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[23.128.96.18]) by mx.google.com with ESMTP id u16si5671251ilb.175.2021.09.17.05.10.51; Fri, 17 Sep 2021 05:11:03 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244467AbhIQEIT (ORCPT + 99 others); Fri, 17 Sep 2021 00:08:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:51880 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233017AbhIQEGM (ORCPT ); Fri, 17 Sep 2021 00:06:12 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 19AAD60F5B; Fri, 17 Sep 2021 04:04:46 +0000 (UTC) From: Huacai Chen To: Arnd Bergmann , Andy Lutomirski , Thomas Gleixner , Peter Zijlstra , Andrew Morton , David Airlie , Jonathan Corbet , Linus Torvalds Cc: linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Xuefeng Li , Yanteng Si , Huacai Chen , Jiaxun Yang , Huacai Chen Subject: [PATCH V3 15/22] LoongArch: Add elf and module support Date: Fri, 17 Sep 2021 11:57:29 +0800 Message-Id: <20210917035736.3934017-16-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210917035736.3934017-1-chenhuacai@loongson.cn> References: <20210917035736.3934017-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds elf definition and module relocate codes. Signed-off-by: Huacai Chen --- arch/loongarch/include/asm/cpufeature.h | 24 + arch/loongarch/include/asm/elf.h | 308 +++++++++++ arch/loongarch/include/asm/exec.h | 10 + arch/loongarch/include/asm/module.h | 15 + arch/loongarch/include/asm/vermagic.h | 19 + arch/loongarch/include/uapi/asm/auxvec.h | 17 + arch/loongarch/include/uapi/asm/hwcap.h | 20 + arch/loongarch/kernel/elf.c | 41 ++ arch/loongarch/kernel/module.c | 652 +++++++++++++++++++++++ 9 files changed, 1106 insertions(+) create mode 100644 arch/loongarch/include/asm/cpufeature.h create mode 100644 arch/loongarch/include/asm/elf.h create mode 100644 arch/loongarch/include/asm/exec.h create mode 100644 arch/loongarch/include/asm/module.h create mode 100644 arch/loongarch/include/asm/vermagic.h create mode 100644 arch/loongarch/include/uapi/asm/auxvec.h create mode 100644 arch/loongarch/include/uapi/asm/hwcap.h create mode 100644 arch/loongarch/kernel/elf.c create mode 100644 arch/loongarch/kernel/module.c diff --git a/arch/loongarch/include/asm/cpufeature.h b/arch/loongarch/include/asm/cpufeature.h new file mode 100644 index 000000000000..7e4c6a769830 --- /dev/null +++ b/arch/loongarch/include/asm/cpufeature.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * CPU feature definitions for module loading, used by + * module_cpu_feature_match(), see uapi/asm/hwcap.h for LoongArch CPU features. + * + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited + */ + +#ifndef __ASM_CPUFEATURE_H +#define __ASM_CPUFEATURE_H + +#include +#include + +#define MAX_CPU_FEATURES (8 * sizeof(elf_hwcap)) + +#define cpu_feature(x) ilog2(HWCAP_ ## x) + +static inline bool cpu_have_feature(unsigned int num) +{ + return elf_hwcap & (1UL << num); +} + +#endif /* __ASM_CPUFEATURE_H */ diff --git a/arch/loongarch/include/asm/elf.h b/arch/loongarch/include/asm/elf.h new file mode 100644 index 000000000000..9f8c2ab1a206 --- /dev/null +++ b/arch/loongarch/include/asm/elf.h @@ -0,0 +1,308 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited + */ +#ifndef _ASM_ELF_H +#define _ASM_ELF_H + +#include +#include +#include + +#include + +#include + +/* ELF header e_flags defines. */ + +/* The ABI of a file. */ +#define EF_LARCH_ABI_LP32 0x00000001 /* LP32 ABI. */ +#define EF_LARCH_ABI_LPX32 0x00000002 /* LPX32 ABI */ +#define EF_LARCH_ABI_LP64 0x00000003 /* LP64 ABI */ +#define EF_LARCH_ABI 0x00000003 + +/* LoongArch relocation types used by the dynamic linker */ +#define R_LARCH_NONE 