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 #include <asm/system.h>
  88
  89 #ifdef CONFIG_X86_32
  90 #include <asm/desc.h>
  91
  92 #define elf_check_arch(x)       elf_check_arch_ia32(x)
  93
  94 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
  95    contains a pointer to a function which might be registered using `atexit'.
  96    This provides a mean for the dynamic linker to call DT_FINI functions for
  97    shared libraries that have been loaded before the code runs.
  98
  99    A value of 0 tells we have no such handler.
 100
 101    We might as well make sure everything else is cleared too (except for %esp),
 102    just to make things more deterministic.
 103  */
 104 #define ELF_PLAT_INIT(_r, load_addr)            \
 105         do {                                    \
 106         _r->bx = 0; _r->cx = 0; _r->dx = 0;     \
 107         _r->si = 0; _r->di = 0; _r->bp = 0;     \
 108         _r->ax = 0;                             \
 109 } while (0)
 110
 111 /*
 112  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 113  * now struct_user_regs, they are different)
 114  */
 115
 116 #define ELF_CORE_COPY_REGS_COMMON(pr_reg, regs) \
 117 do {                                            \
 118         pr_reg[0] = regs->bx;                   \
 119         pr_reg[1] = regs->cx;                   \
 120         pr_reg[2] = regs->dx;                   \
 121         pr_reg[3] = regs->si;                   \
 122         pr_reg[4] = regs->di;                   \
 123         pr_reg[5] = regs->bp;                   \
 124         pr_reg[6] = regs->ax;                   \
 125         pr_reg[7] = regs->ds & 0xffff;          \
 126         pr_reg[8] = regs->es & 0xffff;          \
 127         pr_reg[9] = regs->fs & 0xffff;          \
 128         pr_reg[11] = regs->orig_ax;             \
 129         pr_reg[12] = regs->ip;                  \
 130         pr_reg[13] = regs->cs & 0xffff;         \
 131         pr_reg[14] = regs->flags;               \
 132         pr_reg[15] = regs->sp;                  \
 133         pr_reg[16] = regs->ss & 0xffff;         \
 134 } while (0);
 135
 136 #define ELF_CORE_COPY_REGS(pr_reg, regs)        \
 137 do {                                            \
 138         ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
 139         pr_reg[10] = get_user_gs(regs);         \
 140 } while (0);
 141
 142 #define ELF_CORE_COPY_KERNEL_REGS(pr_reg, regs) \
 143 do {                                            \
 144         ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
 145         savesegment(gs, pr_reg[10]);            \
 146 } while (0);
 147
 148 #define ELF_PLATFORM    (utsname()->machine)
 149 #define set_personality_64bit() do { } while (0)
 150
 151 #else /* CONFIG_X86_32 */
 152
 153 /*
 154  * This is used to ensure we don't load something for the wrong architecture.
 155  */
 156 #define elf_check_arch(x)                       \
 157         ((x)->e_machine == EM_X86_64)
 158
 159 #define compat_elf_check_arch(x)        elf_check_arch_ia32(x)
 160
 161 static inline void elf_common_init(struct thread_struct *t,
 162                                    struct pt_regs *regs, const u16 ds)
 163 {
 164         regs->ax = regs->bx = regs->cx = regs->dx = 0;
 165         regs->si = regs->di = regs->bp = 0;
 166         regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
 167         regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
 168         t->fs = t->gs = 0;
 169         t->fsindex = t->gsindex = 0;
 170         t->ds = t->es = ds;
 171 }
 172
 173 #define ELF_PLAT_INIT(_r, load_addr)                    \
 174         elf_common_init(&current->thread, _r, 0)
 175
 176 #define COMPAT_ELF_PLAT_INIT(regs, load_addr)           \
 177         elf_common_init(&current->thread, regs, __USER_DS)
 178
 179 void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp);
 180 #define compat_start_thread start_thread_ia32
 181
 182 void set_personality_ia32(void);
 183 #define COMPAT_SET_PERSONALITY(ex) set_personality_ia32()
 184
 185 #define COMPAT_ELF_PLATFORM                     ("i686")
 186
 187 /*
 188  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 189  * now struct_user_regs, they are different). Assumes current is the process
 190  * getting dumped.
