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/cpufeature.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_FDPIC_CORE_EFLAGS   0
  45 #define ELF_EXEC_PAGESIZE       (PAGE_SIZE)
  46
  47 /*
  48  * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  49  * use of this is to invoke "./ld.so someprog" to test out a new version of
  50  * the loader.  We need to make sure that it is out of the way of the program
  51  * that it will "exec", and that there is sufficient room for the brk.
  52  */
  53 #define ELF_ET_DYN_BASE         ((DEFAULT_MAP_WINDOW / 3) * 2)
  54
  55 #ifdef CONFIG_64BIT
  56 #ifdef CONFIG_COMPAT
  57 #define STACK_RND_MASK          (test_thread_flag(TIF_32BIT) ? \
  58                                  0x7ff >> (PAGE_SHIFT - 12) : \
  59                                  0x3ffff >> (PAGE_SHIFT - 12))
  60 #else
  61 #define STACK_RND_MASK          (0x3ffff >> (PAGE_SHIFT - 12))
  62 #endif
  63 #endif
  64
  65 /*
  66  * Provides information on the availiable set of ISA extensions to userspace,
  67  * via a bitmap that coorespends to each single-letter ISA extension.  This is
  68  * essentially defunct, but will remain for compatibility with userspace.
  69  */
  70 #define ELF_HWCAP       riscv_get_elf_hwcap()
  71 extern unsigned long elf_hwcap;
  72
  73 #define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, dynamic_addr) \
  74         do { \
  75                 (_r)->a1 = _exec_map_addr; \
  76                 (_r)->a2 = _interp_map_addr; \
  77                 (_r)->a3 = dynamic_addr; \
  78         } while (0)
  79
  80 /*
  81  * This yields a string that ld.so will use to load implementation
  82  * specific libraries for optimization.  This is more specific in
  83  * intent than poking at uname or /proc/cpuinfo.
  84  */
  85 #define ELF_PLATFORM    (NULL)
  86
  87 #define COMPAT_ELF_PLATFORM     (NULL)
  88
  89 #define ARCH_DLINFO                                             \
  90 do {                                                            \
  91         /*                                                      \
  92          * Note that we add ulong after elf_addr_t because      \
  93          * casting current->mm->context.vdso triggers a cast    \
  94          * warning of cast from pointer to integer for          \
  95          * COMPAT ELFCLASS32.                                   \
  96          */                                                     \
  97         NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
  98                 (elf_addr_t)(ulong)current->mm->context.vdso);  \
  99         NEW_AUX_ENT(AT_L1I_CACHESIZE,                           \
 100                 get_cache_size(1, CACHE_TYPE_INST));            \
 101         NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY,                       \
 102                 get_cache_geometry(1, CACHE_TYPE_INST));        \
 103         NEW_AUX_ENT(AT_L1D_CACHESIZE,                           \
 104                 get_cache_size(1, CACHE_TYPE_DATA));            \
 105         NEW_AUX_ENT(AT_L1D_CACHEGEOMETRY,                       \
 106                 get_cache_geometry(1, CACHE_TYPE_DATA));        \
 107         NEW_AUX_ENT(AT_L2_CACHESIZE,                            \
 108                 get_cache_size(2, CACHE_TYPE_UNIFIED));         \
 109         NEW_AUX_ENT(AT_L2_CACHEGEOMETRY,                        \
 110                 get_cache_geometry(2, CACHE_TYPE_UNIFIED));     \
 111         NEW_AUX_ENT(AT_L3_CACHESIZE,                            \
 112                 get_cache_size(3, CACHE_TYPE_UNIFIED));         \
 113         NEW_AUX_ENT(AT_L3_CACHEGEOMETRY,                        \
 114                 get_cache_geometry(3, CACHE_TYPE_UNIFIED));     \
 115         /*                                                       \
 116          * Should always be nonzero unless there's a kernel bug. \
 117          * If we haven't determined a sensible value to give to  \
 118          * userspace, omit the entry:                            \
 119          */                                                      \
 120         if (likely(signal_minsigstksz))                          \
 121                 NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \
 122         else                                                     \
 123                 NEW_AUX_ENT(AT_IGNORE, 0);                       \
 124 } while (0)
 125
 126 #ifdef CONFIG_MMU
 127 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 128 struct linux_binprm;
 129 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 130         int uses_interp);
 131 #endif /* CONFIG_MMU */
 132
 133 #define ELF_CORE_COPY_REGS(dest, regs)                  \
 134 do {                                                    \
 135         *(struct user_regs_struct *)&(dest) =           \
 136                 *(struct user_regs_struct *)regs;       \
 137 } while (0);
 138
 139 #ifdef CONFIG_COMPAT
 140
 141 #define SET_PERSONALITY(ex)                                     \
 142 do {    if ((ex).e_ident[EI_CLASS] == ELFCLASS32)               \
 143                 set_thread_flag(TIF_32BIT);                     \
 144         else                                                    \
 145                 clear_thread_flag(TIF_32BIT);                   \
 146         if (personality(current->personality) != PER_LINUX32)   \
 147                 set_personality(PER_LINUX |                     \
 148                         (current->personality & (~PER_MASK)));  \
 149 } while (0)
 150
 151 #define COMPAT_ELF_ET_DYN_BASE          ((TASK_SIZE_32 / 3) * 2)
 152
 153 /* rv32 registers */
 154 typedef compat_ulong_t                  compat_elf_greg_t;
 155 typedef compat_elf_greg_t               compat_elf_gregset_t[ELF_NGREG];
 156
 157 extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
 158                                               int uses_interp);
 159 #define compat_arch_setup_additional_pages \
 160                                 compat_arch_setup_additional_pages
 161
 162 #endif /* CONFIG_COMPAT */
 163 #endif /* _ASM_RISCV_ELF_H */