arch/x86/ia32/ia32_signal.c - kernel/quantenna - Git at Google

 /*
  *  linux/arch/x86_64/ia32/ia32_signal.c
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
  *
  *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
  *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
  *  2000-12-*   x86-64 compatibility mode signal handling by Andi Kleen
  */

 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/wait.h>
 #include <linux/unistd.h>
 #include <linux/stddef.h>
 #include <linux/personality.h>
 #include <linux/compat.h>
 #include <linux/binfmts.h>
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
 #include <asm/fpu/internal.h>
 #include <asm/fpu/signal.h>
 #include <asm/ptrace.h>
 #include <asm/ia32_unistd.h>
 #include <asm/user32.h>
 #include <uapi/asm/sigcontext.h>
 #include <asm/proto.h>
 #include <asm/vdso.h>
 #include <asm/sigframe.h>
 #include <asm/sighandling.h>
 #include <asm/sys_ia32.h>
 #include <asm/smap.h>

 /*
  * Do a signal return; undo the signal stack.
  */
 #define loadsegment_gs(v)	load_gs_index(v)
 #define loadsegment_fs(v)	loadsegment(fs, v)
 #define loadsegment_ds(v)	loadsegment(ds, v)
 #define loadsegment_es(v)	loadsegment(es, v)

 #define get_user_seg(seg)	({ unsigned int v; savesegment(seg, v); v; })
 #define set_user_seg(seg, v)	loadsegment_##seg(v)

 #define COPY(x)			{		\
 	get_user_ex(regs->x, &sc->x);		\
 }

 #define GET_SEG(seg)		({			\
 	unsigned short tmp;				\
 	get_user_ex(tmp, &sc->seg);			\
 	tmp;						\
 })

 #define COPY_SEG_CPL3(seg)	do {			\
 	regs->seg = GET_SEG(seg) | 3;			\
 } while (0)

 #define RELOAD_SEG(seg)		{		\
 	unsigned int pre = GET_SEG(seg);	\
 	unsigned int cur = get_user_seg(seg);	\
 	pre |= 3;				\
 	if (pre != cur)				\
 		set_user_seg(seg, pre);		\
 }

 static int ia32_restore_sigcontext(struct pt_regs *regs,
 				   struct sigcontext_32 __user *sc)
 {
 	unsigned int tmpflags, err = 0;
 	void __user *buf;
 	u32 tmp;

 	/* Always make any pending restarted system calls return -EINTR */
 	current->restart_block.fn = do_no_restart_syscall;

 	get_user_try {
 		/*
 		 * Reload fs and gs if they have changed in the signal
 		 * handler.  This does not handle long fs/gs base changes in
 		 * the handler, but does not clobber them at least in the
 		 * normal case.
 		 */
 		RELOAD_SEG(gs);
 		RELOAD_SEG(fs);
 		RELOAD_SEG(ds);
 		RELOAD_SEG(es);

 		COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
 		COPY(dx); COPY(cx); COPY(ip); COPY(ax);
 		/* Don't touch extended registers */

 		COPY_SEG_CPL3(cs);
 		COPY_SEG_CPL3(ss);

 		get_user_ex(tmpflags, &sc->flags);
 		regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
 		/* disable syscall checks */
 		regs->orig_ax = -1;

 		get_user_ex(tmp, &sc->fpstate);
 		buf = compat_ptr(tmp);
 	} get_user_catch(err);

 	err |= fpu__restore_sig(buf, 1);

 	force_iret();

 	return err;
 }

 asmlinkage long sys32_sigreturn(void)
 {
 	struct pt_regs *regs = current_pt_regs();
 	struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(regs->sp-8);
 	sigset_t set;

 	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
 		goto badframe;
 	if (__get_user(set.sig[0], &frame->sc.oldmask)
 	    || (_COMPAT_NSIG_WORDS > 1
 		&& __copy_from_user((((char *) &set.sig) + 4),
 				    &frame->extramask,
 				    sizeof(frame->extramask))))
 		goto badframe;

 	set_current_blocked(&set);

 	if (ia32_restore_sigcontext(regs, &frame->sc))
 		goto badframe;
 	return regs->ax;

 badframe:
 	signal_fault(regs, frame, "32bit sigreturn");
 	return 0;
 }

 asmlinkage long sys32_rt_sigreturn(void)
 {
 	struct pt_regs *regs = current_pt_regs();
 	struct rt_sigframe_ia32 __user *frame;
 	sigset_t set;

 	frame = (struct rt_sigframe_ia32 __user *)(regs->sp - 4);

