[GitHub/mt8127/android_kernel_alcatel_ttab.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];

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

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

	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[] = {
	{
		.ctl_name	= 99,
		.procname	= "vsyscall32",
		.data		= &sysctl_vsyscall32,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
	{}
};

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

static __init int ia32_binfmt_init(void)
{ 
	register_sysctl_table(abi_root_table2);
	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
1da177e4 LT	67	struct elf_siginfo
	68	{
	69	int si_signo; /* signal number */
	70	int si_code; /* extra code */
	71	int si_errno; /* errno */
	72	};
	73
	74	#define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0)
	75
	76	struct elf_prstatus
	77	{
	78	struct elf_siginfo pr_info; /* Info associated with signal */
	79	short pr_cursig; /* Current signal */
	80	unsigned int pr_sigpend; /* Set of pending signals */
	81	unsigned int pr_sighold; /* Set of held signals */
	82	pid_t pr_pid;
	83	pid_t pr_ppid;
	84	pid_t pr_pgrp;
	85	pid_t pr_sid;
	86	struct compat_timeval pr_utime; /* User time */
	87	struct compat_timeval pr_stime; /* System time */
	88	struct compat_timeval pr_cutime; /* Cumulative user time */
	89	struct compat_timeval pr_cstime; /* Cumulative system time */
	90	elf_gregset_t pr_reg; /* GP registers */
	91	int pr_fpvalid; /* True if math co-processor being used. */
	92	};
	93
	94	#define ELF_PRARGSZ (80) /* Number of chars for args */
	95
	96	struct elf_prpsinfo
	97	{
	98	char pr_state; /* numeric process state */
	99	char pr_sname; /* char for pr_state */
	100	char pr_zomb; /* zombie */
	101	char pr_nice; /* nice val */
	102	unsigned int pr_flag; /* flags */
	103	__u16 pr_uid;
	104	__u16 pr_gid;
	105	pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
	106	/* Lots missing */
	107	char pr_fname[16]; /* filename of executable */
	108	char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
	109	};
	110
	111	#define __STR(x) #x
	112	#define STR(x) __STR(x)
	113
	114	#define _GET_SEG(x) \
	115	({ __u32 seg; asm("movl %%" STR(x) ",%0" : "=r"(seg)); seg; })
	116
	117	/* Assumes current==process to be dumped */
	118	#define ELF_CORE_COPY_REGS(pr_reg, regs) \
	119	pr_reg[0] = regs->rbx; \
	120	pr_reg[1] = regs->rcx; \
	121	pr_reg[2] = regs->rdx; \
	122	pr_reg[3] = regs->rsi; \
	123	pr_reg[4] = regs->rdi; \
	124	pr_reg[5] = regs->rbp; \
	125	pr_reg[6] = regs->rax; \
	126	pr_reg[7] = _GET_SEG(ds); \
	127	pr_reg[8] = _GET_SEG(es); \
	128	pr_reg[9] = _GET_SEG(fs); \
	129	pr_reg[10] = _GET_SEG(gs); \
	130	pr_reg[11] = regs->orig_rax; \
131	pr_reg[12] = regs->rip; \
132	pr_reg[13] = regs->cs; \
133	pr_reg[14] = regs->eflags; \
134	pr_reg[15] = regs->rsp; \
135	pr_reg[16] = regs->ss;
136
137	#define user user32
138
139	#define __ASM_X86_64_ELF_H 1
3391c22e	140	#define elf_read_implies_exec(ex, executable_stack) (executable_stack != EXSTACK_DISABLE_X)
1da177e4 LT	141	//#include <asm/ia32.h>
	142	#include <linux/elf.h>
	143
	144	typedef struct user_i387_ia32_struct elf_fpregset_t;
	145	typedef struct user32_fxsr_struct elf_fpxregset_t;
	146
	147
	148	static inline void elf_core_copy_regs(elf_gregset_t elfregs, struct pt_regs regs)
	149	{
	150	ELF_CORE_COPY_REGS((*elfregs), regs)
	151	}
	152
