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/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2012 ARM Ltd. |
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*/ |
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#ifndef __ASM_ELF_H |
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#define __ASM_ELF_H |
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#include <asm/hwcap.h> |
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/* |
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* ELF register definitions.. |
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*/ |
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#include <asm/ptrace.h> |
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#include <asm/user.h> |
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/* |
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* AArch64 static relocation types. |
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*/ |
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/* Miscellaneous. */ |
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#define R_ARM_NONE 0 |
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#define R_AARCH64_NONE 256 |
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/* Data. */ |
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#define R_AARCH64_ABS64 257 |
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#define R_AARCH64_ABS32 258 |
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#define R_AARCH64_ABS16 259 |
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#define R_AARCH64_PREL64 260 |
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#define R_AARCH64_PREL32 261 |
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#define R_AARCH64_PREL16 262 |
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/* Instructions. */ |
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#define R_AARCH64_MOVW_UABS_G0 263 |
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#define R_AARCH64_MOVW_UABS_G0_NC 264 |
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#define R_AARCH64_MOVW_UABS_G1 265 |
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#define R_AARCH64_MOVW_UABS_G1_NC 266 |
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#define R_AARCH64_MOVW_UABS_G2 267 |
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#define R_AARCH64_MOVW_UABS_G2_NC 268 |
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#define R_AARCH64_MOVW_UABS_G3 269 |
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#define R_AARCH64_MOVW_SABS_G0 270 |
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#define R_AARCH64_MOVW_SABS_G1 271 |
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#define R_AARCH64_MOVW_SABS_G2 272 |
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#define R_AARCH64_LD_PREL_LO19 273 |
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#define R_AARCH64_ADR_PREL_LO21 274 |
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#define R_AARCH64_ADR_PREL_PG_HI21 275 |
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#define R_AARCH64_ADR_PREL_PG_HI21_NC 276 |
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#define R_AARCH64_ADD_ABS_LO12_NC 277 |
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#define R_AARCH64_LDST8_ABS_LO12_NC 278 |
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#define R_AARCH64_TSTBR14 279 |
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#define R_AARCH64_CONDBR19 280 |
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#define R_AARCH64_JUMP26 282 |
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#define R_AARCH64_CALL26 283 |
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#define R_AARCH64_LDST16_ABS_LO12_NC 284 |
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#define R_AARCH64_LDST32_ABS_LO12_NC 285 |
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#define R_AARCH64_LDST64_ABS_LO12_NC 286 |
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#define R_AARCH64_LDST128_ABS_LO12_NC 299 |
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#define R_AARCH64_MOVW_PREL_G0 287 |
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#define R_AARCH64_MOVW_PREL_G0_NC 288 |
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#define R_AARCH64_MOVW_PREL_G1 289 |
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#define R_AARCH64_MOVW_PREL_G1_NC 290 |
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#define R_AARCH64_MOVW_PREL_G2 291 |
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#define R_AARCH64_MOVW_PREL_G2_NC 292 |
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#define R_AARCH64_MOVW_PREL_G3 293 |
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#define R_AARCH64_RELATIVE 1027 |
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/* |
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* These are used to set parameters in the core dumps. |
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*/ |
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#define ELF_CLASS ELFCLASS64 |
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#ifdef __AARCH64EB__ |
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#define ELF_DATA ELFDATA2MSB |
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#else |
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#define ELF_DATA ELFDATA2LSB |
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#endif |
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#define ELF_ARCH EM_AARCH64 |
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/* |
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* This yields a string that ld.so will use to load implementation |
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* specific libraries for optimization. This is more specific in |
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* intent than poking at uname or /proc/cpuinfo. |
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*/ |
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#define ELF_PLATFORM_SIZE 16 |
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#ifdef __AARCH64EB__ |
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#define ELF_PLATFORM ("aarch64_be") |
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#else |
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#define ELF_PLATFORM ("aarch64") |
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#endif |
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/* |
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* This is used to ensure we don't load something for the wrong architecture. |
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*/ |
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#define elf_check_arch(x) ((x)->e_machine == EM_AARCH64) |
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/* |
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* An executable for which elf_read_implies_exec() returns TRUE will |
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* have the READ_IMPLIES_EXEC personality flag set automatically. |
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* |
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* The decision process for determining the results are: |
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* |
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* CPU*: | arm32 | arm64 | |
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* ELF: | | | |
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* ---------------------|------------|------------| |
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* missing PT_GNU_STACK | exec-all | exec-none | |
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* PT_GNU_STACK == RWX | exec-stack | exec-stack | |
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* PT_GNU_STACK == RW | exec-none | exec-none | |
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* |
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* exec-all : all PROT_READ user mappings are executable, except when |
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* backed by files on a noexec-filesystem. |
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* exec-none : only PROT_EXEC user mappings are executable. |
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* exec-stack: only the stack and PROT_EXEC user mappings are executable. |
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* |
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* *all arm64 CPUs support NX, so there is no "lacks NX" column. |
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* |
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*/ |
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#define compat_elf_read_implies_exec(ex, stk) (stk == EXSTACK_DEFAULT) |
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#define CORE_DUMP_USE_REGSET |
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#define ELF_EXEC_PAGESIZE PAGE_SIZE |
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/* |
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* This is the base location for PIE (ET_DYN with INTERP) loads. On |
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* 64-bit, this is above 4GB to leave the entire 32-bit address |
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* space open for things that want to use the area for 32-bit pointers. |
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*/ |
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#ifdef CONFIG_ARM64_FORCE_52BIT |
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#define ELF_ET_DYN_BASE (2 * TASK_SIZE_64 / 3) |
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#else |
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#define ELF_ET_DYN_BASE (2 * DEFAULT_MAP_WINDOW_64 / 3) |
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#endif /* CONFIG_ARM64_FORCE_52BIT */ |
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#ifndef __ASSEMBLY__ |
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#include <uapi/linux/elf.h> |
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#include <linux/bug.h> |
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#include <linux/errno.h> |
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#include <linux/fs.h> |
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#include <linux/types.h> |
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#include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */ |
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typedef unsigned long elf_greg_t; |
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#define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t)) |
