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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 | /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_ELF_H #define _ASM_X86_ELF_H /* * ELF register definitions.. */ #include <linux/thread_info.h> #include <asm/ptrace.h> #include <asm/user.h> #include <asm/auxvec.h> #include <asm/fsgsbase.h> typedef unsigned long elf_greg_t; #define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t)) typedef elf_greg_t elf_gregset_t[ELF_NGREG]; typedef struct user_i387_struct elf_fpregset_t; #ifdef __i386__ #define R_386_NONE 0 #define R_386_32 1 #define R_386_PC32 2 #define R_386_GOT32 3 #define R_386_PLT32 4 #define R_386_COPY 5 #define R_386_GLOB_DAT 6 #define R_386_JMP_SLOT 7 #define R_386_RELATIVE 8 #define R_386_GOTOFF 9 #define R_386_GOTPC 10 #define R_386_NUM 11 /* * These are used to set parameters in the core dumps. */ #define ELF_CLASS ELFCLASS32 #define ELF_DATA ELFDATA2LSB #define ELF_ARCH EM_386 #else /* x86-64 relocation types */ #define R_X86_64_NONE 0 /* No reloc */ #define R_X86_64_64 1 /* Direct 64 bit */ #define R_X86_64_PC32 2 /* PC relative 32 bit signed */ #define R_X86_64_GOT32 3 /* 32 bit GOT entry */ #define R_X86_64_PLT32 4 /* 32 bit PLT address */ #define R_X86_64_COPY 5 /* Copy symbol at runtime */ #define R_X86_64_GLOB_DAT 6 /* Create GOT entry */ #define R_X86_64_JUMP_SLOT 7 /* Create PLT entry */ #define R_X86_64_RELATIVE 8 /* Adjust by program base */ #define R_X86_64_GOTPCREL 9 /* 32 bit signed pc relative offset to GOT */ #define R_X86_64_32 10 /* Direct 32 bit zero extended */ #define R_X86_64_32S 11 /* Direct 32 bit sign extended */ #define R_X86_64_16 12 /* Direct 16 bit zero extended */ #define R_X86_64_PC16 13 /* 16 bit sign extended pc relative */ #define R_X86_64_8 14 /* Direct 8 bit sign extended */ #define R_X86_64_PC8 15 /* 8 bit sign extended pc relative */ #define R_X86_64_PC64 24 /* Place relative 64-bit signed */ /* * These are used to set parameters in the core dumps. */ #define ELF_CLASS ELFCLASS64 #define ELF_DATA ELFDATA2LSB #define ELF_ARCH EM_X86_64 #endif #include <asm/vdso.h> #ifdef CONFIG_X86_64 extern unsigned int vdso64_enabled; #endif #if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION) extern unsigned int vdso32_enabled; #endif /* * This is used to ensure we don't load something for the wrong architecture. */ #define elf_check_arch_ia32(x) \ (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486)) #include <asm/processor.h> #ifdef CONFIG_X86_32 #include <asm/desc.h> #define elf_check_arch(x) elf_check_arch_ia32(x) /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx contains a pointer to a function which might be registered using `atexit'. This provides a mean for the dynamic linker to call DT_FINI functions for shared libraries that have been loaded before the code runs. A value of 0 tells we have no such handler. We might as well make sure everything else is cleared too (except for %esp), just to make things more deterministic. */ #define ELF_PLAT_INIT(_r, load_addr) \ do { \ _r->bx = 0; _r->cx = 0; _r->dx = 0; \ _r->si = 0; _r->di = 0; _r->bp = 0; \ _r->ax = 0; \ } while (0) /* * regs is struct pt_regs, pr_reg is elf_gregset_t (which is * now struct_user_regs, they are different) */ #define ELF_CORE_COPY_REGS(pr_reg, regs) \ do { \ pr_reg[0] = regs->bx; \ pr_reg[1] = regs->cx; \ pr_reg[2] = regs->dx; \ pr_reg[3] = regs->si; \ pr_reg[4] = regs->di; \ pr_reg[5] = regs->bp; \ pr_reg[6] = regs->ax; \ pr_reg[7] = regs->ds; \ pr_reg[8] = regs->es; \ pr_reg[9] = regs->fs; \ savesegment(gs, pr_reg[10]); \ pr_reg[11] = regs->orig_ax; \ pr_reg[12] = regs->ip; \ pr_reg[13] = regs->cs; \ pr_reg[14] = regs->flags; \ pr_reg[15] = regs->sp; \ pr_reg[16] = regs->ss; \ } while (0); #define ELF_PLATFORM (utsname()->machine) #define set_personality_64bit() do { } while (0) #else /* CONFIG_X86_32 */ /* * This is used to ensure we don't load something for the wrong architecture. */ #define elf_check_arch(x) \ ((x)->e_machine == EM_X86_64) #define compat_elf_check_arch(x) \ (elf_check_arch_ia32(x) || \ (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64)) static inline void elf_common_init(struct thread_struct *t, struct pt_regs *regs, const u16 ds) { /* ax gets execve's return value. */ /*regs->ax = */ regs->bx = regs->cx = regs->dx = 0; regs->si = regs->di = regs->bp = 0; regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0; regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0; t->fsbase = t->gsbase = 0; t->fsindex = t->gsindex = 0; t->ds = t->es = ds; } #define ELF_PLAT_INIT(_r, load_addr) \ elf_common_init(¤t->thread, _r, 0) #define COMPAT_ELF_PLAT_INIT(regs, load_addr) \ elf_common_init(¤t->thread, regs, __USER_DS) void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp, bool x32); #define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \ compat_start_thread(regs, new_ip, new_sp, ex->e_machine == EM_X86_64) void set_personality_ia32(bool); #define COMPAT_SET_PERSONALITY(ex) \ set_personality_ia32((ex).e_machine == EM_X86_64) #define COMPAT_ELF_PLATFORM ("i686") /* * regs is struct pt_regs, pr_reg is elf_gregset_t (which is * now struct_user_regs, they are different). Assumes current is the process * getting dumped. */ #define ELF_CORE_COPY_REGS(pr_reg, regs) \ do { \ unsigned v; \ (pr_reg)[0] = (regs)->r15; \ (pr_reg)[1] = (regs)->r14; \ (pr_reg)[2] = (regs)->r13; \ (pr_reg)[3] = (regs)->r12; \ (pr_reg)[4] = (regs)->bp; \ (pr_reg)[5] = (regs)->bx; \ (pr_reg)[6] = (regs)->r11; \ (pr_reg)[7] = (regs)->r10; \ (pr_reg)[8] = (regs)->r9; \ (pr_reg)[9] = (regs)->r8; \ (pr_reg)[10] = (regs)->ax; \ (pr_reg)[11] = (regs)->cx; \ (pr_reg)[12] = (regs)->dx; \ (pr_reg)[13] = (regs)->si; \ (pr_reg)[14] = (regs)->di; \ (pr_reg)[15] = (regs)->orig_ax; \ (pr_reg)[16] = (regs)->ip; \ (pr_reg)[17] = (regs)->cs; \ (pr_reg)[18] = (regs)->flags; \ (pr_reg)[19] = (regs)->sp; \ (pr_reg)[20] = (regs)->ss; \ (pr_reg)[21] = x86_fsbase_read_cpu(); \ (pr_reg)[22] = x86_gsbase_read_cpu_inactive(); \ asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v; \ asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v; \ asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v; \ asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v; \ } while (0); /* I'm not sure if we can use '-' here */ #define ELF_PLATFORM ("x86_64") extern void set_personality_64bit(void); extern int force_personality32; #endif /* !CONFIG_X86_32 */ #define CORE_DUMP_USE_REGSET #define ELF_EXEC_PAGESIZE 4096 /* * This is the base location for PIE (ET_DYN with INTERP) loads. On * 64-bit, this is above 4GB to leave the entire 32-bit address * space open for things that want to use the area for 32-bit pointers. */ #define ELF_ET_DYN_BASE (mmap_is_ia32() ? 0x000400000UL : \ (DEFAULT_MAP_WINDOW / 3 * 2)) /* This yields a mask that user programs can use to figure out what instruction set this CPU supports. This could be done in user space, but it's not easy, and we've already done it here. */ #define ELF_HWCAP (boot_cpu_data.x86_capability[CPUID_1_EDX]) extern u32 elf_hwcap2; /* * HWCAP2 supplies mask with kernel enabled CPU features, so that * the application can discover that it can safely use them. * The bits are defined in uapi/asm/hwcap2.h. */ #define ELF_HWCAP2 (elf_hwcap2) /* This yields a string that ld.so will use to load implementation specific libraries for optimization. This is more specific in intent than poking at uname or /proc/cpuinfo. For the moment, we have only optimizations for the Intel generations, but that could change... */ #define SET_PERSONALITY(ex) set_personality_64bit() /* * An executable for which elf_read_implies_exec() returns TRUE will * have