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) || (x)->e_machine == EM_X86_64) 160 161 #if __USER32_DS != __USER_DS 162 # error "The following code assumes __USER32_DS == __USER_DS" 163 #endif 164 165 static inline void elf_common_init(struct thread_struct *t, 166 struct pt_regs *regs, const u16 ds) 167 { 168 regs->ax = regs->bx = regs->cx = regs->dx = 0; 169 regs->si = regs->di = regs->bp = 0; 170 regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0; 171 regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0; 172 t->fs = t->gs = 0; 173 t->fsindex = t->gsindex = 0; 174 t->ds = t->es = ds; 175 } 176 177 #define ELF_PLAT_INIT(_r, load_addr) \ 178 elf_common_init(¤t->thread, _r, 0) 179 180 #define COMPAT_ELF_PLAT_INIT(regs, load_addr) \ 181 elf_common_init(¤t->thread, regs, __USER_DS) 182 183 void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp); 184 #define compat_start_thread start_thread_ia32 185 186 void set_personality_ia32(bool); 187 #define COMPAT_SET_PERSONALITY(ex) \ 188 set_personality_ia32((ex).e_machine == EM_X86_64) 189 190 #define COMPAT_ELF_PLATFORM ("i686") 191 192 /* 193 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is 194 * now struct_user_regs, they are different). Assumes current is the process 195 * getting dumped. 196 */ 197 198 #define ELF_CORE_COPY_REGS(pr_reg, regs) \ 199 do { \ 200 unsigned v; \ 201 (pr_reg)[0] = (regs)->r15; \ 202 (pr_reg)[1] = (regs)->r14; \ 203 (pr_reg)[2] = (regs)->r13; \ 204 (pr_reg)[3] = (regs)->r12; \ 205 (pr_reg)[4] = (regs)->bp; \ 206 (pr_reg)[5] = (regs)->bx; \ 207 (pr_reg)[6] = (regs)->r11; \ 208 (pr_reg)[7] = (regs)->r10; \ 209 (pr_reg)[8] = (regs)->r9; \ 210 (pr_reg)[9] = (regs)->r8; \ 211 (pr_reg)[10] = (regs)->ax; \ 212 (pr_reg)[11] = (regs)->cx; \ 213 (pr_reg)[12] = (regs)->dx; \ 214 (pr_reg)[13] = (regs)->si; \ 215 (pr_reg)[14] = (regs)->di; \ 216 (pr_reg)[15] = (regs)->orig_ax; \ 217 (pr_reg)[16] = (regs)->ip; \ 218 (pr_reg)[17] = (regs)->cs; \ 219 (pr_reg)[18] = (regs)->flags; \ 220 (pr_reg)[19] = (regs)->sp; \ 221 (pr_reg)[20] = (regs)->ss; \ 222 (pr_reg)[21] = current->thread.fs; \ 223 (pr_reg)[22] = current->thread.gs; \ 224 asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v; \ 225 asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v; \ 226 asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v; \ 227 asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v; \ 228 } while (0); 229 230 /* I'm not sure if we can use '-' here */ 231 #define ELF_PLATFORM ("x86_64") 232 extern void set_personality_64bit(void); 233 extern unsigned int sysctl_vsyscall32; 234 extern int force_personality32; 235 236 #endif /* !CONFIG_X86_32 */ 237 238 #define CORE_DUMP_USE_REGSET 239 #define ELF_EXEC_PAGESIZE 4096 240 241 /* This is the location that an ET_DYN program is loaded if exec'ed. Typical 242 use of this is to invoke "./ld.so someprog" to test out a new version of 243 the loader. We need to make sure that it is out of the way of the program 244 that it will "exec", and that there is sufficient room for the brk. */ 245 246 #define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2) 247 248 /* This yields a mask that user programs can use to figure out what 249 instruction set this CPU supports. This could be done in user space, 250 but it's not easy, and we've already done it here. */ 251 252 #define ELF_HWCAP (boot_cpu_data.x86_capability[0]) 253 254 /* This yields a string that ld.so will use to load implementation 255 specific libraries for optimization. This is more specific in 256 intent than poking at uname or /proc/cpuinfo. 