 	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
 		goto badframe;
 	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
 		goto badframe;

 	set_current_blocked(&set);

 	if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext))
 		goto badframe;

 	if (compat_restore_altstack(&frame->uc.uc_stack))
 		goto badframe;

 	return regs->ax;

 badframe:
 	signal_fault(regs, frame, "32bit rt sigreturn");
 	return 0;
 }

 /*
  * Set up a signal frame.
  */

 static int ia32_setup_sigcontext(struct sigcontext_32 __user *sc,
 				 void __user *fpstate,
 				 struct pt_regs *regs, unsigned int mask)
 {
 	int err = 0;

 	put_user_try {
 		put_user_ex(get_user_seg(gs), (unsigned int __user *)&sc->gs);
 		put_user_ex(get_user_seg(fs), (unsigned int __user *)&sc->fs);
 		put_user_ex(get_user_seg(ds), (unsigned int __user *)&sc->ds);
 		put_user_ex(get_user_seg(es), (unsigned int __user *)&sc->es);

 		put_user_ex(regs->di, &sc->di);
 		put_user_ex(regs->si, &sc->si);
 		put_user_ex(regs->bp, &sc->bp);
 		put_user_ex(regs->sp, &sc->sp);
 		put_user_ex(regs->bx, &sc->bx);
 		put_user_ex(regs->dx, &sc->dx);
 		put_user_ex(regs->cx, &sc->cx);
 		put_user_ex(regs->ax, &sc->ax);
 		put_user_ex(current->thread.trap_nr, &sc->trapno);
 		put_user_ex(current->thread.error_code, &sc->err);
 		put_user_ex(regs->ip, &sc->ip);
 		put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
 		put_user_ex(regs->flags, &sc->flags);
 		put_user_ex(regs->sp, &sc->sp_at_signal);
 		put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);

 		put_user_ex(ptr_to_compat(fpstate), &sc->fpstate);

 		/* non-iBCS2 extensions.. */
 		put_user_ex(mask, &sc->oldmask);
 		put_user_ex(current->thread.cr2, &sc->cr2);
 	} put_user_catch(err);

 	return err;
 }

 /*
  * Determine which stack to use..
  */
 static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
 				 size_t frame_size,
 				 void __user **fpstate)
 {
 	struct fpu *fpu = &current->thread.fpu;
 	unsigned long sp;

 	/* Default to using normal stack */
 	sp = regs->sp;

 	/* This is the X/Open sanctioned signal stack switching.  */
 	if (ksig->ka.sa.sa_flags & SA_ONSTACK)
 		sp = sigsp(sp, ksig);
 	/* This is the legacy signal stack switching. */
 	else if ((regs->ss & 0xffff) != __USER32_DS &&
 		!(ksig->ka.sa.sa_flags & SA_RESTORER) &&
 		 ksig->ka.sa.sa_restorer)
 		sp = (unsigned long) ksig->ka.sa.sa_restorer;

 	if (fpu->fpstate_active) {
 		unsigned long fx_aligned, math_size;

 		sp = fpu__alloc_mathframe(sp, 1, &fx_aligned, &math_size);
 		*fpstate = (struct _fpstate_32 __user *) sp;
 		if (copy_fpstate_to_sigframe(*fpstate, (void __user *)fx_aligned,
 				    math_size) < 0)
 			return (void __user *) -1L;
 	}

 	sp -= frame_size;
 	/* Align the stack pointer according to the i386 ABI,
 	 * i.e. so that on function entry ((sp + 4) & 15) == 0. */
 	sp = ((sp + 4) & -16ul) - 4;
 	return (void __user *) sp;
 }

 int ia32_setup_frame(int sig, struct ksignal *ksig,
 		     compat_sigset_t *set, struct pt_regs *regs)
 {
 	struct sigframe_ia32 __user *frame;
 	void __user *restorer;
 	int err = 0;
 	void __user *fpstate = NULL;

