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(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         savesegment(gs, pr_reg[10]);            \
 128         pr_reg[11] = regs->orig_ax;             \
 129         pr_reg[12] = regs->ip;                  \
 130         pr_reg[13] = regs->cs & 0xffff;         \
 131         pr_reg[14] = regs->flags;               \
 132         pr_reg[15] = regs->sp;                  \
 133         pr_reg[16] = regs->ss & 0xffff;         \
 134 } while (0);
 135
 136 #define ELF_PLATFORM    (utsname()->machine)
 137 #define set_personality_64bit() do { } while (0)
 138
 139 #else /* CONFIG_X86_32 */
 140
 141 /*
 142  * This is used to ensure we don't load something for the wrong architecture.
 143  */
 144 #define elf_check_arch(x)                       \
 145         ((x)->e_machine == EM_X86_64)
 146
 147 #define compat_elf_check_arch(x)        elf_check_arch_ia32(x)
 148
 149 static inline void start_ia32_thread(struct pt_regs *regs, u32 ip, u32 sp)
 150 {
 151         loadsegment(fs, 0);
 152         loadsegment(ds, __USER32_DS);
 153         loadsegment(es, __USER32_DS);
 154         load_gs_index(0);
 155         regs->ip = ip;
 156         regs->sp = sp;
 157         regs->flags = X86_EFLAGS_IF;
 158         regs->cs = __USER32_CS;
 159         regs->ss = __USER32_DS;
 160 }
 161
 162 static inline void elf_common_init(struct thread_struct *t,
 163                                    struct pt_regs *regs, const u16 ds)
 164 {
 165         regs->ax = regs->bx = regs->cx = regs->dx = 0;
 166         regs->si = regs->di = regs->bp = 0;
 167         regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
 168         regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
 169         t->fs = t->gs = 0;
 170         t->fsindex = t->gsindex = 0;
 171         t->ds = t->es = ds;
 172 }
 173
 174 #define ELF_PLAT_INIT(_r, load_addr)                    \
 175 do {                                                    \
 176         elf_common_init(&current->thread, _r, 0);       \
 177         clear_thread_flag(TIF_IA32);                    \
 178 } while (0)
 179
 180 #define COMPAT_ELF_PLAT_INIT(regs, load_addr)           \
 181         elf_common_init(&current->thread, regs, __USER_DS)
 182
 183 #define compat_start_thread(regs, ip, sp)               \
 184 do {                                                    \
 185         start_ia32_thread(regs, ip, sp);                \
 186         set_fs(USER_DS);                                \
 187 } while (0)
 188
 189 #define COMPAT_SET_PERSONALITY(ex)                      \
 190 do {                                                    \
 191         if (test_thread_flag(TIF_IA32))                 \
 192                 clear_thread_flag(TIF_ABI_PENDING);     \
 193         else                                            \
 194                 set_thread_flag(TIF_ABI_PENDING);       \
 195         current->personality |= force_personality32;    \
 196 } while (0)
 197
 198 #define COMPAT_ELF_PLATFORM                     ("i686")
 199
 200 /*
 201  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 202  * now struct_user_regs, they are different). Assumes current is the process
 203  * getting dumped.
