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_COMPAT) 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 regs->ax = regs->bx = regs->cx = regs->dx = 0; 175 regs->si = regs->di = regs->bp = 0; 176 regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0; 177 regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0; 178 t->fs = t->gs = 0; 179 t->fsindex = t->gsindex = 0; 180 t->ds = t->es = ds; 181 } 182 183 #define ELF_PLAT_INIT(_r, load_addr) \ 184 elf_common_init(¤t->thread, _r, 0) 185 186 #define COMPAT_ELF_PLAT_INIT(regs, load_addr) \ 187 elf_common_init(¤t->thread, regs, __USER_DS) 188 189 void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp); 190 #define compat_start_thread start_thread_ia32 191 192 void set_personality_ia32(bool); 193 #define COMPAT_SET_PERSONALITY(ex) \ 194 set_personality_ia32((ex).e_machine == EM_X86_64) 195 196 #define COMPAT_ELF_PLATFORM ("i686") 197 198 /* 199 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is 200 * now struct_user_regs, they are different). Assumes current is the process 201 * getting dumped. 202 */ 203 204 #define ELF_CORE_COPY_REGS(pr_reg, regs) \ 205 do { \ 206 unsigned v; \ 207 (pr_reg)[0] = (regs)->r15; \ 208 (pr_reg)[1] = (regs)->r14; \ 209 (pr_reg)[2] = (regs)->r13; \ 210 (pr_reg)[3] = (regs)->r12; \ 211 (pr_reg)[4] = (regs)->bp; \ 212 (pr_reg)[5] = (regs)->bx; \ 213 (pr_reg)[6] = (regs)->r11; \ 214 (pr_reg)[7] = (regs)->r10; \ 215 (pr_reg)[8] = (regs)->r9; \ 216 (pr_reg)[9] = (regs)->r8; \ 217 (pr_reg)[10] = (regs)->ax; \ 218 (pr_reg)[11] = (regs)->cx; \ 219 (pr_reg)[12] = (regs)->dx; \ 220 (pr_reg)[13] = (regs)->si; \ 221 (pr_reg)[14] = (regs)->di; \ 222 (pr_reg)[15] = (regs)->orig_ax; \ 223 (pr_reg)[16] = (regs)->ip; \ 224 (pr_reg)[17] = (regs)->cs; \ 225 (pr_reg)[18] = (regs)->flags; \ 226 (pr_reg)[19] = (regs)->sp; \ 227 (pr_reg)[20] = (regs)->ss; \ 228 (pr_reg)[21] = current->thread.fs; \ 229 (pr_reg)[22] = current->thread.gs; \ 230 asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v; \ 231 asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v; \ 232 asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v; \ 233 asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v; \ 234 } while (0); 235 236 /* I'm not sure if we can use '-' here */ 237 #define ELF_PLATFORM ("x86_64") 238 extern void set_personality_64bit(void); 239 extern unsigned int sysctl_vsyscall32; 240 extern int force_personality32; 241 242 #endif /* !CONFIG_X86_32 */ 243 244 #define CORE_DUMP_USE_REGSET 245 #define ELF_EXEC_PAGESIZE 4096 246 247 /* This is the location that an ET_DYN program is loaded if exec'ed. Typical 248 use of this is to invoke "./ld.so someprog" to test out a new version of 249 the loader. We need to make sure that it is out of the way of the program 250 that it will "exec", and that there is sufficient room for the brk. */ 251 252 #define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2) 253 254 /* This yields a mask that user programs can use to figure out what 255 instruction set this CPU supports. This could be done in user space, 256 but it's not easy, and we've already done it here. */ 257 258 #define ELF_HWCAP (boot_cpu_data.x86_capability[0]) 259 260 /* This yields a string that ld.so will use to load implementation 261 specific libraries for optimization. This is more specific in 262 intent than poking at uname or /proc/cpuinfo. 263 264 For the moment, we have only optimizations for the Intel generations, 265 but that could change... */ 266 267 #define SET_PERSONALITY(ex) set_personality_64bit() 268 269 /* 270 * An executable for which elf_read_implies_exec() returns TRUE will 271 * have the READ_IMPLIES_EXEC personality flag set automatically. 272 */ 273 #define elf_read_implies_exec(ex, executable_stack) \ 274 (executable_stack != EXSTACK_DISABLE_X) 275 276 struct task_struct; 277 278 #define ARCH_DLINFO_IA32 \ 279 do { \ 280 if (vdso32_enabled) { \ 281 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \ 282 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \ 283 } \ 284 } while (0) 285 286 #ifdef CONFIG_X86_32 287 288 #define STACK_RND_MASK (0x7ff) 289 290 #define ARCH_DLINFO ARCH_DLINFO_IA32 291 292 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ 293 294 #else /* CONFIG_X86_32 */ 295 296 /* 1GB for 64bit, 8MB for 32bit */ 297 #define STACK_RND_MASK (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff) 298 299 #define ARCH_DLINFO \ 300 do { \ 301 if (vdso64_enabled) \ 302 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 303 (unsigned long __force)current->mm->context.vdso); \ 304 } while (0) 305 306 /* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */ 307 #define ARCH_DLINFO_X32 \ 308 do { \ 309 if (vdso64_enabled) \ 310 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 311 (unsigned long __force)current->mm->context.vdso); \ 312 } while (0) 313 314 #define AT_SYSINFO 32 315 316 #define COMPAT_ARCH_DLINFO \ 317 if (test_thread_flag(TIF_X32)) \ 318 ARCH_DLINFO_X32; \ 319 else \ 320 ARCH_DLINFO_IA32 321 322 #define COMPAT_ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000) 323 324 #endif /* !CONFIG_X86_32 */ 325 326 #define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso) 327 328 #define VDSO_ENTRY \ 329 ((unsigned long)current->mm->context.vdso + \ 330 selected_vdso32->sym___kernel_vsyscall) 331 332 struct linux_binprm; 333 334 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 335 extern int arch_setup_additional_pages(struct linux_binprm *bprm, 336 int uses_interp); 337 extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm, 338 int uses_interp); 339 #define compat_arch_setup_additional_pages compat_arch_setup_additional_pages 340 341 extern unsigned long arch_randomize_brk(struct mm_struct *mm); 342 #define arch_randomize_brk arch_randomize_brk 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 #ifdef CONFIG_X86_32 350 return 1; 351 #endif 352 #ifdef CONFIG_IA32_EMULATION 353 if (test_thread_flag(TIF_ADDR32)) 354 return 1; 355 #endif 356 return 0; 357 } 358 359 /* Do not change the values. See get_align_mask() */ 360 enum align_flags { 361 ALIGN_VA_32 = BIT(0), 362 ALIGN_VA_64 = BIT(1), 363 }; 364 365 struct va_alignment { 366 int flags; 367 unsigned long mask; 368 } ____cacheline_aligned; 369 370 extern struct va_alignment va_align; 371 extern unsigned long align_vdso_addr(unsigned long); 372 #endif /* _ASM_X86_ELF_H */ 373