include/asm-i386/elf.h

   1 #ifndef __ASMi386_ELF_H
   2 #define __ASMi386_ELF_H
   3
   4 /*
   5  * ELF register definitions..
   6  */
   7
   8 #include <asm/ptrace.h>
   9 #include <asm/user.h>
  10 #include <asm/processor.h>
  11 #include <asm/system.h>         /* for savesegment */
  12
  13 #include <linux/utsname.h>
  14
  15 #define R_386_NONE      0
  16 #define R_386_32        1
  17 #define R_386_PC32      2
  18 #define R_386_GOT32     3
  19 #define R_386_PLT32     4
  20 #define R_386_COPY      5
  21 #define R_386_GLOB_DAT  6
  22 #define R_386_JMP_SLOT  7
  23 #define R_386_RELATIVE  8
  24 #define R_386_GOTOFF    9
  25 #define R_386_GOTPC     10
  26 #define R_386_NUM       11
  27
  28 typedef unsigned long elf_greg_t;
  29
  30 #define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
  31 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  32
  33 typedef struct user_i387_struct elf_fpregset_t;
  34 typedef struct user_fxsr_struct elf_fpxregset_t;
  35
  36 /*
  37  * This is used to ensure we don't load something for the wrong architecture.
  38  */
  39 #define elf_check_arch(x) \
  40         (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
  41
  42 /*
  43  * These are used to set parameters in the core dumps.
  44  */
  45 #define ELF_CLASS       ELFCLASS32
  46 #define ELF_DATA        ELFDATA2LSB
  47 #define ELF_ARCH        EM_386
  48
  49 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
  50    contains a pointer to a function which might be registered using `atexit'.
  51    This provides a mean for the dynamic linker to call DT_FINI functions for
  52    shared libraries that have been loaded before the code runs.
  53
  54    A value of 0 tells we have no such handler.
  55
  56    We might as well make sure everything else is cleared too (except for %esp),
  57    just to make things more deterministic.
  58  */
  59 #define ELF_PLAT_INIT(_r, load_addr)    do { \
  60         _r->ebx = 0; _r->ecx = 0; _r->edx = 0; \
  61         _r->esi = 0; _r->edi = 0; _r->ebp = 0; \
  62         _r->eax = 0; \
  63 } while (0)
  64
  65 #define USE_ELF_CORE_DUMP
  66 #define ELF_EXEC_PAGESIZE       4096
  67
  68 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  69    use of this is to invoke "./ld.so someprog" to test out a new version of
  70    the loader.  We need to make sure that it is out of the way of the program
  71    that it will "exec", and that there is sufficient room for the brk.  */
  72
  73 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
  74
  75 /* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
  76    now struct_user_regs, they are different) */
  77
  78 #define ELF_CORE_COPY_REGS(pr_reg, regs)                \
  79         pr_reg[0] = regs->ebx;                          \
  80         pr_reg[1] = regs->ecx;                          \
  81         pr_reg[2] = regs->edx;                          \
  82         pr_reg[3] = regs->esi;                          \
  83         pr_reg[4] = regs->edi;                          \
  84         pr_reg[5] = regs->ebp;                          \
  85         pr_reg[6] = regs->eax;                          \
  86         pr_reg[7] = regs->xds;                          \
  87         pr_reg[8] = regs->xes;                          \
  88         savesegment(fs,pr_reg[9]);                      \
  89         savesegment(gs,pr_reg[10]);                     \
  90         pr_reg[11] = regs->orig_eax;                    \
  91         pr_reg[12] = regs->eip;                         \
  92         pr_reg[13] = regs->xcs;                         \
  93         pr_reg[14] = regs->eflags;                      \
  94         pr_reg[15] = regs->esp;                         \
  95         pr_reg[16] = regs->xss;
  96
  97 /* This yields a mask that user programs can use to figure out what
  98    instruction set this CPU supports.  This could be done in user space,
  99    but it's not easy, and we've already done it here.  */
 100
 101 #define ELF_HWCAP       (boot_cpu_data.x86_capability[0])
 102
 103 /* This yields a string that ld.so will use to load implementation
 104    specific libraries for optimization.  This is more specific in
 105    intent than poking at uname or /proc/cpuinfo.
 106
 107    For the moment, we have only optimizations for the Intel generations,
 108    but that could change... */
 109
 110 #define ELF_PLATFORM  (system_utsname.machine)
 111
 112 /*
 113  * Architecture-neutral AT_ values in 0-17, leave some room
 114  * for more of them, start the x86-specific ones at 32.
