[linux-2.6-block.git] / arch / x86_64 / ia32 / ia32_binfmt.c

/* 
 * Written 2000,2002 by Andi Kleen. 
 * 
 * Loosely based on the sparc64 and IA64 32bit emulation loaders.
 * This tricks binfmt_elf.c into loading 32bit binaries using lots 
 * of ugly preprocessor tricks. Talk about very very poor man's inheritance.
 */ 
#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/rwsem.h>
#include <linux/sched.h>
#include <linux/compat.h>
#include <linux/string.h>
#include <linux/binfmts.h>
#include <linux/mm.h>
#include <linux/security.h>

#include <asm/segment.h> 
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/user32.h>
#include <asm/sigcontext32.h>
#include <asm/fpu32.h>
#include <asm/i387.h>
#include <asm/uaccess.h>
#include <asm/ia32.h>
#include <asm/vsyscall32.h>

#define ELF_NAME "elf/i386"

#define AT_SYSINFO 32
#define AT_SYSINFO_EHDR		33

int sysctl_vsyscall32 = 1;

#define ARCH_DLINFO do {  \
	if (sysctl_vsyscall32) { \
	NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \
	NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE);    \
	}	\
} while(0)

struct file;
struct elf_phdr; 

#define IA32_EMULATOR 1

#define ELF_ET_DYN_BASE		(TASK_UNMAPPED_BASE + 0x1000000)

#undef ELF_ARCH
#define ELF_ARCH EM_386

#undef ELF_CLASS
#define ELF_CLASS ELFCLASS32

#define ELF_DATA	ELFDATA2LSB

#define USE_ELF_CORE_DUMP 1

/* Override elfcore.h */ 
#define _LINUX_ELFCORE_H 1
typedef unsigned int elf_greg_t;

#define ELF_NGREG (sizeof (struct user_regs_struct32) / sizeof(elf_greg_t))
typedef elf_greg_t elf_gregset_t[ELF_NGREG];

/*
 * 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	(find_vma(current->mm, VSYSCALL32_BASE) ?     \
    (VSYSCALL32_EHDR->e_phnum) : 0)
#define ELF_CORE_WRITE_EXTRA_PHDRS					      \
do {									      \
	if (find_vma(current->mm, VSYSCALL32_BASE)) { 			      \
		const struct elf32_phdr *const vsyscall_phdrs =		      \
			(const struct elf32_phdr *) (VSYSCALL32_BASE	      \
						   + VSYSCALL32_EHDR->e_phoff);\
		int i;							      \
		Elf32_Off ofs = 0;					      \
		for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) {	      \
			struct elf32_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 {									      \
	if (find_vma(current->mm, VSYSCALL32_BASE)) { 			      \
		const struct elf32_phdr *const vsyscall_phdrs =		      \
			(const struct elf32_phdr *) (VSYSCALL32_BASE	      \
						   + VSYSCALL32_EHDR->e_phoff);      \
		int i;							      \
		for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) {	      \
			if (vsyscall_phdrs[i].p_type == PT_LOAD)	      \
				DUMP_WRITE((void *) (u64) vsyscall_phdrs[i].p_vaddr,\
				    PAGE_ALIGN(vsyscall_phdrs[i].p_memsz));   \
		}							      \
	}								      \
} while (0)

struct elf_siginfo
{
	int	si_signo;			/* signal number */
	int	si_code;			/* extra code */
	int	si_errno;			/* errno */
};

#define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0)

struct elf_prstatus
{
	struct elf_siginfo pr_info;	/* Info associated with signal */
	short	pr_cursig;		/* Current signal */
	unsigned int pr_sigpend;	/* Set of pending signals */
	unsigned int pr_sighold;	/* Set of held signals */
	pid_t	pr_pid;
	pid_t	pr_ppid;
	pid_t	pr_pgrp;
	pid_t	pr_sid;
	struct compat_timeval pr_utime;	/* User time */
	struct compat_timeval pr_stime;	/* System time */
	struct compat_timeval pr_cutime;	/* Cumulative user time */
	struct compat_timeval pr_cstime;	/* Cumulative system time */
	elf_gregset_t pr_reg;	/* GP registers */
	int pr_fpvalid;		/* True if math co-processor being used.  */
};

