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
  28 typedef unsigned long elf_greg_t;
  29
  30 #define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
  31 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  32
  33 #define EM_TILE64  187
  34 #define EM_TILEPRO 188
  35 #define EM_TILEGX  191
  36
  37 /* Provide a nominal data structure. */
  38 #define ELF_NFPREG      0
  39 typedef double elf_fpreg_t;
  40 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
  41
  42 #ifdef __tilegx__
  43 #define ELF_CLASS       ELFCLASS64
  44 #else
  45 #define ELF_CLASS       ELFCLASS32
  46 #endif
  47 #ifdef __BIG_ENDIAN__
  48 #define ELF_DATA        ELFDATA2MSB
  49 #else
  50 #define ELF_DATA        ELFDATA2LSB
  51 #endif
  52
  53 /*
  54  * There seems to be a bug in how compat_binfmt_elf.c works: it
  55  * #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info().
  56  * Hack around this by providing an enum value of ELF_ARCH.
  57  */
  58 enum { ELF_ARCH = CHIP_ELF_TYPE() };
  59 #define ELF_ARCH ELF_ARCH
  60
  61 /*
  62  * This is used to ensure we don't load something for the wrong architecture.
  63  */
  64 #define elf_check_arch(x)  \
  65         ((x)->e_ident[EI_CLASS] == ELF_CLASS && \
  66          (x)->e_ident[EI_DATA] == ELF_DATA && \
  67          (x)->e_machine == CHIP_ELF_TYPE())
  68
  69 /* The module loader only handles a few relocation types. */
  70 #ifndef __tilegx__
  71 #define R_TILE_32                 1
  72 #define R_TILE_JOFFLONG_X1       15
  73 #define R_TILE_IMM16_X0_LO       25
  74 #define R_TILE_IMM16_X1_LO       26
  75 #define R_TILE_IMM16_X0_HA       29
  76 #define R_TILE_IMM16_X1_HA       30
  77 #else
  78 #define R_TILEGX_64                       1
  79 #define R_TILEGX_JUMPOFF_X1              21
  80 #define R_TILEGX_IMM16_X0_HW0            36
  81 #define R_TILEGX_IMM16_X1_HW0            37
  82 #define R_TILEGX_IMM16_X0_HW1            38
  83 #define R_TILEGX_IMM16_X1_HW1            39
  84 #define R_TILEGX_IMM16_X0_HW2_LAST       48
  85 #define R_TILEGX_IMM16_X1_HW2_LAST       49
  86 #endif
  87
  88 /* Use standard page size for core dumps. */
  89 #define ELF_EXEC_PAGESIZE       PAGE_SIZE
  90
  91 /*
  92  * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  93  * use of this is to invoke "./ld.so someprog" to test out a new version of
  94  * the loader.  We need to make sure that it is out of the way of the program
  95  * that it will "exec", and that there is sufficient room for the brk.
  96  */
  97 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
  98
  99 #define ELF_CORE_COPY_REGS(_dest, _regs)                        \
 100         memcpy((char *) &_dest, (char *) _regs,                 \
 101                sizeof(struct pt_regs));
 102
 103 /* No additional FP registers to copy. */
 104 #define ELF_CORE_COPY_FPREGS(t, fpu) 0
 105
 106 /*
 107  * This yields a mask that user programs can use to figure out what
 108  * instruction set this CPU supports.  This could be done in user space,
 109  * but it's not easy, and we've already done it here.
 110  */
 111 #define ELF_HWCAP       (0)
 112
 113 /*
 114  * This yields a string that ld.so will use to load implementation
 115  * specific libraries for optimization.  This is more specific in
 116  * intent than poking at uname or /proc/cpuinfo.
 117  */
 118 #define ELF_PLATFORM  (NULL)
 119
 120 extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr);
 121
 122 #define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr)
 123
 124 extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
 125 #define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
 126
 127 /* Tilera Linux has no personalities currently, so no need to do anything. */
 128 #define SET_PERSONALITY(ex) do { } while (0)
 129
 130 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 131 /* Support auto-mapping of the user interrupt vectors. */
 132 struct linux_binprm;
 133 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 134                                        int executable_stack);
 135 #ifdef CONFIG_COMPAT
 136
 137 #define COMPAT_ELF_PLATFORM "tilegx-m32"
 138
 139 /*
 140  * "Compat" binaries have the same machine type, but 32-bit class,
 141  * since they're not a separate machine type, but just a 32-bit
 142  * variant of the standard 64-bit architecture.
 143  */
 144 #define compat_elf_check_arch(x)  \
 145         ((x)->e_ident[EI_CLASS] == ELFCLASS32 && \
 146          (x)->e_machine == CHIP_ELF_TYPE())
 147
 148 #define compat_start_thread(regs, ip, usp) do { \
 149                 regs->pc = ptr_to_compat_reg((void *)(ip)); \
 150                 regs->sp = ptr_to_compat_reg((void *)(usp)); \
 151                 single_step_execve();   \
 152         } while (0)
 153
 154 /*
 155  * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
 156  */
 157 #undef SET_PERSONALITY
 158 #define SET_PERSONALITY(ex) \
 159 do { \
 160         set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
 161         current_thread_info()->status &= ~TS_COMPAT; \
 162 } while (0)
 163 #define COMPAT_SET_PERSONALITY(ex) \
 164 do { \
 165         set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
 166         current_thread_info()->status |= TS_COMPAT; \
 167 } while (0)
 168
 169 #define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)
 170
 171 #endif /* CONFIG_COMPAT */
 172
 173 #define CORE_DUMP_USE_REGSET
 174
 175 #endif /* _ASM_TILE_ELF_H */