include/asm-x86/elf.h

   1 #ifndef _ASM_X86_ELF_H
   2 #define _ASM_X86_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 typedef unsigned long elf_greg_t;
  13
  14 #define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
  15 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  16
  17 typedef struct user_i387_struct elf_fpregset_t;
  18
  19 #ifdef __i386__
  20
  21 typedef struct user_fxsr_struct elf_fpxregset_t;
  22
  23 #define R_386_NONE      0
  24 #define R_386_32        1
  25 #define R_386_PC32      2
  26 #define R_386_GOT32     3
  27 #define R_386_PLT32     4
  28 #define R_386_COPY      5
  29 #define R_386_GLOB_DAT  6
  30 #define R_386_JMP_SLOT  7
  31 #define R_386_RELATIVE  8
  32 #define R_386_GOTOFF    9
  33 #define R_386_GOTPC     10
  34 #define R_386_NUM       11
  35
  36 /*
  37  * These are used to set parameters in the core dumps.
  38  */
  39 #define ELF_CLASS       ELFCLASS32
  40 #define ELF_DATA        ELFDATA2LSB
  41 #define ELF_ARCH        EM_386
  42
  43 #else
  44
  45 /* x86-64 relocation types */
  46 #define R_X86_64_NONE           0       /* No reloc */
  47 #define R_X86_64_64             1       /* Direct 64 bit  */
  48 #define R_X86_64_PC32           2       /* PC relative 32 bit signed */
  49 #define R_X86_64_GOT32          3       /* 32 bit GOT entry */
  50 #define R_X86_64_PLT32          4       /* 32 bit PLT address */
  51 #define R_X86_64_COPY           5       /* Copy symbol at runtime */
  52 #define R_X86_64_GLOB_DAT       6       /* Create GOT entry */
  53 #define R_X86_64_JUMP_SLOT      7       /* Create PLT entry */
  54 #define R_X86_64_RELATIVE       8       /* Adjust by program base */
  55 #define R_X86_64_GOTPCREL       9       /* 32 bit signed pc relative
  56                                            offset to GOT */
  57 #define R_X86_64_32             10      /* Direct 32 bit zero extended */
  58 #define R_X86_64_32S            11      /* Direct 32 bit sign extended */
  59 #define R_X86_64_16             12      /* Direct 16 bit zero extended */
  60 #define R_X86_64_PC16           13      /* 16 bit sign extended pc relative */
  61 #define R_X86_64_8              14      /* Direct 8 bit sign extended  */
  62 #define R_X86_64_PC8            15      /* 8 bit sign extended pc relative */
  63
  64 #define R_X86_64_NUM            16
  65
  66 /*
  67  * These are used to set parameters in the core dumps.
  68  */
  69 #define ELF_CLASS       ELFCLASS64
  70 #define ELF_DATA        ELFDATA2LSB
  71 #define ELF_ARCH        EM_X86_64
  72
  73 #endif
  74
  75 #include <asm/vdso.h>
  76
  77 extern unsigned int vdso_enabled;
  78
  79 /*
  80  * This is used to ensure we don't load something for the wrong architecture.
  81  */
  82 #define elf_check_arch_ia32(x) \
  83         (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
  84
  85 #ifdef CONFIG_X86_32
  86 #include <asm/processor.h>
  87 #include <asm/system.h>         /* for savesegment */
  88 #include <asm/desc.h>
  89
  90 #define elf_check_arch(x)       elf_check_arch_ia32(x)
  91
  92 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
  93    contains a pointer to a function which might be registered using `atexit'.
  94    This provides a mean for the dynamic linker to call DT_FINI functions for
  95    shared libraries that have been loaded before the code runs.
  96
  97    A value of 0 tells we have no such handler.
  98
  99    We might as well make sure everything else is cleared too (except for %esp),
 100    just to make things more deterministic.
