct orc_entry *orc;
-
- /* populate ORC data */
- orc = (struct orc_entry *)orc_sec->data->d_buf + idx;
- memcpy(orc, o, sizeof(*orc));
- orc->sp_offset = bswap_if_needed(elf, orc->sp_offset);
- orc->bp_offset = bswap_if_needed(elf, orc->bp_offset);
-
- /* populate reloc for ip */
- if (!elf_init_reloc_text_sym(elf, ip_sec, idx * sizeof(int), idx,
- insn_sec, insn_off))
- return -1;
-
- return 0;
-}
-
struct orc_list_entry {
struct list_head list;
struct orc_entry orc;
--
2.42.0
Implement arch-specific init_orc_entry(), write_orc_entry(), reg_name(),
orc_type_name(), print_reg() and orc_print_dump(), then set BUILD_ORC as
y to build the orc related files.
Co-developed-by: Jinyang He <[email protected]>
Signed-off-by: Jinyang He <[email protected]>
Co-developed-by: Youling Tang <[email protected]>
Signed-off-by: Youling Tang <[email protected]>
Signed-off-by: Tiezhu Yang <[email protected]>
---
tools/arch/loongarch/include/asm/orc_types.h | 58 +++++++
tools/objtool/Makefile | 4 +
tools/objtool/arch/loongarch/Build | 1 +
tools/objtool/arch/loongarch/decode.c | 16 ++
tools/objtool/arch/loongarch/orc.c | 171 +++++++++++++++++++
5 files changed, 250 insertions(+)
create mode 100644 tools/arch/loongarch/include/asm/orc_types.h
create mode 100644 tools/objtool/arch/loongarch/orc.c
diff --git a/tools/arch/loongarch/include/asm/orc_types.h b/tools/arch/loongarch/include/asm/orc_types.h
new file mode 100644
index 000000000000..caf1f71a1057
--- /dev/null
+++ b/tools/arch/loongarch/include/asm/orc_types.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _ORC_TYPES_H
+#define _ORC_TYPES_H
+
+#include <linux/types.h>
+
+/*
+ * The ORC_REG_* registers are base registers which are used to find other
+ * registers on the stack.
+ *
+ * ORC_REG_PREV_SP, also known as DWARF Call Frame Address (CFA), is the
+ * address of the previous frame: the caller's SP before it called the current
+ * function.
+ *
+ * ORC_REG_UNDEFINED means the corresponding register's value didn't change in
+ * the current frame.
+ *
+ * The most commonly used base registers are SP and FP -- which the previous SP
+ * is usually based on -- and PREV_SP and UNDEFINED -- which the previous FP is
+ * usually based on.
+ *
+ * The rest of the base registers are needed for special cases like entry code
+ * and GCC realigned stacks.
+ */
+#define ORC_REG_UNDEFINED 0
+#define ORC_REG_PREV_SP 1
+#define ORC_REG_SP 2
+#define ORC_REG_FP 3
+#define ORC_REG_MAX 4
+
+#define ORC_TYPE_UNDEFINED 0
+#define ORC_TYPE_END_OF_STACK 1
+#define ORC_TYPE_CALL 2
+#define ORC_TYPE_REGS 3
+#define ORC_TYPE_REGS_PARTIAL 4
+
+#ifndef __ASSEMBLY__
+/*
+ * This struct is more or less a vastly simplified version of the DWARF Call
+ * Frame Information standard. It contains only the necessary parts of DWARF
+ * CFI, simplified for ease of access by the in-kernel unwinder. It tells the
+ * unwinder how to find the previous SP and FP (and sometimes entry regs) on
+ * the stack for a given code address. Each instance of the struct corresponds
+ * to one or more code locations.
+ */
+struct orc_entry {
+ s16 sp_offset;
+ s16 fp_offset;
+ s16 ra_offset;
+ unsigned int sp_reg:4;
+ unsigned int fp_reg:4;
+ unsigned int ra_reg:4;
+ unsigned int type:3;
+ unsigned int signal:1;
+};
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ORC_TYPES_H */
diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 83b100c1e7f6..bf7f7f84ac62 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -57,6 +57,10 @@ ifeq ($(SRCARCH),x86)
BUILD_ORC := y
endif
+ifeq ($(SRCARCH),loongarch)
+ BUILD_ORC := y
+endif
+
export BUILD_ORC
export srctree OUTPUT CFLAGS SRCARCH AWK
include $(srctree)/tools/build/Makefile.include
diff --git a/tools/objtool/arch/loongarch/Build b/tools/objtool/arch/loongarch/Build
index d24d5636a5b8..1d4b784b6887 100644
--- a/tools/objtool/arch/loongarch/Build
+++ b/tools/objtool/arch/loongarch/Build
@@ -1,2 +1,3 @@
objtool-y += decode.o
objtool-y += special.o
+objtool-y += orc.o
diff --git a/tools/objtool/arch/loongarch/decode.c b/tools/objtool/arch/loongarch/decode.c
index ff0b53144d12..aee479d2191c 100644
--- a/tools/objtool/arch/loongarch/decode.c
+++ b/tools/objtool/arch/loongarch/decode.c
@@ -3,6 +3,8 @@
#include <objtool/check.h>
#include <objtool/warn.h>
#include <asm/inst.h>
+#include <asm/orc_types.h>
+#include <linux/objtool_types.h>
#ifndef EM_LOONGARCH
#define EM_LOONGARCH 258
@@ -42,6 +44,20 @@ bool arch_callee_saved_reg(unsigned char reg)
int arch_decode_hint_reg(u8 sp_reg, int *base)
{
+ switch (sp_reg) {
+ case ORC_REG_UNDEFINED:
+ *base = CFI_UNDEFINED;
+ break;
+ case ORC_REG_SP:
+ *base = CFI_SP;
+ break;
+ case ORC_REG_FP:
+ *base = CFI_FP;
+ break;
+ default:
+ return -1;
+ }
+
return 0;
}
diff --git a/tools/objtool/arch/loongarch/orc.c b/tools/objtool/arch/loongarch/orc.c
new file mode 100644
index 000000000000..873536d009d9
--- /dev/null
+++ b/tools/objtool/arch/loongarch/orc.c
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <linux/objtool_types.h>
+#include <asm/orc_types.h>
+
+#include <objtool/check.h>
+#include <objtool/orc.h>
+#include <objtool/warn.h>
+#include <objtool/endianness.h>
+
+int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, struct instruction *insn)
+{
+ struct cfi_reg *fp = &cfi->regs[CFI_FP];
+ struct cfi_reg *ra = &cfi->regs[CFI_RA];
+
+ memset(orc, 0, sizeof(*orc));
+
+ if (!cfi) {
+ /*
+ * This is usually either unreachable nops/traps (which don't
+ * trigger unreachable instruction warnings), or
+ * STACK_FRAME_NON_STANDARD functions.
+ */
+ orc->type = ORC_TYPE_UNDEFINED;
+ return 0;
+ }
+
+ switch (cfi->type) {
+ case UNWIND_HINT_TYPE_UNDEFINED:
+ orc->type = ORC_TYPE_UNDEFINED;
+ return 0;
+ case UNWIND_HINT_TYPE_END_OF_STACK:
+ orc->type = ORC_TYPE_END_OF_STACK;
+ return 0;
+ case UNWIND_HINT_TYPE_CALL:
+ orc->type = ORC_TYPE_CALL;
+ break;
+ case UNWIND_HINT_TYPE_REGS:
+ orc->type = ORC_TYPE_REGS;
+ break;
+ case UNWIND_HINT_TYPE_REGS_PARTIAL:
+ orc->type = ORC_TYPE_REGS_PARTIAL;
+ break;
+ default:
+ WARN_INSN(insn, "unknown unwind hint type %d", cfi->type);
+ return -1;
+ }
+
+ orc->signal = cfi->signal;
+
+ switch (cfi->cfa.base) {
+ case CFI_SP:
+ orc->sp_reg = ORC_REG_SP;
+ break;
+ case CFI_FP:
+ orc->sp_reg = ORC_REG_FP;
+ break;
+ default:
+ WARN_INSN(insn, "unknown CFA base reg %d", cfi->cfa.base);
+ return -1;
+ }
+
+ switch (fp->base) {
+ case CFI_UNDEFINED:
+ orc->fp_reg = ORC_REG_UNDEFINED;
+ orc->fp_offset = 0;
+ break;
+ case CFI_CFA:
+ orc->fp_reg = ORC_REG_PREV_SP;
+ orc->fp_offset = fp->offset;
+ break;
+ case CFI_FP:
+ orc->fp_reg = ORC_REG_FP;
+ break;
+ default:
+ WARN_INSN(insn, "unknown FP base reg %d", fp->base);
+ return -1;
+ }
+
+ switch (ra->base) {
+ case CFI_UNDEFINED:
+ orc->ra_reg = ORC_REG_UNDEFINED;
+ orc->ra_offset = 0;
+ break;
+ case CFI_CFA:
+ orc->ra_reg = ORC_REG_PREV_SP;
+ orc->ra_offset = ra->offset;
+ break;
+ case CFI_FP:
+ orc->ra_reg = ORC_REG_FP;
+ break;
+ default:
+ WARN_INSN(insn, "unknown RA base reg %d", ra->base);
+ return -1;
+ }
+
+ orc->sp_offset = cfi->cfa.offset;
+
+ return 0;
+}
+
+int write_orc_entry(struct elf *elf, struct section *orc_sec,
+ struct section *ip_sec, unsigned int idx,
+ struct section *insn_sec, unsigned long insn_off,
+ struct orc_entry *o)
+{
+ struct orc_entry *orc;
+
+ /* populate ORC data */
+ orc = (struct orc_entry *)orc_sec->data->d_buf + idx;
+ memcpy(orc, o, sizeof(*orc));
+
+ /* populate reloc for ip */
+ if (!elf_init_reloc_text_sym(elf, ip_sec, idx * sizeof(int), idx,
+ insn_sec, insn_off))
+ return -1;
+
+ return 0;
+}
+
+static const char *reg_name(unsigned int reg)
+{
+ switch (reg) {
+ case ORC_REG_SP:
+ return "sp";
+ case ORC_REG_FP:
+ return "fp";
+ case ORC_REG_PREV_SP:
+ return "prevsp";
+ default:
+ return "?";
+ }
+}
+
+static const char *orc_type_name(unsigned int type)
+{
+ switch (type) {
+ case UNWIND_HINT_TYPE_CALL:
+ return "call";
+ case UNWIND_HINT_TYPE_REGS:
+ return "regs";
+ case UNWIND_HINT_TYPE_REGS_PARTIAL:
+ return "regs (partial)";
+ default:
+ return "?";
+ }
+}
+
+static void print_reg(unsigned int reg, int offset)
+{
+ if (reg == ORC_REG_UNDEFINED)
+ printf(" (und) ");
+ else
+ printf("%s + %3d", reg_name(reg), offset);
+
+}
+
+void orc_print_dump(struct elf *dummy_elf, struct orc_entry *orc, int i)
+{
+ printf("type:%s", orc_type_name(orc[i].type));
+
+ printf(" sp:");
+ print_reg(orc[i].sp_reg, orc[i].sp_offset);
+
+ printf(" fp:");
+ print_reg(orc[i].fp_reg, orc[i].fp_offset);
+
+ printf(" ra:");
+ print_reg(orc[i].ra_reg, orc[i].ra_offset);
+
+ printf(" signal:%d\n", orc[i].signal);
+}
--
2.42.0
Add the minimal changes to enable objtool build on LoongArch,
most of the functions are stubs to only fix the build errors
when make -C tools/objtool.
This is similar with commit e52ec98c5ab1 ("objtool/powerpc:
Enable objtool to be built on ppc").
