arch/riscv/include/asm/elf.h

   1 /*
   2  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
   3  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
   4  * Copyright (C) 2012 Regents of the University of California
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #ifndef _ASM_RISCV_ELF_H
  13 #define _ASM_RISCV_ELF_H
  14
  15 #include <uapi/asm/elf.h>
  16 #include <asm/auxvec.h>
  17 #include <asm/byteorder.h>
  18
  19 /* TODO: Move definition into include/uapi/linux/elf-em.h */
  20 #define EM_RISCV        0xF3
  21
  22 /*
  23  * These are used to set parameters in the core dumps.
  24  */
  25 #define ELF_ARCH        EM_RISCV
  26
  27 #ifdef CONFIG_64BIT
  28 #define ELF_CLASS       ELFCLASS64
  29 #else
  30 #define ELF_CLASS       ELFCLASS32
  31 #endif
  32
  33 #if defined(__LITTLE_ENDIAN)
  34 #define ELF_DATA        ELFDATA2LSB
  35 #elif defined(__BIG_ENDIAN)
  36 #define ELF_DATA        ELFDATA2MSB
  37 #else
  38 #error "Unknown endianness"
  39 #endif
  40
  41 /*
  42  * This is used to ensure we don't load something for the wrong architecture.
  43  */
  44 #define elf_check_arch(x) ((x)->e_machine == EM_RISCV)
  45
  46 #define CORE_DUMP_USE_REGSET
  47 #define ELF_EXEC_PAGESIZE       (PAGE_SIZE)
  48
  49 /*
  50  * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  51  * use of this is to invoke "./ld.so someprog" to test out a new version of
  52  * the loader.  We need to make sure that it is out of the way of the program
  53  * that it will "exec", and that there is sufficient room for the brk.
  54  */
  55 #define ELF_ET_DYN_BASE         ((TASK_SIZE / 3) * 2)
  56
  57 /*
  58  * This yields a mask that user programs can use to figure out what
  59  * instruction set this CPU supports.  This could be done in user space,
  60  * but it's not easy, and we've already done it here.
  61  */
  62 #define ELF_HWCAP       (elf_hwcap)
  63 extern unsigned long elf_hwcap;
  64
  65 /*
  66  * This yields a string that ld.so will use to load implementation
  67  * specific libraries for optimization.  This is more specific in
  68  * intent than poking at uname or /proc/cpuinfo.
  69  */
  70 #define ELF_PLATFORM    (NULL)
  71
  72 #define ARCH_DLINFO                                             \
  73 do {                                                            \
  74         NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
  75                 (elf_addr_t)current->mm->context.vdso);         \
  76 } while (0)
  77
  78
  79 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
  80 struct linux_binprm;
  81 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
  82         int uses_interp);
  83
  84 #endif /* _ASM_RISCV_ELF_H */