[linux-2.6-block.git] / arch / sparc / kernel / signal_64.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  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 <linux/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_UPROBE)
		uprobe_notify_resume(regs);
	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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
b00dc837	2	/*
1da177e4 LT	3	* arch/sparc64/kernel/signal.c
	4	*
	5	* Copyright (C) 1991, 1992 Linus Torvalds
0a4949c4	6	* Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
1da177e4 LT	7	* Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
	8	* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
	9	* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	10	*/
	11
09337f50	12	#ifdef CONFIG_COMPAT
1da177e4 LT	13	#include <linux/compat.h> /* for compat_old_sigset_t */
	14	#endif
	15	#include <linux/sched.h>
	16	#include <linux/kernel.h>
	17	#include <linux/signal.h>
	18	#include <linux/errno.h>
	19	#include <linux/wait.h>
	20	#include <linux/ptrace.h>
e35a8925	21	#include <linux/tracehook.h>
1da177e4 LT	22	#include <linux/unistd.h>
	23	#include <linux/mm.h>
	24	#include <linux/tty.h>
1da177e4 LT	25	#include <linux/binfmts.h>
1da177e4 LT	26	#include <linux/bitops.h>
812cb83a	27	#include <linux/context_tracking.h>
1da177e4	28
7c0f6ba6	29	#include <linux/uaccess.h>
1da177e4	30	#include <asm/ptrace.h>
1da177e4 LT	31	#include <asm/pgtable.h>
	32	#include <asm/fpumacro.h>
	33	#include <asm/uctx.h>
	34	#include <asm/siginfo.h>
	35	#include <asm/visasm.h>
d550bbd4 DH	36	#include <asm/switch_to.h>
d550bbd4 DH	37	#include <asm/cacheflush.h>
1da177e4	38
5598473a	39	#include "sigutil.h"
abaff455 SR	40	#include "systbls.h"
	41	#include "kernel.h"
	42	#include "entry.h"
062ea6d3	43
1da177e4 LT	44	/* {set, get}context() needed for 64-bit SparcLinux userland. */
	45	asmlinkage void sparc64_set_context(struct pt_regs *regs)
	46	{
	47	struct ucontext __user ucp = (struct ucontext __user )
	48	regs->u_regs[UREG_I0];
812cb83a	49	enum ctx_state prev_state = exception_enter();
1da177e4 LT	50	mc_gregset_t __user *grp;
	51	unsigned long pc, npc, tstate;
	52	unsigned long fp, i7;
	53	unsigned char fenab;
	54	int err;
	55
397d1533	56	synchronize_user_stack();
1da177e4 LT	57	if (get_thread_wsaved() \|\|
	58	(((unsigned long)ucp) & (sizeof(unsigned long)-1)) \|\|
	59	(!__access_ok(ucp, sizeof(*ucp))))
	60	goto do_sigsegv;
	61	grp = &ucp->uc_mcontext.mc_gregs;
	62	err = __get_user(pc, &((*grp)[MC_PC]));
	63	err \|= __get_user(npc, &((*grp)[MC_NPC]));
	64	if (err \|\| ((pc \| npc) & 3))
	65	goto do_sigsegv;
	66	if (regs->u_regs[UREG_I1]) {
	67	sigset_t set;
	68
	69	if (_NSIG_WORDS == 1) {
	70	if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
	71	goto do_sigsegv;
	72	} else {
	73	if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
	74	goto do_sigsegv;
	75	}
faddf598	76	set_current_blocked(&set);
1da177e4 LT	77	}
	78	if (test_thread_flag(TIF_32BIT)) {
	79	pc &= 0xffffffff;
	80	npc &= 0xffffffff;
	81	}
	82	regs->tpc = pc;
	83	regs->tnpc = npc;
	84	err \|= __get_user(regs->y, &((*grp)[MC_Y]));
	85	err \|= __get_user(tstate, &((*grp)[MC_TSTATE]));
	86	regs->tstate &= ~(TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC);
	87	regs->tstate \|= (tstate & (TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC));
	88	err \|= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
	89	err \|= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
	90	err \|= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
	91	err \|= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
	92	err \|= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
	93	err \|= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
0a4949c4 DM	94
	95	/* Skip %g7 as that's the thread register in userspace. */
	96
1da177e4 LT	97	err \|= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
	98	err \|= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
	99	err \|= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
	100	err \|= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
	101	err \|= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
	102	err \|= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
	103	err \|= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
	104	err \|= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
	105
	106	err \|= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
	107	err \|= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
	108	err \|= __put_user(fp,
	109	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
	110	err \|= __put_user(i7,
	111	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
	112
	113	err \|= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
	114	if (fenab) {
	115	unsigned long *fpregs = current_thread_info()->fpregs;