Co-developed-by: Jinyang He <[email protected]>
Signed-off-by: Jinyang He <[email protected]>
Co-developed-by: Youling Tang <[email protected]>
Signed-off-by: Youling Tang <[email protected]>
Signed-off-by: Tiezhu Yang <[email protected]>
---
tools/objtool/arch/loongarch/Build | 2 +
tools/objtool/arch/loongarch/decode.c | 71 +++++++++++++++++++
.../arch/loongarch/include/arch/cfi_regs.h | 22 ++++++
.../objtool/arch/loongarch/include/arch/elf.h | 30 ++++++++
.../arch/loongarch/include/arch/special.h | 33 +++++++++
tools/objtool/arch/loongarch/special.c | 15 ++++
6 files changed, 173 insertions(+)
create mode 100644 tools/objtool/arch/loongarch/Build
create mode 100644 tools/objtool/arch/loongarch/decode.c
create mode 100644 tools/objtool/arch/loongarch/include/arch/cfi_regs.h
create mode 100644 tools/objtool/arch/loongarch/include/arch/elf.h
create mode 100644 tools/objtool/arch/loongarch/include/arch/special.h
create mode 100644 tools/objtool/arch/loongarch/special.c
diff --git a/tools/objtool/arch/loongarch/Build b/tools/objtool/arch/loongarch/Build
new file mode 100644
index 000000000000..d24d5636a5b8
--- /dev/null
+++ b/tools/objtool/arch/loongarch/Build
@@ -0,0 +1,2 @@
+objtool-y += decode.o
+objtool-y += special.o
diff --git a/tools/objtool/arch/loongarch/decode.c b/tools/objtool/arch/loongarch/decode.c
new file mode 100644
index 000000000000..cc74ba4e0f54
--- /dev/null
+++ b/tools/objtool/arch/loongarch/decode.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <string.h>
+#include <objtool/check.h>
+
+int arch_ftrace_match(char *name)
+{
+ return !strcmp(name, "_mcount");
+}
+
+unsigned long arch_jump_destination(struct instruction *insn)
+{
+ return insn->offset + (insn->immediate << 2);
+}
+
+unsigned long arch_dest_reloc_offset(int addend)
+{
+ return addend;
+}
+
+bool arch_pc_relative_reloc(struct reloc *reloc)
+{
+ return false;
+}
+
+bool arch_callee_saved_reg(unsigned char reg)
+{
+ switch (reg) {
+ case CFI_RA:
+ case CFI_FP:
+ case CFI_S0 ... CFI_S8:
+ return true;
+ default:
+ return false;
+ }
+}
+
+int arch_decode_hint_reg(u8 sp_reg, int *base)
+{
+ return 0;
+}
+
+int arch_decode_instruction(struct objtool_file *file, const struct section *sec,
+ unsigned long offset, unsigned int maxlen,
+ struct instruction *insn)
+{
+ return 0;
+}
+
+const char *arch_nop_insn(int len)
+{
+ return NULL;
+}
+
+const char *arch_ret_insn(int len)
+{
+ return NULL;
+}
+
+void arch_initial_func_cfi_state(struct cfi_init_state *state)
+{
+ int i;
+
+ for (i = 0; i < CFI_NUM_REGS; i++) {
+ state->regs[i].base = CFI_UNDEFINED;
+ state->regs[i].offset = 0;
+ }
+
+ /* initial CFA (call frame address) */
+ state->cfa.base = CFI_SP;
+ state->cfa.offset = 0;
+}
diff --git a/tools/objtool/arch/loongarch/include/arch/cfi_regs.h b/tools/objtool/arch/loongarch/include/arch/cfi_regs.h
new file mode 100644
index 000000000000..d183cc8f43bf
--- /dev/null
+++ b/tools/objtool/arch/loongarch/include/arch/cfi_regs.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _OBJTOOL_ARCH_CFI_REGS_H
+#define _OBJTOOL_ARCH_CFI_REGS_H
+
+#define CFI_RA 1
+#define CFI_SP 3
+#define CFI_A0 4
+#define CFI_FP 22
+#define CFI_S0 23
+#define CFI_S1 24
+#define CFI_S2 25
+#define CFI_S3 26
+#define CFI_S4 27
+#define CFI_S5 28
+#define CFI_S6 29
+#define CFI_S7 30
+#define CFI_S8 31
+#define CFI_NUM_REGS 32
+
+#define CFI_BP CFI_FP
+
+#endif /* _OBJTOOL_ARCH_CFI_REGS_H */
diff --git a/tools/objtool/arch/loongarch/include/arch/elf.h b/tools/objtool/arch/loongarch/include/arch/elf.h
new file mode 100644
index 000000000000..9623d663220e
--- /dev/null
+++ b/tools/objtool/arch/loongarch/include/arch/elf.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _OBJTOOL_ARCH_ELF_H
+#define _OBJTOOL_ARCH_ELF_H
+
+/*
+ * See the following link for more info about ELF Relocation types:
+ * https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_relocations
+ */
+#ifndef R_LARCH_NONE
+#define R_LARCH_NONE 0
+#endif
+#ifndef R_LARCH_32
+#define R_LARCH_32 1
+#endif
+#ifndef R_LARCH_64
+#define R_LARCH_64 2
+#endif
+#ifndef R_LARCH_32_PCREL
+#define R_LARCH_32_PCREL 99
+#endif
+
+#define R_NONE R_LARCH_NONE
+#define R_ABS32 R_LARCH_32
+#define R_ABS64 R_LARCH_64
+#define R_DATA32 R_LARCH_32_PCREL
+#define R_DATA64 R_LARCH_32_PCREL
+#define R_TEXT32 R_LARCH_32_PCREL
+#define R_TEXT64 R_LARCH_32_PCREL
+
+#endif /* _OBJTOOL_ARCH_ELF_H */
diff --git a/tools/objtool/arch/loongarch/include/arch/special.h b/tools/objtool/arch/loongarch/include/arch/special.h
new file mode 100644
index 000000000000..35fc979b550a
--- /dev/null
+++ b/tools/objtool/arch/loongarch/include/arch/special.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _OBJTOOL_ARCH_SPECIAL_H
+#define _OBJTOOL_ARCH_SPECIAL_H
+
+/*
+ * See more info about struct exception_table_entry
+ * in arch/loongarch/include/asm/extable.h
+ */
+#define EX_ENTRY_SIZE 12
+#define EX_ORIG_OFFSET 0
+#define EX_NEW_OFFSET 4
+
+/*
+ * See more info about struct jump_entry
+ * in include/linux/jump_label.h
+ */
+#define JUMP_ENTRY_SIZE 16
+#define JUMP_ORIG_OFFSET 0
+#define JUMP_NEW_OFFSET 4
+#define JUMP_KEY_OFFSET 8
+
+/*
+ * See more info about struct alt_instr
+ * in arch/loongarch/include/asm/alternative.h
+ */
+#define ALT_ENTRY_SIZE 12
+#define ALT_ORIG_OFFSET 0
+#define ALT_NEW_OFFSET 4
+#define ALT_FEATURE_OFFSET 8
+#define ALT_ORIG_LEN_OFFSET 10
+#define ALT_NEW_LEN_OFFSET 11
+
+#endif /* _OBJTOOL_ARCH_SPECIAL_H */
diff --git a/tools/objtool/arch/loongarch/special.c b/tools/objtool/arch/loongarch/special.c
new file mode 100644
index 000000000000..9bba1e9318e0
--- /dev/null
+++ b/tools/objtool/arch/loongarch/special.c
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <objtool/special.h>
+
+bool arch_support_alt_relocation(struct special_alt *special_alt,
+ struct instruction *insn,
+ struct reloc *reloc)
+{
+ return false;
+}
+
+struct reloc *arch_find_switch_table(struct objtool_file *file,
+ struct instruction *insn)
+{
+ return NULL;
+}
--
2.42.0
The arch-specified function ftrace_regs_set_instruction_pointer() has been
implemented in arch/loongarch/include/asm/ftrace.h, so here only implement
arch_stack_walk_reliable() function.
Here are the test logs:
[root@linux fedora]# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-6.8.0-rc2 root=/dev/sda3
[root@linux fedora]# modprobe livepatch-sample
[root@linux fedora]# cat /proc/cmdline
this has been live patched
[root@linux fedora]# echo 0 > /sys/kernel/livepatch/livepatch_sample/enabled
[root@linux fedora]# rmmod livepatch_sample
[root@linux fedora]# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-6.8.0-rc2 root=/dev/sda3
[root@linux fedora]# dmesg -t | tail -5
livepatch: enabling patch 'livepatch_sample'
livepatch: 'livepatch_sample': starting patching transition
livepatch: 'livepatch_sample': patching complete
livepatch: 'livepatch_sample': starting unpatching transition
livepatch: 'livepatch_sample': unpatching complete
Co-developed-by: Jinyang He <[email protected]>
Signed-off-by: Jinyang He <[email protected]>
Signed-off-by: Tiezhu Yang <[email protected]>
---
arch/loongarch/Kconfig | 4 +++
arch/loongarch/include/asm/thread_info.h | 2 ++
arch/loongarch/kernel/stacktrace.c | 41 ++++++++++++++++++++++++
3 files changed, 47 insertions(+)
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 17be0bff0f40..ecdc685daeea 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -132,6 +132,7 @@ config LOONGARCH
select HAVE_KPROBES_ON_FTRACE
select HAVE_KRETPROBES
select HAVE_KVM
+ select HAVE_LIVEPATCH
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI
select HAVE_OBJTOOL if AS_HAS_EXPLICIT_RELOCS
@@ -141,6 +142,7 @@ config LOONGARCH
select HAVE_PERF_USER_STACK_DUMP
select HAVE_PREEMPT_DYNAMIC_KEY
select HAVE_REGS_AND_STACK_ACCESS_API
+ select HAVE_RELIABLE_STACKTRACE if UNWINDER_ORC
select HAVE_RETHOOK
select HAVE_RSEQ
select HAVE_RUST
@@ -695,6 +697,8 @@ config KASAN_SHADOW_OFFSET
default 0x0
depends on KASAN
+source "kernel/livepatch/Kconfig"
+
menu "Power management options"
config ARCH_SUSPEND_POSSIBLE
diff --git a/arch/loongarch/include/asm/thread_info.h b/arch/loongarch/include/asm/thread_info.h
index 8cb653d49a54..8bf0e6f51546 100644
--- a/arch/loongarch/include/asm/thread_info.h
+++ b/arch/loongarch/include/asm/thread_info.h
@@ -86,6 +86,7 @@ register unsigned long current_stack_pointer __asm__("$sp");
#define TIF_LASX_CTX_LIVE 18 /* LASX context must be preserved */
#define TIF_USEDLBT 19 /* LBT was used by this task this quantum (SMP) */
#define TIF_LBT_CTX_LIVE 20 /* LBT context must be preserved */
+#define TIF_PATCH_PENDING 21 /* pending live patching update */
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
@@ -105,6 +106,7 @@ register unsigned long current_stack_pointer __asm__("$sp");
#define _TIF_LASX_CTX_LIVE (1<<TIF_LASX_CTX_LIVE)
#define _TIF_USEDLBT (1<<TIF_USEDLBT)
#define _TIF_LBT_CTX_LIVE (1<<TIF_LBT_CTX_LIVE)
+#define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING)
#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */
diff --git a/arch/loongarch/kernel/stacktrace.c b/arch/loongarch/kernel/stacktrace.c
index eaec82e02c92..8f4b217c9114 100644
--- a/arch/loongarch/kernel/stacktrace.c
+++ b/arch/loongarch/kernel/stacktrace.c
@@ -40,6 +40,47 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
}
}
+int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
+ void *cookie, struct task_struct *task)
+{
+ unsigned long addr;
+ struct pt_regs dummyregs;
+ struct pt_regs *regs = &dummyregs;
+ struct unwind_state state;
+
+ if (task == current) {
+ regs->regs[3] = (unsigned long)__builtin_frame_address(0);
+ regs->csr_era = (unsigned long)__builtin_return_address(0);
+ } else {
+ regs->regs[3] = thread_saved_fp(task);
+ regs->csr_era = thread_saved_ra(task);
+ }
+ regs->regs[1] = 0;
+ regs->regs[22] = 0;
+
+ for (unwind_start(&state, task, regs);
+ !unwind_done(&state) && !unwind_error(&state);
+ unwind_next_frame(&state)) {
+ addr = unwind_get_return_address(&state);
+
+ /*
+ * A NULL or invalid return address probably means there's some
+ * generated code which __kernel_text_address() doesn't know about.
+ */
+ if (!addr)
+ return -EINVAL;
+
+ if (!consume_entry(cookie, addr))
+ return -EINVAL;
+ }
+
+ /* Check for stack corruption */
+ if (unwind_error(&state))
+ return -EINVAL;
+
+ return 0;
+}
+
static int
copy_stack_frame(unsigned long fp, struct stack_frame *frame)
{
--
2.42.0
The kernel CONFIG_UNWINDER_ORC option enables the ORC unwinder, which is
similar in concept to a DWARF unwinder. The difference is that the format
of the ORC data is much simpler than DWARF, which in turn allows the ORC
unwinder to be much simpler and faster.
The ORC data consists of unwind tables which are generated by objtool.
After analyzing all the code paths of a .o file, it determines information
about the stack state at each instruction address in the file and outputs
that information to the .orc_unwind and .orc_unwind_ip sections.
