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