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/auxvec.h>
11
12#define R_386_NONE	0
13#define R_386_32	1
14#define R_386_PC32	2
15#define R_386_GOT32	3
16#define R_386_PLT32	4
17#define R_386_COPY	5
18#define R_386_GLOB_DAT	6
19#define R_386_JMP_SLOT	7
20#define R_386_RELATIVE	8
21#define R_386_GOTOFF	9
22#define R_386_GOTPC	10
23#define R_386_NUM	11
24
25typedef unsigned long elf_greg_t;
26
27#define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
28typedef elf_greg_t elf_gregset_t[ELF_NGREG];
29
30typedef struct user_i387_struct elf_fpregset_t;
31typedef struct user_fxsr_struct elf_fpxregset_t;
32
33/*
34 * This is used to ensure we don't load something for the wrong architecture.
35 */
36#define elf_check_arch(x) \
37	(((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
38
39/*
40 * These are used to set parameters in the core dumps.
41 */
42#define ELF_CLASS	ELFCLASS32
43#define ELF_DATA	ELFDATA2LSB
44#define ELF_ARCH	EM_386
45
46#ifdef __KERNEL__
47
48#include <asm/processor.h>
49#include <asm/system.h>		/* for savesegment */
50#include <asm/desc.h>
51
52/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
53   contains a pointer to a function which might be registered using `atexit'.
54   This provides a mean for the dynamic linker to call DT_FINI functions for
55   shared libraries that have been loaded before the code runs.
56
57   A value of 0 tells we have no such handler.
58
59   We might as well make sure everything else is cleared too (except for %esp),
60   just to make things more deterministic.
61 */
62#define ELF_PLAT_INIT(_r, load_addr)	do { \
63	_r->ebx = 0; _r->ecx = 0; _r->edx = 0; \
64	_r->esi = 0; _r->edi = 0; _r->ebp = 0; \
65	_r->eax = 0; \
66} while (0)
67
68#define USE_ELF_CORE_DUMP
69#define ELF_EXEC_PAGESIZE	4096
70
71/* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
72   use of this is to invoke "./ld.so someprog" to test out a new version of
73   the loader.  We need to make sure that it is out of the way of the program
74   that it will "exec", and that there is sufficient room for the brk.  */
75
76#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
77
78/* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
79   now struct_user_regs, they are different) */
80
81#define ELF_CORE_COPY_REGS(pr_reg, regs)		\
82	pr_reg[0] = regs->ebx;				\
83	pr_reg[1] = regs->ecx;				\
84	pr_reg[2] = regs->edx;				\
85	pr_reg[3] = regs->esi;				\
86	pr_reg[4] = regs->edi;				\
87	pr_reg[5] = regs->ebp;				\
88	pr_reg[6] = regs->eax;				\
89	pr_reg[7] = regs->xds & 0xffff;			\
90	pr_reg[8] = regs->xes & 0xffff;			\
91	pr_reg[9] = regs->xfs & 0xffff;			\
92	savesegment(gs,pr_reg[10]);			\
93	pr_reg[11] = regs->orig_eax;			\
94	pr_reg[12] = regs->eip;				\
95	pr_reg[13] = regs->xcs & 0xffff;		\
96	pr_reg[14] = regs->eflags;			\
97	pr_reg[15] = regs->esp;				\
98	pr_reg[16] = regs->xss & 0xffff;
99
100/* This yields a mask that user programs can use to figure out what
101   instruction set this CPU supports.  This could be done in user space,
102   but it's not easy, and we've already done it here.  */
103
104#define ELF_HWCAP	(boot_cpu_data.x86_capability[0])
105
106/* This yields a string that ld.so will use to load implementation
107   specific libraries for optimization.  This is more specific in
108   intent than poking at uname or /proc/cpuinfo.
109
110   For the moment, we have only optimizations for the Intel generations,
111   but that could change... */
112
113#define ELF_PLATFORM  (utsname()->machine)
114
115#define SET_PERSONALITY(ex, ibcs2) do { } while (0)
116
117/*
118 * An executable for which elf_read_implies_exec() returns TRUE will
119 * have the READ_IMPLIES_EXEC personality flag set automatically.
120 */
121#define elf_read_implies_exec(ex, executable_stack)	(executable_stack != EXSTACK_DISABLE_X)
122
123struct task_struct;
124
125extern int dump_task_regs (struct task_struct *, elf_gregset_t *);
126extern int dump_task_fpu (struct task_struct *, elf_fpregset_t *);
127extern int dump_task_extended_fpu (struct task_struct *, struct user_fxsr_struct *);
128
129#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
130#define ELF_CORE_COPY_FPREGS(tsk, elf_fpregs) dump_task_fpu(tsk, elf_fpregs)
131#define ELF_CORE_COPY_XFPREGS(tsk, elf_xfpregs) dump_task_extended_fpu(tsk, elf_xfpregs)
132
133#define VDSO_HIGH_BASE		(__fix_to_virt(FIX_VDSO))
134#define VDSO_CURRENT_BASE	((unsigned long)current->mm->context.vdso)
135#define VDSO_PRELINK		0
136
137#define VDSO_SYM(x) \
138		(VDSO_CURRENT_BASE + (unsigned long)(x) - VDSO_PRELINK)
139
140#define VDSO_HIGH_EHDR		((const struct elfhdr *) VDSO_HIGH_BASE)
141#define VDSO_EHDR		((const struct elfhdr *) VDSO_CURRENT_BASE)
142
143extern void __kernel_vsyscall;
144
145#define VDSO_ENTRY		VDSO_SYM(&__kernel_vsyscall)
146
147struct linux_binprm;
148
149#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
150extern int arch_setup_additional_pages(struct linux_binprm *bprm,
151                                       int executable_stack);
152
153extern unsigned int vdso_enabled;
154
155#define ARCH_DLINFO							\
156do if (vdso_enabled) {							\
157		NEW_AUX_ENT(AT_SYSINFO,	VDSO_ENTRY);			\
158		NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);	\
159} while (0)
160
161#endif
162
163#endif
164