 	/* copy_to_user optimizes that into a single 8 byte store */
 	static const struct {
 		u16 poplmovl;
 		u32 val;
 		u16 int80;
 	} __attribute__((packed)) code = {
 		0xb858,		 /* popl %eax ; movl $...,%eax */
 		__NR_ia32_sigreturn,
 		0x80cd,		/* int $0x80 */
 	};

 	frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);

 	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 		return -EFAULT;

 	if (__put_user(sig, &frame->sig))
 		return -EFAULT;

 	if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
 		return -EFAULT;

 	if (_COMPAT_NSIG_WORDS > 1) {
 		if (__copy_to_user(frame->extramask, &set->sig[1],
 				   sizeof(frame->extramask)))
 			return -EFAULT;
 	}

 	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
 		restorer = ksig->ka.sa.sa_restorer;
 	} else {
 		/* Return stub is in 32bit vsyscall page */
 		if (current->mm->context.vdso)
 			restorer = current->mm->context.vdso +
 				vdso_image_32.sym___kernel_sigreturn;
 		else
 			restorer = &frame->retcode;
 	}

 	put_user_try {
 		put_user_ex(ptr_to_compat(restorer), &frame->pretcode);

 		/*
 		 * These are actually not used anymore, but left because some
 		 * gdb versions depend on them as a marker.
 		 */
 		put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode);
 	} put_user_catch(err);

 	if (err)
 		return -EFAULT;

 	/* Set up registers for signal handler */
 	regs->sp = (unsigned long) frame;
 	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;

 	/* Make -mregparm=3 work */
 	regs->ax = sig;
 	regs->dx = 0;
 	regs->cx = 0;

 	loadsegment(ds, __USER32_DS);
 	loadsegment(es, __USER32_DS);

 	regs->cs = __USER32_CS;
 	regs->ss = __USER32_DS;

 	return 0;
 }

 int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
 			compat_sigset_t *set, struct pt_regs *regs)
 {
 	struct rt_sigframe_ia32 __user *frame;
 	void __user *restorer;
 	int err = 0;
 	void __user *fpstate = NULL;

 	/* __copy_to_user optimizes that into a single 8 byte store */
 	static const struct {
 		u8 movl;
 		u32 val;
 		u16 int80;
 		u8  pad;
 	} __attribute__((packed)) code = {
 		0xb8,
 		__NR_ia32_rt_sigreturn,
 		0x80cd,
 		0,
 	};

 	frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);

 	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 		return -EFAULT;

 	put_user_try {
 		put_user_ex(sig, &frame->sig);
 		put_user_ex(ptr_to_compat(&frame->info), &frame->pinfo);
 		put_user_ex(ptr_to_compat(&frame->uc), &frame->puc);

 		/* Create the ucontext.  */
 		if (boot_cpu_has(X86_FEATURE_XSAVE))
 			put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
 		else
 			put_user_ex(0, &frame->uc.uc_flags);
 		put_user_ex(0, &frame->uc.uc_link);
 		compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);

 		if (ksig->ka.sa.sa_flags & SA_RESTORER)
 			restorer = ksig->ka.sa.sa_restorer;
 		else
 			restorer = current->mm->context.vdso +
 				vdso_image_32.sym___kernel_rt_sigreturn;
 		put_user_ex(ptr_to_compat(restorer), &frame->pretcode);

 		/*
 		 * Not actually used anymore, but left because some gdb
 		 * versions need it.
 		 */
 		put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode);
 	} put_user_catch(err);

 	err |= copy_siginfo_to_user32(&frame->info, &ksig->info);
 	err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
 				     regs, set->sig[0]);
 	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));

 	if (err)
 		return -EFAULT;

 	/* Set up registers for signal handler */
 	regs->sp = (unsigned long) frame;
 	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;

