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/auxvec.h>
  11
  12 #include <linux/utsname.h>
  13
  14 #define R_386_NONE      0
  15 #define R_386_32        1
  16 #define R_386_PC32      2
  17 #define R_386_GOT32     3
  18 #define R_386_PLT32     4
  19 #define R_386_COPY      5
  20 #define R_386_GLOB_DAT  6
  21 #define R_386_JMP_SLOT  7
  22 #define R_386_RELATIVE  8
  23 #define R_386_GOTOFF    9
  24 #define R_386_GOTPC     10
  25 #define R_386_NUM       11
  26
  27 typedef unsigned long elf_greg_t;
  28
  29 #define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
  30 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  31
  32 typedef struct user_i387_struct elf_fpregset_t;
  33 typedef struct user_fxsr_struct elf_fpxregset_t;
  34
  35 /*
  36  * This is used to ensure we don't load something for the wrong architecture.
  37  */
  38 #define elf_check_arch(x) \
  39         (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
  40
  41 /*
  42  * These are used to set parameters in the core dumps.
  43  */
  44 #define ELF_CLASS       ELFCLASS32
  45 #define ELF_DATA        ELFDATA2LSB
  46 #define ELF_ARCH        EM_386
  47
  48 #ifdef __KERNEL__
  49
  50 #include <asm/processor.h>
  51 #include <asm/system.h>         /* for savesegment */
  52 #include <asm/desc.h>
  53
  54 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
  55    contains a pointer to a function which might be registered using `atexit'.
  56    This provides a mean for the dynamic linker to call DT_FINI functions for
  57    shared libraries that have been loaded before the code runs.
  58
  59    A value of 0 tells we have no such handler.
  60
  61    We might as well make sure everything else is cleared too (except for %esp),
  62    just to make things more deterministic.
  63  */
  64 #define ELF_PLAT_INIT(_r, load_addr)    do { \
  65         _r->ebx = 0; _r->ecx = 0; _r->edx = 0; \
  66         _r->esi = 0; _r->edi = 0; _r->ebp = 0; \
  67         _r->eax = 0; \
  68 } while (0)
  69
  70 #define USE_ELF_CORE_DUMP
  71 #define ELF_EXEC_PAGESIZE       4096
  72
  73 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  74    use of this is to invoke "./ld.so someprog" to test out a new version of
  75    the loader.  We need to make sure that it is out of the way of the program
  76    that it will "exec", and that there is sufficient room for the brk.  */
  77
  78 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
  79
  80 /* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
  81    now struct_user_regs, they are different) */
  82
  83 #define ELF_CORE_COPY_REGS(pr_reg, regs)                \
  84         pr_reg[0] = regs->ebx;                          \
  85         pr_reg[1] = regs->ecx;                          \
  86         pr_reg[2] = regs->edx;                          \
  87         pr_reg[3] = regs->esi;                          \
  88         pr_reg[4] = regs->edi;                          \
  89         pr_reg[5] = regs->ebp;                          \
  90         pr_reg[6] = regs->eax;                          \
  91         pr_reg[7] = regs->xds;                          \
  92         pr_reg[8] = regs->xes;                          \
  93         savesegment(fs,pr_reg[9]);                      \
  94         pr_reg[10] = regs->xgs;                         \
  95         pr_reg[11] = regs->orig_eax;                    \
  96         pr_reg[12] = regs->eip;                         \
  97         pr_reg[13] = regs->xcs;                         \
  98         pr_reg[14] = regs->eflags;                      \
  99         pr_reg[15] = regs->esp;                         \
 100         pr_reg[16] = regs->xss;
 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       (boot_cpu_data.x86_capability[0])
 107
 108 /* This yields a string that ld.so will use to load implementation
 109    specific libraries for optimization.  This is more specific in
 110    intent than poking at uname or /proc/cpuinfo.
 111
 112    For the moment, we have only optimizations for the Intel generations,
 113    but that could change... */
 114
 115 #define ELF_PLATFORM  (utsname()->machine)
 116
 117 #define SET_PERSONALITY(ex, ibcs2) do { } while (0)
 118
 119 /*
 120  * An executable for which elf_read_implies_exec() returns TRUE will
 121  * have the READ_IMPLIES_EXEC personality flag set automatically.
