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riscv: compat: Add elf.h implementation

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Implement necessary type and macro for compat elf. See the code
comment for detail.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220405071314.3225832-15-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Guo Ren 2022-04-05 15:13:08 +08:00 committed by Palmer Dabbelt
parent 69d0bf4cc6
commit 87309e1082
No known key found for this signature in database
GPG key ID: 2E1319F35FBB1889
1 changed files with 40 additions and 1 deletions
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41
arch/riscv/include/asm/elf.h
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@ -8,6 +8,8 @@
#ifndef _ASM_RISCV_ELF_H #ifndef _ASM_RISCV_ELF_H
#define _ASM_RISCV_ELF_H #define _ASM_RISCV_ELF_H
#include <uapi/linux/elf.h>
#include <linux/compat.h>
#include <uapi/asm/elf.h> #include <uapi/asm/elf.h>
#include <asm/auxvec.h> #include <asm/auxvec.h>
#include <asm/byteorder.h> #include <asm/byteorder.h>
@ -18,11 +20,13 @@
*/ */
#define ELF_ARCH EM_RISCV #define ELF_ARCH EM_RISCV
#ifndef ELF_CLASS
#ifdef CONFIG_64BIT #ifdef CONFIG_64BIT
#define ELF_CLASS ELFCLASS64 #define ELF_CLASS ELFCLASS64
#else #else
#define ELF_CLASS ELFCLASS32 #define ELF_CLASS ELFCLASS32
#endif #endif
#endif
#define ELF_DATA ELFDATA2LSB #define ELF_DATA ELFDATA2LSB
@ -31,6 +35,8 @@
*/ */
#define elf_check_arch(x) ((x)->e_machine == EM_RISCV) #define elf_check_arch(x) ((x)->e_machine == EM_RISCV)
#define compat_elf_check_arch(x) ((x)->e_machine == EM_RISCV)
#define CORE_DUMP_USE_REGSET #define CORE_DUMP_USE_REGSET
#define ELF_EXEC_PAGESIZE (PAGE_SIZE) #define ELF_EXEC_PAGESIZE (PAGE_SIZE)
@ -43,8 +49,14 @@
#define ELF_ET_DYN_BASE ((TASK_SIZE / 3) * 2) #define ELF_ET_DYN_BASE ((TASK_SIZE / 3) * 2)
#ifdef CONFIG_64BIT #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)) #define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12))
#endif #endif
#endif
/* /*
* This yields a mask that user programs can use to figure out what * This yields a mask that user programs can use to figure out what
* instruction set this CPU supports. This could be done in user space, * instruction set this CPU supports. This could be done in user space,
@ -60,11 +72,19 @@ extern unsigned long elf_hwcap;
*/ */
#define ELF_PLATFORM (NULL) #define ELF_PLATFORM (NULL)
#define COMPAT_ELF_PLATFORM (NULL)
#ifdef CONFIG_MMU #ifdef CONFIG_MMU
#define ARCH_DLINFO \ #define ARCH_DLINFO \
do { \ 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, \ NEW_AUX_ENT(AT_SYSINFO_EHDR, \
(elf_addr_t)current->mm->context.vdso); \ (elf_addr_t)(ulong)current->mm->context.vdso); \
NEW_AUX_ENT(AT_L1I_CACHESIZE, \ NEW_AUX_ENT(AT_L1I_CACHESIZE, \
get_cache_size(1, CACHE_TYPE_INST)); \ get_cache_size(1, CACHE_TYPE_INST)); \
NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY, \ NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY, \
@ -90,4 +110,23 @@ do { \
*(struct user_regs_struct *)regs; \ *(struct user_regs_struct *)regs; \
} while (0); } 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];
#endif /* CONFIG_COMPAT */
#endif /* _ASM_RISCV_ELF_H */ #endif /* _ASM_RISCV_ELF_H */