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(¤t->thread, _r, 0) 175 176 #define COMPAT_ELF_PLAT_INIT(regs, load_addr) \ 177 elf_common_init(¤t->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 */ 355