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elf.h
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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 
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 
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(&current->thread, _r, 0)
179 
180 #define COMPAT_ELF_PLAT_INIT(regs, load_addr) \
181  elf_common_init(&current->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  */
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 */
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