The per-object ORC sections are combined at link time and are sorted and
post-processed at boot time. The unwinder uses the resulting data to
correlate instruction addresses with their stack states at run time.
Most of the logic are similar with x86, in order to get ra info before ra
is saved into stack, add ra_reg and ra_offset into orc_entry. At the same
time, modify some arch-specific code to silence the objtool warnings.
Co-developed-by: Jinyang He <[email protected]>
Signed-off-by: Jinyang He <[email protected]>
Co-developed-by: Youling Tang <[email protected]>
Signed-off-by: Youling Tang <[email protected]>
Signed-off-by: Tiezhu Yang <[email protected]>
---
arch/loongarch/Kconfig | 2 +
arch/loongarch/Kconfig.debug | 11 +
arch/loongarch/Makefile | 23 +-
arch/loongarch/include/asm/Kbuild | 2 +
arch/loongarch/include/asm/bug.h | 1 +
arch/loongarch/include/asm/exception.h | 2 +
arch/loongarch/include/asm/module.h | 7 +
arch/loongarch/include/asm/orc_header.h | 18 +
arch/loongarch/include/asm/orc_lookup.h | 31 ++
arch/loongarch/include/asm/orc_types.h | 58 +++
arch/loongarch/include/asm/stackframe.h | 3 +
arch/loongarch/include/asm/unwind.h | 20 +-
arch/loongarch/include/asm/unwind_hints.h | 28 ++
arch/loongarch/kernel/Makefile | 4 +
arch/loongarch/kernel/entry.S | 5 +
arch/loongarch/kernel/fpu.S | 7 +
arch/loongarch/kernel/genex.S | 6 +
arch/loongarch/kernel/lbt.S | 2 +
arch/loongarch/kernel/mcount_dyn.S | 6 +
arch/loongarch/kernel/module.c | 22 +-
arch/loongarch/kernel/relocate_kernel.S | 8 +-
arch/loongarch/kernel/rethook_trampoline.S | 1 +
arch/loongarch/kernel/setup.c | 2 +
arch/loongarch/kernel/stacktrace.c | 1 +
arch/loongarch/kernel/traps.c | 42 +-
arch/loongarch/kernel/unwind_orc.c | 516 +++++++++++++++++++++
arch/loongarch/kernel/vmlinux.lds.S | 3 +
arch/loongarch/kvm/switch.S | 9 +-
arch/loongarch/lib/clear_user.S | 2 +
arch/loongarch/lib/copy_user.S | 2 +
arch/loongarch/lib/memcpy.S | 2 +
arch/loongarch/lib/memset.S | 2 +
arch/loongarch/mm/tlb.c | 27 +-
arch/loongarch/mm/tlbex.S | 9 +
arch/loongarch/vdso/Makefile | 1 +
include/linux/compiler.h | 9 +
scripts/Makefile | 7 +-
37 files changed, 859 insertions(+), 42 deletions(-)
create mode 100644 arch/loongarch/include/asm/orc_header.h
create mode 100644 arch/loongarch/include/asm/orc_lookup.h
create mode 100644 arch/loongarch/include/asm/orc_types.h
create mode 100644 arch/loongarch/include/asm/unwind_hints.h
create mode 100644 arch/loongarch/kernel/unwind_orc.c
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 10959e6c3583..17be0bff0f40 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -134,6 +134,7 @@ config LOONGARCH
select HAVE_KVM
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI
+ select HAVE_OBJTOOL if AS_HAS_EXPLICIT_RELOCS
select HAVE_PCI
select HAVE_PERF_EVENTS
select HAVE_PERF_REGS
@@ -146,6 +147,7 @@ config LOONGARCH
select HAVE_SAMPLE_FTRACE_DIRECT
select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
select HAVE_SETUP_PER_CPU_AREA if NUMA
+ select HAVE_STACK_VALIDATION if HAVE_OBJTOOL
select HAVE_STACKPROTECTOR
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_TIF_NOHZ
diff --git a/arch/loongarch/Kconfig.debug b/arch/loongarch/Kconfig.debug
index 8d36aab53008..98d60630c3d4 100644
--- a/arch/loongarch/Kconfig.debug
+++ b/arch/loongarch/Kconfig.debug
@@ -26,4 +26,15 @@ config UNWINDER_PROLOGUE
Some of the addresses it reports may be incorrect (but better than the
Guess unwinder).
+config UNWINDER_ORC
+ bool "ORC unwinder"
+ select OBJTOOL
+ help
+ This option enables the ORC (Oops Rewind Capability) unwinder for
+ unwinding kernel stack traces. It uses a custom data format which is
+ a simplified version of the DWARF Call Frame Information standard.
+
+ Enabling this option will increase the kernel's runtime memory usage
+ by roughly 2-4MB, depending on your kernel config.
+
endchoice
diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
index 983aa2b1629a..e3bc02fb7fdc 100644
--- a/arch/loongarch/Makefile
+++ b/arch/loongarch/Makefile
@@ -26,6 +26,18 @@ endif
32bit-emul = elf32loongarch
64bit-emul = elf64loongarch
+ifdef CONFIG_UNWINDER_ORC
+orc_hash_h := arch/$(SRCARCH)/include/generated/asm/orc_hash.h
+orc_hash_sh := $(srctree)/scripts/orc_hash.sh
+targets += $(orc_hash_h)
+quiet_cmd_orc_hash = GEN $@
+ cmd_orc_hash = mkdir -p $(dir $@); \
+ $(CONFIG_SHELL) $(orc_hash_sh) < $< > $@
+$(orc_hash_h): $(srctree)/arch/loongarch/include/asm/orc_types.h $(orc_hash_sh) FORCE
+ $(call if_changed,orc_hash)
+archprepare: $(orc_hash_h)
+endif
+
ifdef CONFIG_DYNAMIC_FTRACE
KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
CC_FLAGS_FTRACE := -fpatchable-function-entry=2
@@ -72,8 +84,6 @@ KBUILD_CFLAGS_KERNEL += $(call cc-option,-mdirect-extern-access)
KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdirect-access-external-data)
KBUILD_AFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data)
KBUILD_CFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data)
-KBUILD_AFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
-KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
else
cflags-y += $(call cc-option,-mno-explicit-relocs)
KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel
@@ -82,6 +92,15 @@ KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs
KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
endif
+KBUILD_AFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
+KBUILD_CFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
+KBUILD_AFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
+KBUILD_CFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
+
+ifdef CONFIG_OBJTOOL
+KBUILD_CFLAGS += -fno-jump-tables
+endif
+
KBUILD_RUSTFLAGS_MODULE += -Crelocation-model=pic
ifeq ($(CONFIG_RELOCATABLE),y)
diff --git a/arch/loongarch/include/asm/Kbuild b/arch/loongarch/include/asm/Kbuild
index 93783fa24f6e..a97c0edbb866 100644
--- a/arch/loongarch/include/asm/Kbuild
+++ b/arch/loongarch/include/asm/Kbuild
@@ -1,4 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
+generated-y += orc_hash.h
+
generic-y += dma-contiguous.h
generic-y += mcs_spinlock.h
generic-y += parport.h
diff --git a/arch/loongarch/include/asm/bug.h b/arch/loongarch/include/asm/bug.h
index d4ca3ba25418..08388876ade4 100644
--- a/arch/loongarch/include/asm/bug.h
+++ b/arch/loongarch/include/asm/bug.h
@@ -44,6 +44,7 @@
do { \
instrumentation_begin(); \
__BUG_FLAGS(BUGFLAG_WARNING|(flags)); \
+ annotate_reachable(); \
instrumentation_end(); \
} while (0)
diff --git a/arch/loongarch/include/asm/exception.h b/arch/loongarch/include/asm/exception.h
index af74a3fdcad1..c6d20736fd92 100644
--- a/arch/loongarch/include/asm/exception.h
+++ b/arch/loongarch/include/asm/exception.h
@@ -6,6 +6,8 @@
#include <asm/ptrace.h>
#include <linux/kprobes.h>
+extern void *exception_table[];
+
void show_registers(struct pt_regs *regs);
asmlinkage void cache_parity_error(void);
diff --git a/arch/loongarch/include/asm/module.h b/arch/loongarch/include/asm/module.h
index 2ecd82bb64e1..f33f3fd32ecc 100644
--- a/arch/loongarch/include/asm/module.h
+++ b/arch/loongarch/include/asm/module.h
@@ -6,6 +6,7 @@
#define _ASM_MODULE_H
#include <asm/inst.h>
+#include <asm/orc_types.h>
#include <asm-generic/module.h>
#define RELA_STACK_DEPTH 16
@@ -21,6 +22,12 @@ struct mod_arch_specific {
struct mod_section plt;
struct mod_section plt_idx;
+#ifdef CONFIG_UNWINDER_ORC
+ unsigned int num_orcs;
+ int *orc_unwind_ip;
+ struct orc_entry *orc_unwind;
+#endif
+
/* For CONFIG_DYNAMIC_FTRACE */
struct plt_entry *ftrace_trampolines;
};
diff --git a/arch/loongarch/include/asm/orc_header.h b/arch/loongarch/include/asm/orc_header.h
new file mode 100644
index 000000000000..f9d509c3fd70
--- /dev/null
+++ b/arch/loongarch/include/asm/orc_header.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef _ORC_HEADER_H
+#define _ORC_HEADER_H
+
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <asm/orc_hash.h>
+
+/*
+ * The header is currently a 20-byte hash of the ORC entry definition; see
+ * scripts/orc_hash.sh.
+ */
+#define ORC_HEADER \
+ __used __section(".orc_header") __aligned(4) \
+ static const u8 orc_header[] = { ORC_HASH }
+
+#endif /* _ORC_HEADER_H */
diff --git a/arch/loongarch/include/asm/orc_lookup.h b/arch/loongarch/include/asm/orc_lookup.h
new file mode 100644
index 000000000000..b02e6357def4
--- /dev/null
+++ b/arch/loongarch/include/asm/orc_lookup.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _ORC_LOOKUP_H
+#define _ORC_LOOKUP_H
+
+/*
+ * This is a lookup table for speeding up access to the .orc_unwind table.
+ * Given an input address offset, the corresponding lookup table entry
+ * specifies a subset of the .orc_unwind table to search.
+ *
+ * Each block represents the end of the previous range and the start of the
+ * next range. An extra block is added to give the last range an end.
+ *
+ * The block size should be a power of 2 to avoid a costly 'div' instruction.
+ *
+ * A block size of 256 was chosen because it roughly doubles unwinder
+ * performance while only adding ~5% to the ORC data footprint.
+ */
+#define LOOKUP_BLOCK_ORDER 8
+#define LOOKUP_BLOCK_SIZE (1 << LOOKUP_BLOCK_ORDER)
+
+#ifndef LINKER_SCRIPT
+
+extern unsigned int orc_lookup[];
+extern unsigned int orc_lookup_end[];
+
+#define LOOKUP_START_IP (unsigned long)_stext
+#define LOOKUP_STOP_IP (unsigned long)_etext
+
+#endif /* LINKER_SCRIPT */
+
+#endif /* _ORC_LOOKUP_H */
diff --git a/arch/loongarch/include/asm/orc_types.h b/arch/loongarch/include/asm/orc_types.h
new file mode 100644
index 000000000000..caf1f71a1057
--- /dev/null
+++ b/arch/loongarch/include/asm/orc_types.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _ORC_TYPES_H
+#define _ORC_TYPES_H
+
+#include <linux/types.h>
+
+/*
+ * The ORC_REG_* registers are base registers which are used to find other
+ * registers on the stack.
+ *
+ * ORC_REG_PREV_SP, also known as DWARF Call Frame Address (CFA), is the
+ * address of the previous frame: the caller's SP before it called the current
+ * function.
+ *
+ * ORC_REG_UNDEFINED means the corresponding register's value didn't change in
+ * the current frame.
+ *
+ * The most commonly used base registers are SP and FP -- which the previous SP
+ * is usually based on -- and PREV_SP and UNDEFINED -- which the previous FP is
+ * usually based on.
+ *
+ * The rest of the base registers are needed for special cases like entry code
+ * and GCC realigned stacks.
