[deliverable/linux.git] / arch / sparc / kernel / signal_64.c

/*
 *  arch/sparc64/kernel/signal.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *  Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
 *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
 *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
 *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
 */

#ifdef CONFIG_COMPAT
#include <linux/compat.h>	/* for compat_old_sigset_t */
#endif
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/unistd.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/binfmts.h>
#include <linux/bitops.h>
#include <linux/context_tracking.h>

#include <asm/uaccess.h>
#include <asm/ptrace.h>
#include <asm/pgtable.h>
#include <asm/fpumacro.h>
#include <asm/uctx.h>
#include <asm/siginfo.h>
#include <asm/visasm.h>
#include <asm/switch_to.h>
#include <asm/cacheflush.h>

#include "sigutil.h"
#include "systbls.h"
#include "kernel.h"
#include "entry.h"

/* {set, get}context() needed for 64-bit SparcLinux userland. */
asmlinkage void sparc64_set_context(struct pt_regs *regs)
{
	struct ucontext __user *ucp = (struct ucontext __user *)
		regs->u_regs[UREG_I0];
	enum ctx_state prev_state = exception_enter();
	mc_gregset_t __user *grp;
	unsigned long pc, npc, tstate;
	unsigned long fp, i7;
	unsigned char fenab;
	int err;

	synchronize_user_stack();
	if (get_thread_wsaved()					||
	    (((unsigned long)ucp) & (sizeof(unsigned long)-1))	||
	    (!__access_ok(ucp, sizeof(*ucp))))
		goto do_sigsegv;
	grp  = &ucp->uc_mcontext.mc_gregs;
	err  = __get_user(pc, &((*grp)[MC_PC]));
	err |= __get_user(npc, &((*grp)[MC_NPC]));
	if (err || ((pc | npc) & 3))
		goto do_sigsegv;
	if (regs->u_regs[UREG_I1]) {
		sigset_t set;

		if (_NSIG_WORDS == 1) {
			if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
				goto do_sigsegv;
		} else {
			if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
				goto do_sigsegv;
		}
		set_current_blocked(&set);
	}
	if (test_thread_flag(TIF_32BIT)) {
		pc &= 0xffffffff;
		npc &= 0xffffffff;
	}
	regs->tpc = pc;
	regs->tnpc = npc;
	err |= __get_user(regs->y, &((*grp)[MC_Y]));
	err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
	regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
	regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
	err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
	err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
	err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
	err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
	err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
	err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));

	/* Skip %g7 as that's the thread register in userspace.  */

	err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
	err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
	err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
	err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
	err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
	err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
	err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
	err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));

	err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
	err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
	err |= __put_user(fp,
	      (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
	err |= __put_user(i7,
	      (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));

	err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
	if (fenab) {
		unsigned long *fpregs = current_thread_info()->fpregs;
		unsigned long fprs;
		
		fprs_write(0);
		err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
		if (fprs & FPRS_DL)
			err |= copy_from_user(fpregs,
					      &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
					      (sizeof(unsigned int) * 32));
		if (fprs & FPRS_DU)
			err |= copy_from_user(fpregs+16,
			 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
			 (sizeof(unsigned int) * 32));
		err |= __get_user(current_thread_info()->xfsr[0],
				  &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
		err |= __get_user(current_thread_info()->gsr[0],
				  &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
		regs->tstate &= ~TSTATE_PEF;
	}
	if (err)
		goto do_sigsegv;
out:
	exception_exit(prev_state);
	return;
do_sigsegv:
	force_sig(SIGSEGV, current);
	goto out;
}

asmlinkage void sparc64_get_context(struct pt_regs *regs)
{
	struct ucontext __user *ucp = (struct ucontext __user *)
		regs->u_regs[UREG_I0];
	enum ctx_state prev_state = exception_enter();
	mc_gregset_t __user *grp;
	mcontext_t __user *mcp;
	unsigned long fp, i7;
	unsigned char fenab;
	int err;

	synchronize_user_stack();
	if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
		goto do_sigsegv;

#if 1
	fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
#else
	fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
#endif
		
	mcp = &ucp->uc_mcontext;
	grp = &mcp->mc_gregs;