	116	unsigned long fprs;
	117
	118	fprs_write(0);
	119	err \|= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
	120	if (fprs & FPRS_DL)
	121	err \|= copy_from_user(fpregs,
	122	&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
	123	(sizeof(unsigned int) * 32));
	124	if (fprs & FPRS_DU)
	125	err \|= copy_from_user(fpregs+16,
	126	((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
	127	(sizeof(unsigned int) * 32));
	128	err \|= __get_user(current_thread_info()->xfsr[0],
	129	&(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
	130	err \|= __get_user(current_thread_info()->gsr[0],
	131	&(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
	132	regs->tstate &= ~TSTATE_PEF;
	133	}
	134	if (err)
	135	goto do_sigsegv;
812cb83a KT	136	out:
812cb83a KT	137	exception_exit(prev_state);
1da177e4 LT	138	return;
	139	do_sigsegv:
	140	force_sig(SIGSEGV, current);
812cb83a	141	goto out;
1da177e4 LT	142	}
	143
	144	asmlinkage void sparc64_get_context(struct pt_regs *regs)
	145	{
	146	struct ucontext __user ucp = (struct ucontext __user )
	147	regs->u_regs[UREG_I0];
812cb83a	148	enum ctx_state prev_state = exception_enter();
1da177e4 LT	149	mc_gregset_t __user *grp;
	150	mcontext_t __user *mcp;
	151	unsigned long fp, i7;
	152	unsigned char fenab;
	153	int err;
	154
	155	synchronize_user_stack();
	156	if (get_thread_wsaved() \|\| clear_user(ucp, sizeof(*ucp)))
	157	goto do_sigsegv;
	158
	159	#if 1
	160	fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
	161	#else
	162	fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
	163	#endif
	164
	165	mcp = &ucp->uc_mcontext;
	166	grp = &mcp->mc_gregs;
	167
	168	/* Skip over the trap instruction, first. */
	169	if (test_thread_flag(TIF_32BIT)) {
	170	regs->tpc = (regs->tnpc & 0xffffffff);
	171	regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
	172	} else {
	173	regs->tpc = regs->tnpc;
	174	regs->tnpc += 4;
	175	}
	176	err = 0;
	177	if (_NSIG_WORDS == 1)
	178	err \|= __put_user(current->blocked.sig[0],
	179	(unsigned long __user *)&ucp->uc_sigmask);
	180	else
	181	err \|= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
	182	sizeof(sigset_t));
	183
	184	err \|= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
	185	err \|= __put_user(regs->tpc, &((*grp)[MC_PC]));
	186	err \|= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
	187	err \|= __put_user(regs->y, &((*grp)[MC_Y]));
	188	err \|= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
	189	err \|= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
	190	err \|= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
	191	err \|= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
	192	err \|= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
	193	err \|= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
	194	err \|= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
	195	err \|= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
	196	err \|= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
	197	err \|= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
	198	err \|= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
	199	err \|= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
	200	err \|= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
	201	err \|= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
	202	err \|= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
	203
	204	err \|= __get_user(fp,
	205	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
	206	err \|= __get_user(i7,
	207	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
	208	err \|= __put_user(fp, &(mcp->mc_fp));
	209	err \|= __put_user(i7, &(mcp->mc_i7));
	210
	211	err \|= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
	212	if (fenab) {
213	unsigned long *fpregs = current_thread_info()->fpregs;
214	unsigned long fprs;
215
216	fprs = current_thread_info()->fpsaved[0];
217	if (fprs & FPRS_DL)
218	err \|= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
219	(sizeof(unsigned int) * 32));
220	if (fprs & FPRS_DU)
221	err \|= copy_to_user(
222	((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
223	(sizeof(unsigned int) * 32));
224	err \|= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
225	err \|= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
226	err \|= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
227	}
228	if (err)
229	goto do_sigsegv;
812cb83a KT	230	out:
812cb83a KT	231	exception_exit(prev_state);
1da177e4 LT	232	return;
	233	do_sigsegv:
	234	force_sig(SIGSEGV, current);
812cb83a	235	goto out;
1da177e4 LT	236	}
1da177e4 LT	237
d11c2a0d DM	238	/* Checks if the fp is valid. We always build rt signal frames which
	239	* are 16-byte aligned, therefore we can always enforce that the
	240	* restore frame has that property as well.
