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 #include <asm/hwcap.h>
  18
  19 /*
  20  * These are used to set parameters in the core dumps.
  21  */
  22 #define ELF_ARCH        EM_RISCV
  23
  24 #ifndef ELF_CLASS
  25 #ifdef CONFIG_64BIT
  26 #define ELF_CLASS       ELFCLASS64
  27 #else
  28 #define ELF_CLASS       ELFCLASS32
  29 #endif
  30 #endif
  31
  32 #define ELF_DATA        ELFDATA2LSB
  33
  34 /*
  35  * This is used to ensure we don't load something for the wrong architecture.
  36  */
  37 #define elf_check_arch(x) (((x)->e_machine == EM_RISCV) && \
  38                            ((x)->e_ident[EI_CLASS] == ELF_CLASS))
  39
  40 extern bool compat_elf_check_arch(Elf32_Ehdr *hdr);
  41 #define compat_elf_check_arch   compat_elf_check_arch
  42
  43 #define CORE_DUMP_USE_REGSET
  44 #define ELF_EXEC_PAGESIZE       (PAGE_SIZE)
  45
  46 /*
  47  * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  48  * use of this is to invoke "./ld.so someprog" to test out a new version of
  49  * the loader.  We need to make sure that it is out of the way of the program
  50  * that it will "exec", and that there is sufficient room for the brk.
  51  */
  52 #define ELF_ET_DYN_BASE         ((TASK_SIZE / 3) * 2)
  53
  54 #ifdef CONFIG_64BIT
  55 #ifdef CONFIG_COMPAT
  56 #define STACK_RND_MASK          (test_thread_flag(TIF_32BIT) ? \
  57                                  0x7ff >> (PAGE_SHIFT - 12) : \
  58                                  0x3ffff >> (PAGE_SHIFT - 12))
  59 #else
  60 #define STACK_RND_MASK          (0x3ffff >> (PAGE_SHIFT - 12))
  61 #endif
  62 #endif
  63
  64 /*
  65  * Provides information on the availiable set of ISA extensions to userspace,
  66  * via a bitmap that coorespends to each single-letter ISA extension.  This is
  67  * essentially defunct, but will remain for compatibility with userspace.
  68  */
  69 #define ELF_HWCAP       (elf_hwcap & ((1UL << RISCV_ISA_EXT_BASE) - 1))
  70 extern unsigned long elf_hwcap;
  71
  72 /*
  73  * This yields a string that ld.so will use to load implementation
  74  * specific libraries for optimization.  This is more specific in
  75  * intent than poking at uname or /proc/cpuinfo.
  76  */
  77 #define ELF_PLATFORM    (NULL)
  78
  79 #define COMPAT_ELF_PLATFORM     (NULL)
  80
  81 #ifdef CONFIG_MMU
  82 #define ARCH_DLINFO                                             \
  83 do {                                                            \
  84         /*                                                      \
  85          * Note that we add ulong after elf_addr_t because      \
  86          * casting current->mm->context.vdso triggers a cast    \
  87          * warning of cast from pointer to integer for          \
  88          * COMPAT ELFCLASS32.                                   \
  89          */                                                     \
  90         NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
  91                 (elf_addr_t)(ulong)current->mm->context.vdso);  \
  92         NEW_AUX_ENT(AT_L1I_CACHESIZE,                           \
  93                 get_cache_size(1, CACHE_TYPE_INST));            \
  94         NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY,                       \
  95                 get_cache_geometry(1, CACHE_TYPE_INST));        \
  96         NEW_AUX_ENT(AT_L1D_CACHESIZE,                           \
  97                 get_cache_size(1, CACHE_TYPE_DATA));            \
  98         NEW_AUX_ENT(AT_L1D_CACHEGEOMETRY,                       \
  99                 get_cache_geometry(1, CACHE_TYPE_DATA));        \
 100         NEW_AUX_ENT(AT_L2_CACHESIZE,                            \
 101                 get_cache_size(2, CACHE_TYPE_UNIFIED));         \
 102         NEW_AUX_ENT(AT_L2_CACHEGEOMETRY,                        \
 103                 get_cache_geometry(2, CACHE_TYPE_UNIFIED));     \
 104         NEW_AUX_ENT(AT_L3_CACHESIZE,                            \
 105                 get_cache_size(3, CACHE_TYPE_UNIFIED));         \
 106         NEW_AUX_ENT(AT_L3_CACHEGEOMETRY,                        \
 107                 get_cache_geometry(3, CACHE_TYPE_UNIFIED));     \
 108 } while (0)
 109 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 110 struct linux_binprm;
 111 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 112         int uses_interp);
 113 #endif /* CONFIG_MMU */
 114
 115 #define ELF_CORE_COPY_REGS(dest, regs)                  \
 116 do {                                                    \
 117         *(struct user_regs_struct *)&(dest) =           \
 118                 *(struct user_regs_struct *)regs;       \
 119 } while (0);
 120
 121 #ifdef CONFIG_COMPAT
 122
 123 #define SET_PERSONALITY(ex)                                     \
 124 do {    if ((ex).e_ident[EI_CLASS] == ELFCLASS32)               \
 125                 set_thread_flag(TIF_32BIT);                     \
 126         else                                                    \
 127                 clear_thread_flag(TIF_32BIT);                   \
 128         if (personality(current->personality) != PER_LINUX32)   \
 129                 set_personality(PER_LINUX |                     \
 130                         (current->personality & (~PER_MASK)));  \
 131 } while (0)
 132
 133 #define COMPAT_ELF_ET_DYN_BASE          ((TASK_SIZE_32 / 3) * 2)
 134
 135 /* rv32 registers */
 136 typedef compat_ulong_t                  compat_elf_greg_t;
 137 typedef compat_elf_greg_t               compat_elf_gregset_t[ELF_NGREG];
 138
 139 extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
 140                                               int uses_interp);
 141 #define compat_arch_setup_additional_pages \
 142                                 compat_arch_setup_additional_pages
 143
 144 #endif /* CONFIG_COMPAT */
 145 #endif /* _ASM_RISCV_ELF_H */