blob: 69c0f892e310a37a9f8bd543227a73104616b5df [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
H. Peter Anvin1965aae2008-10-22 22:26:29 -07002#ifndef _ASM_X86_ELF_H
3#define _ASM_X86_ELF_H
Thomas Gleixner2439a792007-10-23 22:37:23 +02004
5/*
6 * ELF register definitions..
7 */
Borislav Petkovdfb09f92011-08-05 15:15:08 +02008#include <linux/thread_info.h>
Thomas Gleixner2439a792007-10-23 22:37:23 +02009
10#include <asm/ptrace.h>
11#include <asm/user.h>
12#include <asm/auxvec.h>
Chang S. Bae824eea32018-09-18 16:08:55 -070013#include <asm/fsgsbase.h>
Thomas Gleixner2439a792007-10-23 22:37:23 +020014
15typedef unsigned long elf_greg_t;
16
Joe Perches486386f62008-03-23 01:02:08 -070017#define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
Thomas Gleixner2439a792007-10-23 22:37:23 +020018typedef elf_greg_t elf_gregset_t[ELF_NGREG];
19
20typedef struct user_i387_struct elf_fpregset_t;
21
22#ifdef __i386__
23
24typedef struct user_fxsr_struct elf_fpxregset_t;
25
26#define R_386_NONE 0
27#define R_386_32 1
28#define R_386_PC32 2
29#define R_386_GOT32 3
30#define R_386_PLT32 4
31#define R_386_COPY 5
32#define R_386_GLOB_DAT 6
33#define R_386_JMP_SLOT 7
34#define R_386_RELATIVE 8
35#define R_386_GOTOFF 9
36#define R_386_GOTPC 10
37#define R_386_NUM 11
38
39/*
40 * These are used to set parameters in the core dumps.
41 */
42#define ELF_CLASS ELFCLASS32
43#define ELF_DATA ELFDATA2LSB
44#define ELF_ARCH EM_386
45
Thomas Gleixner96a388d2007-10-11 11:20:03 +020046#else
Thomas Gleixner2439a792007-10-23 22:37:23 +020047
48/* x86-64 relocation types */
49#define R_X86_64_NONE 0 /* No reloc */
50#define R_X86_64_64 1 /* Direct 64 bit */
51#define R_X86_64_PC32 2 /* PC relative 32 bit signed */
52#define R_X86_64_GOT32 3 /* 32 bit GOT entry */
53#define R_X86_64_PLT32 4 /* 32 bit PLT address */
54#define R_X86_64_COPY 5 /* Copy symbol at runtime */
55#define R_X86_64_GLOB_DAT 6 /* Create GOT entry */
56#define R_X86_64_JUMP_SLOT 7 /* Create PLT entry */
57#define R_X86_64_RELATIVE 8 /* Adjust by program base */
58#define R_X86_64_GOTPCREL 9 /* 32 bit signed pc relative
59 offset to GOT */
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 */
Ard Biesheuvelb40a1422018-09-18 23:51:39 -070066#define R_X86_64_PC64 24 /* Place relative 64-bit signed */
Thomas Gleixner2439a792007-10-23 22:37:23 +020067
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
Roland McGratha97f52e2008-01-30 13:31:55 +010077#include <asm/vdso.h>
78
Andy Lutomirski3d7ee962014-05-05 12:19:32 -070079#ifdef CONFIG_X86_64
80extern unsigned int vdso64_enabled;
81#endif
Brian Gerstab8b82ee62015-06-22 07:55:15 -040082#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
Andy Lutomirski3d7ee962014-05-05 12:19:32 -070083extern unsigned int vdso32_enabled;
84#endif
Thomas Gleixner2439a792007-10-23 22:37:23 +020085
Roland McGrathaf65d642008-01-30 13:30:43 +010086/*
87 * This is used to ensure we don't load something for the wrong architecture.
88 */
89#define elf_check_arch_ia32(x) \
90 (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
91
Thomas Gleixner2439a792007-10-23 22:37:23 +020092#include <asm/processor.h>
Joe Perchese40c0fe2008-03-09 12:35:00 -070093
94#ifdef CONFIG_X86_32
Thomas Gleixner2439a792007-10-23 22:37:23 +020095#include <asm/desc.h>
96
Roland McGrathaf65d642008-01-30 13:30:43 +010097#define elf_check_arch(x) elf_check_arch_ia32(x)
Thomas Gleixner2439a792007-10-23 22:37:23 +020098
99/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
100 contains a pointer to a function which might be registered using `atexit'.