0 +#define R_LARCH_32 1 +#define R_LARCH_64 2 +#define R_LARCH_RELATIVE 3 +#define R_LARCH_COPY 4 +#define R_LARCH_JUMP_SLOT 5 +#define R_LARCH_TLS_DTPMOD32 6 +#define R_LARCH_TLS_DTPMOD64 7 +#define R_LARCH_TLS_DTPREL32 8 +#define R_LARCH_TLS_DTPREL64 9 +#define R_LARCH_TLS_TPREL32 10 +#define R_LARCH_TLS_TPREL64 11 +#define R_LARCH_IRELATIVE 12 +#define R_LARCH_MARK_LA 20 +#define R_LARCH_MARK_PCREL 21 +#define R_LARCH_SOP_PUSH_PCREL 22 +#define R_LARCH_SOP_PUSH_ABSOLUTE 23 +#define R_LARCH_SOP_PUSH_DUP 24 +#define R_LARCH_SOP_PUSH_GPREL 25 +#define R_LARCH_SOP_PUSH_TLS_TPREL 26 +#define R_LARCH_SOP_PUSH_TLS_GOT 27 +#define R_LARCH_SOP_PUSH_TLS_GD 28 +#define R_LARCH_SOP_PUSH_PLT_PCREL 29 +#define R_LARCH_SOP_ASSERT 30 +#define R_LARCH_SOP_NOT 31 +#define R_LARCH_SOP_SUB 32 +#define R_LARCH_SOP_SL 33 +#define R_LARCH_SOP_SR 34 +#define R_LARCH_SOP_ADD 35 +#define R_LARCH_SOP_AND 36 +#define R_LARCH_SOP_IF_ELSE 37 +#define R_LARCH_SOP_POP_32_S_10_5 38 +#define R_LARCH_SOP_POP_32_U_10_12 39 +#define R_LARCH_SOP_POP_32_S_10_12 40 +#define R_LARCH_SOP_POP_32_S_10_16 41 +#define R_LARCH_SOP_POP_32_S_10_16_S2 42 +#define R_LARCH_SOP_POP_32_S_5_20 43 +#define R_LARCH_SOP_POP_32_S_0_5_10_16_S2 44 +#define R_LARCH_SOP_POP_32_S_0_10_10_16_S2 45 +#define R_LARCH_SOP_POP_32_U 46 +#define R_LARCH_ADD8 47 +#define R_LARCH_ADD16 48 +#define R_LARCH_ADD24 49 +#define R_LARCH_ADD32 50 +#define R_LARCH_ADD64 51 +#define R_LARCH_SUB8 52 +#define R_LARCH_SUB16 53 +#define R_LARCH_SUB24 54 +#define R_LARCH_SUB32 55 +#define R_LARCH_SUB64 56 +#define R_LARCH_GNU_VTINHERIT 57 +#define R_LARCH_GNU_VTENTRY 58 + +#ifndef ELF_ARCH + +/* ELF register definitions */ + +/* + * General purpose have the following registers: + * Register Number + * GPRs 32 + * EPC 1 + * BADVADDR 1 + * CRMD 1 + * PRMD 1 + * EUEN 1 + * ECFG 1 + * ESTAT 1 + * Reserved 6 + */ +#define ELF_NGREG 45 + +/* + * Floating point have the following registers: + * Register Number + * FPR 32 + * FCC 1 + * FCSR 1 + */ +#define ELF_NFPREG 34 + +typedef unsigned long elf_greg_t; +typedef elf_greg_t elf_gregset_t[ELF_NGREG]; + +typedef double elf_fpreg_t; +typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG]; + +void loongarch_dump_regs64(u64 *uregs, const struct pt_regs *regs); + +#ifdef CONFIG_32BIT +/* + * This is used to ensure we don't load something for the wrong architecture. + */ +#define elf_check_arch elf32_check_arch + +/* + * These are used to set parameters in the core dumps. + */ +#define ELF_CLASS ELFCLASS32 + +#define ELF_CORE_COPY_REGS(dest, regs) \ + loongarch_dump_regs32((u32 *)&(dest), (regs)); + +#endif /* CONFIG_32BIT */ + +#ifdef CONFIG_64BIT +/* + * This is used to ensure we don't load something for the wrong architecture. + */ +#define elf_check_arch elf64_check_arch + +/* + * These are used to set parameters in the core dumps. + */ +#define ELF_CLASS ELFCLASS64 + +#define ELF_CORE_COPY_REGS(dest, regs) \ + loongarch_dump_regs64((u64 *)&(dest), (regs)); + +#endif /* CONFIG_64BIT */ + +/* + * These are used to set parameters in the core dumps. + */ +#define ELF_DATA ELFDATA2LSB +#define ELF_ARCH EM_LOONGARCH + +#endif /* !defined(ELF_ARCH) */ + +#define loongarch_elf_check_machine(x) ((x)->e_machine == EM_LOONGARCH) + +#define vmcore_elf32_check_arch loongarch_elf_check_machine +#define vmcore_elf64_check_arch loongarch_elf_check_machine + +/* + * Return non-zero if HDR identifies an 32bit ELF binary. + */ +#define elf32_check_arch(hdr) \ +({ \ + int __res = 1; \ + struct elfhdr *__h = (hdr); \ + \ + if (!loongarch_elf_check_machine(__h)) \ + __res = 0; \ + if (__h->e_ident[EI_CLASS] != ELFCLASS32) \ + __res = 0; \ + \ + __res; \ +}) + +/* + * Return non-zero if HDR identifies an 64bit ELF binary. + */ +#define elf64_check_arch(hdr) \ +({ \ + int __res = 1; \ + struct elfhdr *__h = (hdr); \ + \ + if (!loongarch_elf_check_machine(__h)) \ + __res = 0; \ + if (__h->e_ident[EI_CLASS] != ELFCLASS64) \ + __res = 0; \ + \ + __res; \ +}) + +struct loongarch_abi; +extern struct loongarch_abi loongarch_abi; + +#ifdef CONFIG_32BIT + +#define SET_PERSONALITY2(ex, state) \ +do { \ + current->thread.abi = &loongarch_abi; \ + \ + loongarch_set_personality_fcsr(state); \ + \ + if (personality(current->personality) != PER_LINUX) \ + set_personality(PER_LINUX); \ +} while (0) + +#endif /* CONFIG_32BIT */ + +#ifdef CONFIG_64BIT + +#define SET_PERSONALITY2(ex, state) \ +do { \ + unsigned int p; \ + \ + clear_thread_flag(TIF_32BIT_REGS); \ + clear_thread_flag(TIF_32BIT_ADDR); \ + \ + current->thread.abi = &loongarch_abi; \ + loongarch_set_personality_fcsr(state); \ + \ + p = personality(current->personality); \ + if (p != PER_LINUX32 && p != PER_LINUX) \ + set_personality(PER_LINUX); \ +} while (0) + +#endif /* CONFIG_64BIT */ + +#define CORE_DUMP_USE_REGSET +#define ELF_EXEC_PAGESIZE PAGE_SIZE + +/* + * This yields a mask that user programs can use to figure out what + * instruction set this cpu supports. This could be done in userspace, + * but it's not easy, and we've already done it here. + */ + +#define ELF_HWCAP (elf_hwcap) +extern unsigned int elf_hwcap; +#include + +/* + * This yields a string that ld.so will use to load implementation + * specific libraries for optimization. This is more specific in + * intent than poking at uname or /proc/cpuinfo. + */ + +#define ELF_PLATFORM __elf_platform +extern const char *__elf_platform; + +/* The regs[11] (a7) holds the syscall number and should not cleared */ +#define ELF_PLAT_INIT(_r, load_addr) do { \ + _r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0; \ + _r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0; \ + _r->regs[9] = _r->regs[10] = _r->regs[12] = _r->regs[13] = 0; \ + _r->regs[14] = _r->regs[15] = _r->regs[16] = _r->regs[17] = 0; \ + _r->regs[18] = _r->regs[19] = _r->regs[20] = _r->regs[21] = 0; \ + _r->regs[22] = _r->regs[23] = _r->regs[24] = _r->regs[25] = 0; \ + _r->regs[26] = _r->regs[27] = _r->regs[28] = _r->regs[29] = 0; \ + _r->regs[30] = _r->regs[31] = 0; \ +} while (0) + +/* + * This is the location that an ET_DYN program is loaded if exec'ed. Typical + * use of this is to invoke "./ld.so someprog" to test out a new version of + * the loader. We need to make sure that it is out of the way of the program + * that it will "exec", and that there is sufficient room for the brk. + */ + +#ifndef ELF_ET_DYN_BASE +#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2) +#endif + +/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ +#define ARCH_DLINFO \ +do { \ + NEW_AUX_ENT(AT_SYSINFO_EHDR, \ + (unsigned long)current->mm->context.vdso); \ +} while (0) + +#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 +struct linux_binprm; +extern int arch_setup_additional_pages(struct linux_binprm *bprm, + int uses_interp); + +struct arch_elf_state { + int fp_abi; + int interp_fp_abi; +}; + +#define LOONGARCH_ABI_FP_ANY (0) + +#define INIT_ARCH_ELF_STATE { \ + .fp_abi = LOONGARCH_ABI_FP_ANY, \ + .interp_fp_abi = LOONGARCH_ABI_FP_ANY, \ +} + + +extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf, + bool is_interp, struct arch_elf_state *state); + +extern int arch_check_elf(void *ehdr, bool has_interpreter, void *interp_ehdr, + struct arch_elf_state *state); + +extern void loongarch_set_personality_fcsr(struct arch_elf_state *state); + +#define elf_read_implies_exec(ex, stk) loongarch_elf_read_implies_exec(&(ex), stk) +extern int loongarch_elf_read_implies_exec(void *elf_ex, int exstack); + +#endif /* _ASM_ELF_H */ diff --git a/arch/loongarch/include/asm/exec.h b/arch/loongarch/include/asm/exec.h new file mode 100644 index 000000000000..00df07ce3529 --- /dev/null +++ b/arch/loongarch/include/asm/exec.