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 #include <linux/thread_info.h>
   8
   9 #include <asm/ptrace.h>
  10 #include <asm/user.h>
  11 #include <asm/auxvec.h>
  12
  13 typedef unsigned long elf_greg_t;
  14
  15 #define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
  16 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  17
  18 typedef struct user_i387_struct elf_fpregset_t;
  19
  20 #ifdef __i386__
  21
  22 typedef struct user_fxsr_struct elf_fpxregset_t;
  23
  24 #define R_386_NONE      0
  25 #define R_386_32        1
  26 #define R_386_PC32      2
  27 #define R_386_GOT32     3
  28 #define R_386_PLT32     4
  29 #define R_386_COPY      5
  30 #define R_386_GLOB_DAT  6
  31 #define R_386_JMP_SLOT  7
  32 #define R_386_RELATIVE  8
  33 #define R_386_GOTOFF    9
  34 #define R_386_GOTPC     10
  35 #define R_386_NUM       11
  36
  37 /*
  38  * These are used to set parameters in the core dumps.
  39  */
  40 #define ELF_CLASS       ELFCLASS32
  41 #define ELF_DATA        ELFDATA2LSB
  42 #define ELF_ARCH        EM_386
  43
  44 #else
  45
  46 /* x86-64 relocation types */
  47 #define R_X86_64_NONE           0       /* No reloc */
  48 #define R_X86_64_64             1       /* Direct 64 bit  */
  49 #define R_X86_64_PC32           2       /* PC relative 32 bit signed */
  50 #define R_X86_64_GOT32          3       /* 32 bit GOT entry */
  51 #define R_X86_64_PLT32          4       /* 32 bit PLT address */
  52 #define R_X86_64_COPY           5       /* Copy symbol at runtime */
  53 #define R_X86_64_GLOB_DAT       6       /* Create GOT entry */
  54 #define R_X86_64_JUMP_SLOT      7       /* Create PLT entry */
  55 #define R_X86_64_RELATIVE       8       /* Adjust by program base */
  56 #define R_X86_64_GOTPCREL       9       /* 32 bit signed pc relative
  57                                            offset to GOT */
  58 #define R_X86_64_32             10      /* Direct 32 bit zero extended */
  59 #define R_X86_64_32S            11      /* Direct 32 bit sign extended */
  60 #define R_X86_64_16             12      /* Direct 16 bit zero extended */
  61 #define R_X86_64_PC16           13      /* 16 bit sign extended pc relative */
  62 #define R_X86_64_8              14      /* Direct 8 bit sign extended  */
  63 #define R_X86_64_PC8            15      /* 8 bit sign extended pc relative */
  64
  65 #define R_X86_64_NUM            16
  66
  67 /*
  68  * These are used to set parameters in the core dumps.
  69  */
  70 #define ELF_CLASS       ELFCLASS64
  71 #define ELF_DATA        ELFDATA2LSB
  72 #define ELF_ARCH        EM_X86_64
  73
  74 #endif
  75
  76 #include <asm/vdso.h>
  77
  78 #ifdef CONFIG_X86_64
  79 extern unsigned int vdso64_enabled;
  80 #endif
  81 #if defined(CONFIG_X86_32) || defined(CONFIG_COMPAT)
  82 extern unsigned int vdso32_enabled;
  83 #endif
  84
  85 /*
  86  * This is used to ensure we don't load something for the wrong architecture.
  87  */
  88 #define elf_check_arch_ia32(x) \
  89         (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
  90
  91 #include <asm/processor.h>
  92
  93 #ifdef CONFIG_X86_32
  94 #include <asm/desc.h>
  95
  96 #define elf_check_arch(x)       elf_check_arch_ia32(x)
  97
  98 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
  99    contains a pointer to a function which might be registered using `atexit'.
 100    This provides a mean for the dynamic linker to call DT_FINI functions for
 101    shared libraries that have been loaded before the code runs.
 102
 103    A value of 0 tells we have no such handler.
 104
 105    We might as well make sure everything else is cleared too (except for %esp),
 106    just to make things more deterministic.