101 This provides a mean for the dynamic linker to call DT_FINI functions for
102 shared libraries that have been loaded before the code runs.
103
104 A value of 0 tells we have no such handler.
105
106 We might as well make sure everything else is cleared too (except for %esp),
107 just to make things more deterministic.
108 */
Joe Perches486386f62008-03-23 01:02:08 -0700109#define ELF_PLAT_INIT(_r, load_addr) \
110 do { \
111 _r->bx = 0; _r->cx = 0; _r->dx = 0; \
112 _r->si = 0; _r->di = 0; _r->bp = 0; \
113 _r->ax = 0; \
Thomas Gleixner2439a792007-10-23 22:37:23 +0200114} while (0)
115
Hiroshi Shimamoto06495472008-01-30 13:33:16 +0100116/*
117 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
118 * now struct_user_regs, they are different)
119 */
120
Tejun Heoccbeed32009-02-09 22:17:40 +0900121#define ELF_CORE_COPY_REGS_COMMON(pr_reg, regs) \
Joe Perches486386f62008-03-23 01:02:08 -0700122do { \
123 pr_reg[0] = regs->bx; \
124 pr_reg[1] = regs->cx; \
125 pr_reg[2] = regs->dx; \
126 pr_reg[3] = regs->si; \
127 pr_reg[4] = regs->di; \
128 pr_reg[5] = regs->bp; \
129 pr_reg[6] = regs->ax; \
Andy Lutomirski99504812017-07-28 06:00:32 -0700130 pr_reg[7] = regs->ds; \
131 pr_reg[8] = regs->es; \
132 pr_reg[9] = regs->fs; \
Joe Perches486386f62008-03-23 01:02:08 -0700133 pr_reg[11] = regs->orig_ax; \
134 pr_reg[12] = regs->ip; \
Andy Lutomirski99504812017-07-28 06:00:32 -0700135 pr_reg[13] = regs->cs; \
Joe Perches486386f62008-03-23 01:02:08 -0700136 pr_reg[14] = regs->flags; \
137 pr_reg[15] = regs->sp; \
Andy Lutomirski99504812017-07-28 06:00:32 -0700138 pr_reg[16] = regs->ss; \
Hiroshi Shimamoto06495472008-01-30 13:33:16 +0100139} while (0);
140
Tejun Heoccbeed32009-02-09 22:17:40 +0900141#define ELF_CORE_COPY_REGS(pr_reg, regs) \
142do { \
143 ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
144 pr_reg[10] = get_user_gs(regs); \
145} while (0);
146
147#define ELF_CORE_COPY_KERNEL_REGS(pr_reg, regs) \
148do { \
149 ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
150 savesegment(gs, pr_reg[10]); \
151} while (0);
152
Thomas Gleixner2439a792007-10-23 22:37:23 +0200153#define ELF_PLATFORM (utsname()->machine)
154#define set_personality_64bit() do { } while (0)
Thomas Gleixner2439a792007-10-23 22:37:23 +0200155
156#else /* CONFIG_X86_32 */
157
Thomas Gleixner2439a792007-10-23 22:37:23 +0200158/*
159 * This is used to ensure we don't load something for the wrong architecture.
