arch/riscv/include/asm/elf.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
   4  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
   5  * Copyright (C) 2012 Regents of the University of California
   6  */
   7
   8 #ifndef _ASM_RISCV_ELF_H
   9 #define _ASM_RISCV_ELF_H
  10
  11 #include <uapi/linux/elf.h>
  12 #include <linux/compat.h>
  13 #include <uapi/asm/elf.h>
  14 #include <asm/auxvec.h>
  15 #include <asm/byteorder.h>
  16 #include <asm/cacheinfo.h>
  17
  18 /*
  19  * These are used to set parameters in the core dumps.
  20  */
  21 #define ELF_ARCH        EM_RISCV
  22
  23 #ifndef ELF_CLASS
  24 #ifdef CONFIG_64BIT
  25 #define ELF_CLASS       ELFCLASS64
  26 #else
  27 #define ELF_CLASS       ELFCLASS32
  28 #endif
  29 #endif
  30
  31 #define ELF_DATA        ELFDATA2LSB
  32
  33 /*
  34  * This is used to ensure we don't load something for the wrong architecture.
  35  */
  36 #define elf_check_arch(x) (((x)->e_machine == EM_RISCV) && \
  37                            ((x)->e_ident[EI_CLASS] == ELF_CLASS))
  38
  39 extern bool compat_elf_check_arch(Elf32_Ehdr *hdr);
  40 #define compat_elf_check_arch   compat_elf_check_arch
  41
  42 #define CORE_DUMP_USE_REGSET
  43 #define ELF_EXEC_PAGESIZE       (PAGE_SIZE)
  44
  45 /*
  46  * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  47  * use of this is to invoke "./ld.so someprog" to test out a new version of
  48  * the loader.  We need to make sure that it is out of the way of the program
  49  * that it will "exec", and that there is sufficient room for the brk.
  50  */
  51 #define ELF_ET_DYN_BASE         ((TASK_SIZE / 3) * 2)
  52
  53 #ifdef CONFIG_64BIT
  54 #ifdef CONFIG_COMPAT
  55 #define STACK_RND_MASK          (test_thread_flag(TIF_32BIT) ? \
  56                                  0x7ff >> (PAGE_SHIFT - 12) : \
  57                                  0x3ffff >> (PAGE_SHIFT - 12))
  58 #else
  59 #define STACK_RND_MASK          (0x3ffff >> (PAGE_SHIFT - 12))
  60 #endif
  61 #endif
  62 /*
  63  * This yields a mask that user programs can use to figure out what
  64  * instruction set this CPU supports.  This could be done in user space,
  65  * but it's not easy, and we've already done it here.
  66  */
  67 #define ELF_HWCAP       (elf_hwcap)
  68 extern unsigned long elf_hwcap;
  69
  70 /*
  71  * This yields a string that ld.so will use to load implementation
  72  * specific libraries for optimization.  This is more specific in
  73  * intent than poking at uname or /proc/cpuinfo.
  74  */
  75 #define ELF_PLATFORM    (NULL)
  76
  77 #define COMPAT_ELF_PLATFORM     (NULL)
  78
  79 #ifdef CONFIG_MMU
  80 #define ARCH_DLINFO                                             \
  81 do {                                                            \
  82         /*                                                      \
  83          * Note that we add ulong after elf_addr_t because      \
  84          * casting current->mm->context.vdso triggers a cast    \
  85          * warning of cast from pointer to integer for          \
  86          * COMPAT ELFCLASS32.                                   \
  87          */                                                     \
  88         NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
  89                 (elf_addr_t)(ulong)current->mm->context.vdso);  \
  90         NEW_AUX_ENT(AT_L1I_CACHESIZE,                           \
  91                 get_cache_size(1, CACHE_TYPE_INST));            \
  92         NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY,                       \
  93                 get_cache_geometry(1, CACHE_TYPE_INST));        \
  94         NEW_AUX_ENT(AT_L1D_CACHESIZE,                           \
  95                 get_cache_size(1, CACHE_TYPE_DATA));            \
  96         NEW_AUX_ENT(AT_L1D_CACHEGEOMETRY,                       \
  97                 get_cache_geometry(1, CACHE_TYPE_DATA));        \
  98         NEW_AUX_ENT(AT_L2_CACHESIZE,                            \
  99                 get_cache_size(2, CACHE_TYPE_UNIFIED));         \
 100         NEW_AUX_ENT(AT_L2_CACHEGEOMETRY,                        \
 101                 get_cache_geometry(2, CACHE_TYPE_UNIFIED));     \
 102 } while (0)
 103 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 104 struct linux_binprm;
 105 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 106         int uses_interp);
 107 #endif /* CONFIG_MMU */
 108
 109 #define ELF_CORE_COPY_REGS(dest, regs)                  \
 110 do {                                                    \
 111         *(struct user_regs_struct *)&(dest) =           \
 112                 *(struct user_regs_struct *)regs;       \
 113 } while (0);
 114
 115 #ifdef CONFIG_COMPAT
 116
 117 #define SET_PERSONALITY(ex)                                     \
 118 do {    if ((ex).e_ident[EI_CLASS] == ELFCLASS32)               \
 119                 set_thread_flag(TIF_32BIT);                     \
 120         else                                                    \
 121                 clear_thread_flag(TIF_32BIT);                   \
 122         if (personality(current->personality) != PER_LINUX32)   \
 123                 set_personality(PER_LINUX |                     \
 124                         (current->personality & (~PER_MASK)));  \
 125 } while (0)
 126
 127 #define COMPAT_ELF_ET_DYN_BASE          ((TASK_SIZE_32 / 3) * 2)
 128
 129 /* rv32 registers */
 130 typedef compat_ulong_t                  compat_elf_greg_t;
 131 typedef compat_elf_greg_t               compat_elf_gregset_t[ELF_NGREG];
 132
 133 extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
 134                                               int uses_interp);
 135 #define compat_arch_setup_additional_pages \
 136                                 compat_arch_setup_additional_pages
 137
 138 #endif /* CONFIG_COMPAT */
 139 #endif /* _ASM_RISCV_ELF_H */