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TOMOYO Linux Cross Reference
Linux/arch/x86/include/asm/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 /* Do not change the values. See get_align_mask() */
358 enum align_flags {
359         ALIGN_VA_32     = BIT(0),
360         ALIGN_VA_64     = BIT(1),
361 };
362 
363 struct va_alignment {
364         int flags;
365         unsigned long mask;
366 } ____cacheline_aligned;
367 
368 extern struct va_alignment va_align;
369 extern unsigned long align_vdso_addr(unsigned long);
370 #endif /* _ASM_X86_ELF_H */
371 

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