2020-04-28 19:21:44

by Peter Zijlstra

Subject: [PATCH v2 08/14] objtool: Remove INSN_STACK

With the unconditional use of handle_insn_ops(), INSN_STACK has lost
its purpose. Remove it.

Suggested-by: Julien Thierry <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
---
tools/objtool/arch.h | 1 -
tools/objtool/arch/x86/decode.c | 23 -----------------------
tools/objtool/check.c | 3 ---
3 files changed, 27 deletions(-)

--- a/tools/objtool/arch.h
+++ b/tools/objtool/arch.h
@@ -21,7 +21,6 @@ enum insn_type {
INSN_RETURN,
INSN_EXCEPTION_RETURN,
INSN_CONTEXT_SWITCH,
- INSN_STACK,
INSN_BUG,
INSN_NOP,
INSN_STAC,
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -141,7 +141,6 @@ int arch_decode_instruction(const struct
if (rex_w && !rex_b && modrm_mod == 3 && modrm_rm == 4) {

/* add/sub reg, %rsp */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
@@ -154,7 +153,6 @@ int arch_decode_instruction(const struct
case 0x50 ... 0x57:

/* push reg */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[op1 & 0x7][rex_b];
@@ -166,7 +164,6 @@ int arch_decode_instruction(const struct
case 0x58 ... 0x5f:

/* pop reg */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_REG;
@@ -178,7 +175,6 @@ int arch_decode_instruction(const struct
case 0x68:
case 0x6a:
/* push immediate */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
@@ -196,7 +192,6 @@ int arch_decode_instruction(const struct

if (modrm == 0xe4) {
/* and imm, %rsp */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_AND;
op->src.reg = CFI_SP;
@@ -215,7 +210,6 @@ int arch_decode_instruction(const struct
break;

/* add/sub imm, %rsp */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_SP;
@@ -229,7 +223,6 @@ int arch_decode_instruction(const struct
if (rex_w && !rex_r && modrm_mod == 3 && modrm_reg == 4) {

/* mov %rsp, reg */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = CFI_SP;
@@ -242,7 +235,6 @@ int arch_decode_instruction(const struct
if (rex_w && !rex_b && modrm_mod == 3 && modrm_rm == 4) {

/* mov reg, %rsp */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
@@ -258,7 +250,6 @@ int arch_decode_instruction(const struct
(modrm_mod == 1 || modrm_mod == 2) && modrm_rm == 5) {

/* mov reg, disp(%rbp) */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
@@ -270,7 +261,6 @@ int arch_decode_instruction(const struct
} else if (rex_w && !rex_b && modrm_rm == 4 && sib == 0x24) {

/* mov reg, disp(%rsp) */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
@@ -286,7 +276,6 @@ int arch_decode_instruction(const struct
if (rex_w && !rex_b && modrm_mod == 1 && modrm_rm == 5) {

/* mov disp(%rbp), reg */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG_INDIRECT;
op->src.reg = CFI_BP;
@@ -299,7 +288,6 @@ int arch_decode_instruction(const struct
modrm_mod != 3 && modrm_rm == 4) {

/* mov disp(%rsp), reg */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG_INDIRECT;
op->src.reg = CFI_SP;
@@ -314,7 +302,6 @@ int arch_decode_instruction(const struct
case 0x8d:
if (sib == 0x24 && rex_w && !rex_b && !rex_x) {

- *type = INSN_STACK;
ADD_OP(op) {
if (!insn.displacement.value) {
/* lea (%rsp), reg */
@@ -332,7 +319,6 @@ int arch_decode_instruction(const struct
} else if (rex == 0x48 && modrm == 0x65) {

/* lea disp(%rbp), %rsp */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_BP;
@@ -350,7 +336,6 @@ int arch_decode_instruction(const struct
* Restoring rsp back to its original value after a
* stack realignment.
*/
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_R10;
@@ -368,7 +353,6 @@ int arch_decode_instruction(const struct
* Restoring rsp back to its original value after a
* stack realignment.
*/
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_R13;
@@ -382,7 +366,6 @@ int arch_decode_instruction(const struct

case 0x8f:
/* pop to mem */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_MEM;
@@ -395,7 +378,6 @@ int arch_decode_instruction(const struct

case 0x9c:
/* pushf */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSHF;
@@ -404,7 +386,6 @@ int arch_decode_instruction(const struct

case 0x9d:
/* popf */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_POPF;
op->dest.type = OP_DEST_MEM;
@@ -443,7 +424,6 @@ int arch_decode_instruction(const struct
} else if (op2 == 0xa0 || op2 == 0xa8) {

/* push fs/gs */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
@@ -452,7 +432,6 @@ int arch_decode_instruction(const struct
} else if (op2 == 0xa1 || op2 == 0xa9) {

/* pop fs/gs */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_MEM;
@@ -469,7 +448,6 @@ int arch_decode_instruction(const struct
* mov bp, sp
* pop bp
*/
- *type = INSN_STACK;
ADD_OP(op)
op->dest.type = OP_DEST_LEAVE;

@@ -537,7 +515,6 @@ int arch_decode_instruction(const struct
else if (modrm_reg == 6) {

/* push from mem */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2327,9 +2327,6 @@ static int validate_branch(struct objtoo
}
return 0;

