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/ia32.h> |
11 | #include <asm/ptrace.h> |
12 | #include <asm/user.h> |
13 | #include <asm/auxvec.h> |
14 | #include <asm/fsgsbase.h> |
15 | |
16 | typedef unsigned long elf_greg_t; |
17 | |
18 | #define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t)) |
19 | typedef elf_greg_t elf_gregset_t[ELF_NGREG]; |
20 | |
21 | typedef struct user_i387_struct elf_fpregset_t; |
22 | |
23 | #ifdef __i386__ |
24 | |
25 | #define R_386_NONE 0 |
26 | #define R_386_32 1 |
27 | #define R_386_PC32 2 |
28 | #define R_386_GOT32 3 |
29 | #define R_386_PLT32 4 |
30 | #define R_386_COPY 5 |
31 | #define R_386_GLOB_DAT 6 |
32 | #define R_386_JMP_SLOT 7 |
33 | #define R_386_RELATIVE 8 |
34 | #define R_386_GOTOFF 9 |
35 | #define R_386_GOTPC 10 |
36 | #define R_386_NUM 11 |
37 | |
38 | /* |
39 | * These are used to set parameters in the core dumps. |
40 | */ |
41 | #define ELF_CLASS ELFCLASS32 |
42 | #define ELF_DATA ELFDATA2LSB |
43 | #define ELF_ARCH EM_386 |
44 | |
45 | #else |
46 | |
47 | /* x86-64 relocation types */ |
48 | #define R_X86_64_NONE 0 /* No reloc */ |
49 | #define R_X86_64_64 1 /* Direct 64 bit */ |
50 | #define R_X86_64_PC32 2 /* PC relative 32 bit signed */ |
51 | #define R_X86_64_GOT32 3 /* 32 bit GOT entry */ |
52 | #define R_X86_64_PLT32 4 /* 32 bit PLT address */ |
53 | #define R_X86_64_COPY 5 /* Copy symbol at runtime */ |
54 | #define R_X86_64_GLOB_DAT 6 /* Create GOT entry */ |
55 | #define R_X86_64_JUMP_SLOT 7 /* Create PLT entry */ |
56 | #define R_X86_64_RELATIVE 8 /* Adjust by program base */ |
57 | #define R_X86_64_GOTPCREL 9 /* 32 bit signed pc relative offset to GOT */ |
58 | #define R_X86_64_GOTPCRELX 41 |
59 | #define R_X86_64_REX_GOTPCRELX 42 |
60 | #define R_X86_64_32 10 /* Direct 32 bit zero extended */ |
61 | #define R_X86_64_32S 11 /* Direct 32 bit sign extended */ |
62 | #define R_X86_64_16 12 /* Direct 16 bit zero extended */ |
63 | #define R_X86_64_PC16 13 /* 16 bit sign extended pc relative */ |
64 | #define R_X86_64_8 14 /* Direct 8 bit sign extended */ |
65 | #define R_X86_64_PC8 15 /* 8 bit sign extended pc relative */ |
66 | #define R_X86_64_PC64 24 /* Place relative 64-bit signed */ |
67 | |
68 | /* |
69 | * These are used to set parameters in the core dumps. |
70 | */ |
71 | #define ELF_CLASS ELFCLASS64 |
72 | #define ELF_DATA ELFDATA2LSB |
73 | #define ELF_ARCH EM_X86_64 |
74 | |
75 | #endif |
76 | |
77 | #include <asm/vdso.h> |
78 | |
79 | extern unsigned int vdso64_enabled; |
80 | extern unsigned int vdso32_enabled; |
81 | |
82 | /* |
83 | * This is used to ensure we don't load something for the wrong architecture. |
84 | */ |
85 | #define elf_check_arch_ia32(x) \ |
86 | (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486)) |
87 | |
88 | #include <asm/processor.h> |
89 | |
90 | #ifdef CONFIG_X86_32 |
91 | #include <asm/desc.h> |
92 | |
93 | #define elf_check_arch(x) elf_check_arch_ia32(x) |
94 | |
95 | /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx |
96 | contains a pointer to a function which might be registered using `atexit'. |
97 | This provides a mean for the dynamic linker to call DT_FINI functions for |
98 | shared libraries that have been loaded before the code runs. |
99 | |
100 | A value of 0 tells we have no such handler. |
101 | |
102 | We might as well make sure everything else is cleared too (except for %esp), |
103 | just to make things more deterministic. |
104 | */ |
105 | #define ELF_PLAT_INIT(_r, load_addr) \ |
106 | do { \ |
107 | _r->bx = 0; _r->cx = 0; _r->dx = 0; \ |