	/* Skip over the trap instruction, first. */
	if (test_thread_flag(TIF_32BIT)) {
		regs->tpc   = (regs->tnpc & 0xffffffff);
		regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
	} else {
		regs->tpc   = regs->tnpc;
		regs->tnpc += 4;
	}
	err = 0;
	if (_NSIG_WORDS == 1)
		err |= __put_user(current->blocked.sig[0],
				  (unsigned long __user *)&ucp->uc_sigmask);
	else
		err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
				      sizeof(sigset_t));

	err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
	err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
	err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
	err |= __put_user(regs->y, &((*grp)[MC_Y]));
	err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
	err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
	err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
	err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
	err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
	err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
	err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
	err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
	err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
	err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
	err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
	err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
	err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
	err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
	err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));

	err |= __get_user(fp,
		 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
	err |= __get_user(i7,
		 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
	err |= __put_user(fp, &(mcp->mc_fp));
	err |= __put_user(i7, &(mcp->mc_i7));

	err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
	if (fenab) {
		unsigned long *fpregs = current_thread_info()->fpregs;
		unsigned long fprs;
		
		fprs = current_thread_info()->fpsaved[0];
		if (fprs & FPRS_DL)
			err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
					    (sizeof(unsigned int) * 32));
		if (fprs & FPRS_DU)
			err |= copy_to_user(
                          ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
			  (sizeof(unsigned int) * 32));
		err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
		err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
		err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
	}
	if (err)
		goto do_sigsegv;
out:
	exception_exit(prev_state);
	return;
do_sigsegv:
	force_sig(SIGSEGV, current);
	goto out;
}

/* Checks if the fp is valid.  We always build rt signal frames which
 * are 16-byte aligned, therefore we can always enforce that the
 * restore frame has that property as well.
 */
static bool invalid_frame_pointer(void __user *fp)
{
	if (((unsigned long) fp) & 15)
		return true;
	return false;
}

struct rt_signal_frame {
	struct sparc_stackf	ss;
	siginfo_t		info;
	struct pt_regs		regs;
	__siginfo_fpu_t __user	*fpu_save;
	stack_t			stack;
	sigset_t		mask;
	__siginfo_rwin_t	*rwin_save;
};

void do_rt_sigreturn(struct pt_regs *regs)
{
	unsigned long tpc, tnpc, tstate, ufp;
	struct rt_signal_frame __user *sf;
	__siginfo_fpu_t __user *fpu_save;
	__siginfo_rwin_t __user *rwin_save;
	sigset_t set;
	int err;

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

	synchronize_user_stack ();
	sf = (struct rt_signal_frame __user *)
		(regs->u_regs [UREG_FP] + STACK_BIAS);

	/* 1. Make sure we are not getting garbage from the user */
	if (invalid_frame_pointer(sf))
		goto segv;

	if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
		goto segv;

	if ((ufp + STACK_BIAS) & 0x7)
		goto segv;

	err = __get_user(tpc, &sf->regs.tpc);
	err |= __get_user(tnpc, &sf->regs.tnpc);
	if (test_thread_flag(TIF_32BIT)) {
		tpc &= 0xffffffff;
		tnpc &= 0xffffffff;
	}
	err |= ((tpc | tnpc) & 3);

	/* 2. Restore the state */
	err |= __get_user(regs->y, &sf->regs.y);
	err |= __get_user(tstate, &sf->regs.tstate);
	err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));

	/* User can only change condition codes and %asi in %tstate. */
	regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
	regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));

	err |= __get_user(fpu_save, &sf->fpu_save);
	if (!err && fpu_save)
		err |= restore_fpu_state(regs, fpu_save);

	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
	err |= restore_altstack(&sf->stack);
	if (err)
		goto segv;

	err |= __get_user(rwin_save, &sf->rwin_save);
	if (!err && rwin_save) {
		if (restore_rwin_state(rwin_save))
			goto segv;
	}

	regs->tpc = tpc;
	regs->tnpc = tnpc;

	/* Prevent syscall restart.  */
	pt_regs_clear_syscall(regs);

	set_current_blocked(&set);
	return;
segv:
	force_sig(SIGSEGV, current);
}

static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
{
	unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;

	/*
	 * If we are on the alternate signal stack and would overflow it, don't.
	 * Return an always-bogus address instead so we will die with SIGSEGV.
	 */
	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
		return (void __user *) -1L;

	/* This is the X/Open sanctioned signal stack switching.  */
	sp = sigsp(sp, ksig) - framesize;

	/* Always align the stack frame.  This handles two cases.  First,
	 * sigaltstack need not be mindful of platform specific stack
	 * alignment.  Second, if we took this signal because the stack
	 * is not aligned properly, we'd like to take the signal cleanly
	 * and report that.
	 */
	sp &= ~15UL;

	return (void __user *) sp;
}

static inline int
setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
{
	struct rt_signal_frame __user *sf;
	int wsaved, err, sf_size;
	void __user *tail;

	/* 1. Make sure everything is clean */
	synchronize_user_stack();
	save_and_clear_fpu();
	
	wsaved = get_thread_wsaved();

	sf_size = sizeof(struct rt_signal_frame);
	if (current_thread_info()->fpsaved[0] & FPRS_FEF)
		sf_size += sizeof(__siginfo_fpu_t);
	if (wsaved)
		sf_size += sizeof(__siginfo_rwin_t);
	sf = (struct rt_signal_frame __user *)
		get_sigframe(ksig, regs, sf_size);

	if (invalid_frame_pointer (sf)) {
		do_exit(SIGILL);	/* won't return, actually */
		return -EINVAL;
	}

	tail = (sf + 1);