 	/* Make -mregparm=3 work */
 	regs->ax = sig;
 	regs->dx = (unsigned long) &frame->info;
 	regs->cx = (unsigned long) &frame->uc;

 	loadsegment(ds, __USER32_DS);
 	loadsegment(es, __USER32_DS);

 	regs->cs = __USER32_CS;
 	regs->ss = __USER32_DS;

 	return 0;
 }
	/*
	* linux/arch/x86_64/ia32/ia32_signal.c
	*
	* Copyright (C) 1991, 1992 Linus Torvalds
	*
	* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
	* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
	* 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen
	*/

	#include <linux/sched.h>
	#include <linux/mm.h>
	#include <linux/smp.h>
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/wait.h>
	#include <linux/unistd.h>
	#include <linux/stddef.h>
	#include <linux/personality.h>
	#include <linux/compat.h>
	#include <linux/binfmts.h>
	#include <asm/ucontext.h>
	#include <asm/uaccess.h>
	#include <asm/fpu/internal.h>
	#include <asm/fpu/signal.h>
	#include <asm/ptrace.h>
	#include <asm/ia32_unistd.h>
	#include <asm/user32.h>
	#include <uapi/asm/sigcontext.h>
	#include <asm/proto.h>
	#include <asm/vdso.h>
	#include <asm/sigframe.h>
	#include <asm/sighandling.h>
	#include <asm/sys_ia32.h>
	#include <asm/smap.h>

	/*
	* Do a signal return; undo the signal stack.
	*/
	#define loadsegment_gs(v) load_gs_index(v)
	#define loadsegment_fs(v) loadsegment(fs, v)
	#define loadsegment_ds(v) loadsegment(ds, v)
	#define loadsegment_es(v) loadsegment(es, v)

	#define get_user_seg(seg) ({ unsigned int v; savesegment(seg, v); v; })
	#define set_user_seg(seg, v) loadsegment_##seg(v)

	#define COPY(x) { \
	get_user_ex(regs->x, &sc->x); \
	}

	#define GET_SEG(seg) ({ \
	unsigned short tmp; \
	get_user_ex(tmp, &sc->seg); \
	tmp; \
	})

	#define COPY_SEG_CPL3(seg) do { \
	regs->seg = GET_SEG(seg) \| 3; \
	} while (0)

	#define RELOAD_SEG(seg) { \
	unsigned int pre = GET_SEG(seg); \
	unsigned int cur = get_user_seg(seg); \
	pre \|= 3; \
	if (pre != cur) \
	set_user_seg(seg, pre); \
	}

	static int ia32_restore_sigcontext(struct pt_regs *regs,
	struct sigcontext_32 __user *sc)
	{
	unsigned int tmpflags, err = 0;
	void __user *buf;
	u32 tmp;

	/* Always make any pending restarted system calls return -EINTR */
	current->restart_block.fn = do_no_restart_syscall;

	get_user_try {
	/*
	* Reload fs and gs if they have changed in the signal
	* handler. This does not handle long fs/gs base changes in
	* the handler, but does not clobber them at least in the
	* normal case.
	*/
	RELOAD_SEG(gs);
	RELOAD_SEG(fs);
	RELOAD_SEG(ds);
	RELOAD_SEG(es);

	COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
	COPY(dx); COPY(cx); COPY(ip); COPY(ax);
	/* Don't touch extended registers */

	COPY_SEG_CPL3(cs);
	COPY_SEG_CPL3(ss);

	get_user_ex(tmpflags, &sc->flags);
	regs->flags = (regs->flags & ~FIX_EFLAGS) \| (tmpflags & FIX_EFLAGS);
	/* disable syscall checks */
	regs->orig_ax = -1;

	get_user_ex(tmp, &sc->fpstate);
	buf = compat_ptr(tmp);
	} get_user_catch(err);

	err \|= fpu__restore_sig(buf, 1);

	force_iret();

	return err;
	}

	asmlinkage long sys32_sigreturn(void)
	{
	struct pt_regs *regs = current_pt_regs();
	struct sigframe_ia32 __user frame = (struct sigframe_ia32 __user )(regs->sp-8);
	sigset_t set;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	goto badframe;
	if (__get_user(set.sig[0], &frame->sc.oldmask)
	\|\| (_COMPAT_NSIG_WORDS > 1
	&& __copy_from_user((((char *) &set.sig) + 4),
	&frame->extramask,
	sizeof(frame->extramask))))
	goto badframe;

	set_current_blocked(&set);

	if (ia32_restore_sigcontext(regs, &frame->sc))
	goto badframe;
	return regs->ax;

	badframe:
	signal_fault(regs, frame, "32bit sigreturn");
	return 0;
	}

	asmlinkage long sys32_rt_sigreturn(void)
	{
	struct pt_regs *regs = current_pt_regs();
	struct rt_sigframe_ia32 __user *frame;
	sigset_t set;

	frame = (struct rt_sigframe_ia32 __user *)(regs->sp - 4);

