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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 ARM Ltd.
*/
#ifndef __ASM_ELF_H
#define __ASM_ELF_H
#include <asm/hwcap.h>
/*
* ELF register definitions..
*/
#include <asm/ptrace.h>
#include <asm/user.h>
/*
* AArch64 static relocation types.
*/
/* Miscellaneous. */
#define R_ARM_NONE 0
#define R_AARCH64_NONE 256
/* Data. */
#define R_AARCH64_ABS64 257
#define R_AARCH64_ABS32 258
#define R_AARCH64_ABS16 259
#define R_AARCH64_PREL64 260
#define R_AARCH64_PREL32 261
#define R_AARCH64_PREL16 262
/* Instructions. */
#define R_AARCH64_MOVW_UABS_G0 263
#define R_AARCH64_MOVW_UABS_G0_NC 264
#define R_AARCH64_MOVW_UABS_G1 265
#define R_AARCH64_MOVW_UABS_G1_NC 266
#define R_AARCH64_MOVW_UABS_G2 267
#define R_AARCH64_MOVW_UABS_G2_NC 268
#define R_AARCH64_MOVW_UABS_G3 269
#define R_AARCH64_MOVW_SABS_G0 270
#define R_AARCH64_MOVW_SABS_G1 271
#define R_AARCH64_MOVW_SABS_G2 272
#define R_AARCH64_LD_PREL_LO19 273
#define R_AARCH64_ADR_PREL_LO21 274
#define R_AARCH64_ADR_PREL_PG_HI21 275
#define R_AARCH64_ADR_PREL_PG_HI21_NC 276
#define R_AARCH64_ADD_ABS_LO12_NC 277
#define R_AARCH64_LDST8_ABS_LO12_NC 278
#define R_AARCH64_TSTBR14 279
#define R_AARCH64_CONDBR19 280
#define R_AARCH64_JUMP26 282
#define R_AARCH64_CALL26 283
#define R_AARCH64_LDST16_ABS_LO12_NC 284
#define R_AARCH64_LDST32_ABS_LO12_NC 285
#define R_AARCH64_LDST64_ABS_LO12_NC 286
#define R_AARCH64_LDST128_ABS_LO12_NC 299
#define R_AARCH64_MOVW_PREL_G0 287
#define R_AARCH64_MOVW_PREL_G0_NC 288
#define R_AARCH64_MOVW_PREL_G1 289
#define R_AARCH64_MOVW_PREL_G1_NC 290
#define R_AARCH64_MOVW_PREL_G2 291
#define R_AARCH64_MOVW_PREL_G2_NC 292
#define R_AARCH64_MOVW_PREL_G3 293
#define R_AARCH64_RELATIVE 1027
/*
* These are used to set parameters in the core dumps.
*/
#define ELF_CLASS ELFCLASS64
#ifdef __AARCH64EB__
#define ELF_DATA ELFDATA2MSB
#else
#define ELF_DATA ELFDATA2LSB
#endif
#define ELF_ARCH EM_AARCH64
/*
* 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_SIZE 16
#ifdef __AARCH64EB__
#define ELF_PLATFORM ("aarch64_be")
#else
#define ELF_PLATFORM ("aarch64")
#endif
/*
* This is used to ensure we don't load something for the wrong architecture.
*/
#define elf_check_arch(x) ((x)->e_machine == EM_AARCH64)
/*
* An executable for which elf_read_implies_exec() returns TRUE will
* have the READ_IMPLIES_EXEC personality flag set automatically.
*
* The decision process for determining the results are:
*
* CPU*: | arm32 | arm64 |
* ELF: | | |
* ---------------------|------------|------------|
* missing PT_GNU_STACK | exec-all | exec-none |
* PT_GNU_STACK == RWX | exec-stack | exec-stack |
* PT_GNU_STACK == RW | exec-none | exec-none |
*
* exec-all : all PROT_READ user mappings are executable, except when
* backed by files on a noexec-filesystem.
* exec-none : only PROT_EXEC user mappings are executable.
* exec-stack: only the stack and PROT_EXEC user mappings are executable.
*
* *all arm64 CPUs support NX, so there is no "lacks NX" column.
*
*/
#define compat_elf_read_implies_exec(ex, stk) (stk == EXSTACK_DEFAULT)
#define CORE_DUMP_USE_REGSET
#define ELF_EXEC_PAGESIZE PAGE_SIZE
/*
* This is the base location for PIE (ET_DYN with INTERP) loads. On
* 64-bit, this is above 4GB to leave the entire 32-bit address
* space open for things that want to use the area for 32-bit pointers.