108 | _r->si = 0; _r->di = 0; _r->bp = 0; \ |
109 | _r->ax = 0; \ |
110 | } while (0) |
111 | |
112 | /* |
113 | * regs is struct pt_regs, pr_reg is elf_gregset_t (which is |
114 | * now struct_user_regs, they are different) |
115 | */ |
116 | |
117 | #define ELF_CORE_COPY_REGS(pr_reg, regs) \ |
118 | do { \ |
119 | pr_reg[0] = regs->bx; \ |
120 | pr_reg[1] = regs->cx; \ |
121 | pr_reg[2] = regs->dx; \ |
122 | pr_reg[3] = regs->si; \ |
123 | pr_reg[4] = regs->di; \ |
124 | pr_reg[5] = regs->bp; \ |
125 | pr_reg[6] = regs->ax; \ |
126 | pr_reg[7] = regs->ds; \ |
127 | pr_reg[8] = regs->es; \ |
128 | pr_reg[9] = regs->fs; \ |
129 | savesegment(gs, pr_reg[10]); \ |
130 | pr_reg[11] = regs->orig_ax; \ |
131 | pr_reg[12] = regs->ip; \ |
132 | pr_reg[13] = regs->cs; \ |
133 | pr_reg[14] = regs->flags; \ |
134 | pr_reg[15] = regs->sp; \ |
135 | pr_reg[16] = regs->ss; \ |
136 | } while (0); |
137 | |
138 | #define ELF_PLATFORM (utsname()->machine) |
139 | #define set_personality_64bit() do { } while (0) |
140 | |
141 | #else /* CONFIG_X86_32 */ |
142 | |
143 | /* |
144 | * This is used to ensure we don't load something for the wrong architecture. |
145 | */ |
146 | #define elf_check_arch(x) \ |
147 | ((x)->e_machine == EM_X86_64) |
148 | |
149 | #define compat_elf_check_arch(x) \ |
150 | ((elf_check_arch_ia32(x) && ia32_enabled_verbose()) || \ |
151 | (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64)) |
152 | |
153 | static inline void elf_common_init(struct thread_struct *t, |
154 | struct pt_regs *regs, const u16 ds) |
155 | { |
156 | /* ax gets execve's return value. */ |
157 | /*regs->ax = */ regs->bx = regs->cx = regs->dx = 0; |
158 | regs->si = regs->di = regs->bp = 0; |
159 | regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0; |
160 | regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0; |
161 | t->fsbase = t->gsbase = 0; |
162 | t->fsindex = t->gsindex = 0; |
163 | t->ds = t->es = ds; |
164 | } |
165 | |
166 | #define ELF_PLAT_INIT(_r, load_addr) \ |
167 | elf_common_init(¤t->thread, _r, 0) |
168 | |
169 | #define COMPAT_ELF_PLAT_INIT(regs, load_addr) \ |
170 | elf_common_init(¤t->thread, regs, __USER_DS) |
171 | |
172 | void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp, bool x32); |
173 | #define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \ |
174 | compat_start_thread(regs, new_ip, new_sp, ex->e_machine == EM_X86_64) |
175 | |
176 | void set_personality_ia32(bool); |
177 | #define COMPAT_SET_PERSONALITY(ex) \ |
178 | set_personality_ia32((ex).e_machine == EM_X86_64) |
179 | |
180 | #define COMPAT_ELF_PLATFORM ("i686") |
181 | |
182 | /* |
183 | * regs is struct pt_regs, pr_reg is elf_gregset_t (which is |
184 | * now struct_user_regs, they are different). Assumes current is the process |
185 | * getting dumped. |
186 | */ |
187 | |
188 | #define ELF_CORE_COPY_REGS(pr_reg, regs) \ |
189 | do { \ |
190 | unsigned v; \ |
191 | (pr_reg)[0] = (regs)->r15; \ |
192 | (pr_reg)[1] = (regs)->r14; \ |
193 | (pr_reg)[2] = (regs)->r13; \ |
194 | (pr_reg)[3] = (regs)->r12; \ |
195 | (pr_reg)[4] = (regs)->bp; \ |
196 | (pr_reg)[5] = (regs)->bx; \ |
197 | (pr_reg)[6] = (regs)->r11; \ |
198 | (pr_reg)[7] = (regs)->r10; \ |
199 | (pr_reg)[8] = (regs)->r9; \ |
200 | (pr_reg)[9] = (regs)->r8; \ |
201 | (pr_reg)[10] = (regs)->ax; \ |
202 | (pr_reg)[11] = (regs)->cx; \ |
203 | (pr_reg)[12] = (regs)->dx; \ |
204 | (pr_reg)[13] = (regs)->si; \ |
205 | (pr_reg)[14] = (regs)->di; \ |
206 | (pr_reg)[15] = (regs)->orig_ax; \ |
207 | (pr_reg)[16] = (regs)->ip; \ |
208 | (pr_reg)[17] = (regs)->cs; \ |
