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1 #ifndef _ASM_X86_ELF_H
2 #define _ASM_X86_ELF_H
3
4 /*
5  * ELF register definitions..
6  */
7
8 #include <asm/ptrace.h>
9 #include <asm/user.h>
10 #include <asm/auxvec.h>
11
12 typedef unsigned long elf_greg_t;
13
14 #define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
15 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
16
17 typedef struct user_i387_struct elf_fpregset_t;
18
19 #ifdef __i386__
20
21 typedef struct user_fxsr_struct elf_fpxregset_t;
22
23 #define R_386_NONE      0
24 #define R_386_32        1
25 #define R_386_PC32      2
26 #define R_386_GOT32     3
27 #define R_386_PLT32     4
28 #define R_386_COPY      5
29 #define R_386_GLOB_DAT  6
30 #define R_386_JMP_SLOT  7
31 #define R_386_RELATIVE  8
32 #define R_386_GOTOFF    9
33 #define R_386_GOTPC     10
34 #define R_386_NUM       11
35
36 /*
37  * These are used to set parameters in the core dumps.
38  */
39 #define ELF_CLASS       ELFCLASS32
40 #define ELF_DATA        ELFDATA2LSB
41 #define ELF_ARCH        EM_386
42
43 #else
44
45 /* x86-64 relocation types */
46 #define R_X86_64_NONE           0       /* No reloc */
47 #define R_X86_64_64             1       /* Direct 64 bit  */
48 #define R_X86_64_PC32           2       /* PC relative 32 bit signed */
49 #define R_X86_64_GOT32          3       /* 32 bit GOT entry */
50 #define R_X86_64_PLT32          4       /* 32 bit PLT address */
51 #define R_X86_64_COPY           5       /* Copy symbol at runtime */
52 #define R_X86_64_GLOB_DAT       6       /* Create GOT entry */
53 #define R_X86_64_JUMP_SLOT      7       /* Create PLT entry */
54 #define R_X86_64_RELATIVE       8       /* Adjust by program base */
55 #define R_X86_64_GOTPCREL       9       /* 32 bit signed pc relative
56                                            offset to GOT */
57 #define R_X86_64_32             10      /* Direct 32 bit zero extended */
58 #define R_X86_64_32S            11      /* Direct 32 bit sign extended */
59 #define R_X86_64_16             12      /* Direct 16 bit zero extended */
60 #define R_X86_64_PC16           13      /* 16 bit sign extended pc relative */
61 #define R_X86_64_8              14      /* Direct 8 bit sign extended  */
62 #define R_X86_64_PC8            15      /* 8 bit sign extended pc relative */
63
64 #define R_X86_64_NUM            16
65
66 /*
67  * These are used to set parameters in the core dumps.
68  */
69 #define ELF_CLASS       ELFCLASS64
70 #define ELF_DATA        ELFDATA2LSB
71 #define ELF_ARCH        EM_X86_64
72
73 #endif
74
75 #include <asm/vdso.h>
76
77 extern unsigned int vdso_enabled;
78
79 /*
80  * This is used to ensure we don't load something for the wrong architecture.
81  */
82 #define elf_check_arch_ia32(x) \
83         (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
84
85 #include <asm/processor.h>
86
87 #ifdef CONFIG_X86_32
88 #include <asm/system.h>         /* for savesegment */
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(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         savesegment(gs, pr_reg[10]);            \
128         pr_reg[11] = regs->orig_ax;             \
129         pr_reg[12] = regs->ip;                  \
130         pr_reg[13] = regs->cs & 0xffff;         \
131         pr_reg[14] = regs->flags;               \
132         pr_reg[15] = regs->sp;                  \
133         pr_reg[16] = regs->ss & 0xffff;         \
134 } while (0);
135
136 #define ELF_PLATFORM    (utsname()->machine)
137 #define set_personality_64bit() do { } while (0)
138
139 #else /* CONFIG_X86_32 */
140
141 /*
142  * This is used to ensure we don't load something for the wrong architecture.
143  */
144 #define elf_check_arch(x)                       \
145         ((x)->e_machine == EM_X86_64)
146
147 #define compat_elf_check_arch(x)        elf_check_arch_ia32(x)
148
149 static inline void start_ia32_thread(struct pt_regs *regs, u32 ip, u32 sp)
150 {
151         asm volatile("movl %0,%%fs" :: "r" (0));
152         asm volatile("movl %0,%%es; movl %0,%%ds" : : "r" (__USER32_DS));
153         load_gs_index(0);
154         regs->ip = ip;
155         regs->sp = sp;
156         regs->flags = X86_EFLAGS_IF;
157         regs->cs = __USER32_CS;
158         regs->ss = __USER32_DS;
159 }
160
161 static inline void elf_common_init(struct thread_struct *t,
162                                    struct pt_regs *regs, const u16 ds)
163 {
164         regs->ax = regs->bx = regs->cx = regs->dx = 0;
165         regs->si = regs->di = regs->bp = 0;
166         regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
167         regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
168         t->fs = t->gs = 0;
169         t->fsindex = t->gsindex = 0;
170         t->ds = t->es = ds;
171 }
172
173 #define ELF_PLAT_INIT(_r, load_addr)                    \
174 do {                                                    \
175         elf_common_init(&current->thread, _r, 0);       \
176         clear_thread_flag(TIF_IA32);                    \
177 } while (0)
178
179 #define COMPAT_ELF_PLAT_INIT(regs, load_addr)           \
180         elf_common_init(&current->thread, regs, __USER_DS)
181
182 #define compat_start_thread(regs, ip, sp)               \
183 do {                                                    \
184         start_ia32_thread(regs, ip, sp);                \
185         set_fs(USER_DS);                                \
186 } while (0)
187
188 #define COMPAT_SET_PERSONALITY(ex, ibcs2)               \
189 do {                                                    \
190         if (test_thread_flag(TIF_IA32))                 \
191                 clear_thread_flag(TIF_ABI_PENDING);     \
192         else                                            \
193                 set_thread_flag(TIF_ABI_PENDING);       \
194         current->personality |= force_personality32;    \
195 } while (0)
196
197 #define COMPAT_ELF_PLATFORM                     ("i686")
198
199 /*
200  * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
201  * now struct_user_regs, they are different). Assumes current is the process
202  * getting dumped.
