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

   1/*
   2 * include/asm-xtensa/elf.h
   3 *
   4 * ELF register definitions
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 *
  10 * Copyright (C) 2001 - 2005 Tensilica Inc.
  11 */
  12
  13#ifndef _XTENSA_ELF_H
  14#define _XTENSA_ELF_H
  15
  16#include <asm/ptrace.h>
  17#include <asm/coprocessor.h>
  18
  19/* Xtensa processor ELF architecture-magic number */
  20
  21#define EM_XTENSA       94
  22#define EM_XTENSA_OLD   0xABC7
  23
  24/* Xtensa relocations defined by the ABIs */
  25
  26#define R_XTENSA_NONE           0
  27#define R_XTENSA_32             1
  28#define R_XTENSA_RTLD           2
  29#define R_XTENSA_GLOB_DAT       3
  30#define R_XTENSA_JMP_SLOT       4
  31#define R_XTENSA_RELATIVE       5
  32#define R_XTENSA_PLT            6
  33#define R_XTENSA_OP0            8
  34#define R_XTENSA_OP1            9
  35#define R_XTENSA_OP2            10
  36#define R_XTENSA_ASM_EXPAND     11
  37#define R_XTENSA_ASM_SIMPLIFY   12
  38#define R_XTENSA_GNU_VTINHERIT  15
  39#define R_XTENSA_GNU_VTENTRY    16
  40#define R_XTENSA_DIFF8          17
  41#define R_XTENSA_DIFF16         18
  42#define R_XTENSA_DIFF32         19
  43#define R_XTENSA_SLOT0_OP       20
  44#define R_XTENSA_SLOT1_OP       21
  45#define R_XTENSA_SLOT2_OP       22
  46#define R_XTENSA_SLOT3_OP       23
  47#define R_XTENSA_SLOT4_OP       24
  48#define R_XTENSA_SLOT5_OP       25
  49#define R_XTENSA_SLOT6_OP       26
  50#define R_XTENSA_SLOT7_OP       27
  51#define R_XTENSA_SLOT8_OP       28
  52#define R_XTENSA_SLOT9_OP       29
  53#define R_XTENSA_SLOT10_OP      30
  54#define R_XTENSA_SLOT11_OP      31
  55#define R_XTENSA_SLOT12_OP      32
  56#define R_XTENSA_SLOT13_OP      33
  57#define R_XTENSA_SLOT14_OP      34
  58#define R_XTENSA_SLOT0_ALT      35
  59#define R_XTENSA_SLOT1_ALT      36
  60#define R_XTENSA_SLOT2_ALT      37
  61#define R_XTENSA_SLOT3_ALT      38
  62#define R_XTENSA_SLOT4_ALT      39
  63#define R_XTENSA_SLOT5_ALT      40
  64#define R_XTENSA_SLOT6_ALT      41
  65#define R_XTENSA_SLOT7_ALT      42
  66#define R_XTENSA_SLOT8_ALT      43
  67#define R_XTENSA_SLOT9_ALT      44
  68#define R_XTENSA_SLOT10_ALT     45
  69#define R_XTENSA_SLOT11_ALT     46
  70#define R_XTENSA_SLOT12_ALT     47
  71#define R_XTENSA_SLOT13_ALT     48
  72#define R_XTENSA_SLOT14_ALT     49
  73
  74/* ELF register definitions. This is needed for core dump support.  */
  75
  76typedef unsigned long elf_greg_t;
  77
  78typedef struct {
  79        elf_greg_t pc;
  80        elf_greg_t ps;
  81        elf_greg_t lbeg;
  82        elf_greg_t lend;
  83        elf_greg_t lcount;
  84        elf_greg_t sar;
  85        elf_greg_t windowstart;
  86        elf_greg_t windowbase;
  87        elf_greg_t threadptr;
  88        elf_greg_t reserved[7+48];
  89        elf_greg_t a[64];
  90} xtensa_gregset_t;
  91
  92#define ELF_NGREG       (sizeof(xtensa_gregset_t) / sizeof(elf_greg_t))
  93
  94typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  95
  96#define ELF_NFPREG      18
  97
  98typedef unsigned int elf_fpreg_t;
  99typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 100
 101#define ELF_CORE_COPY_REGS(_eregs, _pregs)                              \
 102        xtensa_elf_core_copy_regs ((xtensa_gregset_t*)&(_eregs), _pregs);
 103
 104extern void xtensa_elf_core_copy_regs (xtensa_gregset_t *, struct pt_regs *);
 105
 106/*
 107 * This is used to ensure we don't load something for the wrong architecture.