160 */
Joe Perches486386f62008-03-23 01:02:08 -0700161#define elf_check_arch(x) \
Thomas Gleixner2439a792007-10-23 22:37:23 +0200162 ((x)->e_machine == EM_X86_64)
163
Ben Hutchings0e6d3112014-09-07 21:05:05 +0100164#define compat_elf_check_arch(x) \
165 (elf_check_arch_ia32(x) || \
166 (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64))
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800167
168#if __USER32_DS != __USER_DS
169# error "The following code assumes __USER32_DS == __USER_DS"
170#endif
Roland McGratha97f52e2008-01-30 13:31:55 +0100171
Roland McGratha97f52e2008-01-30 13:31:55 +0100172static inline void elf_common_init(struct thread_struct *t,
173 struct pt_regs *regs, const u16 ds)
174{
Andy Lutomirski7bcdea42015-10-05 17:48:00 -0700175 /* ax gets execve's return value. */
176 /*regs->ax = */ regs->bx = regs->cx = regs->dx = 0;
177 regs->si = regs->di = regs->bp = 0;
Roland McGratha97f52e2008-01-30 13:31:55 +0100178 regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
Andy Lutomirski7bcdea42015-10-05 17:48:00 -0700179 regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
Andy Lutomirski296f7812016-04-26 12:23:29 -0700180 t->fsbase = t->gsbase = 0;
Roland McGratha97f52e2008-01-30 13:31:55 +0100181 t->fsindex = t->gsindex = 0;
182 t->ds = t->es = ds;
183}
184
Joe Perches486386f62008-03-23 01:02:08 -0700185#define ELF_PLAT_INIT(_r, load_addr) \
Oleg Nesterov11557b22010-02-16 15:24:01 +0100186 elf_common_init(&current->thread, _r, 0)
Thomas Gleixner2439a792007-10-23 22:37:23 +0200187
Joe Perches486386f62008-03-23 01:02:08 -0700188#define COMPAT_ELF_PLAT_INIT(regs, load_addr) \
Roland McGratha97f52e2008-01-30 13:31:55 +0100189 elf_common_init(&current->thread, regs, __USER_DS)
Joe Perches486386f62008-03-23 01:02:08 -0700190
Brian Gerst7da77072015-06-22 07:55:13 -0400191void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp);
192#define compat_start_thread compat_start_thread
Joe Perches486386f62008-03-23 01:02:08 -0700193
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800194void set_personality_ia32(bool);
195#define COMPAT_SET_PERSONALITY(ex) \
196 set_personality_ia32((ex).e_machine == EM_X86_64)
Joe Perches486386f62008-03-23 01:02:08 -0700197
Roland McGratha97f52e2008-01-30 13:31:55 +0100198#define COMPAT_ELF_PLATFORM ("i686")
199
Hiroshi Shimamoto06495472008-01-30 13:33:16 +0100200/*
201 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
202 * now struct_user_regs, they are different). Assumes current is the process
203 * getting dumped.
204 */
205
Joe Perches486386f62008-03-23 01:02:08 -0700206#define ELF_CORE_COPY_REGS(pr_reg, regs) \
207do { \
Hiroshi Shimamoto06495472008-01-30 13:33:16 +0100208 unsigned v; \
209 (pr_reg)[0] = (regs)->r15; \
210 (pr_reg)[1] = (regs)->r14; \
211 (pr_reg)[2] = (regs)->r13; \
212 (pr_reg)[3] = (regs)->r12; \
213 (pr_reg)[4] = (regs)->bp; \
214 (pr_reg)[5] = (regs)->bx; \
215 (pr_reg)[6] = (regs)->r11; \
216 (pr_reg)[7] = (regs)->r10; \
217 (pr_reg)[8] = (regs)->r9; \
218 (pr_reg)[9] = (regs)->r8; \
219 (pr_reg)[10] = (regs)->ax; \
220 (pr_reg)[11] = (regs)->cx; \
221 (pr_reg)[12] = (regs)->dx; \
222 (pr_reg)[13] = (regs)->si; \
223 (pr_reg)[14] = (regs)->di; \
224 (pr_reg)[15] = (regs)->orig_ax; \
225 (pr_reg)[16] = (regs)->ip; \
226 (pr_reg)[17] = (regs)->cs; \
227 (pr_reg)[18] = (regs)->flags; \
228 (pr_reg)[19] = (regs)->sp; \
229 (pr_reg)[20] = (regs)->ss; \
Chang S. Bae824eea32018-09-18 16:08:55 -0700230 (pr_reg)[21] = x86_fsbase_read_cpu(); \
231 (pr_reg)[22] = x86_gsbase_read_cpu_inactive(); \
Hiroshi Shimamoto06495472008-01-30 13:33:16 +0100232 asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v; \
233 asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v; \
234 asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v; \
235 asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v; \
236} while (0);
237
Thomas Gleixner2439a792007-10-23 22:37:23 +0200238/* I'm not sure if we can use '-' here */
239#define ELF_PLATFORM ("x86_64")
240extern void set_personality_64bit(void);
Roland McGratha97f52e2008-01-30 13:31:55 +0100241extern unsigned int sysctl_vsyscall32;
242extern int force_personality32;
Thomas Gleixner2439a792007-10-23 22:37:23 +0200243
244#endif /* !CONFIG_X86_32 */
245
Roland McGrath975511b2008-01-30 13:31:54 +0100246#define CORE_DUMP_USE_REGSET
Thomas Gleixner2439a792007-10-23 22:37:23 +0200247#define ELF_EXEC_PAGESIZE 4096
248
Kees Cookeab09532017-07-10 15:52:37 -0700249/*
250 * This is the base location for PIE (ET_DYN with INTERP) loads. On
Kees Cookc715b722017-08-18 15:16:31 -0700251 * 64-bit, this is above 4GB to leave the entire 32-bit address
Kees Cookeab09532017-07-10 15:52:37 -0700252 * space open for things that want to use the area for 32-bit pointers.