	/* 2. Save the current process state */
	err = copy_to_user(&sf->regs, regs, sizeof (*regs));

	if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
		__siginfo_fpu_t __user *fpu_save = tail;
		tail += sizeof(__siginfo_fpu_t);
		err |= save_fpu_state(regs, fpu_save);
		err |= __put_user((u64)fpu_save, &sf->fpu_save);
	} else {
		err |= __put_user(0, &sf->fpu_save);
	}
	if (wsaved) {
		__siginfo_rwin_t __user *rwin_save = tail;
		tail += sizeof(__siginfo_rwin_t);
		err |= save_rwin_state(wsaved, rwin_save);
		err |= __put_user((u64)rwin_save, &sf->rwin_save);
		set_thread_wsaved(0);
	} else {
		err |= __put_user(0, &sf->rwin_save);
	}
	
	/* Setup sigaltstack */
	err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]);

	err |= copy_to_user(&sf->mask, sigmask_to_save(), sizeof(sigset_t));

	if (!wsaved) {
		err |= copy_in_user((u64 __user *)sf,
				    (u64 __user *)(regs->u_regs[UREG_FP] +
						   STACK_BIAS),
				    sizeof(struct reg_window));
	} else {
		struct reg_window *rp;

		rp = &current_thread_info()->reg_window[wsaved - 1];
		err |= copy_to_user(sf, rp, sizeof(struct reg_window));
	}
	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
		err |= copy_siginfo_to_user(&sf->info, &ksig->info);
	else {
		err |= __put_user(ksig->sig, &sf->info.si_signo);
		err |= __put_user(SI_NOINFO, &sf->info.si_code);
	}
	if (err)
		return err;
	
	/* 3. signal handler back-trampoline and parameters */
	regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
	regs->u_regs[UREG_I0] = ksig->sig;
	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;

	/* The sigcontext is passed in this way because of how it
	 * is defined in GLIBC's /usr/include/bits/sigcontext.h
	 * for sparc64.  It includes the 128 bytes of siginfo_t.
	 */
	regs->u_regs[UREG_I2] = (unsigned long) &sf->info;

	/* 5. signal handler */
	regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
	regs->tnpc = (regs->tpc + 4);
	if (test_thread_flag(TIF_32BIT)) {
		regs->tpc &= 0xffffffff;
		regs->tnpc &= 0xffffffff;
	}
	/* 4. return to kernel instructions */
	regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
	return 0;
}

static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
				   struct sigaction *sa)
{
	switch (regs->u_regs[UREG_I0]) {
	case ERESTART_RESTARTBLOCK:
	case ERESTARTNOHAND:
	no_system_call_restart:
		regs->u_regs[UREG_I0] = EINTR;
		regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
		break;
	case ERESTARTSYS:
		if (!(sa->sa_flags & SA_RESTART))
			goto no_system_call_restart;
		/* fallthrough */
	case ERESTARTNOINTR:
		regs->u_regs[UREG_I0] = orig_i0;
		regs->tpc -= 4;
		regs->tnpc -= 4;
	}
}

/* Note that 'init' is a special process: it doesn't get signals it doesn't
 * want to handle. Thus you cannot kill init even with a SIGKILL even by
 * mistake.
 */
static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
{
	struct ksignal ksig;
	int restart_syscall;
	bool has_handler;
	
	/* It's a lot of work and synchronization to add a new ptrace
	 * register for GDB to save and restore in order to get
	 * orig_i0 correct for syscall restarts when debugging.
	 *
	 * Although it should be the case that most of the global
	 * registers are volatile across a system call, glibc already
	 * depends upon that fact that we preserve them.  So we can't
	 * just use any global register to save away the orig_i0 value.
	 *
	 * In particular %g2, %g3, %g4, and %g5 are all assumed to be
	 * preserved across a system call trap by various pieces of
	 * code in glibc.
	 *
	 * %g7 is used as the "thread register".   %g6 is not used in
	 * any fixed manner.  %g6 is used as a scratch register and
	 * a compiler temporary, but it's value is never used across
	 * a system call.  Therefore %g6 is usable for orig_i0 storage.
	 */
	if (pt_regs_is_syscall(regs) &&
	    (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
		regs->u_regs[UREG_G6] = orig_i0;