209 | (pr_reg)[18] = (regs)->flags; \ |
210 | (pr_reg)[19] = (regs)->sp; \ |
211 | (pr_reg)[20] = (regs)->ss; \ |
212 | (pr_reg)[21] = x86_fsbase_read_cpu(); \ |
213 | (pr_reg)[22] = x86_gsbase_read_cpu_inactive(); \ |
214 | asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v; \ |
215 | asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v; \ |
216 | asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v; \ |
217 | asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v; \ |
218 | } while (0); |
219 | |
220 | /* I'm not sure if we can use '-' here */ |
221 | #define ELF_PLATFORM ("x86_64") |
222 | extern void set_personality_64bit(void); |
223 | extern int force_personality32; |
224 | |
225 | #endif /* !CONFIG_X86_32 */ |
226 | |
227 | #define CORE_DUMP_USE_REGSET |
228 | #define ELF_EXEC_PAGESIZE 4096 |
229 | |
230 | /* |
231 | * This is the base location for PIE (ET_DYN with INTERP) loads. On |
232 | * 64-bit, this is above 4GB to leave the entire 32-bit address |
233 | * space open for things that want to use the area for 32-bit pointers. |
234 | */ |
235 | #define ELF_ET_DYN_BASE (mmap_is_ia32() ? 0x000400000UL : \ |
236 | (DEFAULT_MAP_WINDOW / 3 * 2)) |
237 | |
238 | /* This yields a mask that user programs can use to figure out what |
239 | instruction set this CPU supports. This could be done in user space, |
240 | but it's not easy, and we've already done it here. */ |
241 | |
242 | #define ELF_HWCAP (boot_cpu_data.x86_capability[CPUID_1_EDX]) |
243 | |
244 | extern u32 elf_hwcap2; |
245 | |
246 | /* |
247 | * HWCAP2 supplies mask with kernel enabled CPU features, so that |
248 | * the application can discover that it can safely use them. |
249 | * The bits are defined in uapi/asm/hwcap2.h. |
250 | */ |
251 | #define ELF_HWCAP2 (elf_hwcap2) |
252 | |
253 | /* This yields a string that ld.so will use to load implementation |
254 | specific libraries for optimization. This is more specific in |
255 | intent than poking at uname or /proc/cpuinfo. |
256 | |
257 | For the moment, we have only optimizations for the Intel generations, |
258 | but that could change... */ |
259 | |
260 | #define SET_PERSONALITY(ex) set_personality_64bit() |
261 | |
262 | /* |
263 | * An executable for which elf_read_implies_exec() returns TRUE will |
264 | * have the READ_IMPLIES_EXEC personality flag set automatically. |
265 | * |
266 | * The decision process for determining the results are: |
267 | * |
268 | * CPU: | lacks NX* | has NX, ia32 | has NX, x86_64 | |
269 | * ELF: | | | | |
270 | * ---------------------|------------|------------------|----------------| |
271 | * missing PT_GNU_STACK | exec-all | exec-all | exec-none | |
272 | * PT_GNU_STACK == RWX | exec-stack | exec-stack | exec-stack | |
273 | * PT_GNU_STACK == RW | exec-none | exec-none | exec-none | |
274 | * |
275 | * exec-all : all PROT_READ user mappings are executable, except when |
276 | * backed by files on a noexec-filesystem. |
277 | * exec-none : only PROT_EXEC user mappings are executable. |
278 | * exec-stack: only the stack and PROT_EXEC user mappings are executable. |
279 | * |
280 | * *this column has no architectural effect: NX markings are ignored by |
281 | * hardware, but may have behavioral effects when "wants X" collides with |
282 | * "cannot be X" constraints in memory permission flags, as in |
283 | * https://lkml.kernel.org/r/20190418055759.GA3155@mellanox.com |
284 | * |
285 | */ |
286 | #define elf_read_implies_exec(ex, executable_stack) \ |
287 | (mmap_is_ia32() && executable_stack == EXSTACK_DEFAULT) |
288 | |
289 | struct task_struct; |
