arch/x86/include/asm/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 #include <asm/processor.h>
  86 #include <asm/system.h>
  87
  88 #ifdef CONFIG_X86_32
  89 #include <asm/desc.h>
  90
  91 #define elf_check_arch(x)       elf_check_arch_ia32(x)
  92
  93 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
  94    contains a pointer to a function which might be registered using `atexit'.
  95    This provides a mean for the dynamic linker to call DT_FINI functions for
  96    shared libraries that have been loaded before the code runs.
  97
  98    A value of 0 tells we have no such handler.
  99
 100    We might as well make sure everything else is cleared too (except for %esp),
 101    just to make things more deterministic.
 102  */
 103 #define ELF_PLAT_INIT(_r, load_addr)            \
 104         do {                                    \
 105         _r->bx = 0; _r->cx = 0; _r->dx = 0;     \
 106         _r->si = 0; _r->di = 0; _r->bp = 0;     \
 107         _r->ax = 0;                             \
 108 } while (0)
 109
 110 /*
 111  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 112  * now struct_user_regs, they are different)
 113  */
 114
 115 #define ELF_CORE_COPY_REGS_COMMON(pr_reg, regs) \
 116 do {                                            \
 117         pr_reg[0] = regs->bx;                   \
 118         pr_reg[1] = regs->cx;                   \
 119         pr_reg[2] = regs->dx;                   \
 120         pr_reg[3] = regs->si;                   \
 121         pr_reg[4] = regs->di;                   \
 122         pr_reg[5] = regs->bp;                   \
 123         pr_reg[6] = regs->ax;                   \
 124         pr_reg[7] = regs->ds & 0xffff;          \
 125         pr_reg[8] = regs->es & 0xffff;          \
 126         pr_reg[9] = regs->fs & 0xffff;          \
 127         pr_reg[11] = regs->orig_ax;             \
 128         pr_reg[12] = regs->ip;                  \
 129         pr_reg[13] = regs->cs & 0xffff;         \
 130         pr_reg[14] = regs->flags;               \
 131         pr_reg[15] = regs->sp;                  \
 132         pr_reg[16] = regs->ss & 0xffff;         \
 133 } while (0);
 134
 135 #define ELF_CORE_COPY_REGS(pr_reg, regs)        \
 136 do {                                            \
 137         ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
 138         pr_reg[10] = get_user_gs(regs);         \
 139 } while (0);
 140
 141 #define ELF_CORE_COPY_KERNEL_REGS(pr_reg, regs) \
 142 do {                                            \
 143         ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
 144         savesegment(gs, pr_reg[10]);            \
 145 } while (0);
 146
 147 #define ELF_PLATFORM    (utsname()->machine)
 148 #define set_personality_64bit() do { } while (0)
 149
 150 #else /* CONFIG_X86_32 */
 151
 152 /*
 153  * This is used to ensure we don't load something for the wrong architecture.
 154  */
 155 #define elf_check_arch(x)                       \
 156         ((x)->e_machine == EM_X86_64)
 157
 158 #define compat_elf_check_arch(x)        elf_check_arch_ia32(x)
 159
 160 static inline void start_ia32_thread(struct pt_regs *regs, u32 ip, u32 sp)
 161 {
 162         loadsegment(fs, 0);
 163         loadsegment(ds, __USER32_DS);
 164         loadsegment(es, __USER32_DS);
 165         load_gs_index(0);
 166         regs->ip = ip;
 167         regs->sp = sp;
 168         regs->flags = X86_EFLAGS_IF;
 169         regs->cs = __USER32_CS;
 170         regs->ss = __USER32_DS;
 171 }
 172
 173 static inline void elf_common_init(struct thread_struct *t,
 174                                    struct pt_regs *regs, const u16 ds)
 175 {
 176         regs->ax = regs->bx = regs->cx = regs->dx = 0;
 177         regs->si = regs->di = regs->bp = 0;
 178         regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
 179         regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
 180         t->fs = t->gs = 0;
 181         t->fsindex = t->gsindex = 0;
 182         t->ds = t->es = ds;
 183 }
 184
 185 #define ELF_PLAT_INIT(_r, load_addr)                    \
 186 do {                                                    \
 187         elf_common_init(&current->thread, _r, 0);       \
 188         clear_thread_flag(TIF_IA32);                    \
 189 } while (0)
 190
 191 #define COMPAT_ELF_PLAT_INIT(regs, load_addr)           \
 192         elf_common_init(&current->thread, regs, __USER_DS)
 193
 194 #define compat_start_thread(regs, ip, sp)               \
 195 do {                                                    \
 196         start_ia32_thread(regs, ip, sp);                \
 197         set_fs(USER_DS);                                \
 198 } while (0)
 199
 200 #define COMPAT_SET_PERSONALITY(ex)                      \
 201 do {                                                    \
 202         if (test_thread_flag(TIF_IA32))                 \
 203                 clear_thread_flag(TIF_ABI_PENDING);     \
 204         else                                            \
 205                 set_thread_flag(TIF_ABI_PENDING);       \
 206         current->personality |= force_personality32;    \
 207 } while (0)
 208
 209 #define COMPAT_ELF_PLATFORM                     ("i686")
 210
 211 /*
 212  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 213  * now struct_user_regs, they are different). Assumes current is the process
 214  * getting dumped.
