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