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 #define ELF_DATA        ELFDATA2LSB
  48
  49 /*
  50  * There seems to be a bug in how compat_binfmt_elf.c works: it
  51  * #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info().
  52  * Hack around this by providing an enum value of ELF_ARCH.
  53  */
  54 enum { ELF_ARCH = CHIP_ELF_TYPE() };
  55 #define ELF_ARCH ELF_ARCH
  56
  57 /*
  58  * This is used to ensure we don't load something for the wrong architecture.
  59  */
  60 #define elf_check_arch(x)  \
  61         ((x)->e_ident[EI_CLASS] == ELF_CLASS && \
  62          (x)->e_machine == CHIP_ELF_TYPE())
  63
  64 /* The module loader only handles a few relocation types. */
  65 #ifndef __tilegx__
  66 #define R_TILE_32                 1
  67 #define R_TILE_JOFFLONG_X1       15
  68 #define R_TILE_IMM16_X0_LO       25
  69 #define R_TILE_IMM16_X1_LO       26
  70 #define R_TILE_IMM16_X0_HA       29
  71 #define R_TILE_IMM16_X1_HA       30
  72 #else
  73 #define R_TILEGX_64                       1
  74 #define R_TILEGX_JUMPOFF_X1              21
  75 #define R_TILEGX_IMM16_X0_HW0            36
  76 #define R_TILEGX_IMM16_X1_HW0            37
  77 #define R_TILEGX_IMM16_X0_HW1            38
  78 #define R_TILEGX_IMM16_X1_HW1            39
  79 #define R_TILEGX_IMM16_X0_HW2_LAST       48
  80 #define R_TILEGX_IMM16_X1_HW2_LAST       49
  81 #endif
  82
  83 /* Use standard page size for core dumps. */
  84 #define ELF_EXEC_PAGESIZE       PAGE_SIZE
  85
  86 /*
  87  * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  88  * use of this is to invoke "./ld.so someprog" to test out a new version of
  89  * the loader.  We need to make sure that it is out of the way of the program
  90  * that it will "exec", and that there is sufficient room for the brk.
  91  */
  92 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
  93
  94 #define ELF_CORE_COPY_REGS(_dest, _regs)                        \
  95         memcpy((char *) &_dest, (char *) _regs,                 \
  96                sizeof(struct pt_regs));
  97
  98 /* No additional FP registers to copy. */
  99 #define ELF_CORE_COPY_FPREGS(t, fpu) 0
 100
 101 /*
 102  * This yields a mask that user programs can use to figure out what
 103  * instruction set this CPU supports.  This could be done in user space,
 104  * but it's not easy, and we've already done it here.
 105  */
 106 #define ELF_HWCAP       (0)
 107
 108 /*
 109  * This yields a string that ld.so will use to load implementation
 110  * specific libraries for optimization.  This is more specific in
 111  * intent than poking at uname or /proc/cpuinfo.
 112  */
 113 #define ELF_PLATFORM  (NULL)
 114
 115 extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr);
 116
 117 #define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr)
 118
 119 extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
 120 #define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
 121
 122 /* Tilera Linux has no personalities currently, so no need to do anything. */
 123 #define SET_PERSONALITY(ex) do { } while (0)
 124
 125 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 126 /* Support auto-mapping of the user interrupt vectors. */
 127 struct linux_binprm;
 128 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 129                                        int executable_stack);
 130 #ifdef CONFIG_COMPAT
 131
 132 #define COMPAT_ELF_PLATFORM "tilegx-m32"
 133
 134 /*
 135  * "Compat" binaries have the same machine type, but 32-bit class,
 136  * since they're not a separate machine type, but just a 32-bit
 137  * variant of the standard 64-bit architecture.
 138  */
 139 #define compat_elf_check_arch(x)  \
 140         ((x)->e_ident[EI_CLASS] == ELFCLASS32 && \
 141          (x)->e_machine == CHIP_ELF_TYPE())
 142
 143 #define compat_start_thread(regs, ip, usp) do { \
 144                 regs->pc = ptr_to_compat_reg((void *)(ip)); \
 145                 regs->sp = ptr_to_compat_reg((void *)(usp)); \
 146         } while (0)
 147
 148 /*
 149  * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
 150  */
 151 #undef SET_PERSONALITY
 152 #define SET_PERSONALITY(ex) \
 153 do { \
 154         current->personality = PER_LINUX; \
 155         current_thread_info()->status &= ~TS_COMPAT; \
 156 } while (0)
 157 #define COMPAT_SET_PERSONALITY(ex) \
 158 do { \
 159         current->personality = PER_LINUX_32BIT; \
 160         current_thread_info()->status |= TS_COMPAT; \
 161 } while (0)
 162
 163 #define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)
 164
 165 #endif /* CONFIG_COMPAT */
 166
 167 #endif /* _ASM_TILE_ELF_H */