253 */
254#define ELF_ET_DYN_BASE (mmap_is_ia32() ? 0x000400000UL : \
Kirill A. Shutemovbe739f42017-11-07 13:38:04 +0300255 (DEFAULT_MAP_WINDOW / 3 * 2))
Thomas Gleixner2439a792007-10-23 22:37:23 +0200256
257/* This yields a mask that user programs can use to figure out what
258 instruction set this CPU supports. This could be done in user space,
259 but it's not easy, and we've already done it here. */
260
Huaitong Han16aaa532016-01-25 20:41:47 +0100261#define ELF_HWCAP (boot_cpu_data.x86_capability[CPUID_1_EDX])
Thomas Gleixner2439a792007-10-23 22:37:23 +0200262
Grzegorz Andrejczuk0274f952017-01-20 14:22:34 +0100263extern u32 elf_hwcap2;
264
265/*
266 * HWCAP2 supplies mask with kernel enabled CPU features, so that
267 * the application can discover that it can safely use them.
268 * The bits are defined in uapi/asm/hwcap2.h.
269 */
270#define ELF_HWCAP2 (elf_hwcap2)
271
Thomas Gleixner2439a792007-10-23 22:37:23 +0200272/* This yields a string that ld.so will use to load implementation
273 specific libraries for optimization. This is more specific in
274 intent than poking at uname or /proc/cpuinfo.
275
276 For the moment, we have only optimizations for the Intel generations,
277 but that could change... */
278
Martin Schwidefsky0b592682008-10-16 15:39:57 +0200279#define SET_PERSONALITY(ex) set_personality_64bit()
Thomas Gleixner2439a792007-10-23 22:37:23 +0200280
281/*
282 * An executable for which elf_read_implies_exec() returns TRUE will
283 * have the READ_IMPLIES_EXEC personality flag set automatically.
284 */
285#define elf_read_implies_exec(ex, executable_stack) \
286 (executable_stack != EXSTACK_DISABLE_X)
287
288struct task_struct;
289
Andy Lutomirski3d7ee962014-05-05 12:19:32 -0700290#define ARCH_DLINFO_IA32 \
Joe Perches486386f62008-03-23 01:02:08 -0700291do { \
Thomas Gleixner6fdc6dd2017-04-10 17:14:28 +0200292 if (VDSO_CURRENT_BASE) { \
Thomas Gleixner2439a792007-10-23 22:37:23 +0200293 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \
294 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \
Joe Perches486386f62008-03-23 01:02:08 -0700295 } \
Thomas Gleixner2439a792007-10-23 22:37:23 +0200296} while (0)
297
Dmitry Safonov8f3e4742017-03-06 17:17:18 +0300298/*
299 * True on X86_32 or when emulating IA32 on X86_64
300 */
301static inline int mmap_is_ia32(void)
302{
303 return IS_ENABLED(CONFIG_X86_32) ||
304 (IS_ENABLED(CONFIG_COMPAT) &&
305 test_thread_flag(TIF_ADDR32));
306}
307
Kirill A. Shutemove8f01a82017-07-17 01:59:50 +0300308extern unsigned long task_size_32bit(void);
Kirill A. Shutemovb569bab2017-07-17 01:59:52 +0300309extern unsigned long task_size_64bit(int full_addr_space);
Dmitry Safonove13b73d2017-03-14 14:41:26 +0300310extern unsigned long get_mmap_base(int is_legacy);
Kirill A. Shutemov1e0f25d2017-11-15 17:36:06 +0300311extern bool mmap_address_hint_valid(unsigned long addr, unsigned long len);
Dmitry Safonov1b028f72017-03-06 17:17:19 +0300312
Roland McGratha97f52e2008-01-30 13:31:55 +0100313#ifdef CONFIG_X86_32
314
Dmitry Safonov8f3e4742017-03-06 17:17:18 +0300315#define __STACK_RND_MASK(is32bit) (0x7ff)
Michal Hocko80938332009-09-08 11:01:55 +0200316#define STACK_RND_MASK (0x7ff)
317
Andy Lutomirski3d7ee962014-05-05 12:19:32 -0700318#define ARCH_DLINFO ARCH_DLINFO_IA32
Roland McGratha97f52e2008-01-30 13:31:55 +0100319
320/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
321
Thomas Gleixner2439a792007-10-23 22:37:23 +0200322#else /* CONFIG_X86_32 */
