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(¤t->thread, _r, 0) 186 187 #define COMPAT_ELF_PLAT_INIT(regs, load_addr) \ 188 elf_common_init(¤t->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 /* This yields a string that ld.so will use to load implementation 262 specific libraries for optimization. This is more specific in 263 intent than poking at uname or /proc/cpuinfo. 264 265 For the moment, we have only optimizations for the Intel generations, 266 but that could change... */ 267 268 #define SET_PERSONALITY(ex) set_personality_64bit() 269 270 /* 271 * An executable for which elf_read_implies_exec() returns TRUE will 272 * have the READ_IMPLIES_EXEC personality flag set automatically. 273 */ 274 #define elf_read_implies_exec(ex, executable_stack) \ 275 (executable_stack != EXSTACK_DISABLE_X) 276 277 struct task_struct; 278 279 #define ARCH_DLINFO_IA32 \ 280 do { \ 281 if (vdso32_enabled) { \ 282 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \ 283 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \ 284 } \ 285 } while (0) 286 287 #ifdef CONFIG_X86_32 288 289 #define STACK_RND_MASK (0x7ff) 290 291 #define ARCH_DLINFO ARCH_DLINFO_IA32 292 293 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ 294 295 #else /* CONFIG_X86_32 */ 296 297 /* 1GB for 64bit, 8MB for 32bit */ 298 #define STACK_RND_MASK (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff) 299 300 #define ARCH_DLINFO \ 301 do { \ 302 if (vdso64_enabled) \ 303 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 304 (unsigned long __force)current->mm->context.vdso); \ 305 } while (0) 306 307 /* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */ 308 #define ARCH_DLINFO_X32 \ 309 do { \ 310 if (vdso64_enabled) \ 311 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 312 (unsigned long __force)current->mm->context.vdso); \ 313 } while (0) 314 315 #define AT_SYSINFO 32 316 317 #define COMPAT_ARCH_DLINFO \ 318 if (test_thread_flag(TIF_X32)) \ 319 ARCH_DLINFO_X32; \ 320 else \ 321 ARCH_DLINFO_IA32 322 323 #define COMPAT_ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000) 324 325 #endif /* !CONFIG_X86_32 */ 326 327 #define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso) 328 329 #define VDSO_ENTRY \ 330 ((unsigned long)current->mm->context.vdso + \ 331 vdso_image_32.sym___kernel_vsyscall) 332 333 struct linux_binprm; 334 335 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 336 extern int arch_setup_additional_pages(struct linux_binprm *bprm, 337 int uses_interp); 338 extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm, 339 int uses_interp); 340 #define compat_arch_setup_additional_pages compat_arch_setup_additional_pages 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 return config_enabled(CONFIG_X86_32) || 348 (config_enabled(CONFIG_COMPAT) && 349 test_thread_flag(TIF_ADDR32)); 350 } 351 352 /* Do not change the values. See get_align_mask() */ 353 enum align_flags { 354 ALIGN_VA_32 = BIT(0), 355 ALIGN_VA_64 = BIT(1), 356 }; 357 358 struct va_alignment { 359 int flags; 360 unsigned long mask; 361 unsigned long bits; 362 } ____cacheline_aligned; 363 364 extern struct va_alignment va_align; 365 extern unsigned long align_vdso_addr(unsigned long); 366 #endif /* _ASM_X86_ELF_H */ 367