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 long base;                                     \
 208         unsigned v;                                             \
 209         (pr_reg)[0] = (regs)->r15;                              \
 210         (pr_reg)[1] = (regs)->r14;                              \
 211         (pr_reg)[2] = (regs)->r13;                              \
 212         (pr_reg)[3] = (regs)->r12;                              \
 213         (pr_reg)[4] = (regs)->bp;                               \
 214         (pr_reg)[5] = (regs)->bx;                               \
 215         (pr_reg)[6] = (regs)->r11;                              \
 216         (pr_reg)[7] = (regs)->r10;                              \
 217         (pr_reg)[8] = (regs)->r9;                               \
 218         (pr_reg)[9] = (regs)->r8;                               \
 219         (pr_reg)[10] = (regs)->ax;                              \
 220         (pr_reg)[11] = (regs)->cx;                              \
 221         (pr_reg)[12] = (regs)->dx;                              \
 222         (pr_reg)[13] = (regs)->si;                              \
 223         (pr_reg)[14] = (regs)->di;                              \
 224         (pr_reg)[15] = (regs)->orig_ax;                         \
 225         (pr_reg)[16] = (regs)->ip;                              \
 226         (pr_reg)[17] = (regs)->cs;                              \
 227         (pr_reg)[18] = (regs)->flags;                           \
 228         (pr_reg)[19] = (regs)->sp;                              \
 229         (pr_reg)[20] = (regs)->ss;                              \
 230         rdmsrl(MSR_FS_BASE, base); (pr_reg)[21] = base;         \
 231         rdmsrl(MSR_KERNEL_GS_BASE, base); (pr_reg)[22] = base;  \
 232         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
 233         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
 234         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
 235         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
 236 } while (0);
 237
 238 /* I'm not sure if we can use '-' here */
 239 #define ELF_PLATFORM       ("x86_64")
 240 extern void set_personality_64bit(void);
 241 extern unsigned int sysctl_vsyscall32;
 242 extern int force_personality32;
 243
 244 #endif /* !CONFIG_X86_32 */
 245
 246 #define CORE_DUMP_USE_REGSET
 247 #define ELF_EXEC_PAGESIZE       4096
 248
 249 /*
 250  * This is the base location for PIE (ET_DYN with INTERP) loads. On
 251  * 64-bit, this is above 4GB to leave the entire 32-bit address
 252  * space open for things that want to use the area for 32-bit pointers.
 253  */
 254 #define ELF_ET_DYN_BASE         (mmap_is_ia32() ? 0x000400000UL : \
 255                                                   (TASK_SIZE / 3 * 2))
 256
 257 /* This yields a mask that user programs can use to figure out what
 258    instruction set this CPU supports.  This could be done in user space,
 259    but it's not easy, and we've already done it here.  */
 260
 261 #define ELF_HWCAP               (boot_cpu_data.x86_capability[CPUID_1_EDX])
 262
 263 /* This yields a string that ld.so will use to load implementation
 264    specific libraries for optimization.  This is more specific in
 265    intent than poking at uname or /proc/cpuinfo.
 266
 267    For the moment, we have only optimizations for the Intel generations,
 268    but that could change... */
 269
 270 #define SET_PERSONALITY(ex) set_personality_64bit()
 271
 272 /*
 273  * An executable for which elf_read_implies_exec() returns TRUE will
 274  * have the READ_IMPLIES_EXEC personality flag set automatically.
 275  */
 276 #define elf_read_implies_exec(ex, executable_stack)     \
 277         (executable_stack != EXSTACK_DISABLE_X)
 278
 279 struct task_struct;
 280
 281 #define ARCH_DLINFO_IA32                                                \
 282 do {                                                                    \
 283         if (VDSO_CURRENT_BASE) {                                        \
 284                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
 285                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
 286         }                                                               \
 287 } while (0)
 288
 289 #ifdef CONFIG_X86_32
 290
 291 #define STACK_RND_MASK (0x7ff)
 292
 293 #define ARCH_DLINFO             ARCH_DLINFO_IA32
 294
 295 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 296
 297 #else /* CONFIG_X86_32 */
 298
 299 /* 1GB for 64bit, 8MB for 32bit */
 300 #define STACK_RND_MASK (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff)
 301
 302 #define ARCH_DLINFO                                                     \
 303 do {                                                                    \
 304         if (vdso64_enabled)                                             \
 305                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 306                             (unsigned long __force)current->mm->context.vdso); \
 307 } while (0)
 308
 309 /* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */
 310 #define ARCH_DLINFO_X32                                                 \
 311 do {                                                                    \
 312         if (vdso64_enabled)                                             \
 313                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
 314                             (unsigned long __force)current->mm->context.vdso); \
 315 } while (0)
 316
 317 #define AT_SYSINFO              32
 318
 319 #define COMPAT_ARCH_DLINFO                                              \
 320 if (test_thread_flag(TIF_X32))                                          \
 321         ARCH_DLINFO_X32;                                                \
 322 else                                                                    \
 323         ARCH_DLINFO_IA32
 324
 325 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
 326
 327 #endif /* !CONFIG_X86_32 */
 328
 329 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
 330
 331 #define VDSO_ENTRY                                                      \
 332         ((unsigned long)current->mm->context.vdso +                     \
 333          vdso_image_32.sym___kernel_vsyscall)
 334
 335 struct linux_binprm;
 336
 337 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 338 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 339                                        int uses_interp);
 340 extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
 341                                               int uses_interp);
 342 #define compat_arch_setup_additional_pages compat_arch_setup_additional_pages
 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         return IS_ENABLED(CONFIG_X86_32) ||
 350                (IS_ENABLED(CONFIG_COMPAT) &&
 351                 test_thread_flag(TIF_ADDR32));
 352 }
 353
 354 /* Do not change the values. See get_align_mask() */
 355 enum align_flags {
 356         ALIGN_VA_32     = BIT(0),
 357         ALIGN_VA_64     = BIT(1),
 358 };
 359
 360 struct va_alignment {
 361         int flags;
 362         unsigned long mask;
 363         unsigned long bits;
 364 } ____cacheline_aligned;
 365
 366 extern struct va_alignment va_align;
 367 extern unsigned long align_vdso_addr(unsigned long);
 368 #endif /* _ASM_X86_ELF_H */