+ */
+#define ORC_REG_UNDEFINED 0
+#define ORC_REG_PREV_SP 1
+#define ORC_REG_SP 2
+#define ORC_REG_FP 3
+#define ORC_REG_MAX 4
+
+#define ORC_TYPE_UNDEFINED 0
+#define ORC_TYPE_END_OF_STACK 1
+#define ORC_TYPE_CALL 2
+#define ORC_TYPE_REGS 3
+#define ORC_TYPE_REGS_PARTIAL 4
+
+#ifndef __ASSEMBLY__
+/*
+ * This struct is more or less a vastly simplified version of the DWARF Call
+ * Frame Information standard. It contains only the necessary parts of DWARF
+ * CFI, simplified for ease of access by the in-kernel unwinder. It tells the
+ * unwinder how to find the previous SP and FP (and sometimes entry regs) on
+ * the stack for a given code address. Each instance of the struct corresponds
+ * to one or more code locations.
+ */
+struct orc_entry {
+ s16 sp_offset;
+ s16 fp_offset;
+ s16 ra_offset;
+ unsigned int sp_reg:4;
+ unsigned int fp_reg:4;
+ unsigned int ra_reg:4;
+ unsigned int type:3;
+ unsigned int signal:1;
+};
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ORC_TYPES_H */
diff --git a/arch/loongarch/include/asm/stackframe.h b/arch/loongarch/include/asm/stackframe.h
index 4fb1e6408b98..45b507a7b06f 100644
--- a/arch/loongarch/include/asm/stackframe.h
+++ b/arch/loongarch/include/asm/stackframe.h
@@ -13,6 +13,7 @@
#include <asm/asm-offsets.h>
#include <asm/loongarch.h>
#include <asm/thread_info.h>
+#include <asm/unwind_hints.h>
/* Make the addition of cfi info a little easier. */
.macro cfi_rel_offset reg offset=0 docfi=0
@@ -162,6 +163,7 @@
li.w t0, CSR_CRMD_WE
csrxchg t0, t0, LOONGARCH_CSR_CRMD
#endif
+ UNWIND_HINT_REGS
.endm
.macro SAVE_ALL docfi=0
@@ -219,6 +221,7 @@
.macro RESTORE_SP_AND_RET docfi=0
cfi_ld sp, PT_R3, \docfi
+ UNWIND_HINT_FUNC
ertn
.endm
diff --git a/arch/loongarch/include/asm/unwind.h b/arch/loongarch/include/asm/unwind.h
index b9dce87afd2e..40a6763c5aec 100644
--- a/arch/loongarch/include/asm/unwind.h
+++ b/arch/loongarch/include/asm/unwind.h
@@ -16,6 +16,7 @@
enum unwinder_type {
UNWINDER_GUESS,
UNWINDER_PROLOGUE,
+ UNWINDER_ORC,
};
struct unwind_state {
@@ -24,7 +25,7 @@ struct unwind_state {
struct task_struct *task;
bool first, error, reset;
int graph_idx;
- unsigned long sp, pc, ra;
+ unsigned long sp, fp, pc, ra;
};
bool default_next_frame(struct unwind_state *state);
@@ -61,14 +62,17 @@ static __always_inline void __unwind_start(struct unwind_state *state,
state->sp = regs->regs[3];
state->pc = regs->csr_era;
state->ra = regs->regs[1];
+ state->fp = regs->regs[22];
} else if (task && task != current) {
state->sp = thread_saved_fp(task);
state->pc = thread_saved_ra(task);
state->ra = 0;
+ state->fp = 0;
} else {
state->sp = (unsigned long)__builtin_frame_address(0);
state->pc = (unsigned long)__builtin_return_address(0);
state->ra = 0;
+ state->fp = 0;
}
state->task = task;
get_stack_info(state->sp, state->task, &state->stack_info);
@@ -77,6 +81,18 @@ static __always_inline void __unwind_start(struct unwind_state *state,
static __always_inline unsigned long __unwind_get_return_address(struct unwind_state *state)
{
- return unwind_done(state) ? 0 : state->pc;
+ if (unwind_done(state))
+ return 0;
+
+ return __kernel_text_address(state->pc) ? state->pc : 0;
}
+
+#ifdef CONFIG_UNWINDER_ORC
+void unwind_init(void);
+void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, void *orc, size_t orc_size);
+#else
+static inline void unwind_init(void) {}
+static inline void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, void *orc, size_t orc_size) {}
+#endif
+
#endif /* _ASM_UNWIND_H */
diff --git a/arch/loongarch/include/asm/unwind_hints.h b/arch/loongarch/include/asm/unwind_hints.h
new file mode 100644
index 000000000000..82443fed3167
--- /dev/null
+++ b/arch/loongarch/include/asm/unwind_hints.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_LOONGARCH_UNWIND_HINTS_H
+#define _ASM_LOONGARCH_UNWIND_HINTS_H
+
+#include <linux/objtool.h>
+#include <asm/orc_types.h>
+
+#ifdef __ASSEMBLY__
+
+.macro UNWIND_HINT_UNDEFINED
+ UNWIND_HINT type=UNWIND_HINT_TYPE_UNDEFINED
+.endm
+
+.macro UNWIND_HINT_EMPTY
+ UNWIND_HINT sp_reg=ORC_REG_UNDEFINED type=UNWIND_HINT_TYPE_CALL
+.endm
+
+.macro UNWIND_HINT_REGS
+ UNWIND_HINT sp_reg=ORC_REG_SP type=UNWIND_HINT_TYPE_REGS
+.endm
+
+.macro UNWIND_HINT_FUNC
+ UNWIND_HINT sp_reg=ORC_REG_SP type=UNWIND_HINT_TYPE_CALL
+.endm
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_LOONGARCH_UNWIND_HINTS_H */
diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile
index 3c808c680370..3a7620b66bc6 100644
--- a/arch/loongarch/kernel/Makefile
+++ b/arch/loongarch/kernel/Makefile
@@ -3,6 +3,8 @@
# Makefile for the Linux/LoongArch kernel.
#
+OBJECT_FILES_NON_STANDARD_head.o := y
+
extra-y := vmlinux.lds
obj-y += head.o cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \
@@ -21,6 +23,7 @@ obj-$(CONFIG_ARCH_STRICT_ALIGN) += unaligned.o
CFLAGS_module.o += $(call cc-option,-Wno-override-init,)
CFLAGS_syscall.o += $(call cc-option,-Wno-override-init,)
+CFLAGS_traps.o += $(call cc-option,-Wno-override-init,)
CFLAGS_perf_event.o += $(call cc-option,-Wno-override-init,)
ifdef CONFIG_FUNCTION_TRACER
@@ -62,6 +65,7 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_UNWINDER_GUESS) += unwind_guess.o
obj-$(CONFIG_UNWINDER_PROLOGUE) += unwind_prologue.o
+obj-$(CONFIG_UNWINDER_ORC) += unwind_orc.o
obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_regs.o
obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
diff --git a/arch/loongarch/kernel/entry.S b/arch/loongarch/kernel/entry.S
index 1ec8e4c4cc2b..48e7e34e355e 100644
--- a/arch/loongarch/kernel/entry.S
+++ b/arch/loongarch/kernel/entry.S
@@ -14,11 +14,13 @@
#include <asm/regdef.h>
#include <asm/stackframe.h>
#include <asm/thread_info.h>
+#include <asm/unwind_hints.h>
.text
.cfi_sections .debug_frame
.align 5
SYM_CODE_START(handle_syscall)
+ UNWIND_HINT_UNDEFINED
csrrd t0, PERCPU_BASE_KS
la.pcrel t1, kernelsp
add.d t1, t1, t0
@@ -57,6 +59,7 @@ SYM_CODE_START(handle_syscall)
cfi_st fp, PT_R22
SAVE_STATIC
+ UNWIND_HINT_REGS
#ifdef CONFIG_KGDB
li.w t1, CSR_CRMD_WE
@@ -75,6 +78,7 @@ SYM_CODE_END(handle_syscall)
_ASM_NOKPROBE(handle_syscall)
SYM_CODE_START(ret_from_fork)
+ UNWIND_HINT_REGS
bl schedule_tail # a0 = struct task_struct *prev
move a0, sp
bl syscall_exit_to_user_mode
@@ -84,6 +88,7 @@ SYM_CODE_START(ret_from_fork)
SYM_CODE_END(ret_from_fork)
SYM_CODE_START(ret_from_kernel_thread)
+ UNWIND_HINT_REGS
bl schedule_tail # a0 = struct task_struct *prev
move a0, s1
jirl ra, s0, 0
diff --git a/arch/loongarch/kernel/fpu.S b/arch/loongarch/kernel/fpu.S
index 4382e36ae3d4..69a85f2479fb 100644
--- a/arch/loongarch/kernel/fpu.S
+++ b/arch/loongarch/kernel/fpu.S
@@ -15,6 +15,7 @@
#include <asm/fpregdef.h>
#include <asm/loongarch.h>
#include <asm/regdef.h>
+#include <asm/unwind_hints.h>
#define FPU_REG_WIDTH 8
#define LSX_REG_WIDTH 16
@@ -526,3 +527,9 @@ SYM_FUNC_END(_restore_lasx_context)
.L_fpu_fault:
li.w a0, -EFAULT # failure
jr ra
+
+#ifdef CONFIG_CPU_HAS_LBT
+STACK_FRAME_NON_STANDARD _restore_fp
+STACK_FRAME_NON_STANDARD _restore_lsx
+STACK_FRAME_NON_STANDARD _restore_lasx
+#endif
diff --git a/arch/loongarch/kernel/genex.S b/arch/loongarch/kernel/genex.S
index 2bb3aa2dcfcb..86d5d90ebefe 100644
--- a/arch/loongarch/kernel/genex.S
+++ b/arch/loongarch/kernel/genex.S
@@ -32,6 +32,7 @@ SYM_FUNC_START(__arch_cpu_idle)
SYM_FUNC_END(__arch_cpu_idle)
SYM_CODE_START(handle_vint)
+ UNWIND_HINT_UNDEFINED
BACKUP_T0T1
SAVE_ALL
la_abs t1, __arch_cpu_idle
@@ -49,6 +50,7 @@ SYM_CODE_START(handle_vint)
SYM_CODE_END(handle_vint)
SYM_CODE_START(except_vec_cex)
+ UNWIND_HINT_UNDEFINED
b cache_parity_error
SYM_CODE_END(except_vec_cex)
@@ -67,6 +69,7 @@ SYM_CODE_END(except_vec_cex)
.macro BUILD_HANDLER exception handler prep
.align 5
SYM_CODE_START(handle_\exception)
+ UNWIND_HINT_UNDEFINED
666:
BACKUP_T0T1
SAVE_ALL
@@ -77,7 +80,9 @@ SYM_CODE_END(except_vec_cex)
668:
RESTORE_ALL_AND_RET
SYM_CODE_END(handle_\exception)
+ .pushsection ".data", "aw", %progbits
SYM_DATA(unwind_hint_\exception, .word 668b - 666b)
+ .popsection
.endm
BUILD_HANDLER ade ade badv
@@ -94,6 +99,7 @@ SYM_CODE_END(except_vec_cex)
BUILD_HANDLER reserved reserved none /* others */
SYM_CODE_START(handle_sys)
+ UNWIND_HINT_UNDEFINED
la_abs t0, handle_syscall
jr t0
SYM_CODE_END(handle_sys)
diff --git a/arch/loongarch/kernel/lbt.S b/arch/loongarch/kernel/lbt.S
index 9c75120a26d8..aaea5768c99e 100644
--- a/arch/loongarch/kernel/lbt.S
+++ b/arch/loongarch/kernel/lbt.S
@@ -11,6 +11,7 @@
#include <asm/asm-offsets.h>
#include <asm/errno.h>
#include <asm/regdef.h>
+#include <asm/unwind_hints.h>
#define SCR_REG_WIDTH 8
@@ -149,6 +150,7 @@ SYM_FUNC_START(_restore_ftop_context)
li.w a0, 0 # success
jr ra
SYM_FUNC_END(_restore_ftop_context)
+STACK_FRAME_NON_STANDARD _restore_ftop_context
.L_lbt_fault:
li.w a0, -EFAULT # failure
diff --git a/arch/loongarch/kernel/mcount_dyn.S b/arch/loongarch/kernel/mcount_dyn.S
index 482aa553aa2d..0c65cf09110c 100644
--- a/arch/loongarch/kernel/mcount_dyn.S
+++ b/arch/loongarch/kernel/mcount_dyn.S
@@ -73,6 +73,7 @@ SYM_FUNC_START(ftrace_stub)
