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
13 typedef unsigned long elf_greg_t;
14
15 #define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
16 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
17
18 typedef struct user_i387_struct elf_fpregset_t;
19
20 #ifdef __i386__
21
22 typedef 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 extern unsigned int vdso_enabled;
79
80 /*
81 * This is used to ensure we don't load something for the wrong architecture.
82 */
83 #define elf_check_arch_ia32(x) \
84 (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
85
86 #include <asm/processor.h>
87
88 #ifdef CONFIG_X86_32
89 #include <asm/desc.h>
90
91 #define elf_check_arch(x) elf_check_arch_ia32(x)
92
93 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
94 contains a pointer to a function which might be registered using `atexit'.
95 This provides a mean for the dynamic linker to call DT_FINI functions for
96 shared libraries that have been loaded before the code runs.
97
98 A value of 0 tells we have no such handler.
99
100 We might as well make sure everything else is cleared too (except for %esp),
101 just to make things more deterministic.
102 */
103 #define ELF_PLAT_INIT(_r, load_addr) \
104 do { \
105 _r->bx = 0; _r->cx = 0; _r->dx = 0; \
106 _r->si = 0; _r->di = 0; _r->bp = 0; \
107 _r->ax = 0; \
108 } while (0)
109
110 /*
111 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
112 * now struct_user_regs, they are different)
113 */
114
115 #define ELF_CORE_COPY_REGS_COMMON(pr_reg, regs) \
116 do { \
117 pr_reg[0] = regs->bx; \
118 pr_reg[1] = regs->cx; \
119 pr_reg[2] = regs->dx; \
120 pr_reg[3] = regs->si; \
121 pr_reg[4] = regs->di; \
122 pr_reg[5] = regs->bp; \
123 pr_reg[6] = regs->ax; \
124 pr_reg[7] = regs->ds & 0xffff; \
125 pr_reg[8] = regs->es & 0xffff; \
126 pr_reg[9] = regs->fs & 0xffff; \
127 pr_reg[11] = regs->orig_ax; \
128 pr_reg[12] = regs->ip; \
129 pr_reg[13] = regs->cs & 0xffff; \
130 pr_reg[14] = regs->flags; \
131 pr_reg[15] = regs->sp; \
132 pr_reg[16] = regs->ss & 0xffff; \
133 } while (0);
134
135 #define ELF_CORE_COPY_REGS(pr_reg, regs) \
136 do { \
137 ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
138 pr_reg[10] = get_user_gs(regs); \
139 } while (0);
140
141 #define ELF_CORE_COPY_KERNEL_REGS(pr_reg, regs) \
142 do { \
143 ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
144 savesegment(gs, pr_reg[10]); \
145 } while (0);
146
147 #define ELF_PLATFORM (utsname()->machine)
148 #define set_personality_64bit() do { } while (0)
149
150 #else /* CONFIG_X86_32 */
151
152 /*
153 * This is used to ensure we don't load something for the wrong architecture.
154 */
155 #define elf_check_arch(x) \
156 ((x)->e_machine == EM_X86_64)
157
158 #define compat_elf_check_arch(x) \
159 (elf_check_arch_ia32(x) || (x)->e_machine == EM_X86_64)
160
161 #if __USER32_DS != __USER_DS
162 # error "The following code assumes __USER32_DS == __USER_DS"
163 #endif
164
elf_common_init(struct thread_struct * t,struct pt_regs * regs,const u16 ds)165 static inline void elf_common_init(struct thread_struct *t,
166 struct pt_regs *regs, const u16 ds)
167 {
168 regs->ax = regs->bx = regs->cx = regs->dx = 0;
169 regs->si = regs->di = regs->bp = 0;
170 regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
171 regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
172 t->fs = t->gs = 0;
173 t->fsindex = t->gsindex = 0;
174 t->ds = t->es = ds;
175 }
176
177 #define ELF_PLAT_INIT(_r, load_addr) \
178 elf_common_init(¤t->thread, _r, 0)
179
180 #define COMPAT_ELF_PLAT_INIT(regs, load_addr) \
181 elf_common_init(¤t->thread, regs, __USER_DS)
182
183 void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp);
184 #define compat_start_thread start_thread_ia32
185
186 void set_personality_ia32(bool);
187 #define COMPAT_SET_PERSONALITY(ex) \
188 set_personality_ia32((ex).e_machine == EM_X86_64)
189
190 #define COMPAT_ELF_PLATFORM ("i686")
191
192 /*
193 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
194 * now struct_user_regs, they are different). Assumes current is the process
195 * getting dumped.
