1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _ASM_X86_ELF_H 3#define _ASM_X86_ELF_H 4 5/* 6 * ELF register definitions.. 7 */ 8#include <linux/thread_info.h> 9 10#include <asm/ptrace.h> 11#include <asm/user.h> 12#include <asm/auxvec.h> 13#include <asm/fsgsbase.h> 14 15typedef unsigned long elf_greg_t; 16 17#define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t)) 18typedef elf_greg_t elf_gregset_t[ELF_NGREG]; 19 20typedef struct user_i387_struct elf_fpregset_t; 21 22#ifdef __i386__ 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#define R_X86_64_PC64 24 /* Place relative 64-bit signed */ 65 66/* 67 * These are used to set parameters in the core dumps. 68 */ 69#define ELF_CLASS ELFCLASS64 70#define ELF_DATA ELFDATA2LSB 71#define ELF_ARCH EM_X86_64 72 73#endif 74 75#include <asm/vdso.h> 76 77#ifdef CONFIG_X86_64 78extern unsigned int vdso64_enabled; 79#endif 80#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION) 81extern unsigned int vdso32_enabled; 82#endif 83 84/* 85 * This is used to ensure we don't load something for the wrong architecture. 86 */ 87#define elf_check_arch_ia32(x) \ 88 (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486)) 89 90#include <asm/processor.h> 91 92#ifdef CONFIG_X86_32 93#include <asm/desc.h> 94 95#define elf_check_arch(x) elf_check_arch_ia32(x) 96 97/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx 98 contains a pointer to a function which might be registered using `atexit'. 99 This provides a mean for the dynamic linker to call DT_FINI functions for 100 shared libraries that have been loaded before the code runs. 101 102 A value of 0 tells we have no such handler. 103 104 We might as well make sure everything else is cleared too (except for %esp), 105 just to make things more deterministic. 106 */ 107#define ELF_PLAT_INIT(_r, load_addr) \ 108 do { \ 109 _r->bx = 0; _r->cx = 0; _r->dx = 0; \ 110 _r->si = 0; _r->di = 0; _r->bp = 0; \ 111 _r->ax = 0; \ 112} while (0) 113 114/* 115 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is 116 * now struct_user_regs, they are different) 117 */ 118 119#define ELF_CORE_COPY_REGS(pr_reg, regs) \ 120do { \ 121 pr_reg[0] = regs->bx; \ 122 pr_reg[1] = regs->cx; \ 123 pr_reg[2] = regs->dx; \ 124 pr_reg[3] = regs->si; \ 125 pr_reg[4] = regs->di; \ 126 pr_reg[5] = regs->bp; \ 127 pr_reg[6] = regs->ax; \ 128 pr_reg[7] = regs->ds; \ 129 pr_reg[8] = regs->es; \ 130 pr_reg[9] = regs->fs; \ 131 savesegment(gs, pr_reg[10]); \ 132 pr_reg[11] = regs->orig_ax; \ 133 pr_reg[12] = regs->ip; \ 134 pr_reg[13] = regs->cs; \ 135 pr_reg[14] = regs->flags; \ 136 pr_reg[15] = regs->sp; \ 137 pr_reg[16] = regs->ss; \ 138} while (0); 139 140#define ELF_PLATFORM (utsname()->machine) 141#define set_personality_64bit() do { } while (0) 142 143#else /* CONFIG_X86_32 */ 144 145/* 146 * This is used to ensure we don't load something for the wrong architecture. 147 */ 148#define elf_check_arch(x) \ 149 ((x)->e_machine == EM_X86_64) 150 151#define compat_elf_check_arch(x) \ 152 (elf_check_arch_ia32(x) || \ 153 (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64)) 154 155static inline void elf_common_init(struct thread_struct *t, 156 struct pt_regs *regs, const u16 ds) 157{ 158 /* ax gets execve's return value. */ 159 /*regs->ax = */ regs->bx = regs->cx = regs->dx = 0; 160 regs->si = regs->di = regs->bp = 0; 161 regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0; 162 regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0; 163 t->fsbase = t->gsbase = 0; 164 t->fsindex = t->gsindex = 0; 165 t->ds = t->es = ds; 166} 167 168#define ELF_PLAT_INIT(_r, load_addr) \ 169 elf_common_init(¤t->thread, _r, 0) 170 171#define COMPAT_ELF_PLAT_INIT(regs, load_addr) \ 172 elf_common_init(¤t->thread, regs, __USER_DS) 173 174void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp, bool x32); 175#define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \ 176 compat_start_thread(regs, new_ip, new_sp, ex->e_machine == EM_X86_64) 177 178void set_personality_ia32(bool); 179#define COMPAT_SET_PERSONALITY(ex) \ 180 set_personality_ia32((ex).e_machine == EM_X86_64) 181 182#define COMPAT_ELF_PLATFORM ("i686") 183 184/* 185 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is 186 * now struct_user_regs, they are different). Assumes current is the process 187 * getting dumped. 