SYM_FUNC_END(ftrace_stub)
SYM_CODE_START(ftrace_common)
+ UNWIND_HINT_UNDEFINED
PTR_ADDI a0, ra, -8 /* arg0: ip */
move a1, t0 /* arg1: parent_ip */
la.pcrel t1, function_trace_op
@@ -113,12 +114,14 @@ ftrace_common_return:
SYM_CODE_END(ftrace_common)
SYM_CODE_START(ftrace_caller)
+ UNWIND_HINT_UNDEFINED
ftrace_regs_entry allregs=0
b ftrace_common
SYM_CODE_END(ftrace_caller)
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
SYM_CODE_START(ftrace_regs_caller)
+ UNWIND_HINT_UNDEFINED
ftrace_regs_entry allregs=1
b ftrace_common
SYM_CODE_END(ftrace_regs_caller)
@@ -126,6 +129,7 @@ SYM_CODE_END(ftrace_regs_caller)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
SYM_CODE_START(ftrace_graph_caller)
+ UNWIND_HINT_UNDEFINED
PTR_L a0, sp, PT_ERA
PTR_ADDI a0, a0, -8 /* arg0: self_addr */
PTR_ADDI a1, sp, PT_R1 /* arg1: parent */
@@ -134,6 +138,7 @@ SYM_CODE_START(ftrace_graph_caller)
SYM_CODE_END(ftrace_graph_caller)
SYM_CODE_START(return_to_handler)
+ UNWIND_HINT_UNDEFINED
/* Save return value regs */
PTR_ADDI sp, sp, -FGRET_REGS_SIZE
PTR_S a0, sp, FGRET_REGS_A0
@@ -155,6 +160,7 @@ SYM_CODE_END(return_to_handler)
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
SYM_CODE_START(ftrace_stub_direct_tramp)
+ UNWIND_HINT_UNDEFINED
jr t0
SYM_CODE_END(ftrace_stub_direct_tramp)
#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
diff --git a/arch/loongarch/kernel/module.c b/arch/loongarch/kernel/module.c
index b13b2858fe39..c7d0338d12c1 100644
--- a/arch/loongarch/kernel/module.c
+++ b/arch/loongarch/kernel/module.c
@@ -20,6 +20,7 @@
#include <linux/kernel.h>
#include <asm/alternative.h>
#include <asm/inst.h>
+#include <asm/unwind.h>
static int rela_stack_push(s64 stack_value, s64 *rela_stack, size_t *rela_stack_top)
{
@@ -515,15 +516,28 @@ static void module_init_ftrace_plt(const Elf_Ehdr *hdr,
int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs, struct module *mod)
{
- const Elf_Shdr *s, *se;
const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+ const Elf_Shdr *s, *alt = NULL, *orc = NULL, *orc_ip = NULL, *ftrace = NULL;
- for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) {
+ for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
if (!strcmp(".altinstructions", secstrs + s->sh_name))
- apply_alternatives((void *)s->sh_addr, (void *)s->sh_addr + s->sh_size);
+ alt = s;
+ if (!strcmp(".orc_unwind", secstrs + s->sh_name))
+ orc = s;
+ if (!strcmp(".orc_unwind_ip", secstrs + s->sh_name))
+ orc_ip = s;
if (!strcmp(".ftrace_trampoline", secstrs + s->sh_name))
- module_init_ftrace_plt(hdr, s, mod);
+ ftrace = s;
}
+ if (alt)
+ apply_alternatives((void *)alt->sh_addr, (void *)alt->sh_addr + alt->sh_size);
+
+ if (orc && orc_ip)
+ unwind_module_init(mod, (void *)orc_ip->sh_addr, orc_ip->sh_size, (void *)orc->sh_addr, orc->sh_size);
+
+ if (ftrace)
+ module_init_ftrace_plt(hdr, ftrace, mod);
+
return 0;
}
diff --git a/arch/loongarch/kernel/relocate_kernel.S b/arch/loongarch/kernel/relocate_kernel.S
index f49f6b053763..268e8f7240b6 100644
--- a/arch/loongarch/kernel/relocate_kernel.S
+++ b/arch/loongarch/kernel/relocate_kernel.S
@@ -15,6 +15,7 @@
#include <asm/addrspace.h>
SYM_CODE_START(relocate_new_kernel)
+ UNWIND_HINT_UNDEFINED
/*
* a0: EFI boot flag for the new kernel
* a1: Command line pointer for the new kernel
@@ -90,6 +91,7 @@ SYM_CODE_END(relocate_new_kernel)
* then start at the entry point from LOONGARCH_IOCSR_MBUF0.
*/
SYM_CODE_START(kexec_smp_wait)
+ UNWIND_HINT_UNDEFINED
1: li.w t0, 0x100 /* wait for init loop */
2: addi.w t0, t0, -1 /* limit mailbox access */
bnez t0, 2b
@@ -106,6 +108,6 @@ SYM_CODE_END(kexec_smp_wait)
relocate_new_kernel_end:
-SYM_DATA_START(relocate_new_kernel_size)
- PTR relocate_new_kernel_end - relocate_new_kernel
-SYM_DATA_END(relocate_new_kernel_size)
+.pushsection ".data", "aw", %progbits
+SYM_DATA(relocate_new_kernel_size, .long relocate_new_kernel_end - relocate_new_kernel)
+.popsection
diff --git a/arch/loongarch/kernel/rethook_trampoline.S b/arch/loongarch/kernel/rethook_trampoline.S
index bd5772c96338..d4ceb2fa2a5c 100644
--- a/arch/loongarch/kernel/rethook_trampoline.S
+++ b/arch/loongarch/kernel/rethook_trampoline.S
@@ -76,6 +76,7 @@
.endm
SYM_CODE_START(arch_rethook_trampoline)
+ UNWIND_HINT_UNDEFINED
addi.d sp, sp, -PT_SIZE
save_all_base_regs
diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
index edf2bba80130..3e860bd8d500 100644
--- a/arch/loongarch/kernel/setup.c
+++ b/arch/loongarch/kernel/setup.c
@@ -47,6 +47,7 @@
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/time.h>
+#include <asm/unwind.h>
#define SMBIOS_BIOSSIZE_OFFSET 0x09
#define SMBIOS_BIOSEXTERN_OFFSET 0x13
@@ -587,6 +588,7 @@ static void __init prefill_possible_map(void)
void __init setup_arch(char **cmdline_p)
{
cpu_probe();
+ unwind_init();
init_environ();
efi_init();
diff --git a/arch/loongarch/kernel/stacktrace.c b/arch/loongarch/kernel/stacktrace.c
index f623feb2129f..eaec82e02c92 100644
--- a/arch/loongarch/kernel/stacktrace.c
+++ b/arch/loongarch/kernel/stacktrace.c
@@ -29,6 +29,7 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
regs->csr_era = thread_saved_ra(task);
}
regs->regs[1] = 0;
+ regs->regs[22] = 0;
}
for (unwind_start(&state, task, regs);
diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c
index aebfc3733a76..f9f4eb00c92e 100644
--- a/arch/loongarch/kernel/traps.c
+++ b/arch/loongarch/kernel/traps.c
@@ -53,6 +53,32 @@
#include "access-helper.h"
+void *exception_table[EXCCODE_INT_START] = {
+ [0 ... EXCCODE_INT_START - 1] = handle_reserved,
+
+ [EXCCODE_TLBI] = handle_tlb_load,
+ [EXCCODE_TLBL] = handle_tlb_load,
+ [EXCCODE_TLBS] = handle_tlb_store,
+ [EXCCODE_TLBM] = handle_tlb_modify,
+ [EXCCODE_TLBNR] = handle_tlb_protect,
+ [EXCCODE_TLBNX] = handle_tlb_protect,
+ [EXCCODE_TLBPE] = handle_tlb_protect,
+ [EXCCODE_ADE] = handle_ade,
+ [EXCCODE_ALE] = handle_ale,
+ [EXCCODE_BCE] = handle_bce,
+ [EXCCODE_SYS] = handle_sys,
+ [EXCCODE_BP] = handle_bp,
+ [EXCCODE_INE] = handle_ri,
+ [EXCCODE_IPE] = handle_ri,
+ [EXCCODE_FPDIS] = handle_fpu,
+ [EXCCODE_LSXDIS] = handle_lsx,
+ [EXCCODE_LASXDIS] = handle_lasx,
+ [EXCCODE_FPE] = handle_fpe,
+ [EXCCODE_WATCH] = handle_watch,
+ [EXCCODE_BTDIS] = handle_lbt,
+};
+EXPORT_SYMBOL_GPL(exception_table);
+
static void show_backtrace(struct task_struct *task, const struct pt_regs *regs,
const char *loglvl, bool user)
{
@@ -1150,19 +1176,9 @@ void __init trap_init(void)
for (i = EXCCODE_INT_START; i <= EXCCODE_INT_END; i++)
set_handler(i * VECSIZE, handle_vint, VECSIZE);
- set_handler(EXCCODE_ADE * VECSIZE, handle_ade, VECSIZE);
- set_handler(EXCCODE_ALE * VECSIZE, handle_ale, VECSIZE);
- set_handler(EXCCODE_BCE * VECSIZE, handle_bce, VECSIZE);
- set_handler(EXCCODE_SYS * VECSIZE, handle_sys, VECSIZE);
- set_handler(EXCCODE_BP * VECSIZE, handle_bp, VECSIZE);
- set_handler(EXCCODE_INE * VECSIZE, handle_ri, VECSIZE);
- set_handler(EXCCODE_IPE * VECSIZE, handle_ri, VECSIZE);
- set_handler(EXCCODE_FPDIS * VECSIZE, handle_fpu, VECSIZE);
- set_handler(EXCCODE_LSXDIS * VECSIZE, handle_lsx, VECSIZE);
- set_handler(EXCCODE_LASXDIS * VECSIZE, handle_lasx, VECSIZE);
- set_handler(EXCCODE_FPE * VECSIZE, handle_fpe, VECSIZE);
- set_handler(EXCCODE_BTDIS * VECSIZE, handle_lbt, VECSIZE);
- set_handler(EXCCODE_WATCH * VECSIZE, handle_watch, VECSIZE);
+ /* Set exception vector handler */
+ for (i = EXCCODE_ADE; i <= EXCCODE_BTDIS; i++)
+ set_handler(i * VECSIZE, exception_table[i], VECSIZE);
cache_error_setup();
diff --git a/arch/loongarch/kernel/unwind_orc.c b/arch/loongarch/kernel/unwind_orc.c
new file mode 100644
index 000000000000..15f18d1e0dad
--- /dev/null
+++ b/arch/loongarch/kernel/unwind_orc.c
@@ -0,0 +1,516 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/objtool.h>
+#include <linux/module.h>
+#include <linux/sort.h>
+#include <asm/exception.h>
+#include <asm/orc_header.h>
+#include <asm/orc_lookup.h>
+#include <asm/orc_types.h>
+#include <asm/ptrace.h>
+#include <asm/setup.h>
+#include <asm/stacktrace.h>
+#include <asm/tlb.h>
+#include <asm/unwind.h>
+
+ORC_HEADER;
+
+#define orc_warn(fmt, ...) \
+ printk_deferred_once(KERN_WARNING "WARNING: " fmt, ##__VA_ARGS__)
+
+extern int __start_orc_unwind_ip[];
+extern int __stop_orc_unwind_ip[];
+extern struct orc_entry __start_orc_unwind[];
+extern struct orc_entry __stop_orc_unwind[];
+
+static bool orc_init __ro_after_init;
+static unsigned int lookup_num_blocks __ro_after_init;
+
+/* Fake frame pointer entry -- used as a fallback for generated code */
+static struct orc_entry orc_fp_entry = {
+ .sp_reg = ORC_REG_FP,
+ .sp_offset = 16,
+ .fp_reg = ORC_REG_PREV_SP,
+ .fp_offset = -16,
+ .ra_reg = ORC_REG_PREV_SP,
+ .ra_offset = -8,
+ .type = ORC_TYPE_CALL
+};
+
+/*
+ * If we crash with IP==0, the last successfully executed instruction
+ * was probably an indirect function call with a NULL function pointer,
+ * and we don't have unwind information for NULL.
+ * This hardcoded ORC entry for IP==0 allows us to unwind from a NULL function
+ * pointer into its parent and then continue normally from there.