#define ELF_PRARGSZ	(80)	/* Number of chars for args */

struct elf_prpsinfo
{
	char	pr_state;	/* numeric process state */
	char	pr_sname;	/* char for pr_state */
	char	pr_zomb;	/* zombie */
	char	pr_nice;	/* nice val */
	unsigned int pr_flag;	/* flags */
	__u16	pr_uid;
	__u16	pr_gid;
	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
	/* Lots missing */
	char	pr_fname[16];	/* filename of executable */
	char	pr_psargs[ELF_PRARGSZ];	/* initial part of arg list */
};

#define __STR(x) #x
#define STR(x) __STR(x)

#define _GET_SEG(x) \
	({ __u32 seg; asm("movl %%" STR(x) ",%0" : "=r"(seg)); seg; })

/* Assumes current==process to be dumped */
#define ELF_CORE_COPY_REGS(pr_reg, regs)       		\
	pr_reg[0] = regs->rbx;				\
	pr_reg[1] = regs->rcx;				\
	pr_reg[2] = regs->rdx;				\
	pr_reg[3] = regs->rsi;				\
	pr_reg[4] = regs->rdi;				\
	pr_reg[5] = regs->rbp;				\
	pr_reg[6] = regs->rax;				\
	pr_reg[7] = _GET_SEG(ds);   			\
	pr_reg[8] = _GET_SEG(es);			\
	pr_reg[9] = _GET_SEG(fs);			\
	pr_reg[10] = _GET_SEG(gs);			\
	pr_reg[11] = regs->orig_rax;			\
	pr_reg[12] = regs->rip;				\
	pr_reg[13] = regs->cs;				\
	pr_reg[14] = regs->eflags;			\
	pr_reg[15] = regs->rsp;				\
	pr_reg[16] = regs->ss;

#define user user32

#define __ASM_X86_64_ELF_H 1
#define elf_read_implies_exec(ex, executable_stack)     (executable_stack != EXSTACK_DISABLE_X)
//#include <asm/ia32.h>
#include <linux/elf.h>

typedef struct user_i387_ia32_struct elf_fpregset_t;
typedef struct user32_fxsr_struct elf_fpxregset_t;


static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
{
	ELF_CORE_COPY_REGS((*elfregs), regs)
}

static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs)
{	
	struct pt_regs *pp = task_pt_regs(t);
	ELF_CORE_COPY_REGS((*elfregs), pp);
	/* fix wrong segments */ 
	(*elfregs)[7] = t->thread.ds; 
	(*elfregs)[9] = t->thread.fsindex; 
	(*elfregs)[10] = t->thread.gsindex; 
	(*elfregs)[8] = t->thread.es; 	
	return 1; 
}

static inline int 
elf_core_copy_task_fpregs(struct task_struct *tsk, struct pt_regs *regs, elf_fpregset_t *fpu)
{
	struct _fpstate_ia32 *fpstate = (void*)fpu; 
	mm_segment_t oldfs = get_fs();

	if (!tsk_used_math(tsk))
		return 0;
	if (!regs)
		regs = task_pt_regs(tsk);
	if (tsk == current)
		unlazy_fpu(tsk);
	set_fs(KERNEL_DS); 
	save_i387_ia32(tsk, fpstate, regs, 1);
	/* Correct for i386 bug. It puts the fop into the upper 16bits of 
	   the tag word (like FXSAVE), not into the fcs*/ 
	fpstate->cssel |= fpstate->tag & 0xffff0000; 
	set_fs(oldfs); 
	return 1; 
}

