source: src/linux/universal/linux-3.18/arch/x86/include/asm/elf.h @ 31885

Last change on this file since 31885 was 31885, checked in by brainslayer, 5 weeks ago

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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
13typedef unsigned long elf_greg_t;
14
15#define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
16typedef elf_greg_t elf_gregset_t[ELF_NGREG];
17
18typedef struct user_i387_struct elf_fpregset_t;
19
20#ifdef __i386__
21
22typedef 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#ifdef CONFIG_X86_64
79extern unsigned int vdso64_enabled;
80#endif
81#if defined(CONFIG_X86_32) || defined(CONFIG_COMPAT)
82extern unsigned int vdso32_enabled;
83#endif
84
85/*
86 * This is used to ensure we don't load something for the wrong architecture.
87 */
88#define elf_check_arch_ia32(x) \
89        (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
90
91#include <asm/processor.h>
92
93#ifdef CONFIG_X86_32
94#include <asm/desc.h>
95
96#define elf_check_arch(x)       elf_check_arch_ia32(x)
97
98/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
99   contains a pointer to a function which might be registered using `atexit'.
100   This provides a mean for the dynamic linker to call DT_FINI functions for
101   shared libraries that have been loaded before the code runs.
102
103   A value of 0 tells we have no such handler.
104
105   We might as well make sure everything else is cleared too (except for %esp),
106   just to make things more deterministic.
107 */
108#define ELF_PLAT_INIT(_r, load_addr)            \
109        do {                                    \
110        _r->bx = 0; _r->cx = 0; _r->dx = 0;     \
111        _r->si = 0; _r->di = 0; _r->bp = 0;     \
112        _r->ax = 0;                             \
113} while (0)
114
115/*
116 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
117 * now struct_user_regs, they are different)
118 */
119
120#define ELF_CORE_COPY_REGS_COMMON(pr_reg, regs) \
121do {                                            \
122        pr_reg[0] = regs->bx;                   \
123        pr_reg[1] = regs->cx;                   \
124        pr_reg[2] = regs->dx;                   \
125        pr_reg[3] = regs->si;                   \
126        pr_reg[4] = regs->di;                   \
127        pr_reg[5] = regs->bp;                   \
128        pr_reg[6] = regs->ax;                   \
129        pr_reg[7] = regs->ds & 0xffff;          \
130        pr_reg[8] = regs->es & 0xffff;          \
131        pr_reg[9] = regs->fs & 0xffff;          \
132        pr_reg[11] = regs->orig_ax;             \
133        pr_reg[12] = regs->ip;                  \
134        pr_reg[13] = regs->cs & 0xffff;         \
135        pr_reg[14] = regs->flags;               \
136        pr_reg[15] = regs->sp;                  \
137        pr_reg[16] = regs->ss & 0xffff;         \
138} while (0);
139
140#define ELF_CORE_COPY_REGS(pr_reg, regs)        \
141do {                                            \
142        ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
143        pr_reg[10] = get_user_gs(regs);         \
144} while (0);
145
146#define ELF_CORE_COPY_KERNEL_REGS(pr_reg, regs) \
147do {                                            \
148        ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
149        savesegment(gs, pr_reg[10]);            \
150} while (0);
151
152#define ELF_PLATFORM    (utsname()->machine)
153#define set_personality_64bit() do { } while (0)
154
155#else /* CONFIG_X86_32 */
156
157/*
158 * This is used to ensure we don't load something for the wrong architecture.
159 */
160#define elf_check_arch(x)                       \
161        ((x)->e_machine == EM_X86_64)
162
163#define compat_elf_check_arch(x)                                        \
164        (elf_check_arch_ia32(x) ||                                      \
165         (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64))
166
167#if __USER32_DS != __USER_DS
168# error "The following code assumes __USER32_DS == __USER_DS"
169#endif
170
171static inline void elf_common_init(struct thread_struct *t,
172                                   struct pt_regs *regs, const u16 ds)
173{
174        regs->ax = regs->bx = regs->cx = regs->dx = 0;
175        regs->si = regs->di = regs->bp = 0;
176        regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
177        regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
178        t->fs = t->gs = 0;
179        t->fsindex = t->gsindex = 0;
180        t->ds = t->es = ds;
181}
182
183#define ELF_PLAT_INIT(_r, load_addr)                    \
184        elf_common_init(&current->thread, _r, 0)
185
186#define COMPAT_ELF_PLAT_INIT(regs, load_addr)           \
187        elf_common_init(&current->thread, regs, __USER_DS)
188
189void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp);
190#define compat_start_thread start_thread_ia32
191
192void set_personality_ia32(bool);
193#define COMPAT_SET_PERSONALITY(ex)                      \
194        set_personality_ia32((ex).e_machine == EM_X86_64)
195
196#define COMPAT_ELF_PLATFORM                     ("i686")
197
198/*
199 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
200 * now struct_user_regs, they are different). Assumes current is the process
201 * getting dumped.