 107  */
 108 #define ELF_PLAT_INIT(_r, load_addr)            \
 109         do {                                    \
 110         _r->bx = 0; _r->cx = 0; _r->dx = 0;     \
 111         _r->si = 0; _r->di = 0; _r->bp = 0;     \
 112         _r->ax = 0;                             \
 113 } while (0)
 114
 115 /*
 116  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 117  * now struct_user_regs, they are different)
 118  */
 119
 120 #define ELF_CORE_COPY_REGS_COMMON(pr_reg, regs) \
 121 do {                                            \
 122         pr_reg[0] = regs->bx;                   \
 123         pr_reg[1] = regs->cx;                   \
 124         pr_reg[2] = regs->dx;                   \
 125         pr_reg[3] = regs->si;                   \
 126         pr_reg[4] = regs->di;                   \
 127         pr_reg[5] = regs->bp;                   \
 128         pr_reg[6] = regs->ax;                   \
 129         pr_reg[7] = regs->ds & 0xffff;          \
 130         pr_reg[8] = regs->es & 0xffff;          \
 131         pr_reg[9] = regs->fs & 0xffff;          \
 132         pr_reg[11] = regs->orig_ax;             \
 133         pr_reg[12] = regs->ip;                  \
 134         pr_reg[13] = regs->cs & 0xffff;         \
 135         pr_reg[14] = regs->flags;               \
 136         pr_reg[15] = regs->sp;                  \
 137         pr_reg[16] = regs->ss & 0xffff;         \
 138 } while (0);
 139
 140 #define ELF_CORE_COPY_REGS(pr_reg, regs)        \
 141 do {                                            \
 142         ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
 143         pr_reg[10] = get_user_gs(regs);         \
 144 } while (0);
 145
 146 #define ELF_CORE_COPY_KERNEL_REGS(pr_reg, regs) \
 147 do {                                            \
 148         ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
 149         savesegment(gs, pr_reg[10]);            \
 150 } while (0);
 151
 152 #define ELF_PLATFORM    (utsname()->machine)
 153 #define set_personality_64bit() do { } while (0)
 154
 155 #else /* CONFIG_X86_32 */
 156
 157 /*
 158  * This is used to ensure we don't load something for the wrong architecture.
 159  */
 160 #define elf_check_arch(x)                       \
 161         ((x)->e_machine == EM_X86_64)
 162
 163 #define compat_elf_check_arch(x)                \
 164         (elf_check_arch_ia32(x) || (x)->e_machine == EM_X86_64)
 165
 166 #if __USER32_DS != __USER_DS
 167 # error "The following code assumes __USER32_DS == __USER_DS"
 168 #endif
 169
 170 static inline void elf_common_init(struct thread_struct *t,
 171                                    struct pt_regs *regs, const u16 ds)
 172 {
 173         regs->ax = regs->bx = regs->cx = regs->dx = 0;
 174         regs->si = regs->di = regs->bp = 0;
 175         regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
 176         regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
 177         t->fs = t->gs = 0;
 178         t->fsindex = t->gsindex = 0;
 179         t->ds = t->es = ds;
 180 }
 181
 182 #define ELF_PLAT_INIT(_r, load_addr)                    \
 183         elf_common_init(&current->thread, _r, 0)
 184
 185 #define COMPAT_ELF_PLAT_INIT(regs, load_addr)           \
 186         elf_common_init(&current->thread, regs, __USER_DS)
 187
 188 void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp);
 189 #define compat_start_thread start_thread_ia32
 190
 191 void set_personality_ia32(bool);
 192 #define COMPAT_SET_PERSONALITY(ex)                      \
 193         set_personality_ia32((ex).e_machine == EM_X86_64)
 194
 195 #define COMPAT_ELF_PLATFORM                     ("i686")
 196
 197 /*
 198  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 199  * now struct_user_regs, they are different). Assumes current is the process
 200  * getting dumped.
 201  */
 202
 203 #define ELF_CORE_COPY_REGS(pr_reg, regs)                        \
 204 do {                                                            \
 205         unsigned v;                                             \
 206         (pr_reg)[0] = (regs)->r15;                              \
 207         (pr_reg)[1] = (regs)->r14;                              \
 208         (pr_reg)[2] = (regs)->r13;                              \
 209         (pr_reg)[3] = (regs)->r12;                              \
 210         (pr_reg)[4] = (regs)->bp;                               \
 211         (pr_reg)[5] = (regs)->bx;                               \
 212         (pr_reg)[6] = (regs)->r11;                              \
 213         (pr_reg)[7] = (regs)->r10;                              \
 214         (pr_reg)[8] = (regs)->r9;                               \
 215         (pr_reg)[9] = (regs)->r8;                               \
 216         (pr_reg)[10] = (regs)->ax;                              \
 217         (pr_reg)[11] = (regs)->cx;                              \
 218         (pr_reg)[12] = (regs)->dx;                              \
 219         (pr_reg)[13] = (regs)->si;                              \
 220         (pr_reg)[14] = (regs)->di;                              \
 221         (pr_reg)[15] = (regs)->orig_ax;                         \
 222         (pr_reg)[16] = (regs)->ip;                              \
 223         (pr_reg)[17] = (regs)->cs;                              \
 224         (pr_reg)[18] = (regs)->flags;                           \
 225         (pr_reg)[19] = (regs)->sp;                              \
 226         (pr_reg)[20] = (regs)->ss;                              \
 227         (pr_reg)[21] = current->thread.fs;                      \
 228         (pr_reg)[22] = current->thread.gs;                      \
 229         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
 230         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
 231         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
 232         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
 233 } while (0);
 234
 235 /* I'm not sure if we can use '-' here */
 236 #define ELF_PLATFORM       ("x86_64")
 237 extern void set_personality_64bit(void);
 238 extern unsigned int sysctl_vsyscall32;
 239 extern int force_personality32;
 240
 241 #endif /* !CONFIG_X86_32 */
 242
 243 #define CORE_DUMP_USE_REGSET
 244 #define ELF_EXEC_PAGESIZE       4096
 245
 246 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 247    use of this is to invoke "./ld.so someprog" to test out a new version of
 248    the loader.  We need to make sure that it is out of the way of the program
 249    that it will "exec", and that there is sufficient room for the brk.  */
 250
 251 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 252
 253 /* This yields a mask that user programs can use to figure out what
 254    instruction set this CPU supports.  This could be done in user space,
 255    but it's not easy, and we've already done it here.  */
 256
 257 #define ELF_HWCAP               (boot_cpu_data.x86_capability[0])
 258
 259 /* This yields a string that ld.so will use to load implementation
 260    specific libraries for optimization.  This is more specific in
 261    intent than poking at uname or /proc/cpuinfo.