- case INSN_STACK:
- break;
-
case INSN_STAC:
if (state.uaccess) {
WARN_FUNC("recursive UACCESS enable", sec, insn->offset);

2020-05-01 18:25:57

by tip-bot2 for Eric Biggers

Subject: [tip: objtool/core] objtool: Remove INSN_STACK

The following commit has been merged into the objtool/core branch of tip:

Commit-ID: b09fb65e863733e192d4825a285b4b4998969ce0
Gitweb: https://git.kernel.org/tip/b09fb65e863733e192d4825a285b4b4998969ce0
Author: Peter Zijlstra <[email protected]>
AuthorDate: Fri, 24 Apr 2020 16:18:58 +02:00
Committer: Peter Zijlstra <[email protected]>
CommitterDate: Thu, 30 Apr 2020 20:14:33 +02:00

objtool: Remove INSN_STACK

With the unconditional use of handle_insn_ops(), INSN_STACK has lost
its purpose. Remove it.

Suggested-by: Julien Thierry <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Miroslav Benes <[email protected]>
Acked-by: Josh Poimboeuf <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
---
tools/objtool/arch.h | 1 -
tools/objtool/arch/x86/decode.c | 23 -----------------------
tools/objtool/check.c | 3 ---
3 files changed, 27 deletions(-)

diff --git a/tools/objtool/arch.h b/tools/objtool/arch.h
index 445b8fa..25dd4a9 100644
--- a/tools/objtool/arch.h
+++ b/tools/objtool/arch.h
@@ -21,7 +21,6 @@ enum insn_type {
INSN_RETURN,
INSN_EXCEPTION_RETURN,
INSN_CONTEXT_SWITCH,
- INSN_STACK,
INSN_BUG,
INSN_NOP,
INSN_STAC,
diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index 97e66c7..e26bedb 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -141,7 +141,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
if (rex_w && !rex_b && modrm_mod == 3 && modrm_rm == 4) {

/* add/sub reg, %rsp */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
@@ -154,7 +153,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
case 0x50 ... 0x57:

/* push reg */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[op1 & 0x7][rex_b];
@@ -166,7 +164,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
case 0x58 ... 0x5f:

/* pop reg */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_REG;
@@ -178,7 +175,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
case 0x68:
case 0x6a:
/* push immediate */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
@@ -196,7 +192,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,

if (modrm == 0xe4) {
/* and imm, %rsp */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_AND;
op->src.reg = CFI_SP;
@@ -215,7 +210,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
break;

/* add/sub imm, %rsp */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_SP;
@@ -229,7 +223,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
if (rex_w && !rex_r && modrm_mod == 3 && modrm_reg == 4) {

/* mov %rsp, reg */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = CFI_SP;
@@ -242,7 +235,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
if (rex_w && !rex_b && modrm_mod == 3 && modrm_rm == 4) {

/* mov reg, %rsp */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
@@ -258,7 +250,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
(modrm_mod == 1 || modrm_mod == 2) && modrm_rm == 5) {

/* mov reg, disp(%rbp) */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
@@ -270,7 +261,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
} else if (rex_w && !rex_b && modrm_rm == 4 && sib == 0x24) {

/* mov reg, disp(%rsp) */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
@@ -286,7 +276,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
if (rex_w && !rex_b && modrm_mod == 1 && modrm_rm == 5) {

/* mov disp(%rbp), reg */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG_INDIRECT;
op->src.reg = CFI_BP;
@@ -299,7 +288,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
modrm_mod != 3 && modrm_rm == 4) {

/* mov disp(%rsp), reg */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_REG_INDIRECT;
op->src.reg = CFI_SP;
@@ -314,7 +302,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
case 0x8d:
if (sib == 0x24 && rex_w && !rex_b && !rex_x) {

- *type = INSN_STACK;
ADD_OP(op) {
if (!insn.displacement.value) {
/* lea (%rsp), reg */
@@ -332,7 +319,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
} else if (rex == 0x48 && modrm == 0x65) {

/* lea disp(%rbp), %rsp */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_BP;
@@ -350,7 +336,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
* Restoring rsp back to its original value after a
* stack realignment.
*/
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_R10;
@@ -368,7 +353,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
* Restoring rsp back to its original value after a
* stack realignment.
*/
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_R13;
@@ -382,7 +366,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,

case 0x8f:
/* pop to mem */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_MEM;
@@ -395,7 +378,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,

case 0x9c:
/* pushf */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSHF;
@@ -404,7 +386,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,

case 0x9d:
/* popf */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_POPF;
op->dest.type = OP_DEST_MEM;
@@ -443,7 +424,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
} else if (op2 == 0xa0 || op2 == 0xa8) {

/* push fs/gs */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
@@ -452,7 +432,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
} else if (op2 == 0xa1 || op2 == 0xa9) {

/* pop fs/gs */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_MEM;
@@ -469,7 +448,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
* mov bp, sp
* pop bp
*/
- *type = INSN_STACK;
ADD_OP(op)
op->dest.type = OP_DEST_LEAVE;

@@ -537,7 +515,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
else if (modrm_reg == 6) {

/* push from mem */
- *type = INSN_STACK;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 6591c2d..4f3db2f 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2339,9 +2339,6 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
}
return 0;

- case INSN_STACK:
- break;
-
case INSN_STAC:
if (state.uaccess) {
WARN_FUNC("recursive UACCESS enable", sec, insn->offset);