 108 */
 109
 110#define elf_check_arch(x) ( ( (x)->e_machine == EM_XTENSA )  || \
 111                            ( (x)->e_machine == EM_XTENSA_OLD ) )
 112
 113/*
 114 * These are used to set parameters in the core dumps.
 115 */
 116
 117#ifdef __XTENSA_EL__
 118# define ELF_DATA       ELFDATA2LSB
 119#elif defined(__XTENSA_EB__)
 120# define ELF_DATA       ELFDATA2MSB
 121#else
 122# error processor byte order undefined!
 123#endif
 124
 125#define ELF_CLASS       ELFCLASS32
 126#define ELF_ARCH        EM_XTENSA
 127
 128#define ELF_EXEC_PAGESIZE       PAGE_SIZE
 129
 130/*
 131 * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 132 * use of this is to invoke "./ld.so someprog" to test out a new version of
 133 * the loader.  We need to make sure that it is out of the way of the program
 134 * that it will "exec", and that there is sufficient room for the brk.
 135 */
 136
 137#define ELF_ET_DYN_BASE         (2 * TASK_SIZE / 3)
 138
 139/*
 140 * This yields a mask that user programs can use to figure out what
 141 * instruction set this CPU supports.  This could be done in user space,
 142 * but it's not easy, and we've already done it here.
 143 */
 144
 145#define ELF_HWCAP       (0)
 146
 147/*
 148 * This yields a string that ld.so will use to load implementation
 149 * specific libraries for optimization.  This is more specific in
 150 * intent than poking at uname or /proc/cpuinfo.
 151 * For the moment, we have only optimizations for the Intel generations,
 152 * but that could change...
 153 */
 154
 155#define ELF_PLATFORM  (NULL)
 156
 157/*
 158 * The Xtensa processor ABI says that when the program starts, a2
 159 * contains a pointer to a function which might be registered using
 160 * `atexit'.  This provides a mean for the dynamic linker to call
 161 * DT_FINI functions for shared libraries that have been loaded before
 162 * the code runs.
 163 *
 164 * A value of 0 tells we have no such handler.
 165 *
 166 * We might as well make sure everything else is cleared too (except
 167 * for the stack pointer in a1), just to make things more
 168 * deterministic.  Also, clearing a0 terminates debugger backtraces.
 169 */
 170
 171#define ELF_PLAT_INIT(_r, load_addr) \
 172        do { _r->areg[0]=0; /*_r->areg[1]=0;*/ _r->areg[2]=0;  _r->areg[3]=0;  \
 173             _r->areg[4]=0;  _r->areg[5]=0;    _r->areg[6]=0;  _r->areg[7]=0;  \
 174             _r->areg[8]=0;  _r->areg[9]=0;    _r->areg[10]=0; _r->areg[11]=0; \
 175             _r->areg[12]=0; _r->areg[13]=0;   _r->areg[14]=0; _r->areg[15]=0; \
 176        } while (0)
 177
 178typedef struct {
 179        xtregs_opt_t    opt;
 180        xtregs_user_t   user;
 181#if XTENSA_HAVE_COPROCESSORS
 182        xtregs_cp0_t    cp0;
 183        xtregs_cp1_t    cp1;
 184        xtregs_cp2_t    cp2;
 185        xtregs_cp3_t    cp3;
 186        xtregs_cp4_t    cp4;
 187        xtregs_cp5_t    cp5;
 188        xtregs_cp6_t    cp6;
 189        xtregs_cp7_t    cp7;
 190#endif
 191} elf_xtregs_t;
 192
 193#define SET_PERSONALITY(ex) \
 194        set_personality(PER_LINUX_32BIT | (current->personality & (~PER_MASK)))
 195
 196struct task_struct;
 197
 198extern void do_copy_regs (xtensa_gregset_t*, struct pt_regs*,
 199                          struct task_struct*);
 200extern void do_restore_regs (xtensa_gregset_t*, struct pt_regs*,
 201                             struct task_struct*);
 202extern void do_save_fpregs (elf_fpregset_t*, struct pt_regs*,
 203                            struct task_struct*);
 204extern int do_restore_fpregs (elf_fpregset_t*, struct pt_regs*,
 205                              struct task_struct*);
 206
 207#endif  /* _XTENSA_ELF_H */
 208