LXR linux/arch/tile/include/asm/elf.h

   1/*
   2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3 *
   4 *   This program is free software; you can redistribute it and/or
   5 *   modify it under the terms of the GNU General Public License
   6 *   as published by the Free Software Foundation, version 2.
   7 *
   8 *   This program is distributed in the hope that it will be useful, but
   9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11 *   NON INFRINGEMENT.  See the GNU General Public License for
  12 *   more details.
  13 */
  14
  15#ifndef _ASM_TILE_ELF_H
  16#define _ASM_TILE_ELF_H
  17
  18/*
  19 * ELF register definitions.
  20 */
  21
  22#include <arch/chip.h>
  23
  24#include <linux/ptrace.h>
  25#include <asm/byteorder.h>
  26#include <asm/page.h>
  27
  28typedef unsigned long elf_greg_t;
  29
  30#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
  31typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  32
  33#define EM_TILEPRO 188
  34#define EM_TILEGX  191
  35
  36/* Provide a nominal data structure. */
  37#define ELF_NFPREG      0
  38typedef double elf_fpreg_t;
  39typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
  40
  41#ifdef __tilegx__
  42#define ELF_CLASS       ELFCLASS64
  43#else
  44#define ELF_CLASS       ELFCLASS32
  45#endif
  46#ifdef __BIG_ENDIAN__
  47#define ELF_DATA        ELFDATA2MSB
  48#else
  49#define ELF_DATA        ELFDATA2LSB
  50#endif
  51
  52/*
  53 * There seems to be a bug in how compat_binfmt_elf.c works: it
  54 * #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info().
  55 * Hack around this by providing an enum value of ELF_ARCH.
  56 */
  57enum { ELF_ARCH = CHIP_ELF_TYPE() };
  58#define ELF_ARCH ELF_ARCH
  59
  60/*
  61 * This is used to ensure we don't load something for the wrong architecture.
  62 */
  63#define elf_check_arch(x)  \
  64        ((x)->e_ident[EI_CLASS] == ELF_CLASS && \
  65         (x)->e_ident[EI_DATA] == ELF_DATA && \
  66         (x)->e_machine == CHIP_ELF_TYPE())
  67
  68/* The module loader only handles a few relocation types. */
  69#ifndef __tilegx__
  70#define R_TILE_32                 1
  71#define R_TILE_JOFFLONG_X1       15
  72#define R_TILE_IMM16_X0_LO       25
  73#define R_TILE_IMM16_X1_LO       26
  74#define R_TILE_IMM16_X0_HA       29
  75#define R_TILE_IMM16_X1_HA       30
  76#else
  77#define R_TILEGX_64                       1
  78#define R_TILEGX_JUMPOFF_X1              21
  79#define R_TILEGX_IMM16_X0_HW0            36
  80#define R_TILEGX_IMM16_X1_HW0            37
  81#define R_TILEGX_IMM16_X0_HW1            38
  82#define R_TILEGX_IMM16_X1_HW1            39
  83#define R_TILEGX_IMM16_X0_HW2_LAST       48
  84#define R_TILEGX_IMM16_X1_HW2_LAST       49
  85#endif
  86
  87/* Use standard page size for core dumps. */
  88#define ELF_EXEC_PAGESIZE       PAGE_SIZE
  89
  90/*
  91 * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  92 * use of this is to invoke "./ld.so someprog" to test out a new version of
  93 * the loader.  We need to make sure that it is out of the way of the program
  94 * that it will "exec", and that there is sufficient room for the brk.
  95 */
  96#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
  97
  98#define ELF_CORE_COPY_REGS(_dest, _regs)                        \
  99        memcpy((char *) &_dest, (char *) _regs,                 \
 100               sizeof(struct pt_regs));
 101
 102/* No additional FP registers to copy. */
 103#define ELF_CORE_COPY_FPREGS(t, fpu) 0
 104
 105/*
 106 * This yields a mask that user programs can use to figure out what
 107 * instruction set this CPU supports.  This could be done in user space,
 108 * but it's not easy, and we've already done it here.
 109 */
 110#define ELF_HWCAP       (0)
 111
 112/*
 113 * This yields a string that ld.so will use to load implementation
 114 * specific libraries for optimization.  This is more specific in
 115 * intent than poking at uname or /proc/cpuinfo.
 116 */
 117#define ELF_PLATFORM  (NULL)
 118
 119extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr);
 120
 121#define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr)
 122
 123extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
 124#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
 125
 126/* Tilera Linux has no personalities currently, so no need to do anything. */
 127#define SET_PERSONALITY(ex) do { } while (0)
 128
 129#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 130/* Support auto-mapping of the user interrupt vectors. */
 131struct linux_binprm;
 132extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 133                                       int executable_stack);
 134#define ARCH_DLINFO \
 135do { \
 136        NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE); \
 137} while (0)
 138
 139struct mm_struct;
 140extern unsigned long arch_randomize_brk(struct mm_struct *mm);
 141#define arch_randomize_brk arch_randomize_brk
 142
 143#ifdef CONFIG_COMPAT
 144
 145#define COMPAT_ELF_PLATFORM "tilegx-m32"
 146
 147/*
 148 * "Compat" binaries have the same machine type, but 32-bit class,
 149 * since they're not a separate machine type, but just a 32-bit
 150 * variant of the standard 64-bit architecture.
 151 */
 152#define compat_elf_check_arch(x)  \
 153        ((x)->e_ident[EI_CLASS] == ELFCLASS32 && \
 154         (x)->e_machine == CHIP_ELF_TYPE())
 155
 156#define compat_start_thread(regs, ip, usp) do { \
 157                regs->pc = ptr_to_compat_reg((void *)(ip)); \
 158                regs->sp = ptr_to_compat_reg((void *)(usp)); \
 159                single_step_execve();   \
 160        } while (0)
 161
 162/*
 163 * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
 164 */
 165#undef SET_PERSONALITY
 166#define SET_PERSONALITY(ex) \
 167do { \
 168        set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
 169        current_thread_info()->status &= ~TS_COMPAT; \
 170} while (0)
 171#define COMPAT_SET_PERSONALITY(ex) \
 172do { \
 173        set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
 174        current_thread_info()->status |= TS_COMPAT; \
 175} while (0)
 176
 177#define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)
 178
 179#endif /* CONFIG_COMPAT */
 180
 181#define CORE_DUMP_USE_REGSET
 182
 183#endif /* _ASM_TILE_ELF_H */
 184