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited + */ +#ifndef _ASM_EXEC_H +#define _ASM_EXEC_H + +extern unsigned long arch_align_stack(unsigned long sp); + +#endif /* _ASM_EXEC_H */ diff --git a/arch/loongarch/include/asm/module.h b/arch/loongarch/include/asm/module.h new file mode 100644 index 000000000000..6df72c6228e0 --- /dev/null +++ b/arch/loongarch/include/asm/module.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited + */ +#ifndef _ASM_MODULE_H +#define _ASM_MODULE_H + +#include + +#define RELA_STACK_DEPTH 16 + +struct mod_arch_specific { +}; + +#endif /* _ASM_MODULE_H */ diff --git a/arch/loongarch/include/asm/vermagic.h b/arch/loongarch/include/asm/vermagic.h new file mode 100644 index 000000000000..9882dfd4702a --- /dev/null +++ b/arch/loongarch/include/asm/vermagic.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited + */ +#ifndef _ASM_VERMAGIC_H +#define _ASM_VERMAGIC_H + +#define MODULE_PROC_FAMILY "LOONGARCH " + +#ifdef CONFIG_32BIT +#define MODULE_KERNEL_TYPE "32BIT " +#elif defined CONFIG_64BIT +#define MODULE_KERNEL_TYPE "64BIT " +#endif + +#define MODULE_ARCH_VERMAGIC \ + MODULE_PROC_FAMILY MODULE_KERNEL_TYPE + +#endif /* _ASM_VERMAGIC_H */ diff --git a/arch/loongarch/include/uapi/asm/auxvec.h b/arch/loongarch/include/uapi/asm/auxvec.h new file mode 100644 index 000000000000..5a2200fd75bf --- /dev/null +++ b/arch/loongarch/include/uapi/asm/auxvec.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ +/* + * Author: Hanlu Li + * Huacai Chen + * + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited + */ + +#ifndef __ASM_AUXVEC_H +#define __ASM_AUXVEC_H + +/* Location of VDSO image. */ +#define AT_SYSINFO_EHDR 33 + +#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */ + +#endif /* __ASM_AUXVEC_H */ diff --git a/arch/loongarch/include/uapi/asm/hwcap.h b/arch/loongarch/include/uapi/asm/hwcap.h new file mode 100644 index 000000000000..8840b72fa8e8 --- /dev/null +++ b/arch/loongarch/include/uapi/asm/hwcap.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI_ASM_HWCAP_H +#define _UAPI_ASM_HWCAP_H + +/* HWCAP flags */ +#define HWCAP_LOONGARCH_CPUCFG (1 << 0) +#define HWCAP_LOONGARCH_LAM (1 << 1) +#define HWCAP_LOONGARCH_UAL (1 << 2) +#define HWCAP_LOONGARCH_FPU (1 << 3) +#define HWCAP_LOONGARCH_LSX (1 << 4) +#define HWCAP_LOONGARCH_LASX (1 << 5) +#define HWCAP_LOONGARCH_CRC32 (1 << 6) +#define HWCAP_LOONGARCH_COMPLEX (1 << 7) +#define HWCAP_LOONGARCH_CRYPTO (1 << 8) +#define HWCAP_LOONGARCH_LVZ (1 << 9) +#define HWCAP_LOONGARCH_LBT_X86 (1 << 10) +#define HWCAP_LOONGARCH_LBT_ARM (1 << 11) +#define HWCAP_LOONGARCH_LBT_MIPS (1 << 12) + +#endif /* _UAPI_ASM_HWCAP_H */ diff --git a/arch/loongarch/kernel/elf.c b/arch/loongarch/kernel/elf.c new file mode 100644 index 000000000000..072dfd40f0b5 --- /dev/null +++ b/arch/loongarch/kernel/elf.c @@ -0,0 +1,41 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author: Huacai Chen + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited + */ + +#include +#include +#include +#include + +#include +#include + +int arch_elf_pt_proc(void *_ehdr, void *_phdr, struct file *elf, + bool is_interp, struct arch_elf_state *state) +{ + return 0; +} + +int arch_check_elf(void *_ehdr, bool has_interpreter, void *_interp_ehdr, + struct arch_elf_state *state) +{ + return 0; +} + +void