#ifdef CONFIG_COMPAT
	if (test_thread_flag(TIF_32BIT)) {
		do_signal32(regs);
		return;
	}
#endif	

	has_handler = get_signal(&ksig);

	restart_syscall = 0;
	if (pt_regs_is_syscall(regs) &&
	    (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
		restart_syscall = 1;
		orig_i0 = regs->u_regs[UREG_G6];
	}

	if (has_handler) {
		if (restart_syscall)
			syscall_restart(orig_i0, regs, &ksig.ka.sa);
		signal_setup_done(setup_rt_frame(&ksig, regs), &ksig, 0);
	} else {
		if (restart_syscall) {
			switch (regs->u_regs[UREG_I0]) {
			case ERESTARTNOHAND:
	     		case ERESTARTSYS:
			case ERESTARTNOINTR:
				/* replay the system call when we are done */
				regs->u_regs[UREG_I0] = orig_i0;
				regs->tpc -= 4;
				regs->tnpc -= 4;
				pt_regs_clear_syscall(regs);
			case ERESTART_RESTARTBLOCK:
				regs->u_regs[UREG_G1] = __NR_restart_syscall;
				regs->tpc -= 4;
				regs->tnpc -= 4;
				pt_regs_clear_syscall(regs);
			}
		}
		restore_saved_sigmask();
	}
}

