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    Subject[PATCH V8 14/20] riscv: compat: Add elf.h implementation
    Date
    From: Guo Ren <guoren@linux.alibaba.com>

    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>
    ---
    arch/riscv/include/asm/elf.h | 41 +++++++++++++++++++++++++++++++++++-
    1 file changed, 40 insertions(+), 1 deletion(-)

    diff --git a/arch/riscv/include/asm/elf.h b/arch/riscv/include/asm/elf.h
    index f53c40026c7a..a234656cfb5d 100644
    --- a/arch/riscv/include/asm/elf.h
    +++ b/arch/riscv/include/asm/elf.h
    @@ -8,6 +8,8 @@
    #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>
    @@ -18,11 +20,13 @@
    */
    #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

    @@ -31,6 +35,8 @@
    */
    #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 ELF_EXEC_PAGESIZE (PAGE_SIZE)

    @@ -43,8 +49,14 @@
    #define ELF_ET_DYN_BASE ((TASK_SIZE / 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
    /*
    * 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,
    @@ -60,11 +72,19 @@ extern unsigned long elf_hwcap;
    */
    #define ELF_PLATFORM (NULL)

    +#define COMPAT_ELF_PLATFORM (NULL)
    +
    #ifdef CONFIG_MMU
    #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)current->mm->context.vdso); \
    + (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, \
    @@ -90,4 +110,23 @@ do { \
    *(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];
    +
    +#endif /* CONFIG_COMPAT */
    #endif /* _ASM_RISCV_ELF_H */
    --
    2.25.1
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