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) ||                                      \
 165          (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64))
 166
 167 #if __USER32_DS != __USER_DS
 168 # error "The following code assumes __USER32_DS == __USER_DS"
 169 #endif
 170
 171 static inline void elf_common_init(struct thread_struct *t,
 172                                    struct pt_regs *regs, const u16 ds)
 173 {
 174         regs->ax = regs->bx = regs->cx = regs->dx = 0;
 175         regs->si = regs->di = regs->bp = 0;
 176         regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
 177         regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
 178         t->fs = t->gs = 0;
 179         t->fsindex = t->gsindex = 0;
 180         t->ds = t->es = ds;
 181 }
 182
 183 #define ELF_PLAT_INIT(_r, load_addr)                    \
 184         elf_common_init(&current->thread, _r, 0)
 185
 186 #define COMPAT_ELF_PLAT_INIT(regs, load_addr)           \
 187         elf_common_init(&current->thread, regs, __USER_DS)
 188
 189 void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp);
 190 #define compat_start_thread start_thread_ia32
 191
 192 void set_personality_ia32(bool);
 193 #define COMPAT_SET_PERSONALITY(ex)                      \
 194         set_personality_ia32((ex).e_machine == EM_X86_64)
 195
 196 #define COMPAT_ELF_PLATFORM                     ("i686")
 197
 198 /*
 199  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 200  * now struct_user_regs, they are different). Assumes current is the process
 201  * getting dumped.
 202  */
 203
 204 #define ELF_CORE_COPY_REGS(pr_reg, regs)                        \
 205 do {                                                            \
 206         unsigned v;                                             \
 207         (pr_reg)[0] = (regs)->r15;                              \
 208         (pr_reg)[1] = (regs)->r14;                              \
 209         (pr_reg)[2] = (regs)->r13;                              \
 210         (pr_reg)[3] = (regs)->r12;                              \
 211         (pr_reg)[4] = (regs)->bp;                               \
 212         (pr_reg)[5] = (regs)->bx;                               \
 213         (pr_reg)[6] = (regs)->r11;                              \
 214         (pr_reg)[7] = (regs)->r10;                              \
 215         (pr_reg)[8] = (regs)->r9;                               \
 216         (pr_reg)[9] = (regs)->r8;                               \
 217         (pr_reg)[10] = (regs)->ax;                              \
 218         (pr_reg)[11] = (regs)->cx;                              \
 219         (pr_reg)[12] = (regs)->dx;                              \
 220         (pr_reg)[13] = (regs)->si;                              \
 221         (pr_reg)[14] = (regs)->di;                              \
 222         (pr_reg)[15] = (regs)->orig_ax;                         \
 223         (pr_reg)[16] = (regs)->ip;                              \
 224         (pr_reg)[17] = (regs)->cs;                              \
 225         (pr_reg)[18] = (regs)->flags;                           \
 226         (pr_reg)[19] = (regs)->sp;                              \
 227         (pr_reg)[20] = (regs)->ss;                              \
 228         (pr_reg)[21] = current->thread.fs;                      \
 229         (pr_reg)[22] = current->thread.gs;                      \
 230         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
 231         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
 232         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
 233         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
 234 } while (0);
 235
 236 /* I'm not sure if we can use '-' here */
 237 #define ELF_PLATFORM       ("x86_64")
 238 extern void set_personality_64bit(void);
 239 extern unsigned int sysctl_vsyscall32;
 240 extern int force_personality32;
 241
 242 #endif /* !CONFIG_X86_32 */
 243
 244 #define CORE_DUMP_USE_REGSET
 245 #define ELF_EXEC_PAGESIZE       4096
 246
 247 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 248    use of this is to invoke "./ld.so someprog" to test out a new version of
 249    the loader.  We need to make sure that it is out of the way of the program
 250    that it will "exec", and that there is sufficient room for the brk.  */
 251
 252 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 253
 254 /* This yields a mask that user programs can use to figure out what
 255    instruction set this CPU supports.  This could be done in user space,
 256    but it's not easy, and we've already done it here.  */
 257
 258 #define ELF_HWCAP               (boot_cpu_data.x86_capability[0])
 259
 260 /* This yields a string that ld.so will use to load implementation
 261    specific libraries for optimization.  This is more specific in
 262    intent than poking at uname or /proc/cpuinfo.
