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1 | #ifndef __ASMi386_ELF_H |
2 | #define __ASMi386_ELF_H | |
3 | ||
4 | /* | |
5 | * ELF register definitions.. | |
6 | */ | |
7 | ||
8 | #include <asm/ptrace.h> | |
9 | #include <asm/user.h> | |
10 | #include <asm/processor.h> | |
11 | #include <asm/system.h> /* for savesegment */ | |
12 | ||
13 | #include <linux/utsname.h> | |
14 | ||
15 | #define R_386_NONE 0 | |
16 | #define R_386_32 1 | |
17 | #define R_386_PC32 2 | |
18 | #define R_386_GOT32 3 | |
19 | #define R_386_PLT32 4 | |
20 | #define R_386_COPY 5 | |
21 | #define R_386_GLOB_DAT 6 | |
22 | #define R_386_JMP_SLOT 7 | |
23 | #define R_386_RELATIVE 8 | |
24 | #define R_386_GOTOFF 9 | |
25 | #define R_386_GOTPC 10 | |
26 | #define R_386_NUM 11 | |
27 | ||
28 | typedef unsigned long elf_greg_t; | |
29 | ||
30 | #define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t)) | |
31 | typedef elf_greg_t elf_gregset_t[ELF_NGREG]; | |
32 | ||
33 | typedef struct user_i387_struct elf_fpregset_t; | |
34 | typedef struct user_fxsr_struct elf_fpxregset_t; | |
35 | ||
36 | /* | |
37 | * This is used to ensure we don't load something for the wrong architecture. | |
38 | */ | |
39 | #define elf_check_arch(x) \ | |
40 | (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486)) | |
41 | ||
42 | /* | |
43 | * These are used to set parameters in the core dumps. | |
44 | */ | |
45 | #define ELF_CLASS ELFCLASS32 | |
46 | #define ELF_DATA ELFDATA2LSB | |
47 | #define ELF_ARCH EM_386 | |
48 | ||
49 | /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx | |
50 | contains a pointer to a function which might be registered using `atexit'. | |
51 | This provides a mean for the dynamic linker to call DT_FINI functions for | |
52 | shared libraries that have been loaded before the code runs. | |
53 | ||
54 | A value of 0 tells we have no such handler. | |
55 | ||
56 | We might as well make sure everything else is cleared too (except for %esp), | |
57 | just to make things more deterministic. | |
58 | */ | |
59 | #define ELF_PLAT_INIT(_r, load_addr) do { \ | |
60 | _r->ebx = 0; _r->ecx = 0; _r->edx = 0; \ | |
61 | _r->esi = 0; _r->edi = 0; _r->ebp = 0; \ | |
62 | _r->eax = 0; \ | |
63 | } while (0) | |
64 | ||
65 | #define USE_ELF_CORE_DUMP | |
66 | #define ELF_EXEC_PAGESIZE 4096 | |
67 | ||
68 | /* This is the location that an ET_DYN program is loaded if exec'ed. Typical | |
69 | use of this is to invoke "./ld.so someprog" to test out a new version of | |
70 | the loader. We need to make sure that it is out of the way of the program | |
71 | that it will "exec", and that there is sufficient room for the brk. */ | |
72 | ||
73 | #define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2) | |
74 | ||
75 | /* regs is struct pt_regs, pr_reg is elf_gregset_t (which is | |
76 | now struct_user_regs, they are different) */ | |
77 | ||
78 | #define ELF_CORE_COPY_REGS(pr_reg, regs) \ | |
79 | pr_reg[0] = regs->ebx; \ | |
80 | pr_reg[1] = regs->ecx; \ | |
81 | pr_reg[2] = regs->edx; \ | |
82 | pr_reg[3] = regs->esi; \ | |
83 | pr_reg[4] = regs->edi; \ | |
84 | pr_reg[5] = regs->ebp; \ | |
85 | pr_reg[6] = regs->eax; \ | |
86 | pr_reg[7] = regs->xds; \ | |
87 | pr_reg[8] = regs->xes; \ | |
88 | savesegment(fs,pr_reg[9]); \ | |
89 | savesegment(gs,pr_reg[10]); \ | |
90 | pr_reg[11] = regs->orig_eax; \ | |
91 | pr_reg[12] = regs->eip; \ | |
92 | pr_reg[13] = regs->xcs; \ | |
93 | pr_reg[14] = regs->eflags; \ | |
94 | pr_reg[15] = regs->esp; \ | |
95 | pr_reg[16] = regs->xss; | |
96 | ||
97 | /* This yields a mask that user programs can use to figure out what | |
98 | instruction set this CPU supports. This could be done in user space, | |
99 | but it's not easy, and we've already done it here. */ | |
100 | ||
101 | #define ELF_HWCAP (boot_cpu_data.x86_capability[0]) | |
102 | ||
103 | /* This yields a string that ld.so will use to load implementation | |