+ */
+static struct orc_entry orc_null_entry = {
+ .sp_reg = ORC_REG_SP,
+ .sp_offset = sizeof(long),
+ .fp_reg = ORC_REG_UNDEFINED,
+ .type = ORC_TYPE_CALL
+};
+
+static inline unsigned long orc_ip(const int *ip)
+{
+ return (unsigned long)ip + *ip;
+}
+
+static struct orc_entry *__orc_find(int *ip_table, struct orc_entry *u_table,
+ unsigned int num_entries, unsigned long ip)
+{
+ int *first = ip_table;
+ int *mid = first, *found = first;
+ int *last = ip_table + num_entries - 1;
+
+ if (!num_entries)
+ return NULL;
+
+ /*
+ * Do a binary range search to find the rightmost duplicate of a given
+ * starting address. Some entries are section terminators which are
+ * "weak" entries for ensuring there are no gaps. They should be
+ * ignored when they conflict with a real entry.
+ */
+ while (first <= last) {
+ mid = first + ((last - first) / 2);
+
+ if (orc_ip(mid) <= ip) {
+ found = mid;
+ first = mid + 1;
+ } else
+ last = mid - 1;
+ }
+
+ return u_table + (found - ip_table);
+}
+
+#ifdef CONFIG_MODULES
+static struct orc_entry *orc_module_find(unsigned long ip)
+{
+ struct module *mod;
+
+ mod = __module_address(ip);
+ if (!mod || !mod->arch.orc_unwind || !mod->arch.orc_unwind_ip)
+ return NULL;
+
+ return __orc_find(mod->arch.orc_unwind_ip, mod->arch.orc_unwind, mod->arch.num_orcs, ip);
+}
+#else
+static struct orc_entry *orc_module_find(unsigned long ip)
+{
+ return NULL;
+}
+#endif
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+static struct orc_entry *orc_find(unsigned long ip);
+
+/*
+ * Ftrace dynamic trampolines do not have orc entries of their own.
+ * But they are copies of the ftrace entries that are static and
+ * defined in ftrace_*.S, which do have orc entries.
+ *
+ * If the unwinder comes across a ftrace trampoline, then find the
+ * ftrace function that was used to create it, and use that ftrace
+ * function's orc entry, as the placement of the return code in
+ * the stack will be identical.
+ */
+static struct orc_entry *orc_ftrace_find(unsigned long ip)
+{
+ struct ftrace_ops *ops;
+ unsigned long tramp_addr, offset;
+
+ ops = ftrace_ops_trampoline(ip);
+ if (!ops)
+ return NULL;
+
+ /* Set tramp_addr to the start of the code copied by the trampoline */
+ if (ops->flags & FTRACE_OPS_FL_SAVE_REGS)
+ tramp_addr = (unsigned long)ftrace_regs_caller;
+ else
+ tramp_addr = (unsigned long)ftrace_caller;
+
+ /* Now place tramp_addr to the location within the trampoline ip is at */
+ offset = ip - ops->trampoline;
+ tramp_addr += offset;
+
+ /* Prevent unlikely recursion */
+ if (ip == tramp_addr)
+ return NULL;
+
+ return orc_find(tramp_addr);
+}
+#else
+static struct orc_entry *orc_ftrace_find(unsigned long ip)
+{
+ return NULL;
+}
+#endif
+
+static struct orc_entry *orc_find(unsigned long ip)
+{
+ static struct orc_entry *orc;
+
+ if (ip == 0)
+ return &orc_null_entry;
+
+ /* For non-init vmlinux addresses, use the fast lookup table: */
+ if (ip >= LOOKUP_START_IP && ip < LOOKUP_STOP_IP) {
+ unsigned int idx, start, stop;
+
+ idx = (ip - LOOKUP_START_IP) / LOOKUP_BLOCK_SIZE;
+
+ if (unlikely((idx >= lookup_num_blocks-1))) {
+ orc_warn("WARNING: bad lookup idx: idx=%u num=%u ip=%pB\n",
+ idx, lookup_num_blocks, (void *)ip);
+ return NULL;
+ }
+
+ start = orc_lookup[idx];
+ stop = orc_lookup[idx + 1] + 1;
+
+ if (unlikely((__start_orc_unwind + start >= __stop_orc_unwind) ||
+ (__start_orc_unwind + stop > __stop_orc_unwind))) {
+ orc_warn("WARNING: bad lookup value: idx=%u num=%u start=%u stop=%u ip=%pB\n",
+ idx, lookup_num_blocks, start, stop, (void *)ip);
+ return NULL;
+ }
+
+ return __orc_find(__start_orc_unwind_ip + start,
+ __start_orc_unwind + start, stop - start, ip);
+ }
+
+ /* vmlinux .init slow lookup: */
+ if (is_kernel_inittext(ip))
+ return __orc_find(__start_orc_unwind_ip, __start_orc_unwind,
+ __stop_orc_unwind_ip - __start_orc_unwind_ip, ip);
+
+ /* Module lookup: */
+ orc = orc_module_find(ip);
+ if (orc)
+ return orc;
+
+ return orc_ftrace_find(ip);
+}
+
+#ifdef CONFIG_MODULES
+
+static DEFINE_MUTEX(sort_mutex);
+static int *cur_orc_ip_table = __start_orc_unwind_ip;
+static struct orc_entry *cur_orc_table = __start_orc_unwind;
+
+static void orc_sort_swap(void *_a, void *_b, int size)
+{
+ int delta = _b - _a;
+ int *a = _a, *b = _b, tmp;
+ struct orc_entry *orc_a, *orc_b;
+
+ /* Swap the .orc_unwind_ip entries: */
+ tmp = *a;
+ *a = *b + delta;
+ *b = tmp - delta;
+
+ /* Swap the corresponding .orc_unwind entries: */
+ orc_a = cur_orc_table + (a - cur_orc_ip_table);
+ orc_b = cur_orc_table + (b - cur_orc_ip_table);
+ swap(*orc_a, *orc_b);
+}
+
+static int orc_sort_cmp(const void *_a, const void *_b)
+{
+ const int *a = _a, *b = _b;
+ unsigned long a_val = orc_ip(a);
+ unsigned long b_val = orc_ip(b);
+ struct orc_entry *orc_a;
+
+ if (a_val > b_val)
+ return 1;
+ if (a_val < b_val)
+ return -1;
+
+ /*
+ * The "weak" section terminator entries need to always be first
+ * to ensure the lookup code skips them in favor of real entries.
+ * These terminator entries exist to handle any gaps created by
+ * whitelisted .o files which didn't get objtool generation.
+ */
+ orc_a = cur_orc_table + (a - cur_orc_ip_table);
+
+ return orc_a->type == ORC_TYPE_UNDEFINED ? -1 : 1;
+}
+
+void unwind_module_init(struct module *mod, void *_orc_ip, size_t orc_ip_size,
+ void *_orc, size_t orc_size)
+{
+ int *orc_ip = _orc_ip;
+ struct orc_entry *orc = _orc;
+ unsigned int num_entries = orc_ip_size / sizeof(int);
+
+ WARN_ON_ONCE(orc_ip_size % sizeof(int) != 0 ||
+ orc_size % sizeof(*orc) != 0 ||
+ num_entries != orc_size / sizeof(*orc));
+
+ /*
+ * The 'cur_orc_*' globals allow the orc_sort_swap() callback to
+ * associate an .orc_unwind_ip table entry with its corresponding
+ * .orc_unwind entry so they can both be swapped.
+ */
+ mutex_lock(&sort_mutex);
+ cur_orc_ip_table = orc_ip;
+ cur_orc_table = orc;
+ sort(orc_ip, num_entries, sizeof(int), orc_sort_cmp, orc_sort_swap);
+ mutex_unlock(&sort_mutex);
+
+ mod->arch.orc_unwind_ip = orc_ip;
+ mod->arch.orc_unwind = orc;
+ mod->arch.num_orcs = num_entries;
+}
+#endif
+
+void __init unwind_init(void)
+{
+ int i;
+ size_t orc_size = (void *)__stop_orc_unwind - (void *)__start_orc_unwind;
+ size_t orc_ip_size = (void *)__stop_orc_unwind_ip - (void *)__start_orc_unwind_ip;
+ size_t num_entries = orc_ip_size / sizeof(int);
+ struct orc_entry *orc;
+
+ if (!num_entries || orc_ip_size % sizeof(int) != 0 ||
+ orc_size % sizeof(struct orc_entry) != 0 ||
+ num_entries != orc_size / sizeof(struct orc_entry)) {
+ orc_warn("WARNING: Bad or missing .orc_unwind table. Disabling unwinder.\n");
+ return;
+ }
+
+ /*
+ * Note, the orc_unwind and orc_unwind_ip tables were already
+ * sorted at build time via the 'sorttable' tool.
+ * It's ready for binary search straight away, no need to sort it.
+ */
+
+ /* Initialize the fast lookup table: */
+ lookup_num_blocks = orc_lookup_end - orc_lookup;
+ for (i = 0; i < lookup_num_blocks-1; i++) {
+ orc = __orc_find(__start_orc_unwind_ip, __start_orc_unwind,
+ num_entries, LOOKUP_START_IP + (LOOKUP_BLOCK_SIZE * i));
+ if (!orc) {
+ orc_warn("WARNING: Corrupt .orc_unwind table. Disabling unwinder.\n");
+ return;
+ }
+
+ orc_lookup[i] = orc - __start_orc_unwind;
+ }
+
+ /* Initialize the ending block: */
+ orc = __orc_find(__start_orc_unwind_ip, __start_orc_unwind, num_entries, LOOKUP_STOP_IP);
+ if (!orc) {
+ orc_warn("WARNING: Corrupt .orc_unwind table. Disabling unwinder.\n");
+ return;
+ }
+ orc_lookup[lookup_num_blocks-1] = orc - __start_orc_unwind;
+
+ orc_init = true;
+}
+
+static inline bool on_stack(struct stack_info *info, unsigned long addr, size_t len)
+{
+ unsigned long begin = info->begin;
+ unsigned long end = info->end;
+
+ return (info->type != STACK_TYPE_UNKNOWN &&
+ addr >= begin && addr < end && addr + len > begin && addr + len <= end);
+}
+
+static bool stack_access_ok(struct unwind_state *state, unsigned long addr, size_t len)
+{
+ struct stack_info *info = &state->stack_info;
+
+ if (on_stack(info, addr, len))
+ return true;
+
+ return !get_stack_info(addr, state->task, info) && on_stack(info, addr, len);
+}
+
+unsigned long unwind_get_return_address(struct unwind_state *state)
+{
+ return __unwind_get_return_address(state);
+}
+EXPORT_SYMBOL_GPL(unwind_get_return_address);
+
+void unwind_start(struct unwind_state *state, struct task_struct *task,
+ struct pt_regs *regs)
+{
+ __unwind_start(state, task, regs);
+ state->type = UNWINDER_ORC;
+ if (!unwind_done(state) && !__kernel_text_address(state->pc))
+ unwind_next_frame(state);
+}
+EXPORT_SYMBOL_GPL(unwind_start);
+
+static bool is_entry_func(unsigned long addr)
+{
+ extern u32 kernel_entry;
+ extern u32 kernel_entry_end;
+
+ return addr >= (unsigned long)&kernel_entry && addr < (unsigned long)&kernel_entry_end;
+}
+
+static inline unsigned long bt_address(unsigned long ra)
+{
+ extern unsigned long eentry;
+
+ if (__kernel_text_address(ra))
+ return ra;
+
+ if (__module_text_address(ra))
+ return ra;
+
+ if (ra >= eentry && ra < eentry + EXCCODE_INT_END * VECSIZE) {
+ unsigned long func;
+ unsigned long type = (ra - eentry) / VECSIZE;
+ unsigned long offset = (ra - eentry) % VECSIZE;
+
+ switch (type) {
+ case 0 ... EXCCODE_INT_START - 1:
+ func = (unsigned long)exception_table[type];
+ break;
+ case EXCCODE_INT_START ... EXCCODE_INT_END:
+ func = (unsigned long)handle_vint;
+ break;
+ default:
+ func = (unsigned long)handle_reserved;
+ break;
+ }
+
+ return func + offset;
+ }
+
+ return ra;
+}
+
+bool unwind_next_frame(struct unwind_state *state)
+{
+ unsigned long *p, pc;
+ struct pt_regs *regs;
+ struct orc_entry *orc;
+ struct stack_info *info = &state->stack_info;
+
+ if (unwind_done(state))
+ return false;
+
+ /* Don't let modules unload while we're reading their ORC data. */
+ preempt_disable();
+
+ if (is_entry_func(state->pc))
+ goto end;
+
+ orc = orc_find(state->pc);
