[linux-block.git] / include / asm-i386 / elf.h

#ifndef __ASMi386_ELF_H
#define __ASMi386_ELF_H

/*
 * ELF register definitions..
 */

#include <asm/ptrace.h>
#include <asm/user.h>
#include <asm/auxvec.h>

#include <linux/utsname.h>

#define R_386_NONE	0
#define R_386_32	1
#define R_386_PC32	2
#define R_386_GOT32	3
#define R_386_PLT32	4
#define R_386_COPY	5
#define R_386_GLOB_DAT	6
#define R_386_JMP_SLOT	7
#define R_386_RELATIVE	8
#define R_386_GOTOFF	9
#define R_386_GOTPC	10
#define R_386_NUM	11

typedef unsigned long elf_greg_t;

#define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
typedef elf_greg_t elf_gregset_t[ELF_NGREG];

typedef struct user_i387_struct elf_fpregset_t;
typedef struct user_fxsr_struct elf_fpxregset_t;

/*
 * This is used to ensure we don't load something for the wrong architecture.
 */
#define elf_check_arch(x) \
	(((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))

/*
 * These are used to set parameters in the core dumps.
 */
#define ELF_CLASS	ELFCLASS32
#define ELF_DATA	ELFDATA2LSB
#define ELF_ARCH	EM_386

#ifdef __KERNEL__

#include <asm/processor.h>
#include <asm/system.h>		/* for savesegment */
#include <asm/desc.h>

/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
   contains a pointer to a function which might be registered using `atexit'.
   This provides a mean for the dynamic linker to call DT_FINI functions for
   shared libraries that have been loaded before the code runs.

   A value of 0 tells we have no such handler. 

   We might as well make sure everything else is cleared too (except for %esp),
   just to make things more deterministic.
 */
#define ELF_PLAT_INIT(_r, load_addr)	do { \
	_r->ebx = 0; _r->ecx = 0; _r->edx = 0; \
	_r->esi = 0; _r->edi = 0; _r->ebp = 0; \
	_r->eax = 0; \
} while (0)

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE	4096

/* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
   use of this is to invoke "./ld.so someprog" to test out a new version of
   the loader.  We need to make sure that it is out of the way of the program
   that it will "exec", and that there is sufficient room for the brk.  */

#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)

/* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
   now struct_user_regs, they are different) */

#define ELF_CORE_COPY_REGS(pr_reg, regs)		\
	pr_reg[0] = regs->ebx;				\
	pr_reg[1] = regs->ecx;				\
	pr_reg[2] = regs->edx;				\
	pr_reg[3] = regs->esi;				\
	pr_reg[4] = regs->edi;				\
	pr_reg[5] = regs->ebp;				\
	pr_reg[6] = regs->eax;				\
	pr_reg[7] = regs->xds;				\
	pr_reg[8] = regs->xes;				\
	savesegment(fs,pr_reg[9]);			\
	pr_reg[10] = regs->xgs;				\
	pr_reg[11] = regs->orig_eax;			\
	pr_reg[12] = regs->eip;				\
	pr_reg[13] = regs->xcs;				\
	pr_reg[14] = regs->eflags;			\
	pr_reg[15] = regs->esp;				\
	pr_reg[16] = regs->xss;

/* This yields a mask that user programs can use to figure out what
   instruction set this CPU supports.  This could be done in user space,
   but it's not easy, and we've already done it here.  */

#define ELF_HWCAP	(boot_cpu_data.x86_capability[0])

/* This yields a string that ld.so will use to load implementation
   specific libraries for optimization.  This is more specific in
   intent than poking at uname or /proc/cpuinfo.

   For the moment, we have only optimizations for the Intel generations,
   but that could change... */

#define ELF_PLATFORM  (utsname()->machine)

#define SET_PERSONALITY(ex, ibcs2) do { } while (0)

/*
 * An executable for which elf_read_implies_exec() returns TRUE will
 * have the READ_IMPLIES_EXEC personality flag set automatically.
 */
#define elf_read_implies_exec(ex, executable_stack)	(executable_stack != EXSTACK_DISABLE_X)

struct task_struct;

extern int dump_task_regs (struct task_struct *, elf_gregset_t *);
extern int dump_task_fpu (struct task_struct *, elf_fpregset_t *);
extern int dump_task_extended_fpu (struct task_struct *, struct user_fxsr_struct *);

#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
#define ELF_CORE_COPY_FPREGS(tsk, elf_fpregs) dump_task_fpu(tsk, elf_fpregs)
#define ELF_CORE_COPY_XFPREGS(tsk, elf_xfpregs) dump_task_extended_fpu(tsk, elf_xfpregs)