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#define ELF_CORE_COPY_REGS(dest, regs) \ |
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*(struct user_pt_regs *)&(dest) = (regs)->user_regs; |
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typedef elf_greg_t elf_gregset_t[ELF_NGREG]; |
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typedef struct user_fpsimd_state elf_fpregset_t; |
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/* |
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* When the program starts, a1 contains a pointer to a function to be |
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* registered with atexit, as per the SVR4 ABI. A value of 0 means we have no |
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* such handler. |
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*/ |
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#define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0 |
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#define SET_PERSONALITY(ex) \ |
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({ \ |
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clear_thread_flag(TIF_32BIT); \ |
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current->personality &= ~READ_IMPLIES_EXEC; \ |
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}) |
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/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ |
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#define ARCH_DLINFO \ |
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do { \ |
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NEW_AUX_ENT(AT_SYSINFO_EHDR, \ |
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(elf_addr_t)current->mm->context.vdso); \ |
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\ |
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/* \ |
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* Should always be nonzero unless there's a kernel bug. \ |
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* If we haven't determined a sensible value to give to \ |
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* userspace, omit the entry: \ |
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*/ \ |
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if (likely(signal_minsigstksz)) \ |
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NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \ |
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else \ |
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NEW_AUX_ENT(AT_IGNORE, 0); \ |
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} while (0) |
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#define ARCH_HAS_SETUP_ADDITIONAL_PAGES |
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struct linux_binprm; |
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extern int arch_setup_additional_pages(struct linux_binprm *bprm, |
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int uses_interp); |
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/* 1GB of VA */ |
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#ifdef CONFIG_COMPAT |
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#define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \ |
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0x7ff >> (PAGE_SHIFT - 12) : \ |
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0x3ffff >> (PAGE_SHIFT - 12)) |
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#else |
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#define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12)) |
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#endif |
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#ifdef __AARCH64EB__ |
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#define COMPAT_ELF_PLATFORM ("v8b") |
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#else |
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#define COMPAT_ELF_PLATFORM ("v8l") |
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#endif |
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#ifdef CONFIG_COMPAT |
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/* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */ |
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#define COMPAT_ELF_ET_DYN_BASE 0x000400000UL |
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/* AArch32 registers. */ |
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#define COMPAT_ELF_NGREG 18 |
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typedef unsigned int compat_elf_greg_t; |
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typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG]; |
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/* AArch32 EABI. */ |
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#define EF_ARM_EABI_MASK 0xff000000 |
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#define compat_elf_check_arch(x) (system_supports_32bit_el0() && \ |
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((x)->e_machine == EM_ARM) && \ |
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((x)->e_flags & EF_ARM_EABI_MASK)) |
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#define compat_start_thread compat_start_thread |
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/* |
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* Unlike the native SET_PERSONALITY macro, the compat version maintains |
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* READ_IMPLIES_EXEC across an execve() since this is the behaviour on |
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* arch/arm/. |
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*/ |
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#define COMPAT_SET_PERSONALITY(ex) \ |
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({ \ |
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set_thread_flag(TIF_32BIT); \ |
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}) |
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#ifdef CONFIG_COMPAT_VDSO |
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#define COMPAT_ARCH_DLINFO \ |
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do { \ |
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/* \ |
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* Note that we use Elf64_Off instead of elf_addr_t because \ |
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* elf_addr_t in compat is defined as Elf32_Addr and casting \ |
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* current->mm->context.vdso to it triggers a cast warning of \ |
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* cast from pointer to integer of different size. \ |
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*/ \ |
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NEW_AUX_ENT(AT_SYSINFO_EHDR, \ |
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(Elf64_Off)current->mm->context.vdso); \ |
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} while (0) |
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#else |
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#define COMPAT_ARCH_DLINFO |
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#endif |
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extern int aarch32_setup_additional_pages(struct linux_binprm *bprm, |
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int uses_interp); |
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#define compat_arch_setup_additional_pages \ |
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aarch32_setup_additional_pages |
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#endif /* CONFIG_COMPAT */ |
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struct arch_elf_state { |
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int flags; |
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}; |
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#define ARM64_ELF_BTI (1 << 0) |
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#define INIT_ARCH_ELF_STATE { \ |
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.flags = 0, \ |
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} |
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static inline int arch_parse_elf_property(u32 type, const void *data, |
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size_t datasz, bool compat, |
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struct arch_elf_state *arch) |
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{ |
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/* No known properties for AArch32 yet */ |
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if (IS_ENABLED(CONFIG_COMPAT) && compat) |
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return 0; |
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if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) { |
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const u32 *p = data; |
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if (datasz != sizeof(*p)) |
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return -ENOEXEC; |
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if (system_supports_bti() && |
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(*p & GNU_PROPERTY_AARCH64_FEATURE_1_BTI)) |
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arch->flags |= ARM64_ELF_BTI; |
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} |
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return 0; |
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} |
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static inline int arch_elf_pt_proc(void *ehdr, void *phdr, |
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struct file *f, bool is_interp, |
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struct arch_elf_state *state) |
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{ |
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return 0; |
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} |
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static inline int arch_check_elf(void *ehdr, bool has_interp, |
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void *interp_ehdr, |
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struct arch_elf_state *state) |
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{ |
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return 0; |
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} |
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#endif /* !__ASSEMBLY__ */ |
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#endif
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