void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
{
	user_exit();
	if (thread_info_flags & _TIF_SIGPENDING)
		do_signal(regs, orig_i0);
	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
		clear_thread_flag(TIF_NOTIFY_RESUME);
		tracehook_notify_resume(regs);
	}
	user_enter();
}
Commit	Line	Data
b00dc837	1	/*
1da177e4 LT	2	* arch/sparc64/kernel/signal.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
0a4949c4	5	* Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
1da177e4 LT	6	* Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
	7	* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
	8	* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	9	*/
	10
09337f50	11	#ifdef CONFIG_COMPAT
1da177e4 LT	12	#include <linux/compat.h> /* for compat_old_sigset_t */
	13	#endif
	14	#include <linux/sched.h>
	15	#include <linux/kernel.h>
	16	#include <linux/signal.h>
	17	#include <linux/errno.h>
	18	#include <linux/wait.h>
	19	#include <linux/ptrace.h>
e35a8925	20	#include <linux/tracehook.h>
1da177e4 LT	21	#include <linux/unistd.h>
	22	#include <linux/mm.h>
	23	#include <linux/tty.h>
1da177e4 LT	24	#include <linux/binfmts.h>
1da177e4 LT	25	#include <linux/bitops.h>
812cb83a	26	#include <linux/context_tracking.h>
1da177e4 LT	27
	28	#include <asm/uaccess.h>
	29	#include <asm/ptrace.h>
1da177e4 LT	30	#include <asm/pgtable.h>
	31	#include <asm/fpumacro.h>
	32	#include <asm/uctx.h>
	33	#include <asm/siginfo.h>
	34	#include <asm/visasm.h>
d550bbd4 DH	35	#include <asm/switch_to.h>
d550bbd4 DH	36	#include <asm/cacheflush.h>
1da177e4	37
5598473a	38	#include "sigutil.h"
abaff455 SR	39	#include "systbls.h"
	40	#include "kernel.h"
	41	#include "entry.h"
062ea6d3	42
1da177e4 LT	43	/* {set, get}context() needed for 64-bit SparcLinux userland. */
	44	asmlinkage void sparc64_set_context(struct pt_regs *regs)
	45	{
	46	struct ucontext __user ucp = (struct ucontext __user )
	47	regs->u_regs[UREG_I0];
812cb83a	48	enum ctx_state prev_state = exception_enter();
1da177e4 LT	49	mc_gregset_t __user *grp;
	50	unsigned long pc, npc, tstate;
	51	unsigned long fp, i7;
	52	unsigned char fenab;
	53	int err;
	54
397d1533	55	synchronize_user_stack();
1da177e4 LT	56	if (get_thread_wsaved() \|\|
	57	(((unsigned long)ucp) & (sizeof(unsigned long)-1)) \|\|
	58	(!__access_ok(ucp, sizeof(*ucp))))
	59	goto do_sigsegv;
	60	grp = &ucp->uc_mcontext.mc_gregs;
	61	err = __get_user(pc, &((*grp)[MC_PC]));
	62	err \|= __get_user(npc, &((*grp)[MC_NPC]));
	63	if (err \|\| ((pc \| npc) & 3))
	64	goto do_sigsegv;
	65	if (regs->u_regs[UREG_I1]) {
	66	sigset_t set;
	67
	68	if (_NSIG_WORDS == 1) {
	69	if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
	70	goto do_sigsegv;
	71	} else {
	72	if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
	73	goto do_sigsegv;
	74	}
faddf598	75	set_current_blocked(&set);
1da177e4 LT	76	}
	77	if (test_thread_flag(TIF_32BIT)) {
	78	pc &= 0xffffffff;
	79	npc &= 0xffffffff;
	80	}
	81	regs->tpc = pc;
	82	regs->tnpc = npc;
	83	err \|= __get_user(regs->y, &((*grp)[MC_Y]));
	84	err \|= __get_user(tstate, &((*grp)[MC_TSTATE]));
	85	regs->tstate &= ~(TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC);
	86	regs->tstate \|= (tstate & (TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC));
	87	err \|= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
	88	err \|= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
	89	err \|= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
	90	err \|= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
	91	err \|= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
	92	err \|= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
0a4949c4 DM	93
	94	/* Skip %g7 as that's the thread register in userspace. */
	95
1da177e4 LT	96	err \|= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
	97	err \|= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
	98	err \|= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
	99	err \|= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
	100	err \|= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
	101	err \|= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
	102	err \|= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
	103	err \|= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
	104
	105	err \|= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
	106	err \|= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
	107	err \|= __put_user(fp,
	108	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
	109	err \|= __put_user(i7,
	110	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
	111
	112	err \|= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
	113	if (fenab) {
	114	unsigned long *fpregs = current_thread_info()->fpregs;
	115	unsigned long fprs;
	116
	117	fprs_write(0);
	118	err \|= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
	119	if (fprs & FPRS_DL)
	120	err \|= copy_from_user(fpregs,
	121	&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
	122	(sizeof(unsigned int) * 32));
	123	if (fprs & FPRS_DU)
	124	err \|= copy_from_user(fpregs+16,
	125	((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
	126	(sizeof(unsigned int) * 32));