 122  */
 123 #define elf_read_implies_exec(ex, executable_stack)     (executable_stack != EXSTACK_DISABLE_X)
 124
 125 struct task_struct;
 126
 127 extern int dump_task_regs (struct task_struct *, elf_gregset_t *);
 128 extern int dump_task_fpu (struct task_struct *, elf_fpregset_t *);
 129 extern int dump_task_extended_fpu (struct task_struct *, struct user_fxsr_struct *);
 130
 131 #define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
 132 #define ELF_CORE_COPY_FPREGS(tsk, elf_fpregs) dump_task_fpu(tsk, elf_fpregs)
 133 #define ELF_CORE_COPY_XFPREGS(tsk, elf_xfpregs) dump_task_extended_fpu(tsk, elf_xfpregs)
 134
 135 #define VDSO_HIGH_BASE          (__fix_to_virt(FIX_VDSO))
 136 #define VDSO_BASE               ((unsigned long)current->mm->context.vdso)
 137
 138 #ifdef CONFIG_COMPAT_VDSO
 139 # define VDSO_COMPAT_BASE       VDSO_HIGH_BASE
 140 # define VDSO_PRELINK           VDSO_HIGH_BASE
 141 #else
 142 # define VDSO_COMPAT_BASE       VDSO_BASE
 143 # define VDSO_PRELINK           0
 144 #endif
 145
 146 #define VDSO_COMPAT_SYM(x) \
 147                 (VDSO_COMPAT_BASE + (unsigned long)(x) - VDSO_PRELINK)
 148
 149 #define VDSO_SYM(x) \
 150                 (VDSO_BASE + (unsigned long)(x) - VDSO_PRELINK)
 151
 152 #define VDSO_HIGH_EHDR          ((const struct elfhdr *) VDSO_HIGH_BASE)
 153 #define VDSO_EHDR               ((const struct elfhdr *) VDSO_COMPAT_BASE)
 154
 155 extern void __kernel_vsyscall;
 156
 157 #define VDSO_ENTRY              VDSO_SYM(&__kernel_vsyscall)
 158
 159 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 160 struct linux_binprm;
 161 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 162                                        int executable_stack);
 163
 164 extern unsigned int vdso_enabled;
 165
 166 #define ARCH_DLINFO                                             \
 167 do if (vdso_enabled) {                                          \
 168                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);            \
 169                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_COMPAT_BASE); \
 170 } while (0)
 171
 172 /*
 173  * These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out
 174  * extra segments containing the vsyscall DSO contents.  Dumping its
 175  * contents makes post-mortem fully interpretable later without matching up
 176  * the same kernel and hardware config to see what PC values meant.
 177  * Dumping its extra ELF program headers includes all the other information
 178  * a debugger needs to easily find how the vsyscall DSO was being used.
 179  */
 180 #define ELF_CORE_EXTRA_PHDRS            (VDSO_HIGH_EHDR->e_phnum)
 181 #define ELF_CORE_WRITE_EXTRA_PHDRS                                            \
 182 do {                                                                          \
 183         const struct elf_phdr *const vsyscall_phdrs =                         \
 184                 (const struct elf_phdr *) (VDSO_HIGH_BASE                     \
 185                                            + VDSO_HIGH_EHDR->e_phoff);    \
 186         int i;                                                                \
 187         Elf32_Off ofs = 0;                                                    \
 188         for (i = 0; i < VDSO_HIGH_EHDR->e_phnum; ++i) {               \
 189                 struct elf_phdr phdr = vsyscall_phdrs[i];                     \
 190                 if (phdr.p_type == PT_LOAD) {                                 \
 191                         BUG_ON(ofs != 0);                                     \
 192                         ofs = phdr.p_offset = offset;                         \
 193                         phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz);              \
 194                         phdr.p_filesz = phdr.p_memsz;                         \
 195                         offset += phdr.p_filesz;                              \
 196                 }                                                             \
 197                 else                                                          \
 198                         phdr.p_offset += ofs;                                 \
 199                 phdr.p_paddr = 0; /* match other core phdrs */                \
 200                 DUMP_WRITE(&phdr, sizeof(phdr));                              \
 201         }                                                                     \
 202 } while (0)
 203 #define ELF_CORE_WRITE_EXTRA_DATA                                             \
 204 do {                                                                          \
 205         const struct elf_phdr *const vsyscall_phdrs =                         \
 206                 (const struct elf_phdr *) (VDSO_HIGH_BASE                     \
 207                                            + VDSO_HIGH_EHDR->e_phoff);    \
 208         int i;                                                                \
 209         for (i = 0; i < VDSO_HIGH_EHDR->e_phnum; ++i) {               \
 210                 if (vsyscall_phdrs[i].p_type == PT_LOAD)                      \
 211                         DUMP_WRITE((void *) vsyscall_phdrs[i].p_vaddr,        \
 212                                    PAGE_ALIGN(vsyscall_phdrs[i].p_memsz));    \
 213         }                                                                     \
 214 } while (0)
 215
 216 #endif
 217
 218 #endif