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_IA32_EMULATION)
  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         /* ax gets execve's return value. */
 175         /*regs->ax = */ regs->bx = regs->cx = regs->dx = 0;
 176         regs->si = regs->di = regs->bp = 0;
 177         regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
 178         regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
 179         t->fsbase = t->gsbase = 0;
 180         t->fsindex = t->gsindex = 0;
 181         t->ds = t->es = ds;
 182 }
 183
 184 #define ELF_PLAT_INIT(_r, load_addr)                    \
 185         elf_common_init(&current->thread, _r, 0)
 186
 187 #define COMPAT_ELF_PLAT_INIT(regs, load_addr)           \
 188         elf_common_init(&current->thread, regs, __USER_DS)
 189
 190 void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp);
 191 #define compat_start_thread compat_start_thread
 192
 193 void set_personality_ia32(bool);
 194 #define COMPAT_SET_PERSONALITY(ex)                      \
 195         set_personality_ia32((ex).e_machine == EM_X86_64)
 196
 197 #define COMPAT_ELF_PLATFORM                     ("i686")
 198
 199 /*
 200  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 201  * now struct_user_regs, they are different). Assumes current is the process
 202  * getting dumped.
 203  */
 204
 205 #define ELF_CORE_COPY_REGS(pr_reg, regs)                        \
 206 do {                                                            \
 207         unsigned v;                                             \
 208         (pr_reg)[0] = (regs)->r15;                              \
 209         (pr_reg)[1] = (regs)->r14;                              \
 210         (pr_reg)[2] = (regs)->r13;                              \
 211         (pr_reg)[3] = (regs)->r12;                              \
 212         (pr_reg)[4] = (regs)->bp;                               \
 213         (pr_reg)[5] = (regs)->bx;                               \
 214         (pr_reg)[6] = (regs)->r11;                              \
 215         (pr_reg)[7] = (regs)->r10;                              \
 216         (pr_reg)[8] = (regs)->r9;                               \
 217         (pr_reg)[9] = (regs)->r8;                               \
 218         (pr_reg)[10] = (regs)->ax;                              \
 219         (pr_reg)[11] = (regs)->cx;                              \
 220         (pr_reg)[12] = (regs)->dx;                              \
 221         (pr_reg)[13] = (regs)->si;                              \
 222         (pr_reg)[14] = (regs)->di;                              \
 223         (pr_reg)[15] = (regs)->orig_ax;                         \
 224         (pr_reg)[16] = (regs)->ip;                              \
 225         (pr_reg)[17] = (regs)->cs;                              \
 226         (pr_reg)[18] = (regs)->flags;                           \
 227         (pr_reg)[19] = (regs)->sp;                              \
 228         (pr_reg)[20] = (regs)->ss;                              \
 229         (pr_reg)[21] = current->thread.fsbase;                  \
 230         (pr_reg)[22] = current->thread.gsbase;                  \
 231         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
 232         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
 233         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
 234         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
 235 } while (0);
 236
 237 /* I'm not sure if we can use '-' here */
 238 #define ELF_PLATFORM       ("x86_64")
 239 extern void set_personality_64bit(void);
 240 extern unsigned int sysctl_vsyscall32;
 241 extern int force_personality32;
 242
 243 #endif /* !CONFIG_X86_32 */
 244
 245 #define CORE_DUMP_USE_REGSET
 246 #define ELF_EXEC_PAGESIZE       4096
 247
 248 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 249    use of this is to invoke "./ld.so someprog" to test out a new version of
 250    the loader.  We need to make sure that it is out of the way of the program
 251    that it will "exec", and that there is sufficient room for the brk.  */
 252
 253 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 254
 255 /* This yields a mask that user programs can use to figure out what
 256    instruction set this CPU supports.  This could be done in user space,
 257    but it's not easy, and we've already done it here.  */
 258
 259 #define ELF_HWCAP               (boot_cpu_data.x86_capability[CPUID_1_EDX])
 260
 261 extern u32 elf_hwcap2;
 262
 263 /*
 264  * HWCAP2 supplies mask with kernel enabled CPU features, so that
 265  * the application can discover that it can safely use them.