	127	err \|= __get_user(current_thread_info()->xfsr[0],
	128	&(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
	129	err \|= __get_user(current_thread_info()->gsr[0],
	130	&(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
	131	regs->tstate &= ~TSTATE_PEF;
	132	}
	133	if (err)
	134	goto do_sigsegv;
812cb83a KT	135	out:
812cb83a KT	136	exception_exit(prev_state);
1da177e4 LT	137	return;
	138	do_sigsegv:
	139	force_sig(SIGSEGV, current);
812cb83a	140	goto out;
1da177e4 LT	141	}
	142
	143	asmlinkage void sparc64_get_context(struct pt_regs *regs)
	144	{
	145	struct ucontext __user ucp = (struct ucontext __user )
	146	regs->u_regs[UREG_I0];
812cb83a	147	enum ctx_state prev_state = exception_enter();
1da177e4 LT	148	mc_gregset_t __user *grp;
	149	mcontext_t __user *mcp;
	150	unsigned long fp, i7;
	151	unsigned char fenab;
	152	int err;
	153
	154	synchronize_user_stack();
	155	if (get_thread_wsaved() \|\| clear_user(ucp, sizeof(*ucp)))
	156	goto do_sigsegv;
	157
	158	#if 1
	159	fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
	160	#else
	161	fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
	162	#endif
	163
	164	mcp = &ucp->uc_mcontext;
	165	grp = &mcp->mc_gregs;
	166
	167	/* Skip over the trap instruction, first. */
	168	if (test_thread_flag(TIF_32BIT)) {
	169	regs->tpc = (regs->tnpc & 0xffffffff);
	170	regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
	171	} else {
	172	regs->tpc = regs->tnpc;
	173	regs->tnpc += 4;
	174	}
	175	err = 0;
	176	if (_NSIG_WORDS == 1)
	177	err \|= __put_user(current->blocked.sig[0],
	178	(unsigned long __user *)&ucp->uc_sigmask);
	179	else
	180	err \|= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
	181	sizeof(sigset_t));
	182
	183	err \|= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
	184	err \|= __put_user(regs->tpc, &((*grp)[MC_PC]));
	185	err \|= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
	186	err \|= __put_user(regs->y, &((*grp)[MC_Y]));
	187	err \|= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
	188	err \|= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
	189	err \|= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
	190	err \|= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
	191	err \|= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
	192	err \|= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
	193	err \|= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
	194	err \|= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
	195	err \|= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
	196	err \|= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
	197	err \|= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
	198	err \|= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
	199	err \|= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
	200	err \|= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
	201	err \|= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
	202
	203	err \|= __get_user(fp,
	204	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
	205	err \|= __get_user(i7,
	206	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
	207	err \|= __put_user(fp, &(mcp->mc_fp));
	208	err \|= __put_user(i7, &(mcp->mc_i7));
	209
	210	err \|= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
	211	if (fenab) {
212	unsigned long *fpregs = current_thread_info()->fpregs;
213	unsigned long fprs;
214
215	fprs = current_thread_info()->fpsaved[0];
216	if (fprs & FPRS_DL)
217	err \|= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
218	(sizeof(unsigned int) * 32));
219	if (fprs & FPRS_DU)
220	err \|= copy_to_user(
221	((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
222	(sizeof(unsigned int) * 32));
223	err \|= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
224	err \|= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
225	err \|= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
226	}
227	if (err)
228	goto do_sigsegv;
812cb83a KT	229	out:
812cb83a KT	230	exception_exit(prev_state);
1da177e4 LT	231	return;
	232	do_sigsegv:
	233	force_sig(SIGSEGV, current);
812cb83a	234	goto out;
1da177e4 LT	235	}
1da177e4 LT	236
d11c2a0d DM	237	/* Checks if the fp is valid. We always build rt signal frames which
	238	* are 16-byte aligned, therefore we can always enforce that the
	239	* restore frame has that property as well.
	240	*/
	241	static bool invalid_frame_pointer(void __user *fp)
	242	{
	243	if (((unsigned long) fp) & 15)
	244	return true;
	245	return false;
	246	}
	247
1da177e4 LT	248	struct rt_signal_frame {
	249	struct sparc_stackf ss;
	250	siginfo_t info;
	251	struct pt_regs regs;
	252	__siginfo_fpu_t __user *fpu_save;
	253	stack_t stack;
	254	sigset_t mask;
5598473a	255	__siginfo_rwin_t *rwin_save;
1da177e4 LT	256	};
1da177e4 LT	257
1da177e4 LT	258	void do_rt_sigreturn(struct pt_regs *regs)
1da177e4 LT	259	{
d11c2a0d	260	unsigned long tpc, tnpc, tstate, ufp;
1da177e4	261	struct rt_signal_frame __user *sf;
1da177e4	262	__siginfo_fpu_t __user *fpu_save;
5598473a	263	__siginfo_rwin_t __user *rwin_save;
1da177e4	264	sigset_t set;
1da177e4 LT	265	int err;
	266
	267	/* Always make any pending restarted system calls return -EINTR */