*/
#ifdef CONFIG_ARM64_FORCE_52BIT
#define ELF_ET_DYN_BASE (2 * TASK_SIZE_64 / 3)
#else
#define ELF_ET_DYN_BASE (2 * DEFAULT_MAP_WINDOW_64 / 3)
#endif /* CONFIG_ARM64_FORCE_52BIT */
#ifndef __ASSEMBLY__
#include <uapi/linux/elf.h>
#include <linux/bug.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */
typedef unsigned long elf_greg_t;
#define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t))
#define ELF_CORE_COPY_REGS(dest, regs) \
*(struct user_pt_regs *)&(dest) = (regs)->user_regs;
typedef elf_greg_t elf_gregset_t[ELF_NGREG];
typedef struct user_fpsimd_state elf_fpregset_t;
/*
* When the program starts, a1 contains a pointer to a function to be
* registered with atexit, as per the SVR4 ABI. A value of 0 means we have no
* such handler.
*/
#define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0
#define SET_PERSONALITY(ex) \
({ \
clear_thread_flag(TIF_32BIT); \
current->personality &= ~READ_IMPLIES_EXEC; \
})
/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
#define ARCH_DLINFO \
do { \
NEW_AUX_ENT(AT_SYSINFO_EHDR, \
(elf_addr_t)current->mm->context.vdso); \
\
/* \
* Should always be nonzero unless there's a kernel bug. \
* If we haven't determined a sensible value to give to \
* userspace, omit the entry: \
*/ \
if (likely(signal_minsigstksz)) \
NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \
else \
NEW_AUX_ENT(AT_IGNORE, 0); \
} while (0)
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
struct linux_binprm;
extern int arch_setup_additional_pages(struct linux_binprm *bprm,
int uses_interp);
/* 1GB of VA */
#ifdef CONFIG_COMPAT
#define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \
0x7ff >> (PAGE_SHIFT - 12) : \
0x3ffff >> (PAGE_SHIFT - 12))
#else
#define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12))
#endif
#ifdef __AARCH64EB__
#define COMPAT_ELF_PLATFORM ("v8b")
#else
#define COMPAT_ELF_PLATFORM ("v8l")
#endif
#ifdef CONFIG_COMPAT
/* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */
#define COMPAT_ELF_ET_DYN_BASE 0x000400000UL
/* AArch32 registers. */
#define COMPAT_ELF_NGREG 18
typedef unsigned int compat_elf_greg_t;
typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];
/* AArch32 EABI. */
#define EF_ARM_EABI_MASK 0xff000000
int compat_elf_check_arch(const struct elf32_hdr *);
#define compat_elf_check_arch compat_elf_check_arch
#define compat_start_thread compat_start_thread
/*
* Unlike the native SET_PERSONALITY macro, the compat version maintains
* READ_IMPLIES_EXEC across an execve() since this is the behaviour on
* arch/arm/.
*/
#define COMPAT_SET_PERSONALITY(ex) \
({ \
set_thread_flag(TIF_32BIT); \
})
#ifdef CONFIG_COMPAT_VDSO
#define COMPAT_ARCH_DLINFO \
do { \
/* \
* Note that we use Elf64_Off instead of elf_addr_t because \
* elf_addr_t in compat is defined as Elf32_Addr and casting \
* current->mm->context.vdso to it triggers a cast warning of \
* cast from pointer to integer of different size. \
*/ \
NEW_AUX_ENT(AT_SYSINFO_EHDR, \
(Elf64_Off)current->mm->context.vdso); \
} while (0)
#else
#define COMPAT_ARCH_DLINFO
#endif
extern int aarch32_setup_additional_pages(struct linux_binprm *bprm,
int uses_interp);
#define compat_arch_setup_additional_pages \
aarch32_setup_additional_pages
#endif /* CONFIG_COMPAT */
struct arch_elf_state {
int flags;
};
#define ARM64_ELF_BTI (1 << 0)
#define INIT_ARCH_ELF_STATE { \
.flags = 0, \
}
static inline int arch_parse_elf_property(u32 type, const void *data,
size_t datasz, bool compat,
struct arch_elf_state *arch)
{
/* No known properties for AArch32 yet */
if (IS_ENABLED(CONFIG_COMPAT) && compat)
return 0;
if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) {
const u32 *p = data;
if (datasz != sizeof(*p))
return -ENOEXEC;
if (system_supports_bti() &&
(*p & GNU_PROPERTY_AARCH64_FEATURE_1_BTI))
arch->flags |= ARM64_ELF_BTI;
}
return 0;
}
static inline int arch_elf_pt_proc(void *ehdr, void *phdr,
struct file *f, bool is_interp,
struct arch_elf_state *state)
{
return 0;
}
static inline int arch_check_elf(void *ehdr, bool has_interp,
void *interp_ehdr,
struct arch_elf_state *state)
{
return 0;
}
#endif /* !__ASSEMBLY__ */
#endif