 266  * The bits are defined in uapi/asm/hwcap2.h.
 267  */
 268 #define ELF_HWCAP2              (elf_hwcap2)
 269
 270 /* This yields a string that ld.so will use to load implementation
 271    specific libraries for optimization.  This is more specific in
 272    intent than poking at uname or /proc/cpuinfo.
 273
 274    For the moment, we have only optimizations for the Intel generations,
 275    but that could change... */
 276
 277 #define SET_PERSONALITY(ex) set_personality_64bit()
 278
 279 /*
 280  * An executable for which elf_read_implies_exec() returns TRUE will
 281  * have the READ_IMPLIES_EXEC personality flag set automatically.
 282  */
 283 #define elf_read_implies_exec(ex, executable_stack)     \
 284         (executable_stack != EXSTACK_DISABLE_X)
 285
 286 struct task_struct;
 287
 288 #define ARCH_DLINFO_IA32                                                \
 289 do {                                                                    \
 290         if (VDSO_CURRENT_BASE) {                                        \
 291                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
 292                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
 293         }                                                               \
 294 } while (0)
 295
 296 #ifdef CONFIG_X86_32
 297
 298 #define STACK_RND_MASK (0x7ff)
 299
 300 #define ARCH_DLINFO             ARCH_DLINFO_IA32
 301
 302 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 303
 304 #else /* CONFIG_X86_32 */
 305
 306 /* 1GB for 64bit, 8MB for 32bit */
 307 #define STACK_RND_MASK (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff)
 308
 309 #define ARCH_DLINFO                                                     \
 310 do {                                                                    \
 311         if (vdso64_enabled)                                             \
 312                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 313                             (unsigned long __force)current->mm->context.vdso); \
 314 } while (0)
 315
 316 /* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */
 317 #define ARCH_DLINFO_X32                                                 \
 318 do {                                                                    \
 319         if (vdso64_enabled)                                             \
 320                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 321                             (unsigned long __force)current->mm->context.vdso); \
 322 } while (0)
 323
 324 #define AT_SYSINFO              32
 325
 326 #define COMPAT_ARCH_DLINFO                                              \
 327 if (test_thread_flag(TIF_X32))                                          \
 328         ARCH_DLINFO_X32;                                                \
 329 else                                                                    \
 330         ARCH_DLINFO_IA32
 331
 332 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
 333
 334 #endif /* !CONFIG_X86_32 */
 335
 336 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
 337
 338 #define VDSO_ENTRY                                                      \
 339         ((unsigned long)current->mm->context.vdso +                     \
 340          vdso_image_32.sym___kernel_vsyscall)
 341
 342 struct linux_binprm;
 343
 344 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 345 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 346                                        int uses_interp);
 347 extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
 348                                               int uses_interp);
 349 #define compat_arch_setup_additional_pages compat_arch_setup_additional_pages
 350
 351 /*
 352  * True on X86_32 or when emulating IA32 on X86_64
 353  */
 354 static inline int mmap_is_ia32(void)
 355 {
 356         return IS_ENABLED(CONFIG_X86_32) ||
 357                (IS_ENABLED(CONFIG_COMPAT) &&
 358                 test_thread_flag(TIF_ADDR32));
 359 }
 360
 361 /* Do not change the values. See get_align_mask() */
 362 enum align_flags {
 363         ALIGN_VA_32     = BIT(0),
 364         ALIGN_VA_64     = BIT(1),
 365 };
 366
 367 struct va_alignment {
 368         int flags;
 369         unsigned long mask;
 370         unsigned long bits;
 371 } ____cacheline_aligned;
 372
 373 extern struct va_alignment va_align;
 374 extern unsigned long align_vdso_addr(unsigned long);
 375 #endif /* _ASM_X86_ELF_H */