f56141e3	268	current->restart_block.fn = do_no_restart_syscall;
1da177e4 LT	269
	270	synchronize_user_stack ();
	271	sf = (struct rt_signal_frame __user *)
	272	(regs->u_regs [UREG_FP] + STACK_BIAS);
	273
	274	/* 1. Make sure we are not getting garbage from the user */
d11c2a0d DM	275	if (invalid_frame_pointer(sf))
	276	goto segv;
	277
	278	if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
1da177e4 LT	279	goto segv;
1da177e4 LT	280
d11c2a0d DM	281	if ((ufp + STACK_BIAS) & 0x7)
	282	goto segv;
	283
	284	err = __get_user(tpc, &sf->regs.tpc);
1da177e4 LT	285	err \|= __get_user(tnpc, &sf->regs.tnpc);
	286	if (test_thread_flag(TIF_32BIT)) {
	287	tpc &= 0xffffffff;
	288	tnpc &= 0xffffffff;
	289	}
	290	err \|= ((tpc \| tnpc) & 3);
	291
	292	/* 2. Restore the state */
	293	err \|= __get_user(regs->y, &sf->regs.y);
	294	err \|= __get_user(tstate, &sf->regs.tstate);
	295	err \|= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
	296
	297	/* User can only change condition codes and %asi in %tstate. */
	298	regs->tstate &= ~(TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC);
	299	regs->tstate \|= (tstate & (TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC));
	300
	301	err \|= __get_user(fpu_save, &sf->fpu_save);
5598473a DM	302	if (!err && fpu_save)
5598473a DM	303	err \|= restore_fpu_state(regs, fpu_save);
1da177e4 LT	304
1da177e4 LT	305	err \|= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
99b06feb AV	306	err \|= restore_altstack(&sf->stack);
99b06feb AV	307	if (err)
1da177e4	308	goto segv;
62715ec8	309
5598473a DM	310	err \|= __get_user(rwin_save, &sf->rwin_save);
	311	if (!err && rwin_save) {
	312	if (restore_rwin_state(rwin_save))
	313	goto segv;
	314	}
	315
1da177e4 LT	316	regs->tpc = tpc;
1da177e4 LT	317	regs->tnpc = tnpc;
1da177e4	318
2678fefe	319	/* Prevent syscall restart. */
28e61036	320	pt_regs_clear_syscall(regs);
2678fefe	321
faddf598	322	set_current_blocked(&set);
1da177e4 LT	323	return;
	324	segv:
	325	force_sig(SIGSEGV, current);
	326	}
	327
08f73957	328	static inline void __user get_sigframe(struct ksignal ksig, struct pt_regs *regs, unsigned long framesize)
1da177e4	329	{
dc5dc7e6	330	unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
1da177e4	331
dc5dc7e6 DM	332	/*
	333	* If we are on the alternate signal stack and would overflow it, don't.
	334	* Return an always-bogus address instead so we will die with SIGSEGV.
	335	*/
	336	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
	337	return (void __user *) -1L;
1da177e4 LT	338
1da177e4 LT	339	/* This is the X/Open sanctioned signal stack switching. */
08f73957	340	sp = sigsp(sp, ksig) - framesize;
f036d9f3	341
dc5dc7e6 DM	342	/* Always align the stack frame. This handles two cases. First,
	343	* sigaltstack need not be mindful of platform specific stack
	344	* alignment. Second, if we took this signal because the stack
	345	* is not aligned properly, we'd like to take the signal cleanly
	346	* and report that.
	347	*/
f036d9f3	348	sp &= ~15UL;
dc5dc7e6	349
f036d9f3	350	return (void __user *) sp;
1da177e4 LT	351	}
1da177e4 LT	352
392c2180	353	static inline int
08f73957	354	setup_rt_frame(struct ksignal ksig, struct pt_regs regs)
1da177e4 LT	355	{
1da177e4 LT	356	struct rt_signal_frame __user *sf;
5598473a DM	357	int wsaved, err, sf_size;
5598473a DM	358	void __user *tail;
1da177e4 LT	359
	360	/* 1. Make sure everything is clean */
	361	synchronize_user_stack();
	362	save_and_clear_fpu();
	363
5598473a	364	wsaved = get_thread_wsaved();
1da177e4	365
5598473a DM	366	sf_size = sizeof(struct rt_signal_frame);
	367	if (current_thread_info()->fpsaved[0] & FPRS_FEF)
	368	sf_size += sizeof(__siginfo_fpu_t);
	369	if (wsaved)
	370	sf_size += sizeof(__siginfo_rwin_t);
1da177e4	371	sf = (struct rt_signal_frame __user *)
08f73957	372	get_sigframe(ksig, regs, sf_size);
1da177e4	373
08f73957 AV	374	if (invalid_frame_pointer (sf)) {
	375	do_exit(SIGILL); /* won't return, actually */
	376	return -EINVAL;
	377	}
1da177e4	378
5598473a DM	379	tail = (sf + 1);
5598473a DM	380
1da177e4 LT	381	/* 2. Save the current process state */
	382	err = copy_to_user(&sf->regs, regs, sizeof (*regs));
	383
	384	if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
5598473a DM	385	__siginfo_fpu_t __user *fpu_save = tail;
	386	tail += sizeof(__siginfo_fpu_t);
	387	err \|= save_fpu_state(regs, fpu_save);
	388	err \|= __put_user((u64)fpu_save, &sf->fpu_save);
1da177e4 LT	389	} else {
	390	err \|= __put_user(0, &sf->fpu_save);
	391	}
5598473a DM	392	if (wsaved) {
	393	__siginfo_rwin_t __user *rwin_save = tail;
	394	tail += sizeof(__siginfo_rwin_t);
	395	err \|= save_rwin_state(wsaved, rwin_save);
	396	err \|= __put_user((u64)rwin_save, &sf->rwin_save);
	397	set_thread_wsaved(0);
	398	} else {
	399	err \|= __put_user(0, &sf->rwin_save);
	400	}
1da177e4 LT	401
1da177e4 LT	402	/* Setup sigaltstack */
99b06feb	403	err \|= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
1da177e4	404
08f73957	405	err \|= copy_to_user(&sf->mask, sigmask_to_save(), sizeof(sigset_t));
1da177e4	406
5598473a DM	407	if (!wsaved) {
	408	err \|= copy_in_user((u64 __user *)sf,
	409	(u64 __user *)(regs->u_regs[UREG_FP] +
	410	STACK_BIAS),