#define ELF_CORE_COPY_XFPREGS 1
static inline int 
elf_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu)
{
	struct pt_regs *regs = task_pt_regs(t);
	if (!tsk_used_math(t))
		return 0;
	if (t == current)
		unlazy_fpu(t); 
	memcpy(xfpu, &t->thread.i387.fxsave, sizeof(elf_fpxregset_t));
	xfpu->fcs = regs->cs; 
	xfpu->fos = t->thread.ds; /* right? */ 
	return 1;
}

#undef elf_check_arch
#define elf_check_arch(x) \
	((x)->e_machine == EM_386)

extern int force_personality32;

#define ELF_EXEC_PAGESIZE PAGE_SIZE
#define ELF_HWCAP (boot_cpu_data.x86_capability[0])
#define ELF_PLATFORM  ("i686")
#define SET_PERSONALITY(ex, ibcs2)			\
do {							\
	unsigned long new_flags = 0;				\
	if ((ex).e_ident[EI_CLASS] == ELFCLASS32)		\
		new_flags = _TIF_IA32;				\
	if ((current_thread_info()->flags & _TIF_IA32)		\
	    != new_flags)					\
		set_thread_flag(TIF_ABI_PENDING);		\
	else							\
		clear_thread_flag(TIF_ABI_PENDING);		\
	/* XXX This overwrites the user set personality */	\
	current->personality |= force_personality32;		\
} while (0)

/* Override some function names */
#define elf_format			elf32_format

#define init_elf_binfmt			init_elf32_binfmt
#define exit_elf_binfmt			exit_elf32_binfmt

#define load_elf_binary load_elf32_binary

#define ELF_PLAT_INIT(r, load_addr)	elf32_init(r)
#define setup_arg_pages(bprm, stack_top, exec_stack) \
	ia32_setup_arg_pages(bprm, stack_top, exec_stack)
int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack);

#undef start_thread
#define start_thread(regs,new_rip,new_rsp) do { \
	asm volatile("movl %0,%%fs" :: "r" (0)); \
	asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS)); \
	load_gs_index(0); \
	(regs)->rip = (new_rip); \
	(regs)->rsp = (new_rsp); \
	(regs)->eflags = 0x200; \
	(regs)->cs = __USER32_CS; \
	(regs)->ss = __USER32_DS; \
	set_fs(USER_DS); \
} while(0) 


#include <linux/module.h>

MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries."); 
MODULE_AUTHOR("Eric Youngdale, Andi Kleen");

#undef MODULE_DESCRIPTION
#undef MODULE_AUTHOR

#define elf_addr_t __u32

static void elf32_init(struct pt_regs *);

#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
#define arch_setup_additional_pages syscall32_setup_pages
extern int syscall32_setup_pages(struct linux_binprm *, int exstack);

#include "../../../fs/binfmt_elf.c" 

static void elf32_init(struct pt_regs *regs)
{
	struct task_struct *me = current; 
	regs->rdi = 0;
	regs->rsi = 0;
	regs->rdx = 0;
	regs->rcx = 0;
	regs->rax = 0;
	regs->rbx = 0; 
	regs->rbp = 0; 
	regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
		regs->r13 = regs->r14 = regs->r15 = 0; 
    me->thread.fs = 0; 
	me->thread.gs = 0;
	me->thread.fsindex = 0; 
	me->thread.gsindex = 0;
    me->thread.ds = __USER_DS; 
	me->thread.es = __USER_DS;
}

int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top,
			 int executable_stack)
{
	unsigned long stack_base;
	struct vm_area_struct *mpnt;
	struct mm_struct *mm = current->mm;
	int i, ret;

	stack_base = stack_top - MAX_ARG_PAGES * PAGE_SIZE;
	mm->arg_start = bprm->p + stack_base;

	bprm->p += stack_base;
	if (bprm->loader)
		bprm->loader += stack_base;
	bprm->exec += stack_base;

	mpnt = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
	if (!mpnt) 
		return -ENOMEM; 

	memset(mpnt, 0, sizeof(*mpnt));