 115  */
 116 #define AT_SYSINFO              32
 117 #define AT_SYSINFO_EHDR         33
 118
 119 #ifdef __KERNEL__
 120 #define SET_PERSONALITY(ex, ibcs2) do { } while (0)
 121
 122 /*
 123  * An executable for which elf_read_implies_exec() returns TRUE will
 124  * have the READ_IMPLIES_EXEC personality flag set automatically.
 125  */
 126 #define elf_read_implies_exec(ex, executable_stack)     (executable_stack != EXSTACK_DISABLE_X)
 127
 128 extern int dump_task_regs (struct task_struct *, elf_gregset_t *);
 129 extern int dump_task_fpu (struct task_struct *, elf_fpregset_t *);
 130 extern int dump_task_extended_fpu (struct task_struct *, struct user_fxsr_struct *);
 131
 132 #define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
 133 #define ELF_CORE_COPY_FPREGS(tsk, elf_fpregs) dump_task_fpu(tsk, elf_fpregs)
 134 #define ELF_CORE_COPY_XFPREGS(tsk, elf_xfpregs) dump_task_extended_fpu(tsk, elf_xfpregs)
 135
 136 #define VSYSCALL_BASE   (__fix_to_virt(FIX_VSYSCALL))
 137 #define VSYSCALL_EHDR   ((const struct elfhdr *) VSYSCALL_BASE)
 138 #define VSYSCALL_ENTRY  ((unsigned long) &__kernel_vsyscall)
 139 extern void __kernel_vsyscall;
 140
 141 #define ARCH_DLINFO                                             \
 142 do {                                                            \
 143                 NEW_AUX_ENT(AT_SYSINFO, VSYSCALL_ENTRY);        \
 144                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL_BASE);    \
 145 } while (0)
 146
 147 /*
 148  * These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out
 149  * extra segments containing the vsyscall DSO contents.  Dumping its
 150  * contents makes post-mortem fully interpretable later without matching up
 151  * the same kernel and hardware config to see what PC values meant.
 152  * Dumping its extra ELF program headers includes all the other information
 153  * a debugger needs to easily find how the vsyscall DSO was being used.
 154  */
 155 #define ELF_CORE_EXTRA_PHDRS            (VSYSCALL_EHDR->e_phnum)
 156 #define ELF_CORE_WRITE_EXTRA_PHDRS                                            \
 157 do {                                                                          \
 158         const struct elf_phdr *const vsyscall_phdrs =                         \
 159                 (const struct elf_phdr *) (VSYSCALL_BASE                      \
 160                                            + VSYSCALL_EHDR->e_phoff);         \
 161         int i;                                                                \
 162         Elf32_Off ofs = 0;                                                    \
 163         for (i = 0; i < VSYSCALL_EHDR->e_phnum; ++i) {                        \
 164                 struct elf_phdr phdr = vsyscall_phdrs[i];                     \
 165                 if (phdr.p_type == PT_LOAD) {                                 \
 166                         BUG_ON(ofs != 0);                                     \
 167                         ofs = phdr.p_offset = offset;                         \
 168                         phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz);              \
 169                         phdr.p_filesz = phdr.p_memsz;                         \
 170                         offset += phdr.p_filesz;                              \
 171                 }                                                             \
 172                 else                                                          \
 173                         phdr.p_offset += ofs;                                 \
 174                 phdr.p_paddr = 0; /* match other core phdrs */                \
 175                 DUMP_WRITE(&phdr, sizeof(phdr));                              \
 176         }                                                                     \
 177 } while (0)
 178 #define ELF_CORE_WRITE_EXTRA_DATA                                             \
 179 do {                                                                          \
 180         const struct elf_phdr *const vsyscall_phdrs =                         \
 181                 (const struct elf_phdr *) (VSYSCALL_BASE                      \
 182                                            + VSYSCALL_EHDR->e_phoff);         \
 183         int i;                                                                \
 184         for (i = 0; i < VSYSCALL_EHDR->e_phnum; ++i) {                        \
 185                 if (vsyscall_phdrs[i].p_type == PT_LOAD)                      \
 186                         DUMP_WRITE((void *) vsyscall_phdrs[i].p_vaddr,        \
 187                                    PAGE_ALIGN(vsyscall_phdrs[i].p_memsz));    \
 188         }                                                                     \
 189 } while (0)
 190
 191 #endif
 192
 193 #endif