#define VDSO_HIGH_BASE		(__fix_to_virt(FIX_VDSO))
#define VDSO_BASE		((unsigned long)current->mm->context.vdso)

#ifdef CONFIG_COMPAT_VDSO
# define VDSO_COMPAT_BASE	VDSO_HIGH_BASE
# define VDSO_PRELINK		VDSO_HIGH_BASE
#else
# define VDSO_COMPAT_BASE	VDSO_BASE
# define VDSO_PRELINK		0
#endif

#define VDSO_SYM(x) \
		(VDSO_COMPAT_BASE + (unsigned long)(x) - VDSO_PRELINK)

#define VDSO_HIGH_EHDR		((const struct elfhdr *) VDSO_HIGH_BASE)
#define VDSO_EHDR		((const struct elfhdr *) VDSO_COMPAT_BASE)

extern void __kernel_vsyscall;

#define VDSO_ENTRY		VDSO_SYM(&__kernel_vsyscall)

#ifndef CONFIG_COMPAT_VDSO
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
struct linux_binprm;
extern int arch_setup_additional_pages(struct linux_binprm *bprm,
                                       int executable_stack);
#endif

extern unsigned int vdso_enabled;

#define ARCH_DLINFO						\
do if (vdso_enabled) {						\
		NEW_AUX_ENT(AT_SYSINFO,	VDSO_ENTRY);		\
		NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_COMPAT_BASE);	\
} while (0)

/*
 * These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out
 * extra segments containing the vsyscall DSO contents.  Dumping its
 * contents makes post-mortem fully interpretable later without matching up
 * the same kernel and hardware config to see what PC values meant.
 * Dumping its extra ELF program headers includes all the other information
 * a debugger needs to easily find how the vsyscall DSO was being used.
 */
#define ELF_CORE_EXTRA_PHDRS		(VDSO_HIGH_EHDR->e_phnum)
#define ELF_CORE_WRITE_EXTRA_PHDRS					      \
do {									      \
	const struct elf_phdr *const vsyscall_phdrs =			      \
		(const struct elf_phdr *) (VDSO_HIGH_BASE		      \
					   + VDSO_HIGH_EHDR->e_phoff);    \
	int i;								      \
	Elf32_Off ofs = 0;						      \
	for (i = 0; i < VDSO_HIGH_EHDR->e_phnum; ++i) {		      \
		struct elf_phdr phdr = vsyscall_phdrs[i];		      \
		if (phdr.p_type == PT_LOAD) {				      \
			BUG_ON(ofs != 0);				      \
			ofs = phdr.p_offset = offset;			      \
			phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz);	      \
			phdr.p_filesz = phdr.p_memsz;			      \
			offset += phdr.p_filesz;			      \
		}							      \
		else							      \
			phdr.p_offset += ofs;				      \
		phdr.p_paddr = 0; /* match other core phdrs */		      \
		DUMP_WRITE(&phdr, sizeof(phdr));			      \
	}								      \
} while (0)
#define ELF_CORE_WRITE_EXTRA_DATA					      \
do {									      \
	const struct elf_phdr *const vsyscall_phdrs =			      \
		(const struct elf_phdr *) (VDSO_HIGH_BASE		      \
					   + VDSO_HIGH_EHDR->e_phoff);    \
	int i;								      \
	for (i = 0; i < VDSO_HIGH_EHDR->e_phnum; ++i) {		      \
		if (vsyscall_phdrs[i].p_type == PT_LOAD)		      \
			DUMP_WRITE((void *) vsyscall_phdrs[i].p_vaddr,	      \
				   PAGE_ALIGN(vsyscall_phdrs[i].p_memsz));    \
	}								      \
} while (0)