203  */
204
205 #define ELF_CORE_COPY_REGS(pr_reg, regs)                        \
206 do {                                                            \
207         unsigned v;                                             \
208         (pr_reg)[0] = (regs)->r15;                              \
209         (pr_reg)[1] = (regs)->r14;                              \
210         (pr_reg)[2] = (regs)->r13;                              \
211         (pr_reg)[3] = (regs)->r12;                              \
212         (pr_reg)[4] = (regs)->bp;                               \
213         (pr_reg)[5] = (regs)->bx;                               \
214         (pr_reg)[6] = (regs)->r11;                              \
215         (pr_reg)[7] = (regs)->r10;                              \
216         (pr_reg)[8] = (regs)->r9;                               \
217         (pr_reg)[9] = (regs)->r8;                               \
218         (pr_reg)[10] = (regs)->ax;                              \
219         (pr_reg)[11] = (regs)->cx;                              \
220         (pr_reg)[12] = (regs)->dx;                              \
221         (pr_reg)[13] = (regs)->si;                              \
222         (pr_reg)[14] = (regs)->di;                              \
223         (pr_reg)[15] = (regs)->orig_ax;                         \
224         (pr_reg)[16] = (regs)->ip;                              \
225         (pr_reg)[17] = (regs)->cs;                              \
226         (pr_reg)[18] = (regs)->flags;                           \
227         (pr_reg)[19] = (regs)->sp;                              \
228         (pr_reg)[20] = (regs)->ss;                              \
229         (pr_reg)[21] = current->thread.fs;                      \
230         (pr_reg)[22] = current->thread.gs;                      \
231         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
232         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
233         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
234         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
235 } while (0);
236
237 /* I'm not sure if we can use '-' here */
238 #define ELF_PLATFORM       ("x86_64")
239 extern void set_personality_64bit(void);
240 extern unsigned int sysctl_vsyscall32;
241 extern int force_personality32;
242
243 #endif /* !CONFIG_X86_32 */
244
245 #define CORE_DUMP_USE_REGSET
246 #define USE_ELF_CORE_DUMP
247 #define ELF_EXEC_PAGESIZE       4096
248
249 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
250    use of this is to invoke "./ld.so someprog" to test out a new version of
251    the loader.  We need to make sure that it is out of the way of the program
252    that it will "exec", and that there is sufficient room for the brk.  */
253
254 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
255
256 /* This yields a mask that user programs can use to figure out what
257    instruction set this CPU supports.  This could be done in user space,
258    but it's not easy, and we've already done it here.  */
259
260 #define ELF_HWCAP               (boot_cpu_data.x86_capability[0])
261
262 /* This yields a string that ld.so will use to load implementation
263    specific libraries for optimization.  This is more specific in
264    intent than poking at uname or /proc/cpuinfo.
265
266    For the moment, we have only optimizations for the Intel generations,
267    but that could change... */
268
269 #define SET_PERSONALITY(ex, ibcs2) set_personality_64bit()
270
271 /*
272  * An executable for which elf_read_implies_exec() returns TRUE will
273  * have the READ_IMPLIES_EXEC personality flag set automatically.
274  */
275 #define elf_read_implies_exec(ex, executable_stack)     \
276         (executable_stack != EXSTACK_DISABLE_X)
277
278 struct task_struct;
279
280 #define ARCH_DLINFO_IA32(vdso_enabled)                                  \
281 do {                                                                    \
282         if (vdso_enabled) {                                             \
283                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
284                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
285         }                                                               \
286 } while (0)
287
288 #ifdef CONFIG_X86_32
289
290 #define VDSO_HIGH_BASE          (__fix_to_virt(FIX_VDSO))
291
292 #define ARCH_DLINFO             ARCH_DLINFO_IA32(vdso_enabled)
293
294 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
295
296 #else /* CONFIG_X86_32 */
297
298 #define VDSO_HIGH_BASE          0xffffe000U /* CONFIG_COMPAT_VDSO address */
299
300 /* 1GB for 64bit, 8MB for 32bit */
301 #define STACK_RND_MASK (test_thread_flag(TIF_IA32) ? 0x7ff : 0x3fffff)
302
303 #define ARCH_DLINFO                                                     \
304 do {                                                                    \
305         if (vdso_enabled)                                               \
306                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
307                             (unsigned long)current->mm->context.vdso);  \
308 } while (0)
309
310 #define AT_SYSINFO              32
311
312 #define COMPAT_ARCH_DLINFO      ARCH_DLINFO_IA32(sysctl_vsyscall32)
313
314 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)
315
316 #endif /* !CONFIG_X86_32 */
317
318 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
319
320 #define VDSO_ENTRY                                                      \
321         ((unsigned long)VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall))
322
323 struct linux_binprm;
324
325 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
326 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
327                                        int executable_stack);
328
329 extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
330 #define compat_arch_setup_additional_pages      syscall32_setup_pages
331
332 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
333 #define arch_randomize_brk arch_randomize_brk
334
335 #endif