 191  */
 192
 193 #define ELF_CORE_COPY_REGS(pr_reg, regs)                        \
 194 do {                                                            \
 195         unsigned v;                                             \
 196         (pr_reg)[0] = (regs)->r15;                              \
 197         (pr_reg)[1] = (regs)->r14;                              \
 198         (pr_reg)[2] = (regs)->r13;                              \
 199         (pr_reg)[3] = (regs)->r12;                              \
 200         (pr_reg)[4] = (regs)->bp;                               \
 201         (pr_reg)[5] = (regs)->bx;                               \
 202         (pr_reg)[6] = (regs)->r11;                              \
 203         (pr_reg)[7] = (regs)->r10;                              \
 204         (pr_reg)[8] = (regs)->r9;                               \
 205         (pr_reg)[9] = (regs)->r8;                               \
 206         (pr_reg)[10] = (regs)->ax;                              \
 207         (pr_reg)[11] = (regs)->cx;                              \
 208         (pr_reg)[12] = (regs)->dx;                              \
 209         (pr_reg)[13] = (regs)->si;                              \
 210         (pr_reg)[14] = (regs)->di;                              \
 211         (pr_reg)[15] = (regs)->orig_ax;                         \
 212         (pr_reg)[16] = (regs)->ip;                              \
 213         (pr_reg)[17] = (regs)->cs;                              \
 214         (pr_reg)[18] = (regs)->flags;                           \
 215         (pr_reg)[19] = (regs)->sp;                              \
 216         (pr_reg)[20] = (regs)->ss;                              \
 217         (pr_reg)[21] = current->thread.fs;                      \
 218         (pr_reg)[22] = current->thread.gs;                      \
 219         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
 220         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
 221         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
 222         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
 223 } while (0);
 224
 225 /* I'm not sure if we can use '-' here */
 226 #define ELF_PLATFORM       ("x86_64")
 227 extern void set_personality_64bit(void);
 228 extern unsigned int sysctl_vsyscall32;
 229 extern int force_personality32;
 230
 231 #endif /* !CONFIG_X86_32 */
 232
 233 #define CORE_DUMP_USE_REGSET
 234 #define ELF_EXEC_PAGESIZE       4096
 235
 236 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 237    use of this is to invoke "./ld.so someprog" to test out a new version of
 238    the loader.  We need to make sure that it is out of the way of the program
 239    that it will "exec", and that there is sufficient room for the brk.  */
 240
 241 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 242
 243 /* This yields a mask that user programs can use to figure out what
 244    instruction set this CPU supports.  This could be done in user space,
 245    but it's not easy, and we've already done it here.  */
 246
 247 #define ELF_HWCAP               (boot_cpu_data.x86_capability[0])
 248
 249 /* This yields a string that ld.so will use to load implementation
 250    specific libraries for optimization.  This is more specific in
 251    intent than poking at uname or /proc/cpuinfo.
 252
 253    For the moment, we have only optimizations for the Intel generations,
 254    but that could change... */
 255
 256 #define SET_PERSONALITY(ex) set_personality_64bit()
 257
 258 /*
 259  * An executable for which elf_read_implies_exec() returns TRUE will
 260  * have the READ_IMPLIES_EXEC personality flag set automatically.
 261  */
 262 #define elf_read_implies_exec(ex, executable_stack)     \
 263         (executable_stack != EXSTACK_DISABLE_X)
 264
 265 struct task_struct;
 266
 267 #define ARCH_DLINFO_IA32(vdso_enabled)                                  \
 268 do {                                                                    \
 269         if (vdso_enabled) {                                             \
 270                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
 271                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
 272         }                                                               \
 273 } while (0)
 274
 275 #ifdef CONFIG_X86_32
 276
 277 #define STACK_RND_MASK (0x7ff)
 278
 279 #define VDSO_HIGH_BASE          (__fix_to_virt(FIX_VDSO))
 280
 281 #define ARCH_DLINFO             ARCH_DLINFO_IA32(vdso_enabled)
 282
 283 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 284
 285 #else /* CONFIG_X86_32 */
 286
 287 #define VDSO_HIGH_BASE          0xffffe000U /* CONFIG_COMPAT_VDSO address */
 288
 289 /* 1GB for 64bit, 8MB for 32bit */
 290 #define STACK_RND_MASK (test_thread_flag(TIF_IA32) ? 0x7ff : 0x3fffff)
 291
 292 #define ARCH_DLINFO                                                     \
 293 do {                                                                    \
 294         if (vdso_enabled)                                               \
 295                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 296                             (unsigned long)current->mm->context.vdso);  \
 297 } while (0)
 298
 299 #define AT_SYSINFO              32
 300
 301 #define COMPAT_ARCH_DLINFO      ARCH_DLINFO_IA32(sysctl_vsyscall32)
 302
 303 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
 304
 305 #endif /* !CONFIG_X86_32 */
 306
 307 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
 308
 309 #define VDSO_ENTRY                                                      \
 310         ((unsigned long)VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall))
 311
 312 struct linux_binprm;
 313
 314 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 315 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 316                                        int uses_interp);
 317
 318 extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
 319 #define compat_arch_setup_additional_pages      syscall32_setup_pages
 320
 321 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
 322 #define arch_randomize_brk arch_randomize_brk
 323
 324 /*
 325  * True on X86_32 or when emulating IA32 on X86_64
 326  */
 327 static inline int mmap_is_ia32(void)
 328 {
 329 #ifdef CONFIG_X86_32
 330         return 1;
 331 #endif
 332 #ifdef CONFIG_IA32_EMULATION
 333         if (test_thread_flag(TIF_IA32))
 334                 return 1;
 335 #endif
 336         return 0;
 337 }
 338
 339 /* The first two values are special, do not change. See align_addr() */
 340 enum align_flags {
 341         ALIGN_VA_32     = BIT(0),
 342         ALIGN_VA_64     = BIT(1),
 343         ALIGN_VDSO      = BIT(2),
 344         ALIGN_TOPDOWN   = BIT(3),
 345 };
 346
 347 struct va_alignment {
 348         int flags;
 349         unsigned long mask;
 350 } ____cacheline_aligned;
 351
 352 extern struct va_alignment va_align;
 353 extern unsigned long align_addr(unsigned long, struct file *, enum align_flags);
 354 #endif /* _ASM_X86_ELF_H */