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	goto badframe;
	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	goto badframe;

	set_current_blocked(&set);

	if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext))
	goto badframe;

	if (compat_restore_altstack(&frame->uc.uc_stack))
	goto badframe;

	return regs->ax;

	badframe:
	signal_fault(regs, frame, "32bit rt sigreturn");
	return 0;
	}

	/*
	* Set up a signal frame.
	*/

	static int ia32_setup_sigcontext(struct sigcontext_32 __user *sc,
	void __user *fpstate,
	struct pt_regs *regs, unsigned int mask)
	{
	int err = 0;

	put_user_try {
	put_user_ex(get_user_seg(gs), (unsigned int __user *)&sc->gs);
	put_user_ex(get_user_seg(fs), (unsigned int __user *)&sc->fs);
	put_user_ex(get_user_seg(ds), (unsigned int __user *)&sc->ds);
	put_user_ex(get_user_seg(es), (unsigned int __user *)&sc->es);

	put_user_ex(regs->di, &sc->di);
	put_user_ex(regs->si, &sc->si);
	put_user_ex(regs->bp, &sc->bp);
	put_user_ex(regs->sp, &sc->sp);
	put_user_ex(regs->bx, &sc->bx);
	put_user_ex(regs->dx, &sc->dx);
	put_user_ex(regs->cx, &sc->cx);
	put_user_ex(regs->ax, &sc->ax);
	put_user_ex(current->thread.trap_nr, &sc->trapno);
	put_user_ex(current->thread.error_code, &sc->err);
	put_user_ex(regs->ip, &sc->ip);
	put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
	put_user_ex(regs->flags, &sc->flags);
	put_user_ex(regs->sp, &sc->sp_at_signal);
	put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);

	put_user_ex(ptr_to_compat(fpstate), &sc->fpstate);

	/* non-iBCS2 extensions.. */
	put_user_ex(mask, &sc->oldmask);
	put_user_ex(current->thread.cr2, &sc->cr2);
	} put_user_catch(err);

	return err;
	}

	/*
	* Determine which stack to use..
	*/
	static void __user get_sigframe(struct ksignal ksig, struct pt_regs *regs,
	size_t frame_size,
	void __user **fpstate)
	{
	struct fpu *fpu = &current->thread.fpu;
	unsigned long sp;

	/* Default to using normal stack */
	sp = regs->sp;

	/* This is the X/Open sanctioned signal stack switching. */
	if (ksig->ka.sa.sa_flags & SA_ONSTACK)
	sp = sigsp(sp, ksig);
	/* This is the legacy signal stack switching. */
	else if ((regs->ss & 0xffff) != __USER32_DS &&
	!(ksig->ka.sa.sa_flags & SA_RESTORER) &&
	ksig->ka.sa.sa_restorer)
	sp = (unsigned long) ksig->ka.sa.sa_restorer;

	if (fpu->fpstate_active) {
	unsigned long fx_aligned, math_size;

	sp = fpu__alloc_mathframe(sp, 1, &fx_aligned, &math_size);
	fpstate = (struct _fpstate_32 __user ) sp;
	if (copy_fpstate_to_sigframe(fpstate, (void __user )fx_aligned,
	math_size) < 0)
	return (void __user *) -1L;
	}

	sp -= frame_size;
	/* Align the stack pointer according to the i386 ABI,
	* i.e. so that on function entry ((sp + 4) & 15) == 0. */
	sp = ((sp + 4) & -16ul) - 4;
	return (void __user *) sp;
	}

	int ia32_setup_frame(int sig, struct ksignal *ksig,
	compat_sigset_t set, struct pt_regs regs)
	{
	struct sigframe_ia32 __user *frame;
	void __user *restorer;
	int err = 0;
	void __user *fpstate = NULL;