257 258 For the moment, we have only optimizations for the Intel generations, 259 but that could change... */ 260 261 #define SET_PERSONALITY(ex) set_personality_64bit() 262 263 /* 264 * An executable for which elf_read_implies_exec() returns TRUE will 265 * have the READ_IMPLIES_EXEC personality flag set automatically. 266 */ 267 #define elf_read_implies_exec(ex, executable_stack) \ 268 (executable_stack != EXSTACK_DISABLE_X) 269 270 struct task_struct; 271 272 #define ARCH_DLINFO_IA32(vdso_enabled) \ 273 do { \ 274 if (vdso_enabled) { \ 275 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \ 276 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \ 277 } \ 278 } while (0) 279 280 #ifdef CONFIG_X86_32 281 282 #define STACK_RND_MASK (0x7ff) 283 284 #define VDSO_HIGH_BASE (__fix_to_virt(FIX_VDSO)) 285 286 #define ARCH_DLINFO ARCH_DLINFO_IA32(vdso_enabled) 287 288 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ 289 290 #else /* CONFIG_X86_32 */ 291 292 #define VDSO_HIGH_BASE 0xffffe000U /* CONFIG_COMPAT_VDSO address */ 293 294 /* 1GB for 64bit, 8MB for 32bit */ 295 #define STACK_RND_MASK (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff) 296 297 #define ARCH_DLINFO \ 298 do { \ 299 if (vdso_enabled) \ 300 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 301 (unsigned long)current->mm->context.vdso); \ 302 } while (0) 303 304 #define ARCH_DLINFO_X32 \ 305 do { \ 306 if (vdso_enabled) \ 307 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 308 (unsigned long)current->mm->context.vdso); \ 309 } while (0) 310 311 #define AT_SYSINFO 32 312 313 #define COMPAT_ARCH_DLINFO \ 314 if (test_thread_flag(TIF_X32)) \ 315 ARCH_DLINFO_X32; \ 316 else \ 317 ARCH_DLINFO_IA32(sysctl_vsyscall32) 318 319 #define COMPAT_ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000) 320 321 #endif /* !CONFIG_X86_32 */ 322 323 #define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso) 324 325 #define VDSO_ENTRY \ 326 ((unsigned long)VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall)) 327 328 struct linux_binprm; 329 330 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 331 extern int arch_setup_additional_pages(struct linux_binprm *bprm, 332 int uses_interp); 333 extern int x32_setup_additional_pages(struct linux_binprm *bprm, 334 int uses_interp); 335 336 extern int syscall32_setup_pages(struct linux_binprm *, int exstack); 337 #define compat_arch_setup_additional_pages syscall32_setup_pages 338 339 extern unsigned long arch_randomize_brk(struct mm_struct *mm); 340 #define arch_randomize_brk arch_randomize_brk 341 342 /* 343 * True on X86_32 or when emulating IA32 on X86_64 344 */ 345 static inline int mmap_is_ia32(void) 346 { 347 #ifdef CONFIG_X86_32 348 return 1; 349 #endif 350 #ifdef CONFIG_IA32_EMULATION 351 if (test_thread_flag(TIF_ADDR32)) 352 return 1; 353 #endif 354 return 0; 355 } 356 357 /* Do not change the values. See get_align_mask() */ 358 enum align_flags { 359 ALIGN_VA_32 = BIT(0), 360 ALIGN_VA_64 = BIT(1), 361 }; 362 363 struct va_alignment { 364 int flags; 365 unsigned long mask; 366 } ____cacheline_aligned; 367 368 extern struct va_alignment va_align; 369 extern unsigned long align_vdso_addr(unsigned long); 370 #endif /* _ASM_X86_ELF_H */ 371