	down_write(&mm->mmap_sem);
	{
		mpnt->vm_mm = mm;
		mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;
		mpnt->vm_end = stack_top;
		if (executable_stack == EXSTACK_ENABLE_X)
			mpnt->vm_flags = VM_STACK_FLAGS |  VM_EXEC;
		else if (executable_stack == EXSTACK_DISABLE_X)
			mpnt->vm_flags = VM_STACK_FLAGS & ~VM_EXEC;
		else
			mpnt->vm_flags = VM_STACK_FLAGS;
 		mpnt->vm_page_prot = (mpnt->vm_flags & VM_EXEC) ? 
 			PAGE_COPY_EXEC : PAGE_COPY;
		if ((ret = insert_vm_struct(mm, mpnt))) {
			up_write(&mm->mmap_sem);
			kmem_cache_free(vm_area_cachep, mpnt);
			return ret;
		}
		mm->stack_vm = mm->total_vm = vma_pages(mpnt);
	} 

	for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
		struct page *page = bprm->page[i];
		if (page) {
			bprm->page[i] = NULL;
			install_arg_page(mpnt, page, stack_base);
		}
		stack_base += PAGE_SIZE;
	}
	up_write(&mm->mmap_sem);
	
	return 0;
}
EXPORT_SYMBOL(ia32_setup_arg_pages);

#ifdef CONFIG_SYSCTL
/* Register vsyscall32 into the ABI table */
#include <linux/sysctl.h>

static ctl_table abi_table2[] = {
	{ 99, "vsyscall32", &sysctl_vsyscall32, sizeof(int), 0644, NULL,
	  proc_dointvec },
	{ 0, }
}; 

static ctl_table abi_root_table2[] = { 
	{ .ctl_name = CTL_ABI, .procname = "abi", .mode = 0555, 
	  .child = abi_table2 }, 
	{ 0 }, 
}; 