104 | specific libraries for optimization. This is more specific in | |
105 | intent than poking at uname or /proc/cpuinfo. | |
106 | ||
107 | For the moment, we have only optimizations for the Intel generations, | |
108 | but that could change... */ | |
109 | ||
110 | #define ELF_PLATFORM (system_utsname.machine) | |
111 | ||
112 | /* | |
113 | * Architecture-neutral AT_ values in 0-17, leave some room | |
114 | * for more of them, start the x86-specific ones at 32. | |
115 | */ | |
116 | #define AT_SYSINFO 32 | |
117 | #define AT_SYSINFO_EHDR 33 | |
118 | ||
119 | #ifdef __KERNEL__ | |
120 | #define SET_PERSONALITY(ex, ibcs2) do { } while (0) | |
121 | ||
122 | /* | |
123 | * An executable for which elf_read_implies_exec() returns TRUE will | |
124 | * have the READ_IMPLIES_EXEC personality flag set automatically. | |
125 | */ | |
126 | #define elf_read_implies_exec(ex, executable_stack) (executable_stack != EXSTACK_DISABLE_X) | |
127 | ||
128 | extern int dump_task_regs (struct task_struct *, elf_gregset_t *); | |
129 | extern int dump_task_fpu (struct task_struct *, elf_fpregset_t *); | |
130 | extern int dump_task_extended_fpu (struct task_struct *, struct user_fxsr_struct *); | |
131 | ||
132 | #define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs) | |
133 | #define ELF_CORE_COPY_FPREGS(tsk, elf_fpregs) dump_task_fpu(tsk, elf_fpregs) | |
134 | #define ELF_CORE_COPY_XFPREGS(tsk, elf_xfpregs) dump_task_extended_fpu(tsk, elf_xfpregs) | |
135 | ||
136 | #define VSYSCALL_BASE (__fix_to_virt(FIX_VSYSCALL)) | |
137 | #define VSYSCALL_EHDR ((const struct elfhdr *) VSYSCALL_BASE) | |
138 | #define VSYSCALL_ENTRY ((unsigned long) &__kernel_vsyscall) | |
139 | extern void __kernel_vsyscall; | |
140 | ||
141 | #define ARCH_DLINFO \ | |
142 | do { \ | |
143 | NEW_AUX_ENT(AT_SYSINFO, VSYSCALL_ENTRY); \ | |
144 | NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL_BASE); \ | |
145 | } while (0) | |
146 | ||
147 | /* | |
148 | * These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out | |
149 | * extra segments containing the vsyscall DSO contents. Dumping its | |
150 | * contents makes post-mortem fully interpretable later without matching up | |
151 | * the same kernel and hardware config to see what PC values meant. | |
152 | * Dumping its extra ELF program headers includes all the other information | |
153 | * a debugger needs to easily find how the vsyscall DSO was being used. | |
154 | */ | |
155 | #define ELF_CORE_EXTRA_PHDRS (VSYSCALL_EHDR->e_phnum) | |
156 | #define ELF_CORE_WRITE_EXTRA_PHDRS \ | |
157 | do { \ | |
158 | const struct elf_phdr *const vsyscall_phdrs = \ | |
159 | (const struct elf_phdr *) (VSYSCALL_BASE \ | |
160 | + VSYSCALL_EHDR->e_phoff); \ | |
161 | int i; \ | |
162 | Elf32_Off ofs = 0; \ | |
163 | for (i = 0; i < VSYSCALL_EHDR->e_phnum; ++i) { \ | |
164 | struct elf_phdr phdr = vsyscall_phdrs[i]; \ | |
165 | if (phdr.p_type == PT_LOAD) { \ | |
166 | BUG_ON(ofs != 0); \ | |
167 | ofs = phdr.p_offset = offset; \ | |
168 | phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz); \ | |
169 | phdr.p_filesz = phdr.p_memsz; \ | |
170 | offset += phdr.p_filesz; \ | |
171 | } \ | |
172 | else \ | |
173 | phdr.p_offset += ofs; \ | |
174 | phdr.p_paddr = 0; /* match other core phdrs */ \ | |
175 | DUMP_WRITE(&phdr, sizeof(phdr)); \ | |
176 | } \ | |
177 | } while (0) | |
178 | #define ELF_CORE_WRITE_EXTRA_DATA \ | |
179 | do { \ | |
180 | const struct elf_phdr *const vsyscall_phdrs = \ | |
181 | (const struct elf_phdr *) (VSYSCALL_BASE \ | |
182 | + VSYSCALL_EHDR->e_phoff); \ | |
183 | int i; \ | |
184 | for (i = 0; i < VSYSCALL_EHDR->e_phnum; ++i) { \ | |
185 | if (vsyscall_phdrs[i].p_type == PT_LOAD) \ | |
186 | DUMP_WRITE((void *) vsyscall_phdrs[i].p_vaddr, \ | |
187 | PAGE_ALIGN(vsyscall_phdrs[i].p_memsz)); \ | |
188 | } \ | |
189 | } while (0) | |
190 | ||
191 | #endif | |
192 | ||
193 | #endif |