	153	static inline int elf_core_copy_task_regs(struct task_struct t, elf_gregset_t elfregs)
	154	{
bb049232	155	struct pt_regs *pp = task_pt_regs(t);
1da177e4 LT	156	ELF_CORE_COPY_REGS((*elfregs), pp);
	157	/* fix wrong segments */
	158	(*elfregs)[7] = t->thread.ds;
	159	(*elfregs)[9] = t->thread.fsindex;
	160	(*elfregs)[10] = t->thread.gsindex;
	161	(*elfregs)[8] = t->thread.es;
	162	return 1;
	163	}
	164
	165	static inline int
	166	elf_core_copy_task_fpregs(struct task_struct tsk, struct pt_regs regs, elf_fpregset_t *fpu)
	167	{
	168	struct _fpstate_ia32 fpstate = (void)fpu;
	169	mm_segment_t oldfs = get_fs();
	170
	171	if (!tsk_used_math(tsk))
	172	return 0;
	173	if (!regs)
bb049232	174	regs = task_pt_regs(tsk);
1da177e4 LT	175	if (tsk == current)
	176	unlazy_fpu(tsk);
	177	set_fs(KERNEL_DS);
	178	save_i387_ia32(tsk, fpstate, regs, 1);
	179	/* Correct for i386 bug. It puts the fop into the upper 16bits of
	180	the tag word (like FXSAVE), not into the fcs*/
	181	fpstate->cssel \|= fpstate->tag & 0xffff0000;
	182	set_fs(oldfs);
	183	return 1;
	184	}
	185
	186	#define ELF_CORE_COPY_XFPREGS 1
	187	static inline int
	188	elf_core_copy_task_xfpregs(struct task_struct t, elf_fpxregset_t xfpu)
	189	{
bb049232	190	struct pt_regs *regs = task_pt_regs(t);
1da177e4 LT	191	if (!tsk_used_math(t))
	192	return 0;
	193	if (t == current)
	194	unlazy_fpu(t);
	195	memcpy(xfpu, &t->thread.i387.fxsave, sizeof(elf_fpxregset_t));
	196	xfpu->fcs = regs->cs;
	197	xfpu->fos = t->thread.ds; /* right? */
	198	return 1;
	199	}
	200
	201	#undef elf_check_arch
	202	#define elf_check_arch(x) \
	203	((x)->e_machine == EM_386)
	204
	205	extern int force_personality32;
	206
	207	#define ELF_EXEC_PAGESIZE PAGE_SIZE
	208	#define ELF_HWCAP (boot_cpu_data.x86_capability[0])
	209	#define ELF_PLATFORM ("i686")
	210	#define SET_PERSONALITY(ex, ibcs2) \
	211	do { \
	212	unsigned long new_flags = 0; \
	213	if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
	214	new_flags = _TIF_IA32; \
	215	if ((current_thread_info()->flags & _TIF_IA32) \
	216	!= new_flags) \
	217	set_thread_flag(TIF_ABI_PENDING); \
	218	else \
	219	clear_thread_flag(TIF_ABI_PENDING); \
	220	/* XXX This overwrites the user set personality */ \
	221	current->personality \|= force_personality32; \
	222	} while (0)
	223
	224	/* Override some function names */
	225	#define elf_format elf32_format
	226
	227	#define init_elf_binfmt init_elf32_binfmt
	228	#define exit_elf_binfmt exit_elf32_binfmt
	229
	230	#define load_elf_binary load_elf32_binary
	231
	232	#define ELF_PLAT_INIT(r, load_addr) elf32_init(r)
	233	#define setup_arg_pages(bprm, stack_top, exec_stack) \
	234	ia32_setup_arg_pages(bprm, stack_top, exec_stack)
	235	int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack);
	236
	237	#undef start_thread
	238	#define start_thread(regs,new_rip,new_rsp) do { \
	239	asm volatile("movl %0,%%fs" :: "r" (0)); \
	240	asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS)); \
	241	load_gs_index(0); \
	242	(regs)->rip = (new_rip); \
	243	(regs)->rsp = (new_rsp); \
	244	(regs)->eflags = 0x200; \
	245	(regs)->cs = __USER32_CS; \
	246	(regs)->ss = __USER32_DS; \
	247	set_fs(USER_DS); \
	248	} while(0)
	249
	250
1da177e4 LT	251	#include <linux/module.h>
	252
	253	MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries.");
	254	MODULE_AUTHOR("Eric Youngdale, Andi Kleen");
	255
	256	#undef MODULE_DESCRIPTION