static __init int ia32_binfmt_init(void)
{ 
	register_sysctl_table(abi_root_table2, 1);
	return 0;
}
__initcall(ia32_binfmt_init);
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Written 2000,2002 by Andi Kleen.
	3	*
	4	* Loosely based on the sparc64 and IA64 32bit emulation loaders.
	5	* This tricks binfmt_elf.c into loading 32bit binaries using lots
	6	* of ugly preprocessor tricks. Talk about very very poor man's inheritance.
	7	*/
	8	#include <linux/types.h>
1da177e4 LT	9	#include <linux/stddef.h>
	10	#include <linux/rwsem.h>
	11	#include <linux/sched.h>
	12	#include <linux/compat.h>
	13	#include <linux/string.h>
	14	#include <linux/binfmts.h>
	15	#include <linux/mm.h>
	16	#include <linux/security.h>
	17
	18	#include <asm/segment.h>
	19	#include <asm/ptrace.h>
	20	#include <asm/processor.h>
	21	#include <asm/user32.h>
	22	#include <asm/sigcontext32.h>
	23	#include <asm/fpu32.h>
	24	#include <asm/i387.h>
	25	#include <asm/uaccess.h>
	26	#include <asm/ia32.h>
	27	#include <asm/vsyscall32.h>
	28
	29	#define ELF_NAME "elf/i386"
	30
	31	#define AT_SYSINFO 32
	32	#define AT_SYSINFO_EHDR 33
	33
	34	int sysctl_vsyscall32 = 1;
	35
	36	#define ARCH_DLINFO do { \
	37	if (sysctl_vsyscall32) { \
	38	NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \
	39	NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE); \
	40	} \
	41	} while(0)
	42
	43	struct file;
	44	struct elf_phdr;
	45
	46	#define IA32_EMULATOR 1
	47
84929801	48	#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000)
1da177e4 LT	49
	50	#undef ELF_ARCH
	51	#define ELF_ARCH EM_386
	52
	53	#undef ELF_CLASS
	54	#define ELF_CLASS ELFCLASS32
	55
	56	#define ELF_DATA ELFDATA2LSB
	57
	58	#define USE_ELF_CORE_DUMP 1
	59
e6fc99c6	60	/* Override elfcore.h */
1da177e4 LT	61	#define _LINUX_ELFCORE_H 1
	62	typedef unsigned int elf_greg_t;
	63
	64	#define ELF_NGREG (sizeof (struct user_regs_struct32) / sizeof(elf_greg_t))
	65	typedef elf_greg_t elf_gregset_t[ELF_NGREG];
	66
	67	/*
	68	* These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out
	69	* extra segments containing the vsyscall DSO contents. Dumping its
	70	* contents makes post-mortem fully interpretable later without matching up
	71	* the same kernel and hardware config to see what PC values meant.
	72	* Dumping its extra ELF program headers includes all the other information
	73	* a debugger needs to easily find how the vsyscall DSO was being used.
	74	*/
ec0063b4 SS	75	#define ELF_CORE_EXTRA_PHDRS (find_vma(current->mm, VSYSCALL32_BASE) ? \
ec0063b4 SS	76	(VSYSCALL32_EHDR->e_phnum) : 0)
1da177e4 LT	77	#define ELF_CORE_WRITE_EXTRA_PHDRS \
1da177e4 LT	78	do { \
ec0063b4 SS	79	if (find_vma(current->mm, VSYSCALL32_BASE)) { \
	80	const struct elf32_phdr *const vsyscall_phdrs = \
	81	(const struct elf32_phdr *) (VSYSCALL32_BASE \
	82	+ VSYSCALL32_EHDR->e_phoff);\
	83	int i; \
	84	Elf32_Off ofs = 0; \
	85	for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) { \
	86	struct elf32_phdr phdr = vsyscall_phdrs[i]; \
	87	if (phdr.p_type == PT_LOAD) { \
	88	BUG_ON(ofs != 0); \
	89	ofs = phdr.p_offset = offset; \
	90	phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz); \
	91	phdr.p_filesz = phdr.p_memsz; \
	92	offset += phdr.p_filesz; \
	93	} \
	94	else \
	95	phdr.p_offset += ofs; \
	96	phdr.p_paddr = 0; /* match other core phdrs */ \
	97	DUMP_WRITE(&phdr, sizeof(phdr)); \