 215  */
 216
 217 #define ELF_CORE_COPY_REGS(pr_reg, regs)                        \
 218 do {                                                            \
 219         unsigned v;                                             \
 220         (pr_reg)[0] = (regs)->r15;                              \
 221         (pr_reg)[1] = (regs)->r14;                              \
 222         (pr_reg)[2] = (regs)->r13;                              \
 223         (pr_reg)[3] = (regs)->r12;                              \
 224         (pr_reg)[4] = (regs)->bp;                               \
 225         (pr_reg)[5] = (regs)->bx;                               \
 226         (pr_reg)[6] = (regs)->r11;                              \
 227         (pr_reg)[7] = (regs)->r10;                              \
 228         (pr_reg)[8] = (regs)->r9;                               \
 229         (pr_reg)[9] = (regs)->r8;                               \
 230         (pr_reg)[10] = (regs)->ax;                              \
 231         (pr_reg)[11] = (regs)->cx;                              \
 232         (pr_reg)[12] = (regs)->dx;                              \
 233         (pr_reg)[13] = (regs)->si;                              \
 234         (pr_reg)[14] = (regs)->di;                              \
 235         (pr_reg)[15] = (regs)->orig_ax;                         \
 236         (pr_reg)[16] = (regs)->ip;                              \
 237         (pr_reg)[17] = (regs)->cs;                              \
 238         (pr_reg)[18] = (regs)->flags;                           \
 239         (pr_reg)[19] = (regs)->sp;                              \
 240         (pr_reg)[20] = (regs)->ss;                              \
 241         (pr_reg)[21] = current->thread.fs;                      \
 242         (pr_reg)[22] = current->thread.gs;                      \
 243         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
 244         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
 245         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
 246         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
 247 } while (0);
 248
 249 /* I'm not sure if we can use '-' here */
 250 #define ELF_PLATFORM       ("x86_64")
 251 extern void set_personality_64bit(void);
 252 extern unsigned int sysctl_vsyscall32;
 253 extern int force_personality32;
 254
 255 #endif /* !CONFIG_X86_32 */
 256
 257 #define CORE_DUMP_USE_REGSET
 258 #define USE_ELF_CORE_DUMP
 259 #define ELF_EXEC_PAGESIZE       4096
 260
 261 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 262    use of this is to invoke "./ld.so someprog" to test out a new version of
 263    the loader.  We need to make sure that it is out of the way of the program
 264    that it will "exec", and that there is sufficient room for the brk.  */
 265
 266 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 267
 268 /* This yields a mask that user programs can use to figure out what
 269    instruction set this CPU supports.  This could be done in user space,
 270    but it's not easy, and we've already done it here.  */
 271
 272 #define ELF_HWCAP               (boot_cpu_data.x86_capability[0])
 273
 274 /* This yields a string that ld.so will use to load implementation
 275    specific libraries for optimization.  This is more specific in
 276    intent than poking at uname or /proc/cpuinfo.
 277
 278    For the moment, we have only optimizations for the Intel generations,
 279    but that could change... */
 280
 281 #define SET_PERSONALITY(ex) set_personality_64bit()
 282
 283 /*
 284  * An executable for which elf_read_implies_exec() returns TRUE will
 285  * have the READ_IMPLIES_EXEC personality flag set automatically.
 286  */
 287 #define elf_read_implies_exec(ex, executable_stack)     \
 288         (executable_stack != EXSTACK_DISABLE_X)
 289
 290 struct task_struct;
 291
 292 #define ARCH_DLINFO_IA32(vdso_enabled)                                  \
 293 do {                                                                    \
 294         if (vdso_enabled) {                                             \
 295                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
 296                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
 297         }                                                               \
 298 } while (0)
 299
 300 #ifdef CONFIG_X86_32
 301
 302 #define VDSO_HIGH_BASE          (__fix_to_virt(FIX_VDSO))
 303
 304 #define ARCH_DLINFO             ARCH_DLINFO_IA32(vdso_enabled)
 305
 306 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 307
 308 #else /* CONFIG_X86_32 */
 309
 310 #define VDSO_HIGH_BASE          0xffffe000U /* CONFIG_COMPAT_VDSO address */
 311
 312 /* 1GB for 64bit, 8MB for 32bit */
 313 #define STACK_RND_MASK (test_thread_flag(TIF_IA32) ? 0x7ff : 0x3fffff)
 314
 315 #define ARCH_DLINFO                                                     \
 316 do {                                                                    \
 317         if (vdso_enabled)                                               \
 318                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 319                             (unsigned long)current->mm->context.vdso);  \
 320 } while (0)
 321
 322 #define AT_SYSINFO              32
 323
 324 #define COMPAT_ARCH_DLINFO      ARCH_DLINFO_IA32(sysctl_vsyscall32)
 325
 326 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
 327
 328 #endif /* !CONFIG_X86_32 */
 329
 330 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
 331
 332 #define VDSO_ENTRY                                                      \
 333         ((unsigned long)VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall))
 334
 335 struct linux_binprm;
 336
 337 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 338 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 339                                        int uses_interp);
 340
 341 extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
 342 #define compat_arch_setup_additional_pages      syscall32_setup_pages
 343
 344 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
 345 #define arch_randomize_brk arch_randomize_brk
 346
 347 #endif /* _ASM_X86_ELF_H */