 204  */
 205
 206 #define ELF_CORE_COPY_REGS(pr_reg, regs)                        \
 207 do {                                                            \
 208         unsigned v;                                             \
 209         (pr_reg)[0] = (regs)->r15;                              \
 210         (pr_reg)[1] = (regs)->r14;                              \
 211         (pr_reg)[2] = (regs)->r13;                              \
 212         (pr_reg)[3] = (regs)->r12;                              \
 213         (pr_reg)[4] = (regs)->bp;                               \
 214         (pr_reg)[5] = (regs)->bx;                               \
 215         (pr_reg)[6] = (regs)->r11;                              \
 216         (pr_reg)[7] = (regs)->r10;                              \
 217         (pr_reg)[8] = (regs)->r9;                               \
 218         (pr_reg)[9] = (regs)->r8;                               \
 219         (pr_reg)[10] = (regs)->ax;                              \
 220         (pr_reg)[11] = (regs)->cx;                              \
 221         (pr_reg)[12] = (regs)->dx;                              \
 222         (pr_reg)[13] = (regs)->si;                              \
 223         (pr_reg)[14] = (regs)->di;                              \
 224         (pr_reg)[15] = (regs)->orig_ax;                         \
 225         (pr_reg)[16] = (regs)->ip;                              \
 226         (pr_reg)[17] = (regs)->cs;                              \
 227         (pr_reg)[18] = (regs)->flags;                           \
 228         (pr_reg)[19] = (regs)->sp;                              \
 229         (pr_reg)[20] = (regs)->ss;                              \
 230         (pr_reg)[21] = current->thread.fs;                      \
 231         (pr_reg)[22] = current->thread.gs;                      \
 232         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
 233         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
 234         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
 235         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
 236 } while (0);
 237
 238 /* I'm not sure if we can use '-' here */
 239 #define ELF_PLATFORM       ("x86_64")
 240 extern void set_personality_64bit(void);
 241 extern unsigned int sysctl_vsyscall32;
 242 extern int force_personality32;
 243
 244 #endif /* !CONFIG_X86_32 */
 245
 246 #define CORE_DUMP_USE_REGSET
 247 #define USE_ELF_CORE_DUMP
 248 #define ELF_EXEC_PAGESIZE       4096
 249
 250 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 251    use of this is to invoke "./ld.so someprog" to test out a new version of
 252    the loader.  We need to make sure that it is out of the way of the program
 253    that it will "exec", and that there is sufficient room for the brk.  */
 254
 255 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 256
 257 /* This yields a mask that user programs can use to figure out what
 258    instruction set this CPU supports.  This could be done in user space,
 259    but it's not easy, and we've already done it here.  */
 260
 261 #define ELF_HWCAP               (boot_cpu_data.x86_capability[0])
 262
 263 /* This yields a string that ld.so will use to load implementation
 264    specific libraries for optimization.  This is more specific in
 265    intent than poking at uname or /proc/cpuinfo.
 266
 267    For the moment, we have only optimizations for the Intel generations,
 268    but that could change... */
 269
 270 #define SET_PERSONALITY(ex) set_personality_64bit()
 271
 272 /*
 273  * An executable for which elf_read_implies_exec() returns TRUE will
 274  * have the READ_IMPLIES_EXEC personality flag set automatically.
 275  */
 276 #define elf_read_implies_exec(ex, executable_stack)     \
 277         (executable_stack != EXSTACK_DISABLE_X)
 278
 279 struct task_struct;
 280
 281 #define ARCH_DLINFO_IA32(vdso_enabled)                                  \
 282 do {                                                                    \
 283         if (vdso_enabled) {                                             \
 284                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
 285                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
 286         }                                                               \
 287 } while (0)
 288
 289 #ifdef CONFIG_X86_32
 290
 291 #define VDSO_HIGH_BASE          (__fix_to_virt(FIX_VDSO))
 292
 293 #define ARCH_DLINFO             ARCH_DLINFO_IA32(vdso_enabled)
 294
 295 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 296
 297 #else /* CONFIG_X86_32 */
 298
 299 #define VDSO_HIGH_BASE          0xffffe000U /* CONFIG_COMPAT_VDSO address */
 300
 301 /* 1GB for 64bit, 8MB for 32bit */
 302 #define STACK_RND_MASK (test_thread_flag(TIF_IA32) ? 0x7ff : 0x3fffff)
 303
 304 #define ARCH_DLINFO                                                     \
 305 do {                                                                    \
 306         if (vdso_enabled)                                               \
 307                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 308                             (unsigned long)current->mm->context.vdso);  \
 309 } while (0)
 310
 311 #define AT_SYSINFO              32
 312
 313 #define COMPAT_ARCH_DLINFO      ARCH_DLINFO_IA32(sysctl_vsyscall32)
 314
 315 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
 316
 317 #endif /* !CONFIG_X86_32 */
 318
 319 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
 320
 321 #define VDSO_ENTRY                                                      \
 322         ((unsigned long)VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall))
 323
 324 struct linux_binprm;
 325
 326 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 327 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 328                                        int executable_stack);
 329
 330 extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
 331 #define compat_arch_setup_additional_pages      syscall32_setup_pages
 332
 333 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
 334 #define arch_randomize_brk arch_randomize_brk
 335
 336 #endif /* _ASM_X86_ELF_H */