+ if (!orc) {
+ orc = &orc_fp_entry;
+ state->error = true;
+ }
+
+ switch (orc->sp_reg) {
+ case ORC_REG_SP:
+ if (info->type == STACK_TYPE_IRQ && state->sp == info->end)
+ orc->type = ORC_TYPE_REGS;
+ else
+ state->sp = state->sp + orc->sp_offset;
+ break;
+ case ORC_REG_FP:
+ state->sp = state->fp;
+ break;
+ default:
+ orc_warn("unknown SP base reg %d at %pB\n", orc->sp_reg, (void *)state->pc);
+ goto err;
+ }
+
+ switch (orc->fp_reg) {
+ case ORC_REG_PREV_SP:
+ p = (unsigned long *)(state->sp + orc->fp_offset);
+ if (!stack_access_ok(state, (unsigned long)p, sizeof(unsigned long)))
+ goto err;
+
+ state->fp = *p;
+ break;
+ case ORC_REG_UNDEFINED:
+ /* Nothing. */
+ break;
+ default:
+ orc_warn("unknown FP base reg %d at %pB\n", orc->fp_reg, (void *)state->pc);
+ goto err;
+ }
+
+ switch (orc->type) {
+ case ORC_TYPE_CALL:
+ if (orc->ra_reg == ORC_REG_PREV_SP) {
+ p = (unsigned long *)(state->sp + orc->ra_offset);
+ if (!stack_access_ok(state, (unsigned long)p, sizeof(unsigned long)))
+ goto err;
+
+ pc = unwind_graph_addr(state, *p, state->sp);
+ pc -= LOONGARCH_INSN_SIZE;
+ } else if (orc->ra_reg == ORC_REG_UNDEFINED) {
+ if (!state->ra || state->ra == state->pc)
+ goto err;
+
+ pc = unwind_graph_addr(state, state->ra, state->sp);
+ pc -= LOONGARCH_INSN_SIZE;
+ state->ra = 0;
+ } else {
+ orc_warn("unknown ra base reg %d at %pB\n", orc->ra_reg, (void *)state->pc);
+ goto err;
+ }
+ break;
+ case ORC_TYPE_REGS:
+ if (info->type == STACK_TYPE_IRQ && state->sp == info->end)
+ regs = (struct pt_regs *)info->next_sp;
+ else
+ regs = (struct pt_regs *)state->sp;
+
+ if (!stack_access_ok(state, (unsigned long)regs, sizeof(*regs)))
+ goto err;
+
+ if ((info->end == (unsigned long)regs + sizeof(*regs)) &&
+ !regs->regs[3] && !regs->regs[1])
+ goto end;
+
+ if (user_mode(regs))
+ goto end;
+
+ pc = regs->csr_era;
+ if (!__kernel_text_address(pc))
+ goto err;
+
+ state->sp = regs->regs[3];
+ state->ra = regs->regs[1];
+ state->fp = regs->regs[22];
+ get_stack_info(state->sp, state->task, info);
+
+ break;
+ default:
+ orc_warn("unknown .orc_unwind entry type %d at %pB\n", orc->type, (void *)state->pc);
+ goto err;
+ }
+
+ state->pc = bt_address(pc);
+ if (!state->pc) {
+ pr_err("cannot find unwind pc at %pK\n", (void *)pc);
+ goto err;
+ }
+
+ if (!__kernel_text_address(state->pc))
+ goto err;
+
+ preempt_enable();
+ return true;
+
+err:
+ state->error = true;
+
+end:
+ preempt_enable();
+ state->stack_info.type = STACK_TYPE_UNKNOWN;
+ return false;
+}
+EXPORT_SYMBOL_GPL(unwind_next_frame);
diff --git a/arch/loongarch/kernel/vmlinux.lds.S b/arch/loongarch/kernel/vmlinux.lds.S
index a5d0cd2035da..e8e97dbf9ca4 100644
--- a/arch/loongarch/kernel/vmlinux.lds.S
+++ b/arch/loongarch/kernel/vmlinux.lds.S
@@ -2,6 +2,7 @@
#include <linux/sizes.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
+#include <asm/orc_lookup.h>
#define PAGE_SIZE _PAGE_SIZE
#define RO_EXCEPTION_TABLE_ALIGN 4
@@ -122,6 +123,8 @@ SECTIONS
}
#endif
+ ORC_UNWIND_TABLE
+
.sdata : {
*(.sdata)
}
diff --git a/arch/loongarch/kvm/switch.S b/arch/loongarch/kvm/switch.S
index ba976509bfe8..1fcc4b7eda32 100644
--- a/arch/loongarch/kvm/switch.S
+++ b/arch/loongarch/kvm/switch.S
@@ -8,7 +8,7 @@
#include <asm/asmmacro.h>
#include <asm/loongarch.h>
#include <asm/regdef.h>
-#include <asm/stackframe.h>
+#include <asm/unwind_hints.h>
#define HGPR_OFFSET(x) (PT_R0 + 8*x)
#define GGPR_OFFSET(x) (KVM_ARCH_GGPR + 8*x)
@@ -112,6 +112,7 @@
.text
.cfi_sections .debug_frame
SYM_CODE_START(kvm_exc_entry)
+ UNWIND_HINT_UNDEFINED
csrwr a2, KVM_TEMP_KS
csrrd a2, KVM_VCPU_KS
addi.d a2, a2, KVM_VCPU_ARCH
@@ -279,3 +280,9 @@ SYM_FUNC_END(kvm_restore_lasx)
.section ".rodata"
SYM_DATA(kvm_exception_size, .quad kvm_exc_entry_end - kvm_exc_entry)
SYM_DATA(kvm_enter_guest_size, .quad kvm_enter_guest_end - kvm_enter_guest)
+
+#ifdef CONFIG_CPU_HAS_LBT
+STACK_FRAME_NON_STANDARD kvm_restore_fpu
+STACK_FRAME_NON_STANDARD kvm_restore_lsx
+STACK_FRAME_NON_STANDARD kvm_restore_lasx
+#endif
diff --git a/arch/loongarch/lib/clear_user.S b/arch/loongarch/lib/clear_user.S
index be741544e62b..72484e401318 100644
--- a/arch/loongarch/lib/clear_user.S
+++ b/arch/loongarch/lib/clear_user.S
@@ -10,6 +10,7 @@
#include <asm/asm-extable.h>
#include <asm/cpu.h>
#include <asm/regdef.h>
+#include <asm/unwind_hints.h>
SYM_FUNC_START(__clear_user)
/*
@@ -204,3 +205,4 @@ SYM_FUNC_START(__clear_user_fast)
_asm_extable 28b, .Lsmall_fixup
_asm_extable 29b, .Lexit
SYM_FUNC_END(__clear_user_fast)
+STACK_FRAME_NON_STANDARD __clear_user_fast
diff --git a/arch/loongarch/lib/copy_user.S b/arch/loongarch/lib/copy_user.S
index feec3d362803..d5279bba4700 100644
--- a/arch/loongarch/lib/copy_user.S
+++ b/arch/loongarch/lib/copy_user.S
@@ -10,6 +10,7 @@
#include <asm/asm-extable.h>
#include <asm/cpu.h>
#include <asm/regdef.h>
+#include <asm/unwind_hints.h>
SYM_FUNC_START(__copy_user)
/*
@@ -278,3 +279,4 @@ SYM_FUNC_START(__copy_user_fast)
_asm_extable 58b, .Lexit
_asm_extable 59b, .Lexit
SYM_FUNC_END(__copy_user_fast)
+STACK_FRAME_NON_STANDARD __copy_user_fast
diff --git a/arch/loongarch/lib/memcpy.S b/arch/loongarch/lib/memcpy.S
index fa1148878d2b..50f38320a312 100644
--- a/arch/loongarch/lib/memcpy.S
+++ b/arch/loongarch/lib/memcpy.S
@@ -9,6 +9,7 @@
#include <asm/asmmacro.h>
#include <asm/cpu.h>
#include <asm/regdef.h>
+#include <asm/unwind_hints.h>
.section .noinstr.text, "ax"
@@ -109,6 +110,7 @@ SYM_FUNC_START_NOALIGN(__memcpy_small)
jr ra
SYM_FUNC_END(__memcpy_small)
_ASM_NOKPROBE(__memcpy_small)
+STACK_FRAME_NON_STANDARD __memcpy_small
/*
* void *__memcpy_fast(void *dst, const void *src, size_t n)
diff --git a/arch/loongarch/lib/memset.S b/arch/loongarch/lib/memset.S
index 06d3ca54cbfe..c518fbec64db 100644
--- a/arch/loongarch/lib/memset.S
+++ b/arch/loongarch/lib/memset.S
@@ -9,6 +9,7 @@
#include <asm/asmmacro.h>
#include <asm/cpu.h>
#include <asm/regdef.h>
+#include <asm/unwind_hints.h>
.macro fill_to_64 r0
bstrins.d \r0, \r0, 15, 8
@@ -166,3 +167,4 @@ SYM_FUNC_START(__memset_fast)
jr ra
SYM_FUNC_END(__memset_fast)
_ASM_NOKPROBE(__memset_fast)
+STACK_FRAME_NON_STANDARD __memset_fast
diff --git a/arch/loongarch/mm/tlb.c b/arch/loongarch/mm/tlb.c
index 0b95d32b30c9..5ac9beb5f093 100644
--- a/arch/loongarch/mm/tlb.c
+++ b/arch/loongarch/mm/tlb.c
@@ -9,8 +9,9 @@
#include <linux/hugetlb.h>
#include <linux/export.h>
-#include <asm/cpu.h>
#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/exception.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/tlb.h>
@@ -266,24 +267,20 @@ static void setup_tlb_handler(int cpu)
setup_ptwalker();
local_flush_tlb_all();
+ if (cpu_has_ptw) {
+ exception_table[EXCCODE_TLBI] = handle_tlb_load_ptw;
+ exception_table[EXCCODE_TLBL] = handle_tlb_load_ptw;
+ exception_table[EXCCODE_TLBS] = handle_tlb_store_ptw;
+ exception_table[EXCCODE_TLBM] = handle_tlb_modify_ptw;
+ }
+
/* The tlb handlers are generated only once */
if (cpu == 0) {
memcpy((void *)tlbrentry, handle_tlb_refill, 0x80);
local_flush_icache_range(tlbrentry, tlbrentry + 0x80);
- if (!cpu_has_ptw) {
- set_handler(EXCCODE_TLBI * VECSIZE, handle_tlb_load, VECSIZE);
- set_handler(EXCCODE_TLBL * VECSIZE, handle_tlb_load, VECSIZE);
- set_handler(EXCCODE_TLBS * VECSIZE, handle_tlb_store, VECSIZE);
- set_handler(EXCCODE_TLBM * VECSIZE, handle_tlb_modify, VECSIZE);
- } else {
- set_handler(EXCCODE_TLBI * VECSIZE, handle_tlb_load_ptw, VECSIZE);
- set_handler(EXCCODE_TLBL * VECSIZE, handle_tlb_load_ptw, VECSIZE);
- set_handler(EXCCODE_TLBS * VECSIZE, handle_tlb_store_ptw, VECSIZE);
- set_handler(EXCCODE_TLBM * VECSIZE, handle_tlb_modify_ptw, VECSIZE);
- }
- set_handler(EXCCODE_TLBNR * VECSIZE, handle_tlb_protect, VECSIZE);
- set_handler(EXCCODE_TLBNX * VECSIZE, handle_tlb_protect, VECSIZE);
- set_handler(EXCCODE_TLBPE * VECSIZE, handle_tlb_protect, VECSIZE);
+
+ for (int i = EXCCODE_TLBL; i <= EXCCODE_TLBPE; i++)
+ set_handler(i * VECSIZE, exception_table[i], VECSIZE);
} else {
int vec_sz __maybe_unused;
void *addr __maybe_unused;
diff --git a/arch/loongarch/mm/tlbex.S b/arch/loongarch/mm/tlbex.S
index d5d682f3d29f..a44387b838af 100644
--- a/arch/loongarch/mm/tlbex.S
+++ b/arch/loongarch/mm/tlbex.S
@@ -18,6 +18,7 @@
.macro tlb_do_page_fault, write
SYM_CODE_START(tlb_do_page_fault_\write)
+ UNWIND_HINT_UNDEFINED
SAVE_ALL
csrrd a2, LOONGARCH_CSR_BADV
move a0, sp
@@ -32,6 +33,7 @@
tlb_do_page_fault 1
SYM_CODE_START(handle_tlb_protect)
+ UNWIND_HINT_UNDEFINED
BACKUP_T0T1
SAVE_ALL
move a0, sp
@@ -44,6 +46,7 @@ SYM_CODE_START(handle_tlb_protect)
SYM_CODE_END(handle_tlb_protect)
SYM_CODE_START(handle_tlb_load)
+ UNWIND_HINT_UNDEFINED
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2
@@ -190,6 +193,7 @@ nopage_tlb_load:
SYM_CODE_END(handle_tlb_load)
SYM_CODE_START(handle_tlb_load_ptw)
+ UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_KS0
csrwr t1, LOONGARCH_CSR_KS1
la_abs t0, tlb_do_page_fault_0
@@ -197,6 +201,7 @@ SYM_CODE_START(handle_tlb_load_ptw)
SYM_CODE_END(handle_tlb_load_ptw)
SYM_CODE_START(handle_tlb_store)
+ UNWIND_HINT_UNDEFINED
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2
@@ -346,6 +351,7 @@ nopage_tlb_store:
SYM_CODE_END(handle_tlb_store)
SYM_CODE_START(handle_tlb_store_ptw)
+ UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_KS0
csrwr t1, LOONGARCH_CSR_KS1
la_abs t0, tlb_do_page_fault_1
@@ -353,6 +359,7 @@ SYM_CODE_START(handle_tlb_store_ptw)
SYM_CODE_END(handle_tlb_store_ptw)
SYM_CODE_START(handle_tlb_modify)
+ UNWIND_HINT_UNDEFINED
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2
@@ -500,6 +507,7 @@ nopage_tlb_modify:
SYM_CODE_END(handle_tlb_modify)
SYM_CODE_START(handle_tlb_modify_ptw)
+ UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_KS0
csrwr t1, LOONGARCH_CSR_KS1
la_abs t0, tlb_do_page_fault_1
@@ -507,6 +515,7 @@ SYM_CODE_START(handle_tlb_modify_ptw)
SYM_CODE_END(handle_tlb_modify_ptw)
SYM_CODE_START(handle_tlb_refill)