 263
 264    For the moment, we have only optimizations for the Intel generations,
 265    but that could change... */
 266
 267 #define SET_PERSONALITY(ex) set_personality_64bit()
 268
 269 /*
 270  * An executable for which elf_read_implies_exec() returns TRUE will
 271  * have the READ_IMPLIES_EXEC personality flag set automatically.
 272  */
 273 #define elf_read_implies_exec(ex, executable_stack)     \
 274         (executable_stack != EXSTACK_DISABLE_X)
 275
 276 struct task_struct;
 277
 278 #define ARCH_DLINFO_IA32                                                \
 279 do {                                                                    \
 280         if (vdso32_enabled) {                                           \
 281                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
 282                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
 283         }                                                               \
 284 } while (0)
 285
 286 #ifdef CONFIG_X86_32
 287
 288 #define STACK_RND_MASK (0x7ff)
 289
 290 #define ARCH_DLINFO             ARCH_DLINFO_IA32
 291
 292 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 293
 294 #else /* CONFIG_X86_32 */
 295
 296 /* 1GB for 64bit, 8MB for 32bit */
 297 #define STACK_RND_MASK (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff)
 298
 299 #define ARCH_DLINFO                                                     \
 300 do {                                                                    \
 301         if (vdso64_enabled)                                             \
 302                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 303                             (unsigned long __force)current->mm->context.vdso); \
 304 } while (0)
 305
 306 /* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */
 307 #define ARCH_DLINFO_X32                                                 \
 308 do {                                                                    \
 309         if (vdso64_enabled)                                             \
 310                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 311                             (unsigned long __force)current->mm->context.vdso); \
 312 } while (0)
 313
 314 #define AT_SYSINFO              32
 315
 316 #define COMPAT_ARCH_DLINFO                                              \
 317 if (test_thread_flag(TIF_X32))                                          \
 318         ARCH_DLINFO_X32;                                                \
 319 else                                                                    \
 320         ARCH_DLINFO_IA32
 321
 322 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
 323
 324 #endif /* !CONFIG_X86_32 */
 325
 326 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
 327
 328 #define VDSO_ENTRY                                                      \
 329         ((unsigned long)current->mm->context.vdso +                     \
 330          selected_vdso32->sym___kernel_vsyscall)
 331
 332 struct linux_binprm;
 333
 334 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 335 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 336                                        int uses_interp);
 337 extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
 338                                               int uses_interp);
 339 #define compat_arch_setup_additional_pages compat_arch_setup_additional_pages
 340
 341 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
 342 #define arch_randomize_brk arch_randomize_brk
 343
 344 /*
 345  * True on X86_32 or when emulating IA32 on X86_64
 346  */
 347 static inline int mmap_is_ia32(void)
 348 {
 349 #ifdef CONFIG_X86_32
 350         return 1;
 351 #endif
 352 #ifdef CONFIG_IA32_EMULATION
 353         if (test_thread_flag(TIF_ADDR32))
 354                 return 1;
 355 #endif
 356         return 0;
 357 }
 358
 359 /* Do not change the values. See get_align_mask() */
 360 enum align_flags {
 361         ALIGN_VA_32     = BIT(0),
 362         ALIGN_VA_64     = BIT(1),
 363 };
 364
 365 struct va_alignment {
 366         int flags;
 367         unsigned long mask;
 368         unsigned long bits;
 369 } ____cacheline_aligned;
 370
 371 extern struct va_alignment va_align;
 372 extern unsigned long align_vdso_addr(unsigned long);
 373 #endif /* _ASM_X86_ELF_H */