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 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)                    \
 173 do {                                                    \
 174         elf_common_init(&current->thread, _r, 0);       \
 175         clear_thread_flag(TIF_IA32);                    \
 176 } while (0)
 177
 178 #define COMPAT_ELF_PLAT_INIT(regs, load_addr)           \
 179         elf_common_init(&current->thread, regs, __USER_DS)
 180
 181 void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp);
 182 #define compat_start_thread start_thread_ia32
 183
 184 #define COMPAT_SET_PERSONALITY(ex)                      \
 185 do {                                                    \
 186         if (test_thread_flag(TIF_IA32))                 \
 187                 clear_thread_flag(TIF_ABI_PENDING);     \
 188         else                                            \
 189                 set_thread_flag(TIF_ABI_PENDING);       \
 190         current->personality |= force_personality32;    \
 191 } while (0)
 192
 193 #define COMPAT_ELF_PLATFORM                     ("i686")
 194
 195 /*
 196  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 197  * now struct_user_regs, they are different). Assumes current is the process
 198  * getting dumped.
 199  */
 200
 201 #define ELF_CORE_COPY_REGS(pr_reg, regs)                        \
 202 do {                                                            \
 203         unsigned v;                                             \
 204         (pr_reg)[0] = (regs)->r15;                              \
 205         (pr_reg)[1] = (regs)->r14;                              \
 206         (pr_reg)[2] = (regs)->r13;                              \
 207         (pr_reg)[3] = (regs)->r12;                              \
 208         (pr_reg)[4] = (regs)->bp;                               \
 209         (pr_reg)[5] = (regs)->bx;                               \
 210         (pr_reg)[6] = (regs)->r11;                              \
 211         (pr_reg)[7] = (regs)->r10;                              \
 212         (pr_reg)[8] = (regs)->r9;                               \
 213         (pr_reg)[9] = (regs)->r8;                               \
 214         (pr_reg)[10] = (regs)->ax;                              \
 215         (pr_reg)[11] = (regs)->cx;                              \
 216         (pr_reg)[12] = (regs)->dx;                              \
 217         (pr_reg)[13] = (regs)->si;                              \
 218         (pr_reg)[14] = (regs)->di;                              \
 219         (pr_reg)[15] = (regs)->orig_ax;                         \
 220         (pr_reg)[16] = (regs)->ip;                              \
 221         (pr_reg)[17] = (regs)->cs;                              \
 222         (pr_reg)[18] = (regs)->flags;                           \
 223         (pr_reg)[19] = (regs)->sp;                              \
 224         (pr_reg)[20] = (regs)->ss;                              \
 225         (pr_reg)[21] = current->thread.fs;                      \
 226         (pr_reg)[22] = current->thread.gs;                      \
 227         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
 228         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
 229         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
 230         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
 231 } while (0);
 232
 233 /* I'm not sure if we can use '-' here */
 234 #define ELF_PLATFORM       ("x86_64")
 235 extern void set_personality_64bit(void);
 236 extern unsigned int sysctl_vsyscall32;
 237 extern int force_personality32;
 238
 239 #endif /* !CONFIG_X86_32 */
 240
 241 #define CORE_DUMP_USE_REGSET
 242 #define USE_ELF_CORE_DUMP
 243 #define ELF_EXEC_PAGESIZE       4096
 244
 245 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 246    use of this is to invoke "./ld.so someprog" to test out a new version of
 247    the loader.  We need to make sure that it is out of the way of the program
 248    that it will "exec", and that there is sufficient room for the brk.  */
 249
 250 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 251
 252 /* This yields a mask that user programs can use to figure out what
 253    instruction set this CPU supports.  This could be done in user space,
 254    but it's not easy, and we've already done it here.  */
 255
 256 #define ELF_HWCAP               (boot_cpu_data.x86_capability[0])
 257
 258 /* This yields a string that ld.so will use to load implementation
 259    specific libraries for optimization.  This is more specific in
 260    intent than poking at uname or /proc/cpuinfo.
 261
 262    For the moment, we have only optimizations for the Intel generations,
 263    but that could change... */
 264
 265 #define SET_PERSONALITY(ex) set_personality_64bit()
 266
 267 /*
 268  * An executable for which elf_read_implies_exec() returns TRUE will
 269  * have the READ_IMPLIES_EXEC personality flag set automatically.
 270  */
 271 #define elf_read_implies_exec(ex, executable_stack)     \
 272         (executable_stack != EXSTACK_DISABLE_X)
 273
 274 struct task_struct;
 275
 276 #define ARCH_DLINFO_IA32(vdso_enabled)                                  \
 277 do {                                                                    \
 278         if (vdso_enabled) {                                             \
 279                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
 280                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
 281         }                                                               \
 282 } while (0)
 283
 284 #ifdef CONFIG_X86_32
 285
 286 #define STACK_RND_MASK (0x7ff)
 287
 288 #define VDSO_HIGH_BASE          (__fix_to_virt(FIX_VDSO))
 289
 290 #define ARCH_DLINFO             ARCH_DLINFO_IA32(vdso_enabled)
 291
 292 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 293
 294 #else /* CONFIG_X86_32 */
 295
 296 #define VDSO_HIGH_BASE          0xffffe000U /* CONFIG_COMPAT_VDSO address */
 297
 298 /* 1GB for 64bit, 8MB for 32bit */
 299 #define STACK_RND_MASK (test_thread_flag(TIF_IA32) ? 0x7ff : 0x3fffff)
 300
 301 #define ARCH_DLINFO                                                     \
 302 do {                                                                    \
 303         if (vdso_enabled)                                               \
 304                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 305                             (unsigned long)current->mm->context.vdso);  \
 306 } while (0)
 307
 308 #define AT_SYSINFO              32
 309
 310 #define COMPAT_ARCH_DLINFO      ARCH_DLINFO_IA32(sysctl_vsyscall32)
 311
 312 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
 313
 314 #endif /* !CONFIG_X86_32 */
 315
 316 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
 317
 318 #define VDSO_ENTRY                                                      \
 319         ((unsigned long)VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall))
 320
 321 struct linux_binprm;
 322
 323 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 324 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 325                                        int uses_interp);
 326
 327 extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
 328 #define compat_arch_setup_additional_pages      syscall32_setup_pages
 329
 330 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
 331 #define arch_randomize_brk arch_randomize_brk
 332
 333 #endif /* _ASM_X86_ELF_H */