#endif

#endif
Commit	Line	Data
1da177e4 LT	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>
36d57ac4	10	#include <asm/auxvec.h>
1da177e4 LT	11
	12	#include <linux/utsname.h>
	13
	14	#define R_386_NONE 0
	15	#define R_386_32 1
	16	#define R_386_PC32 2
	17	#define R_386_GOT32 3
	18	#define R_386_PLT32 4
	19	#define R_386_COPY 5
	20	#define R_386_GLOB_DAT 6
	21	#define R_386_JMP_SLOT 7
	22	#define R_386_RELATIVE 8
	23	#define R_386_GOTOFF 9
	24	#define R_386_GOTPC 10
	25	#define R_386_NUM 11
	26
	27	typedef unsigned long elf_greg_t;
	28
	29	#define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
	30	typedef elf_greg_t elf_gregset_t[ELF_NGREG];
	31
	32	typedef struct user_i387_struct elf_fpregset_t;
	33	typedef struct user_fxsr_struct elf_fpxregset_t;
	34
	35	/*
	36	* This is used to ensure we don't load something for the wrong architecture.
	37	*/
	38	#define elf_check_arch(x) \
	39	(((x)->e_machine == EM_386) \|\| ((x)->e_machine == EM_486))
	40
	41	/*
	42	* These are used to set parameters in the core dumps.
	43	*/
	44	#define ELF_CLASS ELFCLASS32
	45	#define ELF_DATA ELFDATA2LSB
	46	#define ELF_ARCH EM_386
	47
651c923a DW	48	#ifdef __KERNEL__
	49
	50	#include <asm/processor.h>
	51	#include <asm/system.h> /* for savesegment */
	52	#include <asm/desc.h>
	53
1da177e4 LT	54	/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
	55	contains a pointer to a function which might be registered using `atexit'.
	56	This provides a mean for the dynamic linker to call DT_FINI functions for
	57	shared libraries that have been loaded before the code runs.
	58
	59	A value of 0 tells we have no such handler.
	60
	61	We might as well make sure everything else is cleared too (except for %esp),
	62	just to make things more deterministic.
	63	*/
	64	#define ELF_PLAT_INIT(_r, load_addr) do { \
	65	_r->ebx = 0; _r->ecx = 0; _r->edx = 0; \
	66	_r->esi = 0; _r->edi = 0; _r->ebp = 0; \
	67	_r->eax = 0; \
	68	} while (0)
	69
	70	#define USE_ELF_CORE_DUMP
	71	#define ELF_EXEC_PAGESIZE 4096
	72
	73	/* This is the location that an ET_DYN program is loaded if exec'ed. Typical
	74	use of this is to invoke "./ld.so someprog" to test out a new version of
	75	the loader. We need to make sure that it is out of the way of the program
	76	that it will "exec", and that there is sufficient room for the brk. */
	77
	78	#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
	79
	80	/* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
	81	now struct_user_regs, they are different) */
	82
	83	#define ELF_CORE_COPY_REGS(pr_reg, regs) \
	84	pr_reg[0] = regs->ebx; \
	85	pr_reg[1] = regs->ecx; \
	86	pr_reg[2] = regs->edx; \
	87	pr_reg[3] = regs->esi; \
	88	pr_reg[4] = regs->edi; \
	89	pr_reg[5] = regs->ebp; \
	90	pr_reg[6] = regs->eax; \
	91	pr_reg[7] = regs->xds; \
	92	pr_reg[8] = regs->xes; \
	93	savesegment(fs,pr_reg[9]); \
66e10a44	94	pr_reg[10] = regs->xgs; \
1da177e4 LT	95	pr_reg[11] = regs->orig_eax; \
	96	pr_reg[12] = regs->eip; \
	97	pr_reg[13] = regs->xcs; \
	98	pr_reg[14] = regs->eflags; \
	99	pr_reg[15] = regs->esp; \
	100	pr_reg[16] = regs->xss;
	101
	102	/* This yields a mask that user programs can use to figure out what
	103	instruction set this CPU supports. This could be done in user space,
	104	but it's not easy, and we've already done it here. */
	105
	106	#define ELF_HWCAP (boot_cpu_data.x86_capability[0])
	107
	108	/* This yields a string that ld.so will use to load implementation
	109	specific libraries for optimization. This is more specific in
	110	intent than poking at uname or /proc/cpuinfo.
	111
	112	For the moment, we have only optimizations for the Intel generations,
	113	but that could change... */
	114
e9ff3990	115	#define ELF_PLATFORM (utsname()->machine)
1da177e4	116
1da177e4 LT	117	#define SET_PERSONALITY(ex, ibcs2) do { } while (0)
	118
	119	/*
	120	* An executable for which elf_read_implies_exec() returns TRUE will