202 */
203
204#define ELF_CORE_COPY_REGS(pr_reg, regs)                        \
205do {                                                            \
206        unsigned v;                                             \
207        (pr_reg)[0] = (regs)->r15;                              \
208        (pr_reg)[1] = (regs)->r14;                              \
209        (pr_reg)[2] = (regs)->r13;                              \
210        (pr_reg)[3] = (regs)->r12;                              \
211        (pr_reg)[4] = (regs)->bp;                               \
212        (pr_reg)[5] = (regs)->bx;                               \
213        (pr_reg)[6] = (regs)->r11;                              \
214        (pr_reg)[7] = (regs)->r10;                              \
215        (pr_reg)[8] = (regs)->r9;                               \
216        (pr_reg)[9] = (regs)->r8;                               \
217        (pr_reg)[10] = (regs)->ax;                              \
218        (pr_reg)[11] = (regs)->cx;                              \
219        (pr_reg)[12] = (regs)->dx;                              \
220        (pr_reg)[13] = (regs)->si;                              \
221        (pr_reg)[14] = (regs)->di;                              \
222        (pr_reg)[15] = (regs)->orig_ax;                         \
223        (pr_reg)[16] = (regs)->ip;                              \
224        (pr_reg)[17] = (regs)->cs;                              \
225        (pr_reg)[18] = (regs)->flags;                           \
226        (pr_reg)[19] = (regs)->sp;                              \
227        (pr_reg)[20] = (regs)->ss;                              \
228        (pr_reg)[21] = current->thread.fs;                      \
229        (pr_reg)[22] = current->thread.gs;                      \
230        asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
231        asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
232        asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
233        asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
234} while (0);
235
236/* I'm not sure if we can use '-' here */
237#define ELF_PLATFORM       ("x86_64")
238extern void set_personality_64bit(void);
239extern unsigned int sysctl_vsyscall32;
240extern int force_personality32;
241
242#endif /* !CONFIG_X86_32 */
243
244#define CORE_DUMP_USE_REGSET
245#define ELF_EXEC_PAGESIZE       4096
246
247/* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
248   use of this is to invoke "./ld.so someprog" to test out a new version of
249   the loader.  We need to make sure that it is out of the way of the program
250   that it will "exec", and that there is sufficient room for the brk.  */
251
252#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
253
254/* This yields a mask that user programs can use to figure out what
255   instruction set this CPU supports.  This could be done in user space,
256   but it's not easy, and we've already done it here.  */
257
258#define ELF_HWCAP               (boot_cpu_data.x86_capability[0])
259
260/* This yields a string that ld.so will use to load implementation
261   specific libraries for optimization.  This is more specific in
262   intent than poking at uname or /proc/cpuinfo.
263
264   For the moment, we have only optimizations for the Intel generations,
265   but that could change... */
266
267#define SET_PERSONALITY(ex) set_personality_64bit()
268
269/*
270 * An executable for which elf_read_implies_exec() returns TRUE will
271 * have the READ_IMPLIES_EXEC personality flag set automatically.
272 */
273#define elf_read_implies_exec(ex, executable_stack)     \
274        (executable_stack != EXSTACK_DISABLE_X)
275
276struct task_struct;
277
278#define ARCH_DLINFO_IA32                                                \
279do {                                                                    \
280        if (VDSO_CURRENT_BASE) {                                        \
281                NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
282                NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
283        }                                                               \
284} while (0)
285
286#ifdef CONFIG_X86_32
287
288#define STACK_RND_MASK (0x7ff)
289
290#define ARCH_DLINFO             ARCH_DLINFO_IA32
291
292/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
293
294#else /* CONFIG_X86_32 */
295
296/* 1GB for 64bit, 8MB for 32bit */
297#define STACK_RND_MASK (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff)
298
299#define ARCH_DLINFO                                                     \
300do {                                                                    \
301        if (vdso64_enabled)                                             \
302                NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
303                            (unsigned long __force)current->mm->context.vdso); \
304} while (0)
305
306/* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */
307#define ARCH_DLINFO_X32                                                 \
308do {                                                                    \
309        if (vdso64_enabled)                                             \
310                NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
311                            (unsigned long __force)current->mm->context.vdso); \
312} while (0)
313
314#define AT_SYSINFO              32
315
316#define COMPAT_ARCH_DLINFO                                              \
317if (test_thread_flag(TIF_X32))                                          \
318        ARCH_DLINFO_X32;                                                \
319else                                                                    \
320        ARCH_DLINFO_IA32
321
322#define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
323
324#endif /* !CONFIG_X86_32 */
325
326#define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
327
328#define VDSO_ENTRY                                                      \
329        ((unsigned long)current->mm->context.vdso +                     \
330         selected_vdso32->sym___kernel_vsyscall)
331
332struct linux_binprm;
333
334#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
335extern int arch_setup_additional_pages(struct linux_binprm *bprm,
336                                       int uses_interp);
337extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
338                                              int uses_interp);
339#define compat_arch_setup_additional_pages compat_arch_setup_additional_pages
340
341extern unsigned long arch_randomize_brk(struct mm_struct *mm);
342#define arch_randomize_brk arch_randomize_brk
343
344/*
345 * True on X86_32 or when emulating IA32 on X86_64
346 */
347static inline int mmap_is_ia32(void)
348{
349#ifdef CONFIG_X86_32
350        return 1;
351#endif
352#ifdef CONFIG_IA32_EMULATION
353        if (test_thread_flag(TIF_ADDR32))
354                return 1;
355#endif
356        return 0;
357}
358
359/* Do not change the values. See get_align_mask() */
360enum align_flags {
361        ALIGN_VA_32     = BIT(0),
362        ALIGN_VA_64     = BIT(1),
363};
364
365struct va_alignment {
366        int flags;
367        unsigned long mask;
368} ____cacheline_aligned;
369
370extern struct va_alignment va_align;
371extern unsigned long align_vdso_addr(unsigned long);
372#endif /* _ASM_X86_ELF_H */
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