196 */
197
198 #define ELF_CORE_COPY_REGS(pr_reg, regs) \
199 do { \
200 unsigned v; \
201 (pr_reg)[0] = (regs)->r15; \
202 (pr_reg)[1] = (regs)->r14; \
203 (pr_reg)[2] = (regs)->r13; \
204 (pr_reg)[3] = (regs)->r12; \
205 (pr_reg)[4] = (regs)->bp; \
206 (pr_reg)[5] = (regs)->bx; \
207 (pr_reg)[6] = (regs)->r11; \
208 (pr_reg)[7] = (regs)->r10; \
209 (pr_reg)[8] = (regs)->r9; \
210 (pr_reg)[9] = (regs)->r8; \
211 (pr_reg)[10] = (regs)->ax; \
212 (pr_reg)[11] = (regs)->cx; \
213 (pr_reg)[12] = (regs)->dx; \
214 (pr_reg)[13] = (regs)->si; \
215 (pr_reg)[14] = (regs)->di; \
216 (pr_reg)[15] = (regs)->orig_ax; \
217 (pr_reg)[16] = (regs)->ip; \
218 (pr_reg)[17] = (regs)->cs; \
219 (pr_reg)[18] = (regs)->flags; \
220 (pr_reg)[19] = (regs)->sp; \
221 (pr_reg)[20] = (regs)->ss; \
222 (pr_reg)[21] = current->thread.fs; \
223 (pr_reg)[22] = current->thread.gs; \
224 asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v; \
225 asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v; \
226 asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v; \
227 asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v; \
228 } while (0);
229
230 /* I'm not sure if we can use '-' here */
231 #define ELF_PLATFORM ("x86_64")
232 extern void set_personality_64bit(void);
233 extern unsigned int sysctl_vsyscall32;
234 extern int force_personality32;
235
236 #endif /* !CONFIG_X86_32 */
237
238 #define CORE_DUMP_USE_REGSET
239 #define ELF_EXEC_PAGESIZE 4096
240
241 /* This is the location that an ET_DYN program is loaded if exec'ed. Typical
242 use of this is to invoke "./ld.so someprog" to test out a new version of
243 the loader. We need to make sure that it is out of the way of the program
244 that it will "exec", and that there is sufficient room for the brk. */
245
246 #define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
247
248 /* This yields a mask that user programs can use to figure out what
249 instruction set this CPU supports. This could be done in user space,
250 but it's not easy, and we've already done it here. */
251
252 #define ELF_HWCAP (boot_cpu_data.x86_capability[0])
253
254 /* This yields a string that ld.so will use to load implementation
255 specific libraries for optimization. This is more specific in
256 intent than poking at uname or /proc/cpuinfo.
257
258 For the moment, we have only optimizations for the Intel generations,
259 but that could change... */
260
261 #define SET_PERSONALITY(ex) set_personality_64bit()
262
263 /*
264 * An executable for which elf_read_implies_exec() returns TRUE will
265 * have the READ_IMPLIES_EXEC personality flag set automatically.
266 */
267 #define elf_read_implies_exec(ex, executable_stack) \
268 (executable_stack != EXSTACK_DISABLE_X)
269
270 struct task_struct;
271
272 #define ARCH_DLINFO_IA32(vdso_enabled) \
273 do { \
274 if (vdso_enabled) { \
275 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \
276 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \
277 } \
278 } while (0)
279
280 #ifdef CONFIG_X86_32
281
282 #define STACK_RND_MASK (0x7ff)
283
284 #define VDSO_HIGH_BASE (__fix_to_virt(FIX_VDSO))
285
286 #define ARCH_DLINFO ARCH_DLINFO_IA32(vdso_enabled)
287
288 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
289
290 #else /* CONFIG_X86_32 */
291
292 #define VDSO_HIGH_BASE 0xffffe000U /* CONFIG_COMPAT_VDSO address */
293
294 /* 1GB for 64bit, 8MB for 32bit */
295 #define STACK_RND_MASK (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff)
296
297 #define ARCH_DLINFO \
298 do { \
299 if (vdso_enabled) \
300 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
301 (unsigned long)current->mm->context.vdso); \
302 } while (0)
303
304 #define ARCH_DLINFO_X32 \
305 do { \
306 if (vdso_enabled) \
307 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
308 (unsigned long)current->mm->context.vdso); \
309 } while (0)
310
311 #define AT_SYSINFO 32
312
313 #define COMPAT_ARCH_DLINFO \
314 if (test_thread_flag(TIF_X32)) \
315 ARCH_DLINFO_X32; \
316 else \
317 ARCH_DLINFO_IA32(sysctl_vsyscall32)
318
319 #define COMPAT_ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000)
320
321 #endif /* !CONFIG_X86_32 */
322
323 #define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso)
324
325 #define VDSO_ENTRY \
326 ((unsigned long)VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall))
327
328 struct linux_binprm;
329
330 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
331 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
332 int uses_interp);
333 extern int x32_setup_additional_pages(struct linux_binprm *bprm,
334 int uses_interp);
335
336 extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
337 #define compat_arch_setup_additional_pages syscall32_setup_pages
338
339 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
340 #define arch_randomize_brk arch_randomize_brk
341
342 /*
343 * True on X86_32 or when emulating IA32 on X86_64
344 */
mmap_is_ia32(void)345 static inline int mmap_is_ia32(void)
346 {
347 #ifdef CONFIG_X86_32
348 return 1;
349 #endif
350 #ifdef CONFIG_IA32_EMULATION
351 if (test_thread_flag(TIF_ADDR32))
352 return 1;
353 #endif
354 return 0;
355 }
356
357 /* The first two values are special, do not change. See align_addr() */
358 enum align_flags {
359 ALIGN_VA_32 = BIT(0),
360 ALIGN_VA_64 = BIT(1),
361 ALIGN_VDSO = BIT(2),
362 ALIGN_TOPDOWN = BIT(3),
363 };
364
365 struct va_alignment {
366 int flags;
367 unsigned long mask;
368 } ____cacheline_aligned;
369
370 extern struct va_alignment va_align;
371 extern unsigned long align_addr(unsigned long, struct file *, enum align_flags);
372 #endif /* _ASM_X86_ELF_H */
373