 101  */
 102 #define ELF_PLAT_INIT(_r, load_addr)    do { \
 103         _r->bx = 0; _r->cx = 0; _r->dx = 0; \
 104         _r->si = 0; _r->di = 0; _r->bp = 0; \
 105         _r->ax = 0; \
 106 } while (0)
 107
 108 /*
 109  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 110  * now struct_user_regs, they are different)
 111  */
 112
 113 #define ELF_CORE_COPY_REGS(pr_reg, regs) do {           \
 114         pr_reg[0] = regs->bx;                           \
 115         pr_reg[1] = regs->cx;                           \
 116         pr_reg[2] = regs->dx;                           \
 117         pr_reg[3] = regs->si;                           \
 118         pr_reg[4] = regs->di;                           \
 119         pr_reg[5] = regs->bp;                           \
 120         pr_reg[6] = regs->ax;                           \
 121         pr_reg[7] = regs->ds & 0xffff;                  \
 122         pr_reg[8] = regs->es & 0xffff;                  \
 123         pr_reg[9] = regs->fs & 0xffff;                  \
 124         savesegment(gs, pr_reg[10]);                    \
 125         pr_reg[11] = regs->orig_ax;                     \
 126         pr_reg[12] = regs->ip;                          \
 127         pr_reg[13] = regs->cs & 0xffff;                 \
 128         pr_reg[14] = regs->flags;                       \
 129         pr_reg[15] = regs->sp;                          \
 130         pr_reg[16] = regs->ss & 0xffff;                 \
 131 } while (0);
 132
 133 #define ELF_PLATFORM    (utsname()->machine)
 134 #define set_personality_64bit() do { } while (0)
 135
 136 #else /* CONFIG_X86_32 */
 137
 138 #include <asm/processor.h>
 139
 140 /*
 141  * This is used to ensure we don't load something for the wrong architecture.
 142  */
 143 #define elf_check_arch(x) \
 144         ((x)->e_machine == EM_X86_64)
 145
 146 #define compat_elf_check_arch(x)        elf_check_arch_ia32(x)
 147
 148 static inline void start_ia32_thread(struct pt_regs *regs, u32 ip, u32 sp)
 149 {
 150         asm volatile("movl %0,%%fs" :: "r" (0));
 151         asm volatile("movl %0,%%es; movl %0,%%ds" : : "r" (__USER32_DS));
 152         load_gs_index(0);
 153         regs->ip = ip;
 154         regs->sp = sp;
 155         regs->flags = X86_EFLAGS_IF;
 156         regs->cs = __USER32_CS;
 157         regs->ss = __USER32_DS;
 158 }
 159
 160 static inline void elf_common_init(struct thread_struct *t,
 161                                    struct pt_regs *regs, const u16 ds)
 162 {
 163         regs->ax = regs->bx = regs->cx = regs->dx = 0;
 164         regs->si = regs->di = regs->bp = 0;
 165         regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
 166         regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
 167         t->fs = t->gs = 0;
 168         t->fsindex = t->gsindex = 0;
 169         t->ds = t->es = ds;
 170 }
 171
 172 #define ELF_PLAT_INIT(_r, load_addr)    do {              \
 173         elf_common_init(&current->thread, _r, 0);         \
 174         clear_thread_flag(TIF_IA32);                      \
 175 } while (0)
 176
 177 #define COMPAT_ELF_PLAT_INIT(regs, load_addr)   \
 178         elf_common_init(&current->thread, regs, __USER_DS)
 179 #define compat_start_thread(regs, ip, sp)       do {            \
 180                 start_ia32_thread(regs, ip, sp);                \
 181                 set_fs(USER_DS);                                \
 182         } while (0)
 183 #define COMPAT_SET_PERSONALITY(ex, ibcs2)       do {            \
 184                 if (test_thread_flag(TIF_IA32))                 \
 185                         clear_thread_flag(TIF_ABI_PENDING);     \
 186                 else                                            \
 187                         set_thread_flag(TIF_ABI_PENDING);       \
 188                 current->personality |= force_personality32;    \
 189         } while (0)
 190 #define COMPAT_ELF_PLATFORM                     ("i686")
 191
 192 /*
 193  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 194  * now struct_user_regs, they are different). Assumes current is the process
 195  * getting dumped.