1da177e4	98	} \
1da177e4 LT	99	} \
	100	} while (0)
	101	#define ELF_CORE_WRITE_EXTRA_DATA \
	102	do { \
ec0063b4 SS	103	if (find_vma(current->mm, VSYSCALL32_BASE)) { \
	104	const struct elf32_phdr *const vsyscall_phdrs = \
	105	(const struct elf32_phdr *) (VSYSCALL32_BASE \
	106	+ VSYSCALL32_EHDR->e_phoff); \
	107	int i; \
	108	for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) { \
	109	if (vsyscall_phdrs[i].p_type == PT_LOAD) \
	110	DUMP_WRITE((void *) (u64) vsyscall_phdrs[i].p_vaddr,\
	111	PAGE_ALIGN(vsyscall_phdrs[i].p_memsz)); \
	112	} \
1da177e4 LT	113	} \
	114	} while (0)
	115
	116	struct elf_siginfo
	117	{
	118	int si_signo; /* signal number */
	119	int si_code; /* extra code */
	120	int si_errno; /* errno */
	121	};
	122
	123	#define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0)
	124
	125	struct elf_prstatus
	126	{
	127	struct elf_siginfo pr_info; /* Info associated with signal */
	128	short pr_cursig; /* Current signal */
	129	unsigned int pr_sigpend; /* Set of pending signals */
	130	unsigned int pr_sighold; /* Set of held signals */
	131	pid_t pr_pid;
	132	pid_t pr_ppid;
	133	pid_t pr_pgrp;
	134	pid_t pr_sid;
	135	struct compat_timeval pr_utime; /* User time */
	136	struct compat_timeval pr_stime; /* System time */
	137	struct compat_timeval pr_cutime; /* Cumulative user time */
	138	struct compat_timeval pr_cstime; /* Cumulative system time */
	139	elf_gregset_t pr_reg; /* GP registers */
	140	int pr_fpvalid; /* True if math co-processor being used. */
	141	};
	142
	143	#define ELF_PRARGSZ (80) /* Number of chars for args */
	144
	145	struct elf_prpsinfo
	146	{
	147	char pr_state; /* numeric process state */
	148	char pr_sname; /* char for pr_state */
	149	char pr_zomb; /* zombie */
	150	char pr_nice; /* nice val */
	151	unsigned int pr_flag; /* flags */
	152	__u16 pr_uid;
	153	__u16 pr_gid;
	154	pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
	155	/* Lots missing */
	156	char pr_fname[16]; /* filename of executable */
	157	char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
	158	};
	159
	160	#define __STR(x) #x
	161	#define STR(x) __STR(x)
	162
	163	#define _GET_SEG(x) \
	164	({ __u32 seg; asm("movl %%" STR(x) ",%0" : "=r"(seg)); seg; })
	165
	166	/* Assumes current==process to be dumped */
	167	#define ELF_CORE_COPY_REGS(pr_reg, regs) \
	168	pr_reg[0] = regs->rbx; \
	169	pr_reg[1] = regs->rcx; \
	170	pr_reg[2] = regs->rdx; \
	171	pr_reg[3] = regs->rsi; \
	172	pr_reg[4] = regs->rdi; \
	173	pr_reg[5] = regs->rbp; \
	174	pr_reg[6] = regs->rax; \
	175	pr_reg[7] = _GET_SEG(ds); \
	176	pr_reg[8] = _GET_SEG(es); \
177	pr_reg[9] = _GET_SEG(fs); \
178	pr_reg[10] = _GET_SEG(gs); \
179	pr_reg[11] = regs->orig_rax; \
180	pr_reg[12] = regs->rip; \
181	pr_reg[13] = regs->cs; \
182	pr_reg[14] = regs->eflags; \
183	pr_reg[15] = regs->rsp; \
184	pr_reg[16] = regs->ss;
185
186	#define user user32
187
188	#define __ASM_X86_64_ELF_H 1
3391c22e	189	#define elf_read_implies_exec(ex, executable_stack) (executable_stack != EXSTACK_DISABLE_X)
1da177e4 LT	190	//#include <asm/ia32.h>
	191	#include <linux/elf.h>
	192
	193	typedef struct user_i387_ia32_struct elf_fpregset_t;
	194	typedef struct user32_fxsr_struct elf_fpxregset_t;
	195
	196
	197	static inline void elf_core_copy_regs(elf_gregset_t elfregs, struct pt_regs regs)
	198	{
	199	ELF_CORE_COPY_REGS((*elfregs), regs)