188 */ 189 190#define ELF_CORE_COPY_REGS(pr_reg, regs) \ 191do { \ 192 unsigned v; \ 193 (pr_reg)[0] = (regs)->r15; \ 194 (pr_reg)[1] = (regs)->r14; \ 195 (pr_reg)[2] = (regs)->r13; \ 196 (pr_reg)[3] = (regs)->r12; \ 197 (pr_reg)[4] = (regs)->bp; \ 198 (pr_reg)[5] = (regs)->bx; \ 199 (pr_reg)[6] = (regs)->r11; \ 200 (pr_reg)[7] = (regs)->r10; \ 201 (pr_reg)[8] = (regs)->r9; \ 202 (pr_reg)[9] = (regs)->r8; \ 203 (pr_reg)[10] = (regs)->ax; \ 204 (pr_reg)[11] = (regs)->cx; \ 205 (pr_reg)[12] = (regs)->dx; \ 206 (pr_reg)[13] = (regs)->si; \ 207 (pr_reg)[14] = (regs)->di; \ 208 (pr_reg)[15] = (regs)->orig_ax; \ 209 (pr_reg)[16] = (regs)->ip; \ 210 (pr_reg)[17] = (regs)->cs; \ 211 (pr_reg)[18] = (regs)->flags; \ 212 (pr_reg)[19] = (regs)->sp; \ 213 (pr_reg)[20] = (regs)->ss; \ 214 (pr_reg)[21] = x86_fsbase_read_cpu(); \ 215 (pr_reg)[22] = x86_gsbase_read_cpu_inactive(); \ 216 asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v; \ 217 asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v; \ 218 asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v; \ 219 asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v; \ 220} while (0); 221 222/* I'm not sure if we can use '-' here */ 223#define ELF_PLATFORM ("x86_64") 224extern void set_personality_64bit(void); 225extern int force_personality32; 226 227#endif /* !CONFIG_X86_32 */ 228 229#define CORE_DUMP_USE_REGSET 230#define ELF_EXEC_PAGESIZE 4096 231 232/* 233 * This is the base location for PIE (ET_DYN with INTERP) loads. On 234 * 64-bit, this is above 4GB to leave the entire 32-bit address 235 * space open for things that want to use the area for 32-bit pointers. 236 */ 237#define ELF_ET_DYN_BASE (mmap_is_ia32() ? 0x000400000UL : \ 238 (DEFAULT_MAP_WINDOW / 3 * 2)) 239 240/* This yields a mask that user programs can use to figure out what 241 instruction set this CPU supports. This could be done in user space, 242 but it's not easy, and we've already done it here. */ 243 244#define ELF_HWCAP (boot_cpu_data.x86_capability[CPUID_1_EDX]) 245 246extern u32 elf_hwcap2; 247 248/* 249 * HWCAP2 supplies mask with kernel enabled CPU features, so that 250 * the application can discover that it can safely use them. 251 * The bits are defined in uapi/asm/hwcap2.h. 252 */ 253#define ELF_HWCAP2 (elf_hwcap2) 254 255/* This yields a string that ld.so will use to load implementation 256 specific libraries for optimization. This is more specific in 257 intent than poking at uname or /proc/cpuinfo. 258 259 For the moment, we have only optimizations for the Intel generations, 260 but that could change... */ 261 262#define SET_PERSONALITY(ex) set_personality_64bit() 263 264/* 265 * An executable for which elf_read_implies_exec() returns TRUE will 266 * have the READ_IMPLIES_EXEC personality flag set automatically. 267 * 268 * The decision process for determining the results are: 269 * 270 * CPU: | lacks NX* | has NX, ia32 | has NX, x86_64 | 271 * ELF: | | | | 272 * ---------------------|------------|------------------|----------------| 273 * missing PT_GNU_STACK | exec-all | exec-all | exec-none | 274 * PT_GNU_STACK == RWX | exec-stack | exec-stack | exec-stack | 275 * PT_GNU_STACK == RW | exec-none | exec-none | exec-none | 276 * 277 * exec-all : all PROT_READ user mappings are executable, except when 278 * backed by files on a noexec-filesystem. 