	121	* have the READ_IMPLIES_EXEC personality flag set automatically.
	122	*/
	123	#define elf_read_implies_exec(ex, executable_stack) (executable_stack != EXSTACK_DISABLE_X)
	124
8c65b4a6 TS	125	struct task_struct;
8c65b4a6 TS	126
1da177e4 LT	127	extern int dump_task_regs (struct task_struct , elf_gregset_t );
	128	extern int dump_task_fpu (struct task_struct , elf_fpregset_t );
	129	extern int dump_task_extended_fpu (struct task_struct , struct user_fxsr_struct );
	130
	131	#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
	132	#define ELF_CORE_COPY_FPREGS(tsk, elf_fpregs) dump_task_fpu(tsk, elf_fpregs)
	133	#define ELF_CORE_COPY_XFPREGS(tsk, elf_xfpregs) dump_task_extended_fpu(tsk, elf_xfpregs)
	134
e6e5494c IM	135	#define VDSO_HIGH_BASE (__fix_to_virt(FIX_VDSO))
	136	#define VDSO_BASE ((unsigned long)current->mm->context.vdso)
	137
	138	#ifdef CONFIG_COMPAT_VDSO
	139	# define VDSO_COMPAT_BASE VDSO_HIGH_BASE
	140	# define VDSO_PRELINK VDSO_HIGH_BASE
	141	#else
	142	# define VDSO_COMPAT_BASE VDSO_BASE
	143	# define VDSO_PRELINK 0
	144	#endif
	145
e6e5494c	146	#define VDSO_SYM(x) \
a1f3bb9a	147	(VDSO_COMPAT_BASE + (unsigned long)(x) - VDSO_PRELINK)
e6e5494c IM	148
	149	#define VDSO_HIGH_EHDR ((const struct elfhdr *) VDSO_HIGH_BASE)
	150	#define VDSO_EHDR ((const struct elfhdr *) VDSO_COMPAT_BASE)
	151
1da177e4 LT	152	extern void __kernel_vsyscall;
1da177e4 LT	153
e6e5494c IM	154	#define VDSO_ENTRY VDSO_SYM(&__kernel_vsyscall)
e6e5494c IM	155
a1f3bb9a	156	#ifndef CONFIG_COMPAT_VDSO
e6e5494c IM	157	#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
	158	struct linux_binprm;
	159	extern int arch_setup_additional_pages(struct linux_binprm *bprm,
	160	int executable_stack);
a1f3bb9a	161	#endif
e6e5494c IM	162
	163	extern unsigned int vdso_enabled;
	164
1da177e4	165	#define ARCH_DLINFO \
e6e5494c IM	166	do if (vdso_enabled) { \
	167	NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \
	168	NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_COMPAT_BASE); \
1da177e4 LT	169	} while (0)
	170
	171	/*
	172	* These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out
	173	* extra segments containing the vsyscall DSO contents. Dumping its
	174	* contents makes post-mortem fully interpretable later without matching up
	175	* the same kernel and hardware config to see what PC values meant.
	176	* Dumping its extra ELF program headers includes all the other information
	177	* a debugger needs to easily find how the vsyscall DSO was being used.
	178	*/
e6e5494c	179	#define ELF_CORE_EXTRA_PHDRS (VDSO_HIGH_EHDR->e_phnum)
1da177e4 LT	180	#define ELF_CORE_WRITE_EXTRA_PHDRS \
	181	do { \
	182	const struct elf_phdr *const vsyscall_phdrs = \
e6e5494c IM	183	(const struct elf_phdr *) (VDSO_HIGH_BASE \
e6e5494c IM	184	+ VDSO_HIGH_EHDR->e_phoff); \
1da177e4 LT	185	int i; \
1da177e4 LT	186	Elf32_Off ofs = 0; \
e6e5494c	187	for (i = 0; i < VDSO_HIGH_EHDR->e_phnum; ++i) { \
1da177e4 LT	188	struct elf_phdr phdr = vsyscall_phdrs[i]; \
	189	if (phdr.p_type == PT_LOAD) { \
	190	BUG_ON(ofs != 0); \
	191	ofs = phdr.p_offset = offset; \
	192	phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz); \
	193	phdr.p_filesz = phdr.p_memsz; \
	194	offset += phdr.p_filesz; \
	195	} \
	196	else \
	197	phdr.p_offset += ofs; \
	198	phdr.p_paddr = 0; /* match other core phdrs */ \
	199	DUMP_WRITE(&phdr, sizeof(phdr)); \
	200	} \
	201	} while (0)
	202	#define ELF_CORE_WRITE_EXTRA_DATA \
	203	do { \
	204	const struct elf_phdr *const vsyscall_phdrs = \
e6e5494c IM	205	(const struct elf_phdr *) (VDSO_HIGH_BASE \
e6e5494c IM	206	+ VDSO_HIGH_EHDR->e_phoff); \
1da177e4	207	int i; \
e6e5494c	208	for (i = 0; i < VDSO_HIGH_EHDR->e_phnum; ++i) { \
1da177e4 LT	209	if (vsyscall_phdrs[i].p_type == PT_LOAD) \
	210	DUMP_WRITE((void *) vsyscall_phdrs[i].p_vaddr, \
	211	PAGE_ALIGN(vsyscall_phdrs[i].p_memsz)); \
	212	} \
	213	} while (0)
	214
	215	#endif
	216
	217	#endif