	200	}
	201
	202	static inline int elf_core_copy_task_regs(struct task_struct t, elf_gregset_t elfregs)
	203	{
bb049232	204	struct pt_regs *pp = task_pt_regs(t);
1da177e4 LT	205	ELF_CORE_COPY_REGS((*elfregs), pp);
	206	/* fix wrong segments */
	207	(*elfregs)[7] = t->thread.ds;
	208	(*elfregs)[9] = t->thread.fsindex;
	209	(*elfregs)[10] = t->thread.gsindex;
	210	(*elfregs)[8] = t->thread.es;
	211	return 1;
	212	}
	213
	214	static inline int
	215	elf_core_copy_task_fpregs(struct task_struct tsk, struct pt_regs regs, elf_fpregset_t *fpu)
	216	{
	217	struct _fpstate_ia32 fpstate = (void)fpu;
	218	mm_segment_t oldfs = get_fs();
	219
	220	if (!tsk_used_math(tsk))
	221	return 0;
	222	if (!regs)
bb049232	223	regs = task_pt_regs(tsk);
1da177e4 LT	224	if (tsk == current)
	225	unlazy_fpu(tsk);
	226	set_fs(KERNEL_DS);
	227	save_i387_ia32(tsk, fpstate, regs, 1);
	228	/* Correct for i386 bug. It puts the fop into the upper 16bits of
	229	the tag word (like FXSAVE), not into the fcs*/
	230	fpstate->cssel \|= fpstate->tag & 0xffff0000;
	231	set_fs(oldfs);
	232	return 1;
	233	}
	234
	235	#define ELF_CORE_COPY_XFPREGS 1
	236	static inline int
	237	elf_core_copy_task_xfpregs(struct task_struct t, elf_fpxregset_t xfpu)
	238	{
bb049232	239	struct pt_regs *regs = task_pt_regs(t);
1da177e4 LT	240	if (!tsk_used_math(t))
	241	return 0;
	242	if (t == current)
	243	unlazy_fpu(t);
	244	memcpy(xfpu, &t->thread.i387.fxsave, sizeof(elf_fpxregset_t));
	245	xfpu->fcs = regs->cs;
	246	xfpu->fos = t->thread.ds; /* right? */
	247	return 1;
	248	}
	249
	250	#undef elf_check_arch
	251	#define elf_check_arch(x) \
	252	((x)->e_machine == EM_386)
	253
	254	extern int force_personality32;
	255
	256	#define ELF_EXEC_PAGESIZE PAGE_SIZE
	257	#define ELF_HWCAP (boot_cpu_data.x86_capability[0])
	258	#define ELF_PLATFORM ("i686")
	259	#define SET_PERSONALITY(ex, ibcs2) \
	260	do { \
	261	unsigned long new_flags = 0; \
	262	if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
	263	new_flags = _TIF_IA32; \
	264	if ((current_thread_info()->flags & _TIF_IA32) \
	265	!= new_flags) \
	266	set_thread_flag(TIF_ABI_PENDING); \
	267	else \
	268	clear_thread_flag(TIF_ABI_PENDING); \
	269	/* XXX This overwrites the user set personality */ \
	270	current->personality \|= force_personality32; \
	271	} while (0)
	272
	273	/* Override some function names */
	274	#define elf_format elf32_format
	275
	276	#define init_elf_binfmt init_elf32_binfmt
	277	#define exit_elf_binfmt exit_elf32_binfmt
	278
	279	#define load_elf_binary load_elf32_binary
	280
	281	#define ELF_PLAT_INIT(r, load_addr) elf32_init(r)
	282	#define setup_arg_pages(bprm, stack_top, exec_stack) \
	283	ia32_setup_arg_pages(bprm, stack_top, exec_stack)
	284	int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack);
	285
	286	#undef start_thread
	287	#define start_thread(regs,new_rip,new_rsp) do { \
	288	asm volatile("movl %0,%%fs" :: "r" (0)); \
	289	asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS)); \
	290	load_gs_index(0); \
	291	(regs)->rip = (new_rip); \
	292	(regs)->rsp = (new_rsp); \
	293	(regs)->eflags = 0x200; \
	294	(regs)->cs = __USER32_CS; \
	295	(regs)->ss = __USER32_DS; \
	296	set_fs(USER_DS); \
	297	} while(0)
	298
	299
1da177e4 LT	300	#include <linux/module.h>
	301
	302	MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries.");
	303	MODULE_AUTHOR("Eric Youngdale, Andi Kleen");