 262
 263    For the moment, we have only optimizations for the Intel generations,
 264    but that could change... */
 265
 266 #define SET_PERSONALITY(ex) set_personality_64bit()
 267
 268 /*
 269  * An executable for which elf_read_implies_exec() returns TRUE will
 270  * have the READ_IMPLIES_EXEC personality flag set automatically.
 271  */
 272 #define elf_read_implies_exec(ex, executable_stack)     \
 273         (executable_stack != EXSTACK_DISABLE_X)
 274
 275 struct task_struct;
 276
 277 #define ARCH_DLINFO_IA32                                                \
 278 do {                                                                    \
 279         if (vdso32_enabled) {                                           \
 280                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
 281                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
 282         }                                                               \
 283 } while (0)
 284
 285 #ifdef CONFIG_X86_32
 286
 287 #define STACK_RND_MASK (0x7ff)
 288
 289 #define ARCH_DLINFO             ARCH_DLINFO_IA32
 290
 291 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 292
 293 #else /* CONFIG_X86_32 */
 294
 295 /* 1GB for 64bit, 8MB for 32bit */
 296 #define STACK_RND_MASK (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff)
 297
 298 #define ARCH_DLINFO                                                     \
 299 do {                                                                    \
 300         if (vdso64_enabled)                                             \
 301                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 302                             (unsigned long __force)current->mm->context.vdso); \
 303 } while (0)
 304
 305 /* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */
 306 #define ARCH_DLINFO_X32                                                 \
 307 do {                                                                    \
 308         if (vdso64_enabled)                                             \
 309                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 310                             (unsigned long __force)current->mm->context.vdso); \
 311 } while (0)
 312
 313 #define AT_SYSINFO              32
 314
 315 #define COMPAT_ARCH_DLINFO                                              \
 316 if (test_thread_flag(TIF_X32))                                          \
 317         ARCH_DLINFO_X32;                                                \
 318 else                                                                    \
 319         ARCH_DLINFO_IA32
 320
 321 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
 322
 323 #endif /* !CONFIG_X86_32 */
 324
 325 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
 326
 327 #define VDSO_ENTRY                                                      \
 328         ((unsigned long)current->mm->context.vdso +                     \
 329          selected_vdso32->sym___kernel_vsyscall)
 330
 331 struct linux_binprm;
 332
 333 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 334 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 335                                        int uses_interp);
 336 extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
 337                                               int uses_interp);
 338 #define compat_arch_setup_additional_pages compat_arch_setup_additional_pages
 339
 340 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
 341 #define arch_randomize_brk arch_randomize_brk
 342
 343 /*
 344  * True on X86_32 or when emulating IA32 on X86_64
 345  */
 346 static inline int mmap_is_ia32(void)
 347 {
 348 #ifdef CONFIG_X86_32
 349         return 1;
 350 #endif
 351 #ifdef CONFIG_IA32_EMULATION
 352         if (test_thread_flag(TIF_ADDR32))
 353                 return 1;
 354 #endif
 355         return 0;
 356 }
 357
 358 /* Do not change the values. See get_align_mask() */
 359 enum align_flags {
 360         ALIGN_VA_32     = BIT(0),
 361         ALIGN_VA_64     = BIT(1),
 362 };
 363
 364 struct va_alignment {
 365         int flags;
 366         unsigned long mask;
 367 } ____cacheline_aligned;
 368
 369 extern struct va_alignment va_align;
 370 extern unsigned long align_vdso_addr(unsigned long);
 371 #endif /* _ASM_X86_ELF_H */