323
324/* 1GB for 64bit, 8MB for 32bit */
Dmitry Safonov8f3e4742017-03-06 17:17:18 +0300325#define __STACK_RND_MASK(is32bit) ((is32bit) ? 0x7ff : 0x3fffff)
326#define STACK_RND_MASK __STACK_RND_MASK(mmap_is_ia32())
Thomas Gleixner2439a792007-10-23 22:37:23 +0200327
Joe Perches486386f62008-03-23 01:02:08 -0700328#define ARCH_DLINFO \
329do { \
Andy Lutomirski3d7ee962014-05-05 12:19:32 -0700330 if (vdso64_enabled) \
Joe Perches486386f62008-03-23 01:02:08 -0700331 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
Andy Lutomirski6f121e52014-05-05 12:19:34 -0700332 (unsigned long __force)current->mm->context.vdso); \
Thomas Gleixner2439a792007-10-23 22:37:23 +0200333} while (0)
334
Andy Lutomirski3d7ee962014-05-05 12:19:32 -0700335/* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800336#define ARCH_DLINFO_X32 \
337do { \
Andy Lutomirski3d7ee962014-05-05 12:19:32 -0700338 if (vdso64_enabled) \
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800339 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
Andy Lutomirski6f121e52014-05-05 12:19:34 -0700340 (unsigned long __force)current->mm->context.vdso); \
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800341} while (0)
342
Roland McGratha97f52e2008-01-30 13:31:55 +0100343#define AT_SYSINFO 32
344
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800345#define COMPAT_ARCH_DLINFO \
346if (test_thread_flag(TIF_X32)) \
347 ARCH_DLINFO_X32; \
348else \
Andy Lutomirski3d7ee962014-05-05 12:19:32 -0700349 ARCH_DLINFO_IA32
Roland McGratha97f52e2008-01-30 13:31:55 +0100350
351#define COMPAT_ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000)
352
Thomas Gleixner2439a792007-10-23 22:37:23 +0200353#endif /* !CONFIG_X86_32 */
354
Roland McGrathaf65d642008-01-30 13:30:43 +0100355#define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso)
356
Joe Perches486386f62008-03-23 01:02:08 -0700357#define VDSO_ENTRY \
Andy Lutomirski6f121e52014-05-05 12:19:34 -0700358 ((unsigned long)current->mm->context.vdso + \
Andy Lutomirski0a6d1fa2015-10-05 17:47:56 -0700359 vdso_image_32.sym___kernel_vsyscall)
Roland McGrathaf65d642008-01-30 13:30:43 +0100360
Thomas Gleixner2439a792007-10-23 22:37:23 +0200361struct linux_binprm;
362
363#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
364extern int arch_setup_additional_pages(struct linux_binprm *bprm,
Martin Schwidefskyfc5243d2008-12-25 13:38:35 +0100365 int uses_interp);
Andy Lutomirski18d0a6f2014-05-05 12:19:35 -0700366extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
367 int uses_interp);
368#define compat_arch_setup_additional_pages compat_arch_setup_additional_pages
Roland McGratha97f52e2008-01-30 13:31:55 +0100369
Michel Lespinassef99024722012-12-11 16:01:52 -0800370/* Do not change the values. See get_align_mask() */
Borislav Petkovdfb09f92011-08-05 15:15:08 +0200371enum align_flags {
372 ALIGN_VA_32 = BIT(0),
373 ALIGN_VA_64 = BIT(1),
Borislav Petkovdfb09f92011-08-05 15:15:08 +0200374};
375
376struct va_alignment {
377 int flags;
378 unsigned long mask;
Hector Marco-Gisbert4e26d11f2015-03-27 12:38:21 +0100379 unsigned long bits;
Borislav Petkovdfb09f92011-08-05 15:15:08 +0200380} ____cacheline_aligned;
381
382extern struct va_alignment va_align;
Michel Lespinassef99024722012-12-11 16:01:52 -0800383extern unsigned long align_vdso_addr(unsigned long);
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700384#endif /* _ASM_X86_ELF_H */