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_TILEPRO 188
  34 #define EM_TILEGX  191
  35
  36 /* Provide a nominal data structure. */
  37 #define ELF_NFPREG      0
  38 typedef double elf_fpreg_t;
  39 typedef 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  */
  57 enum { 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
 119 extern 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
 123 extern 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. */
 131 struct linux_binprm;
 132 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 133                                        int executable_stack);
 134 #define ARCH_DLINFO \
 135 do { \
 136         NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE); \
 137 } while (0)
 138
 139 struct mm_struct;
 140 extern 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) \
 167 do { \
 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) \
 172 do { \
 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 */