loongarch_set_personality_fcsr(struct arch_elf_state *state) +{ + current->thread.fpu.fcsr = boot_cpu_data.fpu_csr0; +} + +int loongarch_elf_read_implies_exec(void *elf_ex, int exstack) +{ + if (exstack != EXSTACK_DISABLE_X) { + /* The binary doesn't request a non-executable stack */ + return 1; + } + + return 0; +} +EXPORT_SYMBOL(loongarch_elf_read_implies_exec); diff --git a/arch/loongarch/kernel/module.c b/arch/loongarch/kernel/module.c new file mode 100644 index 000000000000..af7c403b032b --- /dev/null +++ b/arch/loongarch/kernel/module.c @@ -0,0 +1,652 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Author: Hanlu Li + * Huacai Chen + * + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited + */ + +#undef DEBUG + +#include +#include +#include +#include +#include +#include +#include +#include + +static int rela_stack_push(s64 stack_value, s64 *rela_stack, size_t *rela_stack_top) +{ + if (*rela_stack_top >= RELA_STACK_DEPTH) + return -ENOEXEC; + + rela_stack[(*rela_stack_top)++] = stack_value; + pr_debug("%s stack_value = 0x%llx\n", __func__, stack_value); + + return 0; +} + +static int rela_stack_pop(s64 *stack_value, s64 *rela_stack, size_t *rela_stack_top) +{ + if (*rela_stack_top == 0) + return -ENOEXEC; + + *stack_value = rela_stack[--(*rela_stack_top)]; + pr_debug("%s stack_value = 0x%llx\n", __func__, *stack_value); + + return 0; +} + +static int apply_r_larch_none(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + return 0; +} + +static int apply_r_larch_32(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + *location = v; + return 0; +} + +static int apply_r_larch_64(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + *(Elf_Addr *)location = v; + return 0; +} + +static int apply_r_larch_mark_la(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + return 0; +} + +static int apply_r_larch_mark_pcrel(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + return 0; +} + +static int apply_r_larch_sop_push_pcrel(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + return rela_stack_push(v - (u64)location, rela_stack, rela_stack_top); +} + +static int apply_r_larch_sop_push_absolute(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + return rela_stack_push(v, rela_stack, rela_stack_top); +} + +static int apply_r_larch_sop_push_dup(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1; + + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_push(opr1, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_push(opr1, rela_stack, rela_stack_top); + if (err) + return err; + + return 0; +} + +static int apply_r_larch_sop_push_plt_pcrel(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + return apply_r_larch_sop_push_pcrel(me, location, v, rela_stack, rela_stack_top); +} + +static int apply_r_larch_sop_sub(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1, opr2; + + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_push(opr1 - opr2, rela_stack, rela_stack_top); + if (err) + return err; + + return 0; +} + +static int apply_r_larch_sop_sl(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1, opr2; + + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_push(opr1 << opr2, rela_stack, rela_stack_top); + if (err) + return err; + + return 0; +} + +static int apply_r_larch_sop_sr(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1, opr2; + + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_push(opr1 >> opr2, rela_stack, rela_stack_top); + if (err) + return err; + + return 0; +} + +static int apply_r_larch_sop_add(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1, opr2; + + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_push(opr1 + opr2, rela_stack, rela_stack_top); + if (err) + return err; + + return 0; +} +static int apply_r_larch_sop_and(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1, opr2; + + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_push(opr1 & opr2, rela_stack, rela_stack_top); + if (err) + return err; + + return 0; +} + +static int apply_r_larch_sop_if_else(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1, opr2, opr3; + + err = rela_stack_pop(&opr3, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + err = rela_stack_push(opr1 ? opr2 : opr3, rela_stack, rela_stack_top); + if (err) + return err; + + return 0; +} + +static int apply_r_larch_sop_pop_32_s_10_5(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1; + + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + + /* check 5-bit signed */ + if ((opr1 & ~(u64)0xf) && + (opr1 & ~(u64)0xf) != ~(u64)0xf) { + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + /* (*(uint32_t *) PC) [14 ... 10] = opr [4 ... 0] */ + *location = (*location & (~(u32)0x7c00)) | ((opr1 & 0x1f) << 10); + + return 0; +} + +static int apply_r_larch_sop_pop_32_u_10_12(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1; + + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + + /* check 12-bit unsigned */ + if (opr1 & ~(u64)0xfff) { + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + /* (*(uint32_t *) PC) [21 ... 10] = opr [11 ... 0] */ + *location = (*location & (~(u32)0x3ffc00)) | ((opr1 & 0xfff) << 10); + + return 0; +} + +static int apply_r_larch_sop_pop_32_s_10_12(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1; + + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + + /* check 12-bit signed */ + if ((opr1 & ~(u64)0x7ff) && + (opr1 & ~(u64)0x7ff) != ~(u64)0x7ff) { + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + /* (*(uint32_t *) PC) [21 ... 10] = opr [11 ... 0] */ + *location = (*location & (~(u32)0x3ffc00)) | ((opr1 & 0xfff) << 10); + + return 0; +} + +static int apply_r_larch_sop_pop_32_s_10_16(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1; + + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + + /* check 16-bit signed */ + if ((opr1 & ~(u64)0x7fff) && + (opr1 & ~(u64)0x7fff) != ~(u64)0x7fff) { + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + /* (*(uint32_t *) PC) [25 ... 10] = opr [15 ... 0] */ + *location = (*location & 0xfc0003ff) | ((opr1 & 0xffff) << 10); + + return 0; +} + +static int apply_r_larch_sop_pop_32_s_10_16_s2(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1; + + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + + /* check 4-aligned */ + if (opr1 % 4) { + pr_err("module %s: opr1 = 0x%llx unaligned! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + opr1 >>= 2; + /* check 18-bit signed */ + if ((opr1 & ~(u64)0x7fff) && + (opr1 & ~(u64)0x7fff) != ~(u64)0x7fff) { + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + /* (*(uint32_t *) PC) [25 ... 10] = opr [17 ... 2] */ + *location = (*location & 0xfc0003ff) | ((opr1 & 0xffff) << 10); + + return 0; +} + +static int apply_r_larch_sop_pop_32_s_5_20(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1; + + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + + /* check 20-bit signed */ + if ((opr1 & ~(u64)0x7ffff) && + (opr1 & ~(u64)0x7ffff) != ~(u64)0x7ffff) { + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + /* (*(uint32_t *) PC) [24 ... 5] = opr [19 ... 0] */ + *location = (*location & (~(u32)0x1ffffe0)) | ((opr1 & 0xfffff) << 5); + + return 0; +} + +static int apply_r_larch_sop_pop_32_s_0_5_10_16_s2(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1; + + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + + /* check 4-aligned */ + if (opr1 % 4) { + pr_err("module %s: opr1 = 0x%llx unaligned! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + opr1 >>= 2; + /* check 23-bit signed */ + if ((opr1 & ~(u64)0xfffff) && + (opr1 & ~(u64)0xfffff) != ~(u64)0xfffff) { + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + /* + * (*(uint32_t *) PC) [4 ... 0] = opr [22 ... 18] + * (*(uint32_t *) PC) [25 ... 10] = opr [17 ... 2] + */ + *location = (*location & 0xfc0003e0) + | ((opr1 & 0x1f0000) >> 16) | ((opr1 & 0xffff) << 10); + + return 0; +} + +static int apply_r_larch_sop_pop_32_s_0_10_10_16_s2(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1; + + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + + /* check 4-aligned */ + if (opr1 % 4) { + pr_err("module %s: opr1 = 0x%llx unaligned! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + opr1 >>= 2; + /* check 28-bit signed */ + if ((opr1 & ~(u64)0x1ffffff) && + (opr1 & ~(u64)0x1ffffff) != ~(u64)0x1ffffff) { + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + /* + * (*(uint32_t *) PC) [9 ... 0] = opr [27 ... 18] + * (*(uint32_t *) PC) [25 ... 10] = opr [17 ... 2] + */ + *location = (*location & 0xfc000000) + | ((opr1 & 0x3ff0000) >> 16) | ((opr1 & 0xffff) << 10); + + return 0; +} + +static int apply_r_larch_sop_pop_32_u(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + int err = 0; + s64 opr1; + + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); + if (err) + return err; + + /* check 32-bit unsigned */ + if (opr1 & ~(u64)0xffffffff) { + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", + me->name, opr1, __func__); + return -ENOEXEC; + } + + /* (*(uint32_t *) PC) = opr */ + *location = (u32)opr1; + + return 0; +} + +static int apply_r_larch_add32(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + *(s32 *)location += v; + return 0; +} + +static int apply_r_larch_add64(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + *(s64 *)location += v; + return 0; +} + +static int apply_r_larch_sub32(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + *(s32 *)location -= v; + return 0; +} + +static int apply_r_larch_sub64(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top) +{ + *(s64 *)location -= v; + return 0; +} + +/* + * reloc_handlers_rela() - Apply a particular relocation to a module + * @me: the module to apply the reloc to + * @location: the address at which the reloc is to be applied + * @v: the value of the reloc, with addend for RELA-style + * @rela_stack: the stack used for store relocation info, LOCAL to THIS module + * @rela_stac_top: where the stack operation(pop/push) applies to + * + * Return: 0 upon success, else -ERRNO + */ +typedef int (*reloc_rela_handler)(struct module *me, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top); + +/* The handlers for known reloc types */ +static reloc_rela_handler reloc_rela_handlers[] = { + [R_LARCH_NONE] = apply_r_larch_none, + [R_LARCH_32] = apply_r_larch_32, + [R_LARCH_64] = apply_r_larch_64, + [R_LARCH_MARK_LA] = apply_r_larch_mark_la, + [R_LARCH_MARK_PCREL] = apply_r_larch_mark_pcrel, + [R_LARCH_SOP_PUSH_PCREL] = apply_r_larch_sop_push_pcrel, + [R_LARCH_SOP_PUSH_ABSOLUTE] = apply_r_larch_sop_push_absolute, + [R_LARCH_SOP_PUSH_DUP] = apply_r_larch_sop_push_dup, + [R_LARCH_SOP_PUSH_PLT_PCREL] = apply_r_larch_sop_push_plt_pcrel, + [R_LARCH_SOP_SUB] = apply_r_larch_sop_sub, + [R_LARCH_SOP_SL] = apply_r_larch_sop_sl, + [R_LARCH_SOP_SR] = apply_r_larch_sop_sr, + [R_LARCH_SOP_ADD] = apply_r_larch_sop_add, + [R_LARCH_SOP_AND] = apply_r_larch_sop_and, + [R_LARCH_SOP_IF_ELSE] = apply_r_larch_sop_if_else, + [R_LARCH_SOP_POP_32_S_10_5] = apply_r_larch_sop_pop_32_s_10_5, + [R_LARCH_SOP_POP_32_U_10_12] = apply_r_larch_sop_pop_32_u_10_12, + [R_LARCH_SOP_POP_32_S_10_12] = apply_r_larch_sop_pop_32_s_10_12, + [R_LARCH_SOP_POP_32_S_10_16] = apply_r_larch_sop_pop_32_s_10_16, + [R_LARCH_SOP_POP_32_S_10_16_S2] = apply_r_larch_sop_pop_32_s_10_16_s2, + [R_LARCH_SOP_POP_32_S_5_20] = apply_r_larch_sop_pop_32_s_5_20, + [R_LARCH_SOP_POP_32_S_0_5_10_16_S2] = apply_r_larch_sop_pop_32_s_0_5_10_16_s2, + [R_LARCH_SOP_POP_32_S_0_10_10_16_S2] = apply_r_larch_sop_pop_32_s_0_10_10_16_s2, + [R_LARCH_SOP_POP_32_U] = apply_r_larch_sop_pop_32_u, + [R_LARCH_ADD32] = apply_r_larch_add32, + [R_LARCH_ADD64] = apply_r_larch_add64, + [R_LARCH_SUB32] = apply_r_larch_sub32, + [R_LARCH_SUB64] = apply_r_larch_sub64, +}; + +int apply_relocate(Elf_Shdr *sechdrs, const char *strtab, + unsigned int symindex, unsigned int relsec, + struct module *me) +{ + int i, err; + unsigned int type; + s64 rela_stack[RELA_STACK_DEPTH]; + size_t rela_stack_top = 0; + reloc_rela_handler handler; + void *location; + Elf_Addr v; + Elf_Sym *sym; + Elf_Rel *rel = (void *) sechdrs[relsec].sh_addr; + + pr_debug("%s: Applying relocate section %u to %u\n", __func__, relsec, + sechdrs[relsec].sh_info); + + rela_stack_top = 0; + for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { + /* This is where to make the change */ + location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[i].r_offset; + /* This is the symbol it is referring to */ + sym = (Elf_Sym *)sechdrs[symindex].sh_addr + ELF_R_SYM(rel[i].r_info); + if (IS_ERR_VALUE(sym->st_value)) { + /* Ignore unresolved weak symbol */ + if (ELF_ST_BIND(sym->st_info) == STB_WEAK) + continue; + pr_warn("%s: Unknown symbol %s\n", me->name, strtab + sym->st_name); + return -ENOENT; + } + + type = ELF_R_TYPE(rel[i].r_info); + + if (type < ARRAY_SIZE(reloc_rela_handlers)) + handler = reloc_rela_handlers[type]; + else + handler = NULL; + + if (!handler) { + pr_err("%s: Unknown relocation type %u\n", me->name, type); + return -EINVAL; + } + + v = sym->st_value; + err = handler(me, location, v, rela_stack, &rela_stack_top); + if (err) + return err; + } + + return 0; +} + +int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, + unsigned int symindex, unsigned int relsec, + struct module *me) +{ + int i, err; + unsigned int type; + s64 rela_stack[RELA_STACK_DEPTH]; + size_t rela_stack_top = 0; + reloc_rela_handler handler; + void *location; + Elf_Addr v; + Elf_Sym *sym; + Elf_Rela *rel = (void *) sechdrs[relsec].sh_addr; + + pr_debug("%s: Applying relocate section %u to %u\n", __func__, relsec, + sechdrs[relsec].sh_info); + + rela_stack_top = 0; + for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { + /* This is where to make the change */ + location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[i].r_offset; + /* This is the symbol it is referring to */ + sym = (Elf_Sym *)sechdrs[symindex].sh_addr + ELF_R_SYM(rel[i].r_info); + if (IS_ERR_VALUE(sym->st_value)) { + /* Ignore unresolved weak symbol */ + if (ELF_ST_BIND(sym->st_info) == STB_WEAK) + continue; + pr_warn("%s: Unknown symbol %s\n", me->name, strtab + sym->st_name); + return -ENOENT; + } + + type = ELF_R_TYPE(rel[i].r_info); + + if (type < ARRAY_SIZE(reloc_rela_handlers)) + handler = reloc_rela_handlers[type]; + else + handler = NULL; + + if (!handler) { + pr_err("%s: Unknown relocation type %u\n", me->name, type); + return -EINVAL; + } + + pr_debug("type %d st_value %llx r_addend %llx loc %llx\n", + (int)ELF64_R_TYPE(rel[i].r_info), + sym->st_value, rel[i].r_addend, (u64)location); + + v = sym->st_value + rel[i].r_addend; + err = handler(me, location, v, rela_stack, &rela_stack_top); + if (err) + return err; + } + + return 0; +} -- 2.27.0