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