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 extern unsigned int vdso_enabled;
  79
  80 /*
  81  * This is used to ensure we don't load something for the wrong architecture.
  82  */
  83 #define elf_check_arch_ia32(x) \
  84         (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
  85
  86 #include <asm/processor.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)                                        \
 159         (elf_check_arch_ia32(x) ||                                      \
 160          (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64))
 161
 162 #if __USER32_DS != __USER_DS
 163 # error "The following code assumes __USER32_DS == __USER_DS"
 164 #endif
 165
 166 static inline void elf_common_init(struct thread_struct *t,
 167                                    struct pt_regs *regs, const u16 ds)
 168 {
 169         regs->ax = regs->bx = regs->cx = regs->dx = 0;
 170         regs->si = regs->di = regs->bp = 0;
 171         regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
 172         regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
 173         t->fs = t->gs = 0;
 174         t->fsindex = t->gsindex = 0;
 175         t->ds = t->es = ds;
 176 }
 177
 178 #define ELF_PLAT_INIT(_r, load_addr)                    \
 179         elf_common_init(&current->thread, _r, 0)
 180
 181 #define COMPAT_ELF_PLAT_INIT(regs, load_addr)           \
 182         elf_common_init(&current->thread, regs, __USER_DS)
 183
 184 void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp);
 185 #define compat_start_thread start_thread_ia32
 186
 187 void set_personality_ia32(bool);
 188 #define COMPAT_SET_PERSONALITY(ex)                      \
 189         set_personality_ia32((ex).e_machine == EM_X86_64)
 190
 191 #define COMPAT_ELF_PLATFORM                     ("i686")
 192
 193 /*
 194  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 195  * now struct_user_regs, they are different). Assumes current is the process
 196  * getting dumped.
 197  */
 198
 199 #define ELF_CORE_COPY_REGS(pr_reg, regs)                        \
 200 do {                                                            \
 201         unsigned v;                                             \
 202         (pr_reg)[0] = (regs)->r15;                              \
 203         (pr_reg)[1] = (regs)->r14;                              \
 204         (pr_reg)[2] = (regs)->r13;                              \
 205         (pr_reg)[3] = (regs)->r12;                              \
 206         (pr_reg)[4] = (regs)->bp;                               \
 207         (pr_reg)[5] = (regs)->bx;                               \
 208         (pr_reg)[6] = (regs)->r11;                              \
 209         (pr_reg)[7] = (regs)->r10;                              \
 210         (pr_reg)[8] = (regs)->r9;                               \
 211         (pr_reg)[9] = (regs)->r8;                               \
 212         (pr_reg)[10] = (regs)->ax;                              \
 213         (pr_reg)[11] = (regs)->cx;                              \
 214         (pr_reg)[12] = (regs)->dx;                              \
 215         (pr_reg)[13] = (regs)->si;                              \
 216         (pr_reg)[14] = (regs)->di;                              \
 217         (pr_reg)[15] = (regs)->orig_ax;                         \
 218         (pr_reg)[16] = (regs)->ip;                              \
 219         (pr_reg)[17] = (regs)->cs;                              \
 220         (pr_reg)[18] = (regs)->flags;                           \
 221         (pr_reg)[19] = (regs)->sp;                              \
 222         (pr_reg)[20] = (regs)->ss;                              \
 223         (pr_reg)[21] = current->thread.fs;                      \
 224         (pr_reg)[22] = current->thread.gs;                      \
 225         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
 226         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
 227         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
 228         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
 229 } while (0);
 230
 231 /* I'm not sure if we can use '-' here */
 232 #define ELF_PLATFORM       ("x86_64")
 233 extern void set_personality_64bit(void);
 234 extern unsigned int sysctl_vsyscall32;
 235 extern int force_personality32;
 236
 237 #endif /* !CONFIG_X86_32 */
 238
 239 #define CORE_DUMP_USE_REGSET
 240 #define ELF_EXEC_PAGESIZE       4096
 241
 242 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 243    use of this is to invoke "./ld.so someprog" to test out a new version of
 244    the loader.  We need to make sure that it is out of the way of the program
 245    that it will "exec", and that there is sufficient room for the brk.  */
 246
 247 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 248
 249 /* This yields a mask that user programs can use to figure out what
 250    instruction set this CPU supports.  This could be done in user space,
 251    but it's not easy, and we've already done it here.  */
 252
 253 #define ELF_HWCAP               (boot_cpu_data.x86_capability[0])
 254
 255 /* This yields a string that ld.so will use to load implementation
 256    specific libraries for optimization.  This is more specific in
 257    intent than poking at uname or /proc/cpuinfo.
 258
 259    For the moment, we have only optimizations for the Intel generations,
 260    but that could change... */
 261
 262 #define SET_PERSONALITY(ex) set_personality_64bit()
 263
 264 /*
 265  * An executable for which elf_read_implies_exec() returns TRUE will
 266  * have the READ_IMPLIES_EXEC personality flag set automatically.
 267  */
 268 #define elf_read_implies_exec(ex, executable_stack)     \
 269         (executable_stack != EXSTACK_DISABLE_X)
 270
 271 struct task_struct;
 272
 273 #define ARCH_DLINFO_IA32(vdso_enabled)                                  \
 274 do {                                                                    \
 275         if (VDSO_CURRENT_BASE) {                                        \
 276                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
 277                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
 278         }                                                               \
 279 } while (0)
 280
 281 #ifdef CONFIG_X86_32
 282
 283 #define STACK_RND_MASK (0x7ff)
 284
 285 #define VDSO_HIGH_BASE          (__fix_to_virt(FIX_VDSO))
 286
 287 #define ARCH_DLINFO             ARCH_DLINFO_IA32(vdso_enabled)
 288
 289 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 290
 291 #else /* CONFIG_X86_32 */
 292
 293 #define VDSO_HIGH_BASE          0xffffe000U /* CONFIG_COMPAT_VDSO address */
 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 (vdso_enabled)                                               \
 301                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 302                             (unsigned long)current->mm->context.vdso);  \
 303 } while (0)
 304
 305 #define ARCH_DLINFO_X32                                                 \
 306 do {                                                                    \
 307         if (vdso_enabled)                                               \
 308                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 309                             (unsigned long)current->mm->context.vdso);  \
 310 } while (0)
 311
 312 #define AT_SYSINFO              32
 313
 314 #define COMPAT_ARCH_DLINFO                                              \
 315 if (test_thread_flag(TIF_X32))                                          \
 316         ARCH_DLINFO_X32;                                                \
 317 else                                                                    \
 318         ARCH_DLINFO_IA32(sysctl_vsyscall32)
 319
 320 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
 321
 322 #endif /* !CONFIG_X86_32 */
 323
 324 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
 325
 326 #define VDSO_ENTRY                                                      \
 327         ((unsigned long)VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall))
 328
 329 struct linux_binprm;
 330
 331 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 332 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 333                                        int uses_interp);
 334 extern int x32_setup_additional_pages(struct linux_binprm *bprm,
 335                                       int uses_interp);
 336
 337 extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
 338 #define compat_arch_setup_additional_pages      syscall32_setup_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 */