5 * ELF register definitions..
7 #include <linux/thread_info.h>
9 #include <asm/ptrace.h>
11 #include <asm/auxvec.h>
13 typedef unsigned long elf_greg_t
;
15 #define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
16 typedef elf_greg_t elf_gregset_t
[ELF_NGREG
];
18 typedef struct user_i387_struct elf_fpregset_t
;
22 typedef struct user_fxsr_struct elf_fpxregset_t
;
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
38 * These are used to set parameters in the core dumps.
40 #define ELF_CLASS ELFCLASS32
41 #define ELF_DATA ELFDATA2LSB
42 #define ELF_ARCH EM_386
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
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 */
65 #define R_X86_64_NUM 16
68 * These are used to set parameters in the core dumps.
70 #define ELF_CLASS ELFCLASS64
71 #define ELF_DATA ELFDATA2LSB
72 #define ELF_ARCH EM_X86_64
79 extern unsigned int vdso64_enabled
;
81 #if defined(CONFIG_X86_32) || defined(CONFIG_COMPAT)
82 extern unsigned int vdso32_enabled
;
86 * This is used to ensure we don't load something for the wrong architecture.
88 #define elf_check_arch_ia32(x) \
89 (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
91 #include <asm/processor.h>
96 #define elf_check_arch(x) elf_check_arch_ia32(x)
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.
103 A value of 0 tells we have no such handler.
105 We might as well make sure everything else is cleared too (except for %esp),
106 just to make things more deterministic.
108 #define ELF_PLAT_INIT(_r, load_addr) \
110 _r->bx = 0; _r->cx = 0; _r->dx = 0; \
111 _r->si = 0; _r->di = 0; _r->bp = 0; \
116 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
117 * now struct_user_regs, they are different)
120 #define ELF_CORE_COPY_REGS_COMMON(pr_reg, regs) \
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; \
140 #define ELF_CORE_COPY_REGS(pr_reg, regs) \
142 ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
143 pr_reg[10] = get_user_gs(regs); \
146 #define ELF_CORE_COPY_KERNEL_REGS(pr_reg, regs) \
148 ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
149 savesegment(gs, pr_reg[10]); \
152 #define ELF_PLATFORM (utsname()->machine)
153 #define set_personality_64bit() do { } while (0)
155 #else /* CONFIG_X86_32 */
158 * This is used to ensure we don't load something for the wrong architecture.
160 #define elf_check_arch(x) \
161 ((x)->e_machine == EM_X86_64)
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))
167 #if __USER32_DS != __USER_DS
168 # error "The following code assumes __USER32_DS == __USER_DS"
171 static inline void elf_common_init(struct thread_struct
*t
,
172 struct pt_regs
*regs
, const u16 ds
)
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;
179 t
->fsindex
= t
->gsindex
= 0;
183 #define ELF_PLAT_INIT(_r, load_addr) \
184 elf_common_init(¤t->thread, _r, 0)
186 #define COMPAT_ELF_PLAT_INIT(regs, load_addr) \
187 elf_common_init(¤t->thread, regs, __USER_DS)
189 void start_thread_ia32(struct pt_regs
*regs
, u32 new_ip
, u32 new_sp
);
190 #define compat_start_thread start_thread_ia32
192 void set_personality_ia32(bool);
193 #define COMPAT_SET_PERSONALITY(ex) \
194 set_personality_ia32((ex).e_machine == EM_X86_64)
196 #define COMPAT_ELF_PLATFORM ("i686")
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
204 #define ELF_CORE_COPY_REGS(pr_reg, regs) \
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; \
236 /* I'm not sure if we can use '-' here */
237 #define ELF_PLATFORM ("x86_64")
238 extern void set_personality_64bit(void);
239 extern unsigned int sysctl_vsyscall32
;
240 extern int force_personality32
;
242 #endif /* !CONFIG_X86_32 */
244 #define CORE_DUMP_USE_REGSET
245 #define ELF_EXEC_PAGESIZE 4096
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. */
252 #define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
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. */
258 #define ELF_HWCAP (boot_cpu_data.x86_capability[0])
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.
264 For the moment, we have only optimizations for the Intel generations,
265 but that could change... */
267 #define SET_PERSONALITY(ex) set_personality_64bit()
270 * An executable for which elf_read_implies_exec() returns TRUE will
271 * have the READ_IMPLIES_EXEC personality flag set automatically.
273 #define elf_read_implies_exec(ex, executable_stack) \
274 (executable_stack != EXSTACK_DISABLE_X)
278 #define ARCH_DLINFO_IA32 \
280 if (vdso32_enabled) { \
281 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \
282 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \
288 #define STACK_RND_MASK (0x7ff)
290 #define ARCH_DLINFO ARCH_DLINFO_IA32
292 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
294 #else /* CONFIG_X86_32 */
296 /* 1GB for 64bit, 8MB for 32bit */
297 #define STACK_RND_MASK (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff)
299 #define ARCH_DLINFO \
301 if (vdso64_enabled) \
302 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
303 (unsigned long __force)current->mm->context.vdso); \
306 /* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */
307 #define ARCH_DLINFO_X32 \
309 if (vdso64_enabled) \
310 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
311 (unsigned long __force)current->mm->context.vdso); \
314 #define AT_SYSINFO 32
316 #define COMPAT_ARCH_DLINFO \
317 if (test_thread_flag(TIF_X32)) \
322 #define COMPAT_ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000)
324 #endif /* !CONFIG_X86_32 */
326 #define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso)
329 ((unsigned long)current->mm->context.vdso + \
330 selected_vdso32->sym___kernel_vsyscall)
334 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
335 extern int arch_setup_additional_pages(struct linux_binprm
*bprm
,
337 extern int compat_arch_setup_additional_pages(struct linux_binprm
*bprm
,
339 #define compat_arch_setup_additional_pages compat_arch_setup_additional_pages
341 extern unsigned long arch_randomize_brk(struct mm_struct
*mm
);
342 #define arch_randomize_brk arch_randomize_brk
345 * True on X86_32 or when emulating IA32 on X86_64
347 static inline int mmap_is_ia32(void)
352 #ifdef CONFIG_IA32_EMULATION
353 if (test_thread_flag(TIF_ADDR32
))
359 /* Do not change the values. See get_align_mask() */
361 ALIGN_VA_32
= BIT(0),
362 ALIGN_VA_64
= BIT(1),
365 struct va_alignment
{
368 } ____cacheline_aligned
;
370 extern struct va_alignment va_align
;
371 extern unsigned long align_vdso_addr(unsigned long);
372 #endif /* _ASM_X86_ELF_H */