 196  */
 197
 198 #define ELF_CORE_COPY_REGS(pr_reg, regs)  do {                  \
 199         unsigned v;                                             \
 200         (pr_reg)[0] = (regs)->r15;                              \
 201         (pr_reg)[1] = (regs)->r14;                              \
 202         (pr_reg)[2] = (regs)->r13;                              \
 203         (pr_reg)[3] = (regs)->r12;                              \
 204         (pr_reg)[4] = (regs)->bp;                               \
 205         (pr_reg)[5] = (regs)->bx;                               \
 206         (pr_reg)[6] = (regs)->r11;                              \
 207         (pr_reg)[7] = (regs)->r10;                              \
 208         (pr_reg)[8] = (regs)->r9;                               \
 209         (pr_reg)[9] = (regs)->r8;                               \
 210         (pr_reg)[10] = (regs)->ax;                              \
 211         (pr_reg)[11] = (regs)->cx;                              \
 212         (pr_reg)[12] = (regs)->dx;                              \
 213         (pr_reg)[13] = (regs)->si;                              \
 214         (pr_reg)[14] = (regs)->di;                              \
 215         (pr_reg)[15] = (regs)->orig_ax;                         \
 216         (pr_reg)[16] = (regs)->ip;                              \
 217         (pr_reg)[17] = (regs)->cs;                              \
 218         (pr_reg)[18] = (regs)->flags;                           \
 219         (pr_reg)[19] = (regs)->sp;                              \
 220         (pr_reg)[20] = (regs)->ss;                              \
 221         (pr_reg)[21] = current->thread.fs;                      \
 222         (pr_reg)[22] = current->thread.gs;                      \
 223         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
 224         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
 225         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
 226         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
 227 } while (0);
 228
 229 /* I'm not sure if we can use '-' here */
 230 #define ELF_PLATFORM       ("x86_64")
 231 extern void set_personality_64bit(void);
 232 extern unsigned int sysctl_vsyscall32;
 233 extern int force_personality32;
 234
 235 #endif /* !CONFIG_X86_32 */
 236
 237 #define CORE_DUMP_USE_REGSET
 238 #define USE_ELF_CORE_DUMP
 239 #define ELF_EXEC_PAGESIZE       4096
 240
 241 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 242    use of this is to invoke "./ld.so someprog" to test out a new version of
 243    the loader.  We need to make sure that it is out of the way of the program
 244    that it will "exec", and that there is sufficient room for the brk.  */
 245
 246 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 247
 248 /* This yields a mask that user programs can use to figure out what
 249    instruction set this CPU supports.  This could be done in user space,
 250    but it's not easy, and we've already done it here.  */
 251
 252 #define ELF_HWCAP               (boot_cpu_data.x86_capability[0])
 253
 254 /* This yields a string that ld.so will use to load implementation
 255    specific libraries for optimization.  This is more specific in
 256    intent than poking at uname or /proc/cpuinfo.
 257
 258    For the moment, we have only optimizations for the Intel generations,
 259    but that could change... */
 260
 261 #define SET_PERSONALITY(ex, ibcs2) set_personality_64bit()
 262
 263 /*
 264  * An executable for which elf_read_implies_exec() returns TRUE will
 265  * have the READ_IMPLIES_EXEC personality flag set automatically.
 266  */
 267 #define elf_read_implies_exec(ex, executable_stack)     \
 268         (executable_stack != EXSTACK_DISABLE_X)
 269
 270 struct task_struct;
 271
 272 #define ARCH_DLINFO_IA32(vdso_enabled) \
 273 do if (vdso_enabled) {                                                  \
 274                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
 275                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
 276 } while (0)
 277
 278 #ifdef CONFIG_X86_32
 279
 280 #define VDSO_HIGH_BASE          (__fix_to_virt(FIX_VDSO))
 281
 282 #define ARCH_DLINFO             ARCH_DLINFO_IA32(vdso_enabled)
 283
 284 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 285
 286 #else /* CONFIG_X86_32 */
 287
 288 #define VDSO_HIGH_BASE          0xffffe000U /* CONFIG_COMPAT_VDSO address */
 289
 290 /* 1GB for 64bit, 8MB for 32bit */
 291 #define STACK_RND_MASK (test_thread_flag(TIF_IA32) ? 0x7ff : 0x3fffff)
 292
 293 #define ARCH_DLINFO                                             \
 294 do if (vdso_enabled) {                                          \
 295         NEW_AUX_ENT(AT_SYSINFO_EHDR,(unsigned long)current->mm->context.vdso);\
 296 } while (0)
 297
 298 #define AT_SYSINFO              32
 299
 300 #define COMPAT_ARCH_DLINFO      ARCH_DLINFO_IA32(sysctl_vsyscall32)
 301
 302 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
 303
 304 #endif /* !CONFIG_X86_32 */
 305
 306 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
 307
 308 #define VDSO_ENTRY \
 309         ((unsigned long) VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall))
 310
 311 struct linux_binprm;
 312
 313 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 314 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 315                                        int executable_stack);
 316
 317 extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
 318 #define compat_arch_setup_additional_pages      syscall32_setup_pages
 319
 320 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
 321 #define arch_randomize_brk arch_randomize_brk
 322
 323 #endif