	304
	305	#undef MODULE_DESCRIPTION
	306	#undef MODULE_AUTHOR
	307
	308	#define elf_addr_t __u32
	309
1da177e4 LT	310	static void elf32_init(struct pt_regs *);
1da177e4 LT	311
1e014410 AK	312	#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
	313	#define arch_setup_additional_pages syscall32_setup_pages
	314	extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
	315
1da177e4 LT	316	#include "../../../fs/binfmt_elf.c"
	317
	318	static void elf32_init(struct pt_regs *regs)
	319	{
	320	struct task_struct *me = current;
	321	regs->rdi = 0;
	322	regs->rsi = 0;
	323	regs->rdx = 0;
	324	regs->rcx = 0;
	325	regs->rax = 0;
	326	regs->rbx = 0;
	327	regs->rbp = 0;
	328	regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
	329	regs->r13 = regs->r14 = regs->r15 = 0;
	330	me->thread.fs = 0;
	331	me->thread.gs = 0;
	332	me->thread.fsindex = 0;
	333	me->thread.gsindex = 0;
	334	me->thread.ds = __USER_DS;
	335	me->thread.es = __USER_DS;
	336	}
	337
ea0be473 AK	338	int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top,
ea0be473 AK	339	int executable_stack)
1da177e4 LT	340	{
	341	unsigned long stack_base;
	342	struct vm_area_struct *mpnt;
	343	struct mm_struct *mm = current->mm;
	344	int i, ret;
	345
6ae53cd4	346	stack_base = stack_top - MAX_ARG_PAGES * PAGE_SIZE;
1da177e4 LT	347	mm->arg_start = bprm->p + stack_base;
	348
	349	bprm->p += stack_base;
	350	if (bprm->loader)
	351	bprm->loader += stack_base;
	352	bprm->exec += stack_base;
	353
e94b1766	354	mpnt = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
1da177e4 LT	355	if (!mpnt)
1da177e4 LT	356	return -ENOMEM;
1da177e4 LT	357
	358	memset(mpnt, 0, sizeof(*mpnt));
	359
	360	down_write(&mm->mmap_sem);
	361	{
	362	mpnt->vm_mm = mm;
	363	mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;
6ae53cd4	364	mpnt->vm_end = stack_top;
1da177e4 LT	365	if (executable_stack == EXSTACK_ENABLE_X)
	366	mpnt->vm_flags = VM_STACK_FLAGS \| VM_EXEC;
	367	else if (executable_stack == EXSTACK_DISABLE_X)
	368	mpnt->vm_flags = VM_STACK_FLAGS & ~VM_EXEC;
	369	else
	370	mpnt->vm_flags = VM_STACK_FLAGS;
	371	mpnt->vm_page_prot = (mpnt->vm_flags & VM_EXEC) ?
	372	PAGE_COPY_EXEC : PAGE_COPY;
	373	if ((ret = insert_vm_struct(mm, mpnt))) {
	374	up_write(&mm->mmap_sem);
	375	kmem_cache_free(vm_area_cachep, mpnt);
	376	return ret;
	377	}
	378	mm->stack_vm = mm->total_vm = vma_pages(mpnt);
	379	}
	380
	381	for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
	382	struct page *page = bprm->page[i];
	383	if (page) {
	384	bprm->page[i] = NULL;
	385	install_arg_page(mpnt, page, stack_base);
	386	}
	387	stack_base += PAGE_SIZE;
	388	}
	389	up_write(&mm->mmap_sem);
	390
	391	return 0;
	392	}
ea0be473	393	EXPORT_SYMBOL(ia32_setup_arg_pages);
1da177e4	394
1da177e4 LT	395	#ifdef CONFIG_SYSCTL
	396	/* Register vsyscall32 into the ABI table */
	397	#include <linux/sysctl.h>
	398
	399	static ctl_table abi_table2[] = {
	400	{ 99, "vsyscall32", &sysctl_vsyscall32, sizeof(int), 0644, NULL,
	401	proc_dointvec },
	402	{ 0, }
	403	};
	404
	405	static ctl_table abi_root_table2[] = {
	406	{ .ctl_name = CTL_ABI, .procname = "abi", .mode = 0555,
	407	.child = abi_table2 },
	408	{ 0 },
	409	};
	410
	411	static __init int ia32_binfmt_init(void)
	412	{
	413	register_sysctl_table(abi_root_table2, 1);
	414	return 0;
	415	}
	416	__initcall(ia32_binfmt_init);
	417	#endif