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 <linux/elf-em.h>
  26#include <asm/byteorder.h>
  27#include <asm/page.h>
  28
  29typedef unsigned long elf_greg_t;
  30
  31#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
  32typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  33
  34/* Provide a nominal data structure. */
  35#define ELF_NFPREG      0
  36typedef double elf_fpreg_t;
  37typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
  38
  39#ifdef __tilegx__
  40#define ELF_CLASS       ELFCLASS64
  41#else
  42#define ELF_CLASS       ELFCLASS32
  43#endif
  44#ifdef __BIG_ENDIAN__
  45#define ELF_DATA        ELFDATA2MSB
  46#else
  47#define ELF_DATA        ELFDATA2LSB
  48#endif
  49
  50/*
  51 * There seems to be a bug in how compat_binfmt_elf.c works: it
  52 * #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info().
  53 * Hack around this by providing an enum value of ELF_ARCH.
  54 */
  55enum { ELF_ARCH = CHIP_ELF_TYPE() };
  56#define ELF_ARCH ELF_ARCH
  57
  58/*
  59 * This is used to ensure we don't load something for the wrong architecture.
  60 */
  61#define elf_check_arch(x)  \
  62        ((x)->e_ident[EI_CLASS] == ELF_CLASS && \
  63         (x)->e_ident[EI_DATA] == ELF_DATA && \
  64         (x)->e_machine == CHIP_ELF_TYPE())
  65
  66/* The module loader only handles a few relocation types. */
  67#ifndef __tilegx__
  68#define R_TILE_32                 1
  69#define R_TILE_JOFFLONG_X1       15
  70#define R_TILE_IMM16_X0_LO       25
  71#define R_TILE_IMM16_X1_LO       26
  72#define R_TILE_IMM16_X0_HA       29
  73#define R_TILE_IMM16_X1_HA       30
  74#else
  75#define R_TILEGX_64                       1
  76#define R_TILEGX_JUMPOFF_X1              21
  77#define R_TILEGX_IMM16_X0_HW0            36
  78#define R_TILEGX_IMM16_X1_HW0            37
  79#define R_TILEGX_IMM16_X0_HW1            38
  80#define R_TILEGX_IMM16_X1_HW1            39
  81#define R_TILEGX_IMM16_X0_HW2_LAST       48
  82#define R_TILEGX_IMM16_X1_HW2_LAST       49
  83#endif
  84
  85/* Use standard page size for core dumps. */
  86#define ELF_EXEC_PAGESIZE       PAGE_SIZE
  87
  88/*
  89 * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  90 * use of this is to invoke "./ld.so someprog" to test out a new version of
  91 * the loader.  We need to make sure that it is out of the way of the program
  92 * that it will "exec", and that there is sufficient room for the brk.
  93 */
  94#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
  95
  96#define ELF_CORE_COPY_REGS(_dest, _regs)                        \
  97        memcpy((char *) &_dest, (char *) _regs,                 \
  98               sizeof(struct pt_regs));
  99
 100/* No additional FP registers to copy. */
 101#define ELF_CORE_COPY_FPREGS(t, fpu) 0
 102
 103/*
 104 * This yields a mask that user programs can use to figure out what
 105 * instruction set this CPU supports.  This could be done in user space,
 106 * but it's not easy, and we've already done it here.
 107 */
 108#define ELF_HWCAP       (0)
 109
 110/*
 111 * This yields a string that ld.so will use to load implementation
 112 * specific libraries for optimization.  This is more specific in
 113 * intent than poking at uname or /proc/cpuinfo.
 114 */
 115#define ELF_PLATFORM  (NULL)
 116
 117extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr);
 118
 119#define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr)
 120
 121extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
 122#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
 123
 124/* Tilera Linux has no personalities currently, so no need to do anything. */
 125#define SET_PERSONALITY(ex) do { } while (0)
 126
 127#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 128/* Support auto-mapping of the user interrupt vectors. */
 129struct linux_binprm;
 130extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 131                                       int executable_stack);
 132/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 133#define ARCH_DLINFO \
 134do { \
 135        NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE); \
 136} while (0)
 137
 138struct mm_struct;
 139extern unsigned long arch_randomize_brk(struct mm_struct *mm);
 140#define arch_randomize_brk arch_randomize_brk
 141
 142#ifdef CONFIG_COMPAT
 143
 144#define COMPAT_ELF_PLATFORM "tilegx-m32"
 145
 146/*
 147 * "Compat" binaries have the same machine type, but 32-bit class,
 148 * since they're not a separate machine type, but just a 32-bit
 149 * variant of the standard 64-bit architecture.
 150 */
 151#define compat_elf_check_arch(x)  \
 152        ((x)->e_ident[EI_CLASS] == ELFCLASS32 && \
 153         (x)->e_machine == CHIP_ELF_TYPE())
 154
 155#define compat_start_thread(regs, ip, usp) do { \
 156                regs->pc = ptr_to_compat_reg((void *)(ip)); \
 157                regs->sp = ptr_to_compat_reg((void *)(usp)); \
 158                single_step_execve();   \
 159        } while (0)
 160
 161/*
 162 * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
 163 */
 164#undef SET_PERSONALITY
 165#define SET_PERSONALITY(ex) \
 166do { \
 167        set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
 168        current_thread_info()->status &= ~TS_COMPAT; \
 169} while (0)
 170#define COMPAT_SET_PERSONALITY(ex) \
 171do { \
 172        set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
 173        current_thread_info()->status |= TS_COMPAT; \
 174} while (0)
 175
 176#define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)
 177
 178#endif /* CONFIG_COMPAT */
 179
 180#define CORE_DUMP_USE_REGSET
 181
 182#endif /* _ASM_TILE_ELF_H */
 183