	/* copy_to_user optimizes that into a single 8 byte store */
	static const struct {
	u16 poplmovl;
	u32 val;
	u16 int80;
	} __attribute__((packed)) code = {
	0xb858, /* popl %eax ; movl $...,%eax */
	__NR_ia32_sigreturn,
	0x80cd, /* int $0x80 */
	};

	frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	return -EFAULT;

	if (__put_user(sig, &frame->sig))
	return -EFAULT;

	if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
	return -EFAULT;

	if (_COMPAT_NSIG_WORDS > 1) {
	if (__copy_to_user(frame->extramask, &set->sig[1],
	sizeof(frame->extramask)))
	return -EFAULT;
	}

	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
	restorer = ksig->ka.sa.sa_restorer;
	} else {
	/* Return stub is in 32bit vsyscall page */
	if (current->mm->context.vdso)
	restorer = current->mm->context.vdso +
	vdso_image_32.sym___kernel_sigreturn;
	else
	restorer = &frame->retcode;
	}

	put_user_try {
	put_user_ex(ptr_to_compat(restorer), &frame->pretcode);

	/*
	* These are actually not used anymore, but left because some
	* gdb versions depend on them as a marker.
	*/
	put_user_ex(((u64 )&code), (u64 __user *)frame->retcode);
	} put_user_catch(err);

	if (err)
	return -EFAULT;

	/* Set up registers for signal handler */
	regs->sp = (unsigned long) frame;
	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;

	/* Make -mregparm=3 work */
	regs->ax = sig;
	regs->dx = 0;
	regs->cx = 0;

	loadsegment(ds, __USER32_DS);
	loadsegment(es, __USER32_DS);

	regs->cs = __USER32_CS;
	regs->ss = __USER32_DS;

	return 0;
	}

	int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
	compat_sigset_t set, struct pt_regs regs)
	{
	struct rt_sigframe_ia32 __user *frame;
	void __user *restorer;
	int err = 0;
	void __user *fpstate = NULL;

	/* __copy_to_user optimizes that into a single 8 byte store */
	static const struct {
	u8 movl;
	u32 val;
	u16 int80;
	u8 pad;
	} __attribute__((packed)) code = {
	0xb8,
	__NR_ia32_rt_sigreturn,
	0x80cd,
	0,
	};

	frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	return -EFAULT;

	put_user_try {
	put_user_ex(sig, &frame->sig);
	put_user_ex(ptr_to_compat(&frame->info), &frame->pinfo);
	put_user_ex(ptr_to_compat(&frame->uc), &frame->puc);

	/* Create the ucontext. */
	if (boot_cpu_has(X86_FEATURE_XSAVE))
	put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
	else
	put_user_ex(0, &frame->uc.uc_flags);
	put_user_ex(0, &frame->uc.uc_link);
	compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);

	if (ksig->ka.sa.sa_flags & SA_RESTORER)
	restorer = ksig->ka.sa.sa_restorer;
	else
	restorer = current->mm->context.vdso +
	vdso_image_32.sym___kernel_rt_sigreturn;
	put_user_ex(ptr_to_compat(restorer), &frame->pretcode);

	/*
	* Not actually used anymore, but left because some gdb
	* versions need it.
	*/
	put_user_ex(((u64 )&code), (u64 __user *)frame->retcode);
	} put_user_catch(err);

	err \|= copy_siginfo_to_user32(&frame->info, &ksig->info);
	err \|= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
	regs, set->sig[0]);
	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));

	if (err)
	return -EFAULT;

	/* Set up registers for signal handler */
	regs->sp = (unsigned long) frame;
	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;

	/* Make -mregparm=3 work */
	regs->ax = sig;
	regs->dx = (unsigned long) &frame->info;
	regs->cx = (unsigned long) &frame->uc;

	loadsegment(ds, __USER32_DS);
	loadsegment(es, __USER32_DS);

	regs->cs = __USER32_CS;
	regs->ss = __USER32_DS;

	return 0;
	}