	411	sizeof(struct reg_window));
	412	} else {
	413	struct reg_window *rp;
1da177e4	414
5598473a DM	415	rp = &current_thread_info()->reg_window[wsaved - 1];
	416	err \|= copy_to_user(sf, rp, sizeof(struct reg_window));
	417	}
08f73957 AV	418	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
08f73957 AV	419	err \|= copy_siginfo_to_user(&sf->info, &ksig->info);
1da177e4	420	else {
08f73957	421	err \|= __put_user(ksig->sig, &sf->info.si_signo);
1da177e4 LT	422	err \|= __put_user(SI_NOINFO, &sf->info.si_code);
	423	}
	424	if (err)
08f73957	425	return err;
1da177e4 LT	426
	427	/* 3. signal handler back-trampoline and parameters */
	428	regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
08f73957	429	regs->u_regs[UREG_I0] = ksig->sig;
1da177e4 LT	430	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
	431
	432	/* The sigcontext is passed in this way because of how it
	433	* is defined in GLIBC's /usr/include/bits/sigcontext.h
	434	* for sparc64. It includes the 128 bytes of siginfo_t.
	435	*/
	436	regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
	437
	438	/* 5. signal handler */
08f73957	439	regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
1da177e4 LT	440	regs->tnpc = (regs->tpc + 4);
	441	if (test_thread_flag(TIF_32BIT)) {
	442	regs->tpc &= 0xffffffff;
	443	regs->tnpc &= 0xffffffff;
	444	}
	445	/* 4. return to kernel instructions */
08f73957	446	regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
392c2180	447	return 0;
1da177e4 LT	448	}
	449
	450	static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
28e61036	451	struct sigaction *sa)
1da177e4 LT	452	{
	453	switch (regs->u_regs[UREG_I0]) {
	454	case ERESTART_RESTARTBLOCK:
	455	case ERESTARTNOHAND:
	456	no_system_call_restart:
	457	regs->u_regs[UREG_I0] = EINTR;
	458	regs->tstate \|= (TSTATE_ICARRY\|TSTATE_XCARRY);
	459	break;
	460	case ERESTARTSYS:
	461	if (!(sa->sa_flags & SA_RESTART))
	462	goto no_system_call_restart;
	463	/* fallthrough */
	464	case ERESTARTNOINTR:
	465	regs->u_regs[UREG_I0] = orig_i0;
	466	regs->tpc -= 4;
	467	regs->tnpc -= 4;
	468	}
	469	}
	470
	471	/* Note that 'init' is a special process: it doesn't get signals it doesn't
	472	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	473	* mistake.
	474	*/
238468b2	475	static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
1da177e4	476	{
08f73957	477	struct ksignal ksig;
28e61036	478	int restart_syscall;
08f73957	479	bool has_handler;
1da177e4	480
1d299bc7 DM	481	/* It's a lot of work and synchronization to add a new ptrace
	482	* register for GDB to save and restore in order to get
	483	* orig_i0 correct for syscall restarts when debugging.
	484	*
e88d2468 DM	485	* Although it should be the case that most of the global
	486	* registers are volatile across a system call, glibc already
	487	* depends upon that fact that we preserve them. So we can't
	488	* just use any global register to save away the orig_i0 value.
	489	*
	490	* In particular %g2, %g3, %g4, and %g5 are all assumed to be
	491	* preserved across a system call trap by various pieces of
	492	* code in glibc.
	493	*
	494	* %g7 is used as the "thread register". %g6 is not used in
	495	* any fixed manner. %g6 is used as a scratch register and
	496	* a compiler temporary, but it's value is never used across
	497	* a system call. Therefore %g6 is usable for orig_i0 storage.
1d299bc7	498	*/
2678fefe	499	if (pt_regs_is_syscall(regs) &&
1d299bc7	500	(regs->tstate & (TSTATE_XCARRY \| TSTATE_ICARRY)))
e88d2468	501	regs->u_regs[UREG_G6] = orig_i0;
1da177e4	502
09337f50	503	#ifdef CONFIG_COMPAT
1da177e4	504	if (test_thread_flag(TIF_32BIT)) {
08f73957	505	do_signal32(regs);
2d7d5f05	506	return;
1da177e4 LT	507	}
	508	#endif
	509
08f73957	510	has_handler = get_signal(&ksig);
28e61036	511
1d299bc7 DM	512	restart_syscall = 0;
	513	if (pt_regs_is_syscall(regs) &&
	514	(regs->tstate & (TSTATE_XCARRY \| TSTATE_ICARRY))) {
	515	restart_syscall = 1;
e88d2468	516	orig_i0 = regs->u_regs[UREG_G6];
1d299bc7	517	}
28e61036	518
08f73957	519	if (has_handler) {
28e61036	520	if (restart_syscall)
08f73957 AV	521	syscall_restart(orig_i0, regs, &ksig.ka.sa);
	522	signal_setup_done(setup_rt_frame(&ksig, regs), &ksig, 0);
	523	} else {
	524	if (restart_syscall) {
	525	switch (regs->u_regs[UREG_I0]) {
	526	case ERESTARTNOHAND:
	527	case ERESTARTSYS:
	528	case ERESTARTNOINTR:
	529	/* replay the system call when we are done */
	530	regs->u_regs[UREG_I0] = orig_i0;
	531	regs->tpc -= 4;
	532	regs->tnpc -= 4;
	533	pt_regs_clear_syscall(regs);
	534	case ERESTART_RESTARTBLOCK:
	535	regs->u_regs[UREG_G1] = __NR_restart_syscall;
	536	regs->tpc -= 4;
	537	regs->tnpc -= 4;
	538	pt_regs_clear_syscall(regs);
	539	}
	540	}
	541	restore_saved_sigmask();
1da177e4	542	}
1da177e4 LT	543	}
1da177e4 LT	544
7697daaa	545	void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
1da177e4	546	{
812cb83a	547	user_exit();
9a28dbf8	548	if (thread_info_flags & _TIF_SIGPENDING)
238468b2	549	do_signal(regs, orig_i0);
e35a8925 RM	550	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	551	clear_thread_flag(TIF_NOTIFY_RESUME);
	552	tracehook_notify_resume(regs);
	553	}
812cb83a	554	user_enter();
1da177e4	555	}
ee18d64c	556