+ UNWIND_HINT_UNDEFINED
csrwr t0, LOONGARCH_CSR_TLBRSAVE
csrrd t0, LOONGARCH_CSR_PGD
lddir t0, t0, 3
diff --git a/arch/loongarch/vdso/Makefile b/arch/loongarch/vdso/Makefile
index c74c9921304f..7a4ad96522ac 100644
--- a/arch/loongarch/vdso/Makefile
+++ b/arch/loongarch/vdso/Makefile
@@ -3,6 +3,7 @@
KASAN_SANITIZE := n
KCOV_INSTRUMENT := n
+OBJECT_FILES_NON_STANDARD := y
# Include the generic Makefile to check the built vdso.
include $(srctree)/lib/vdso/Makefile
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index bb1339c7057b..39f2d4a05208 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -116,6 +116,14 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
*/
#define __stringify_label(n) #n
+#define __annotate_reachable(c) ({ \
+ asm volatile(__stringify_label(c) ":\n\t" \
+ ".pushsection .discard.reachable\n\t" \
+ ".long " __stringify_label(c) "b - .\n\t" \
+ ".popsection\n\t"); \
+})
+#define annotate_reachable() __annotate_reachable(__COUNTER__)
+
#define __annotate_unreachable(c) ({ \
asm volatile(__stringify_label(c) ":\n\t" \
".pushsection .discard.unreachable\n\t" \
@@ -128,6 +136,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
#define __annotate_jump_table __section(".rodata..c_jump_table")
#else /* !CONFIG_OBJTOOL */
+#define annotate_reachable()
#define annotate_unreachable()
#define __annotate_jump_table
#endif /* CONFIG_OBJTOOL */
diff --git a/scripts/Makefile b/scripts/Makefile
index 576cf64be667..e4cca53d2285 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -31,9 +31,12 @@ HOSTLDLIBS_sign-file = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null |
ifdef CONFIG_UNWINDER_ORC
ifeq ($(ARCH),x86_64)
-ARCH := x86
+SRCARCH := x86
endif
-HOSTCFLAGS_sorttable.o += -I$(srctree)/tools/arch/x86/include
+ifeq ($(ARCH),loongarch)
+SRCARCH := loongarch
+endif
+HOSTCFLAGS_sorttable.o += -I$(srctree)/tools/arch/$(SRCARCH)/include
HOSTCFLAGS_sorttable.o += -DUNWINDER_ORC_ENABLED
endif
--
2.42.0
When update the latest upstream gcc and binutils, it generates some
objtool warnings on LoongArch, like this:
arch/loongarch/kernel/entry.o: warning: objtool: ret_from_fork+0x0: unreachable instruction
We can see that the reloc sym name is local label instead of section
in relocation section '.rela.discard.unwind_hints', in this case, the
reloc sym type is STT_NOTYPE instead of STT_SECTION. Let us check it
to not return -1, then use reloc->sym->offset instead of reloc addend
which is 0 to find the corresponding instruction.
Here are some detailed info:
[fedora@linux 6.8.test]$ gcc --version
gcc (GCC) 14.0.1 20240129 (experimental)
[fedora@linux 6.8.test]$ as --version
GNU assembler (GNU Binutils) 2.42.50.20240129
[fedora@linux 6.8.test]$ readelf -r arch/loongarch/kernel/entry.o | grep -A 3 "rela.discard.unwind_hints"
Relocation section '.rela.discard.unwind_hints' at offset 0x3a8 contains 7 entries:
Offset Info Type Sym. Value Sym. Name + Addend
000000000000 000a00000063 R_LARCH_32_PCREL 0000000000000000 .Lhere_1 + 0
00000000000c 000b00000063 R_LARCH_32_PCREL 00000000000000a8 .Lhere_50 + 0
Signed-off-by: Tiezhu Yang <[email protected]>
---
tools/objtool/check.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index d0e82c729dd9..1009d144f756 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2227,6 +2227,7 @@ static int read_unwind_hints(struct objtool_file *file)
struct unwind_hint *hint;
struct instruction *insn;
struct reloc *reloc;
+ unsigned long offset;
int i;
sec = find_section_by_name(file->elf, ".discard.unwind_hints");
@@ -2254,7 +2255,16 @@ static int read_unwind_hints(struct objtool_file *file)
return -1;
}
- insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
+ if (reloc->sym->type == STT_SECTION) {
+ offset = reloc_addend(reloc);
+ } else if (reloc->sym->local_label) {
+ offset = reloc->sym->offset;
+ } else {
+ WARN("unexpected relocation symbol type in %s", sec->rsec->name);
+ return -1;
+ }
+
+ insn = find_insn(file, reloc->sym->sec, offset);
if (!insn) {
WARN("can't find insn for unwind_hints[%d]", i);
return -1;
--
2.42.0
Hi, Josh and Peter,
This version looks good to me now. Should this series go through the
objtool tree or the loongarch tree? If it should go through the
objtool tree, then please apply the first 6 patches with
Acked-by: Huacai Chen <[email protected]>
And if it can go through the loongarch tree, I will apply the whole 8
patches. Thanks.
Huacai
On Tue, Jan 30, 2024 at 2:17 PM Tiezhu Yang <[email protected]> wrote:
>
> This version is based on 6.8-rc2, tested with the latest upstream
> gcc and binutils (20240129).
>
> v6:
> -- Add "-mno-relax" option
> -- Remove "-fno-optimize-sibling-calls" option
> -- Remove "-falign-functions=4 -falign-labels=4" options
> -- Remove "#ifdef CONFIG_CPU_HAS_LBT" in lbt.S
> -- Remove patch "objtool: Check local label about sibling call"
> -- Silence the objtool warnings under CONFIG_FUNCTION_TRACER
> -- Add livepatching support and fix the problems when testing
>
> Tiezhu Yang (8):
> objtool/LoongArch: Enable objtool to be built
> objtool/LoongArch: Implement instruction decoder
> objtool/x86: Separate arch-specific and generic parts
> objtool/LoongArch: Enable orc to be built
> objtool: Check local label in add_dead_ends()
> objtool: Check local label in read_unwind_hints()
> LoongArch: Add ORC stack unwinder support
> LoongArch: Add kernel livepatching support
>
> arch/loongarch/Kconfig | 6 +
> arch/loongarch/Kconfig.debug | 11 +
> arch/loongarch/Makefile | 23 +-
> arch/loongarch/include/asm/Kbuild | 2 +
> arch/loongarch/include/asm/bug.h | 1 +
> arch/loongarch/include/asm/exception.h | 2 +
> arch/loongarch/include/asm/module.h | 7 +
> arch/loongarch/include/asm/orc_header.h | 18 +
> arch/loongarch/include/asm/orc_lookup.h | 31 ++
> arch/loongarch/include/asm/orc_types.h | 58 ++
> arch/loongarch/include/asm/stackframe.h | 3 +
> arch/loongarch/include/asm/thread_info.h | 2 +
> arch/loongarch/include/asm/unwind.h | 20 +-
> arch/loongarch/include/asm/unwind_hints.h | 28 +
> arch/loongarch/kernel/Makefile | 4 +
> arch/loongarch/kernel/entry.S | 5 +
> arch/loongarch/kernel/fpu.S | 7 +
> arch/loongarch/kernel/genex.S | 6 +
> arch/loongarch/kernel/lbt.S | 2 +
> arch/loongarch/kernel/mcount_dyn.S | 6 +
> arch/loongarch/kernel/module.c | 22 +-
> arch/loongarch/kernel/relocate_kernel.S | 8 +-
> arch/loongarch/kernel/rethook_trampoline.S | 1 +
> arch/loongarch/kernel/setup.c | 2 +
> arch/loongarch/kernel/stacktrace.c | 42 ++
> arch/loongarch/kernel/traps.c | 42 +-
> arch/loongarch/kernel/unwind_orc.c | 516 ++++++++++++++++++
> arch/loongarch/kernel/vmlinux.lds.S | 3 +
> arch/loongarch/kvm/switch.S | 9 +-
> arch/loongarch/lib/clear_user.S | 2 +
> arch/loongarch/lib/copy_user.S | 2 +
> arch/loongarch/lib/memcpy.S | 2 +
> arch/loongarch/lib/memset.S | 2 +
> arch/loongarch/mm/tlb.c | 27 +-
> arch/loongarch/mm/tlbex.S | 9 +
> arch/loongarch/vdso/Makefile | 1 +
> include/linux/compiler.h | 9 +
> scripts/Makefile | 7 +-
> tools/arch/loongarch/include/asm/inst.h | 161 ++++++
> tools/arch/loongarch/include/asm/orc_types.h | 58 ++
> tools/include/linux/bitops.h | 11 +
> tools/objtool/Makefile | 4 +
> tools/objtool/arch/loongarch/Build | 3 +
> tools/objtool/arch/loongarch/decode.c | 356 ++++++++++++
> .../arch/loongarch/include/arch/cfi_regs.h | 22 +
> .../objtool/arch/loongarch/include/arch/elf.h | 30 +
> .../arch/loongarch/include/arch/special.h | 33 ++
> tools/objtool/arch/loongarch/orc.c | 171 ++++++
> tools/objtool/arch/loongarch/special.c | 15 +
> tools/objtool/arch/x86/Build | 1 +
> tools/objtool/arch/x86/orc.c | 188 +++++++
> tools/objtool/check.c | 52 +-
> tools/objtool/include/objtool/elf.h | 1 +
> tools/objtool/include/objtool/orc.h | 14 +
> tools/objtool/orc_dump.c | 69 +--
> tools/objtool/orc_gen.c | 113 +---
> 56 files changed, 2011 insertions(+), 239 deletions(-)
> create mode 100644 arch/loongarch/include/asm/orc_header.h
> create mode 100644 arch/loongarch/include/asm/orc_lookup.h
> create mode 100644 arch/loongarch/include/asm/orc_types.h
> create mode 100644 arch/loongarch/include/asm/unwind_hints.h
> create mode 100644 arch/loongarch/kernel/unwind_orc.c
> create mode 100644 tools/arch/loongarch/include/asm/inst.h
> create mode 100644 tools/arch/loongarch/include/asm/orc_types.h
> create mode 100644 tools/objtool/arch/loongarch/Build
> create mode 100644 tools/objtool/arch/loongarch/decode.c
> create mode 100644 tools/objtool/arch/loongarch/include/arch/cfi_regs.h
> create mode 100644 tools/objtool/arch/loongarch/include/arch/elf.h
> create mode 100644 tools/objtool/arch/loongarch/include/arch/special.h
> create mode 100644 tools/objtool/arch/loongarch/orc.c
> create mode 100644 tools/objtool/arch/loongarch/special.c
> create mode 100644 tools/objtool/arch/x86/orc.c
> create mode 100644 tools/objtool/include/objtool/orc.h
>
> --
> 2.42.0
>