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
  29 typedef unsigned long elf_greg_t;
  30
  31 #define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
  32 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  33
  34 /* Provide a nominal data structure. */
  35 #define ELF_NFPREG      0
  36 typedef double elf_fpreg_t;
  37 typedef 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  */
  55 enum { 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
 117 extern 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
 121 extern 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. */
 129 struct linux_binprm;
 130 extern 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 \
 134 do { \
 135         NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE); \
 136 } while (0)
 137
 138 struct mm_struct;
 139 extern 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) \
 166 do { \
 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) \
 171 do { \
 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 */