the READ_IMPLIES_EXEC personality flag set automatically. * * The decision process for determining the results are: * * CPU: | lacks NX* | has NX, ia32 | has NX, x86_64 | * ELF: | | | | * ---------------------|------------|------------------|----------------| * missing PT_GNU_STACK | exec-all | exec-all | exec-none | * PT_GNU_STACK == RWX | exec-stack | exec-stack | exec-stack | * PT_GNU_STACK == RW | exec-none | exec-none | exec-none | * * exec-all : all PROT_READ user mappings are executable, except when * backed by files on a noexec-filesystem. * exec-none : only PROT_EXEC user mappings are executable. * exec-stack: only the stack and PROT_EXEC user mappings are executable. * * *this column has no architectural effect: NX markings are ignored by * hardware, but may have behavioral effects when "wants X" collides with * "cannot be X" constraints in memory permission flags, as in * https://lkml.kernel.org/r/20190418055759.GA3155@mellanox.com * */ #define elf_read_implies_exec(ex, executable_stack) \ (mmap_is_ia32() && executable_stack == EXSTACK_DEFAULT) struct task_struct; #define ARCH_DLINFO_IA32 \ do { \ if (VDSO_CURRENT_BASE) { \ NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \ NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \ } \ NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ } while (0) /* * True on X86_32 or when emulating IA32 on X86_64 */ static inline int mmap_is_ia32(void) { return IS_ENABLED(CONFIG_X86_32) || (IS_ENABLED(CONFIG_COMPAT) && test_thread_flag(TIF_ADDR32)); } extern unsigned long task_size_32bit(void); extern unsigned long task_size_64bit(int full_addr_space); extern unsigned long get_mmap_base(int is_legacy); extern bool mmap_address_hint_valid(unsigned long addr, unsigned long len); extern unsigned long get_sigframe_size(void); #ifdef CONFIG_X86_32 #define __STACK_RND_MASK(is32bit) (0x7ff) #define STACK_RND_MASK (0x7ff) #define ARCH_DLINFO ARCH_DLINFO_IA32 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ #else /* CONFIG_X86_32 */ /* 1GB for 64bit, 8MB for 32bit */ #define __STACK_RND_MASK(is32bit) ((is32bit) ? 0x7ff : 0x3fffff) #define STACK_RND_MASK __STACK_RND_MASK(mmap_is_ia32()) #define ARCH_DLINFO \ do { \ if (vdso64_enabled) \ NEW_AUX_ENT(AT_SYSINFO_EHDR, \ (unsigned long __force)current->mm->context.vdso); \ NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ } while (0) /* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */ #define ARCH_DLINFO_X32 \ do { \ if (vdso64_enabled) \ NEW_AUX_ENT(AT_SYSINFO_EHDR, \ (unsigned long __force)current->mm->context.vdso); \ NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ } while (0) #define AT_SYSINFO 32 #define COMPAT_ARCH_DLINFO \ if (exec->e_machine == EM_X86_64) \ ARCH_DLINFO_X32; \ else if (IS_ENABLED(CONFIG_IA32_EMULATION)) \ ARCH_DLINFO_IA32 #define COMPAT_ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000) #endif /* !CONFIG_X86_32 */ #define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso) #define VDSO_ENTRY \ ((unsigned long)current->mm->context.vdso + \ vdso_image_32.sym___kernel_vsyscall) struct linux_binprm; #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 extern int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp); extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp, bool x32); #define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \ compat_arch_setup_additional_pages(bprm, interpreter, \ (ex->e_machine == EM_X86_64)) extern bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs); /* Do not change the values. See get_align_mask() */ enum align_flags { ALIGN_VA_32 = BIT(0), ALIGN_VA_64 = BIT(1), }; struct va_alignment { int flags; unsigned long mask; unsigned long bits; } ____cacheline_aligned; extern struct va_alignment va_align; extern unsigned long align_vdso_addr(unsigned long); #endif /* _ASM_X86_ELF_H */ |