	257	#undef MODULE_AUTHOR
	258
1da177e4 LT	259	static void elf32_init(struct pt_regs *);
1da177e4 LT	260
1e014410 AK	261	#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
	262	#define arch_setup_additional_pages syscall32_setup_pages
	263	extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
	264
1da177e4 LT	265	#include "../../../fs/binfmt_elf.c"
	266
	267	static void elf32_init(struct pt_regs *regs)
	268	{
	269	struct task_struct *me = current;
	270	regs->rdi = 0;
	271	regs->rsi = 0;
	272	regs->rdx = 0;
	273	regs->rcx = 0;
	274	regs->rax = 0;
	275	regs->rbx = 0;
	276	regs->rbp = 0;
	277	regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
	278	regs->r13 = regs->r14 = regs->r15 = 0;
	279	me->thread.fs = 0;
	280	me->thread.gs = 0;
	281	me->thread.fsindex = 0;
	282	me->thread.gsindex = 0;
	283	me->thread.ds = __USER_DS;
	284	me->thread.es = __USER_DS;
	285	}
	286
ea0be473 AK	287	int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top,
ea0be473 AK	288	int executable_stack)
1da177e4 LT	289	{
	290	unsigned long stack_base;
	291	struct vm_area_struct *mpnt;
	292	struct mm_struct *mm = current->mm;
	293	int i, ret;
	294
6ae53cd4	295	stack_base = stack_top - MAX_ARG_PAGES * PAGE_SIZE;
1da177e4 LT	296	mm->arg_start = bprm->p + stack_base;
	297
	298	bprm->p += stack_base;
	299	if (bprm->loader)
	300	bprm->loader += stack_base;
	301	bprm->exec += stack_base;
	302
c3762229	303	mpnt = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
1da177e4 LT	304	if (!mpnt)
1da177e4 LT	305	return -ENOMEM;
1da177e4	306
1da177e4 LT	307	down_write(&mm->mmap_sem);
	308	{
	309	mpnt->vm_mm = mm;
	310	mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;
6ae53cd4	311	mpnt->vm_end = stack_top;
1da177e4 LT	312	if (executable_stack == EXSTACK_ENABLE_X)
	313	mpnt->vm_flags = VM_STACK_FLAGS \| VM_EXEC;
	314	else if (executable_stack == EXSTACK_DISABLE_X)
	315	mpnt->vm_flags = VM_STACK_FLAGS & ~VM_EXEC;
	316	else
	317	mpnt->vm_flags = VM_STACK_FLAGS;
	318	mpnt->vm_page_prot = (mpnt->vm_flags & VM_EXEC) ?
	319	PAGE_COPY_EXEC : PAGE_COPY;
	320	if ((ret = insert_vm_struct(mm, mpnt))) {
	321	up_write(&mm->mmap_sem);
	322	kmem_cache_free(vm_area_cachep, mpnt);
	323	return ret;
	324	}
	325	mm->stack_vm = mm->total_vm = vma_pages(mpnt);
	326	}
	327
	328	for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
	329	struct page *page = bprm->page[i];
	330	if (page) {
	331	bprm->page[i] = NULL;
	332	install_arg_page(mpnt, page, stack_base);
	333	}
	334	stack_base += PAGE_SIZE;
	335	}
	336	up_write(&mm->mmap_sem);
	337
	338	return 0;
	339	}
ea0be473	340	EXPORT_SYMBOL(ia32_setup_arg_pages);
1da177e4	341
1da177e4 LT	342	#ifdef CONFIG_SYSCTL
	343	/* Register vsyscall32 into the ABI table */
	344	#include <linux/sysctl.h>
	345
	346	static ctl_table abi_table2[] = {
306421f3 EB	347	{
	348	.ctl_name = 99,
	349	.procname = "vsyscall32",
	350	.data = &sysctl_vsyscall32,
	351	.maxlen = sizeof(int),
	352	.mode = 0644,
	353	.proc_handler = proc_dointvec
	354	},
	355	{}
	356	};
	357
	358	static ctl_table abi_root_table2[] = {
	359	{
	360	.ctl_name = CTL_ABI,
	361	.procname = "abi",
	362	.mode = 0555,
	363	.child = abi_table2
	364	},
	365	{}
	366	};
1da177e4 LT	367
	368	static __init int ia32_binfmt_init(void)
	369	{
0b4d4147	370	register_sysctl_table(abi_root_table2);
1da177e4 LT	371	return 0;
	372	}
	373	__initcall(ia32_binfmt_init);
	374	#endif