279 * exec-none : only PROT_EXEC user mappings are executable. 280 * exec-stack: only the stack and PROT_EXEC user mappings are executable. 281 * 282 * *this column has no architectural effect: NX markings are ignored by 283 * hardware, but may have behavioral effects when "wants X" collides with 284 * "cannot be X" constraints in memory permission flags, as in 285 * https://lkml.kernel.org/r/20190418055759.GA3155@mellanox.com 286 * 287 */ 288#define elf_read_implies_exec(ex, executable_stack) \ 289 (mmap_is_ia32() && executable_stack == EXSTACK_DEFAULT) 290 291struct task_struct; 292 293#define ARCH_DLINFO_IA32 \ 294do { \ 295 if (VDSO_CURRENT_BASE) { \ 296 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \ 297 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \ 298 } \ 299 NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ 300} while (0) 301 302/* 303 * True on X86_32 or when emulating IA32 on X86_64 304 */ 305static inline int mmap_is_ia32(void) 306{ 307 return IS_ENABLED(CONFIG_X86_32) || 308 (IS_ENABLED(CONFIG_COMPAT) && 309 test_thread_flag(TIF_ADDR32)); 310} 311 312extern unsigned long task_size_32bit(void); 313extern unsigned long task_size_64bit(int full_addr_space); 314extern unsigned long get_mmap_base(int is_legacy); 315extern bool mmap_address_hint_valid(unsigned long addr, unsigned long len); 316extern unsigned long get_sigframe_size(void); 317 318#ifdef CONFIG_X86_32 319 320#define __STACK_RND_MASK(is32bit) (0x7ff) 321#define STACK_RND_MASK (0x7ff) 322 323#define ARCH_DLINFO ARCH_DLINFO_IA32 324 325/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ 326 327#else /* CONFIG_X86_32 */ 328 329/* 1GB for 64bit, 8MB for 32bit */ 330#define __STACK_RND_MASK(is32bit) ((is32bit) ? 0x7ff : 0x3fffff) 331#define STACK_RND_MASK __STACK_RND_MASK(mmap_is_ia32()) 332 333#define ARCH_DLINFO \ 334do { \ 335 if (vdso64_enabled) \ 336 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 337 (unsigned long __force)current->mm->context.vdso); \ 338 NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ 339} while (0) 340 341/* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */ 342#define ARCH_DLINFO_X32 \ 343do { \ 344 if (vdso64_enabled) \ 345 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 346 (unsigned long __force)current->mm->context.vdso); \ 347 NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ 348} while (0) 349 350#define AT_SYSINFO 32 351 352#define COMPAT_ARCH_DLINFO \ 353if (exec->e_machine == EM_X86_64) \ 354 ARCH_DLINFO_X32; \ 355else if (IS_ENABLED(CONFIG_IA32_EMULATION)) \ 356 ARCH_DLINFO_IA32 357 358#define COMPAT_ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000) 359 360#endif /* !CONFIG_X86_32 */ 361 362#define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso) 363 364#define VDSO_ENTRY \ 365 ((unsigned long)current->mm->context.vdso + \ 366 vdso_image_32.sym___kernel_vsyscall) 367 368struct linux_binprm; 369 370#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 371extern int arch_setup_additional_pages(struct linux_binprm *bprm, 372 int uses_interp); 373extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm, 374 int uses_interp, bool x32); 375#define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \ 376 compat_arch_setup_additional_pages(bprm, interpreter, \ 377 (ex->e_machine == EM_X86_64)) 378 379extern bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs); 380 381/* Do not change the values. See get_align_mask() */ 382enum align_flags { 383 ALIGN_VA_32 = BIT(0), 384 ALIGN_VA_64 = BIT(1), 385}; 386 387struct va_alignment { 388 int flags; 389 unsigned long mask; 390 unsigned long bits; 391} ____cacheline_aligned; 392 393extern struct va_alignment va_align; 394extern unsigned long align_vdso_addr(unsigned long); 395#endif /* _ASM_X86_ELF_H */ 396