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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2003 Matjaz Breskvar <[email protected]>
* Copyright (C) 2010-2011 Jonas Bonn <[email protected]>
* Copyright (C) 2012 Regents of the University of California
*/
#ifndef _ASM_RISCV_ELF_H
#define _ASM_RISCV_ELF_H
#include <uapi/linux/elf.h>
#include <linux/compat.h>
#include <uapi/asm/elf.h>
#include <asm/auxvec.h>
#include <asm/byteorder.h>
#include <asm/cacheinfo.h>
#include <asm/cpufeature.h>
/*
* These are used to set parameters in the core dumps.
*/
#define ELF_ARCH EM_RISCV
#ifndef ELF_CLASS
#ifdef CONFIG_64BIT
#define ELF_CLASS ELFCLASS64
#else
#define ELF_CLASS ELFCLASS32
#endif
#endif
#define ELF_DATA ELFDATA2LSB
/*
* This is used to ensure we don't load something for the wrong architecture.
*/
#define elf_check_arch(x) (((x)->e_machine == EM_RISCV) && \
((x)->e_ident[EI_CLASS] == ELF_CLASS))
extern bool compat_elf_check_arch(Elf32_Ehdr *hdr);
#define compat_elf_check_arch compat_elf_check_arch
#define CORE_DUMP_USE_REGSET
#define ELF_FDPIC_CORE_EFLAGS 0
#define ELF_EXEC_PAGESIZE (PAGE_SIZE)
/*
* 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.
*/
#define ELF_ET_DYN_BASE ((DEFAULT_MAP_WINDOW / 3) * 2)
#ifdef CONFIG_64BIT
#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
#endif
/*
* Provides information on the availiable set of ISA extensions to userspace,
* via a bitmap that coorespends to each single-letter ISA extension. This is
* essentially defunct, but will remain for compatibility with userspace.
*/
#define ELF_HWCAP riscv_get_elf_hwcap()
extern unsigned long elf_hwcap;
#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, dynamic_addr) \
do { \
(_r)->a1 = _exec_map_addr; \
(_r)->a2 = _interp_map_addr; \
(_r)->a3 = dynamic_addr; \
} while (0)
/*
* 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 (NULL)
#define COMPAT_ELF_PLATFORM (NULL)
#define ARCH_DLINFO \
do { \
/* \
* Note that we add ulong after elf_addr_t because \
* casting current->mm->context.vdso triggers a cast \
* warning of cast from pointer to integer for \
* COMPAT ELFCLASS32. \
*/ \
NEW_AUX_ENT(AT_SYSINFO_EHDR, \
(elf_addr_t)(ulong)current->mm->context.vdso); \
NEW_AUX_ENT(AT_L1I_CACHESIZE, \
get_cache_size(1, CACHE_TYPE_INST)); \
NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY, \
get_cache_geometry(1, CACHE_TYPE_INST)); \
NEW_AUX_ENT(AT_L1D_CACHESIZE, \
get_cache_size(1, CACHE_TYPE_DATA)); \
NEW_AUX_ENT(AT_L1D_CACHEGEOMETRY, \
get_cache_geometry(1, CACHE_TYPE_DATA)); \
NEW_AUX_ENT(AT_L2_CACHESIZE, \
get_cache_size(2, CACHE_TYPE_UNIFIED)); \
NEW_AUX_ENT(AT_L2_CACHEGEOMETRY, \
get_cache_geometry(2, CACHE_TYPE_UNIFIED)); \
NEW_AUX_ENT(AT_L3_CACHESIZE, \
get_cache_size(3, CACHE_TYPE_UNIFIED)); \
NEW_AUX_ENT(AT_L3_CACHEGEOMETRY, \
get_cache_geometry(3, CACHE_TYPE_UNIFIED)); \
/* \
* 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)
#ifdef CONFIG_MMU
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
struct linux_binprm;
extern int arch_setup_additional_pages(struct linux_binprm *bprm,
int uses_interp);
#endif /* CONFIG_MMU */
#define ELF_CORE_COPY_REGS(dest, regs) \
do { \
*(struct user_regs_struct *)&(dest) = \
*(struct user_regs_struct *)regs; \
} while (0);
#ifdef CONFIG_COMPAT
#define SET_PERSONALITY(ex) \
do { if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
set_thread_flag(TIF_32BIT); \
else \
clear_thread_flag(TIF_32BIT); \
if (personality(current->personality) != PER_LINUX32) \
set_personality(PER_LINUX | \
(current->personality & (~PER_MASK))); \
} while (0)
#define COMPAT_ELF_ET_DYN_BASE ((TASK_SIZE_32 / 3) * 2)
/* rv32 registers */
typedef compat_ulong_t compat_elf_greg_t;
typedef compat_elf_greg_t compat_elf_gregset_t[ELF_NGREG];
extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
int uses_interp);
#define compat_arch_setup_additional_pages \
compat_arch_setup_additional_pages
#endif /* CONFIG_COMPAT */
#endif /* _ASM_RISCV_ELF_H */
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