290 | |
291 | #define ARCH_DLINFO_IA32 \ |
292 | do { \ |
293 | if (VDSO_CURRENT_BASE) { \ |
294 | NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \ |
295 | NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \ |
296 | } \ |
297 | NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ |
298 | } while (0) |
299 | |
300 | /* |
301 | * True on X86_32 or when emulating IA32 on X86_64 |
302 | */ |
303 | static inline int mmap_is_ia32(void) |
304 | { |
305 | return IS_ENABLED(CONFIG_X86_32) || |
306 | (IS_ENABLED(CONFIG_COMPAT) && |
307 | test_thread_flag(TIF_ADDR32)); |
308 | } |
309 | |
310 | extern unsigned long task_size_32bit(void); |
311 | extern unsigned long task_size_64bit(int full_addr_space); |
312 | extern unsigned long get_mmap_base(int is_legacy); |
313 | extern bool mmap_address_hint_valid(unsigned long addr, unsigned long len); |
314 | extern unsigned long get_sigframe_size(void); |
315 | |
316 | #ifdef CONFIG_X86_32 |
317 | |
318 | #define __STACK_RND_MASK(is32bit) (0x7ff) |
319 | #define STACK_RND_MASK (0x7ff) |
320 | |
321 | #define ARCH_DLINFO ARCH_DLINFO_IA32 |
322 | |
323 | /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ |
324 | |
325 | #else /* CONFIG_X86_32 */ |
326 | |
327 | /* 1GB for 64bit, 8MB for 32bit */ |
328 | #define __STACK_RND_MASK(is32bit) ((is32bit) ? 0x7ff : 0x3fffff) |
329 | #define STACK_RND_MASK __STACK_RND_MASK(mmap_is_ia32()) |
330 | |
331 | #define ARCH_DLINFO \ |
332 | do { \ |
333 | if (vdso64_enabled) \ |
334 | NEW_AUX_ENT(AT_SYSINFO_EHDR, \ |
335 | (unsigned long __force)current->mm->context.vdso); \ |
336 | NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ |
337 | } while (0) |
338 | |
339 | /* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */ |
340 | #define ARCH_DLINFO_X32 \ |
341 | do { \ |
342 | if (vdso64_enabled) \ |
343 | NEW_AUX_ENT(AT_SYSINFO_EHDR, \ |
344 | (unsigned long __force)current->mm->context.vdso); \ |
345 | NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ |
346 | } while (0) |
347 | |
348 | #define AT_SYSINFO 32 |
349 | |
350 | #define COMPAT_ARCH_DLINFO \ |
351 | if (exec->e_machine == EM_X86_64) \ |
352 | ARCH_DLINFO_X32; \ |
353 | else if (IS_ENABLED(CONFIG_IA32_EMULATION)) \ |
354 | ARCH_DLINFO_IA32 |
355 | |
356 | #define COMPAT_ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000) |
357 | |
358 | #endif /* !CONFIG_X86_32 */ |
359 | |
360 | #define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso) |
361 | |
362 | #define VDSO_ENTRY \ |
363 | ((unsigned long)current->mm->context.vdso + \ |
364 | vdso_image_32.sym___kernel_vsyscall) |
365 | |
366 | struct linux_binprm; |
367 | |
368 | #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 |
369 | extern int arch_setup_additional_pages(struct linux_binprm *bprm, |
370 | int uses_interp); |
371 | extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm, |
372 | int uses_interp, bool x32); |
373 | #define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \ |
374 | compat_arch_setup_additional_pages(bprm, interpreter, \ |
375 | (ex->e_machine == EM_X86_64)) |
376 | |
377 | extern bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs); |
378 | |
379 | /* Do not change the values. See get_align_mask() */ |
380 | enum align_flags { |
381 | ALIGN_VA_32 = BIT(0), |
382 | ALIGN_VA_64 = BIT(1), |
383 | }; |
384 | |
385 | struct va_alignment { |
386 | int flags; |
387 | unsigned long mask; |
388 | unsigned long bits; |
389 | } ____cacheline_aligned; |
390 | |
391 | extern struct va_alignment va_align; |
392 | #endif /* _ASM_X86_ELF_H */ |
393 | |