	241	*/
	242	static bool invalid_frame_pointer(void __user *fp)
	243	{
	244	if (((unsigned long) fp) & 15)
	245	return true;
	246	return false;
	247	}
	248
1da177e4 LT	249	struct rt_signal_frame {
	250	struct sparc_stackf ss;
	251	siginfo_t info;
	252	struct pt_regs regs;
	253	__siginfo_fpu_t __user *fpu_save;
	254	stack_t stack;
	255	sigset_t mask;
5598473a	256	__siginfo_rwin_t *rwin_save;
1da177e4 LT	257	};
1da177e4 LT	258
1da177e4 LT	259	void do_rt_sigreturn(struct pt_regs *regs)
1da177e4 LT	260	{
d11c2a0d	261	unsigned long tpc, tnpc, tstate, ufp;
1da177e4	262	struct rt_signal_frame __user *sf;
1da177e4	263	__siginfo_fpu_t __user *fpu_save;
5598473a	264	__siginfo_rwin_t __user *rwin_save;
1da177e4	265	sigset_t set;
1da177e4 LT	266	int err;
	267
	268	/* Always make any pending restarted system calls return -EINTR */
f56141e3	269	current->restart_block.fn = do_no_restart_syscall;
1da177e4 LT	270
	271	synchronize_user_stack ();
	272	sf = (struct rt_signal_frame __user *)
	273	(regs->u_regs [UREG_FP] + STACK_BIAS);
	274
	275	/* 1. Make sure we are not getting garbage from the user */
d11c2a0d DM	276	if (invalid_frame_pointer(sf))
	277	goto segv;
	278
	279	if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
1da177e4 LT	280	goto segv;
1da177e4 LT	281
d11c2a0d DM	282	if ((ufp + STACK_BIAS) & 0x7)
	283	goto segv;
	284
	285	err = __get_user(tpc, &sf->regs.tpc);
1da177e4 LT	286	err \|= __get_user(tnpc, &sf->regs.tnpc);
	287	if (test_thread_flag(TIF_32BIT)) {
	288	tpc &= 0xffffffff;
	289	tnpc &= 0xffffffff;
	290	}
	291	err \|= ((tpc \| tnpc) & 3);
	292
	293	/* 2. Restore the state */
	294	err \|= __get_user(regs->y, &sf->regs.y);
	295	err \|= __get_user(tstate, &sf->regs.tstate);
	296	err \|= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
	297
	298	/* User can only change condition codes and %asi in %tstate. */
	299	regs->tstate &= ~(TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC);
	300	regs->tstate \|= (tstate & (TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC));
	301
	302	err \|= __get_user(fpu_save, &sf->fpu_save);
5598473a DM	303	if (!err && fpu_save)
5598473a DM	304	err \|= restore_fpu_state(regs, fpu_save);
1da177e4 LT	305
1da177e4 LT	306	err \|= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
99b06feb AV	307	err \|= restore_altstack(&sf->stack);
99b06feb AV	308	if (err)
1da177e4	309	goto segv;
62715ec8	310
5598473a DM	311	err \|= __get_user(rwin_save, &sf->rwin_save);
	312	if (!err && rwin_save) {
	313	if (restore_rwin_state(rwin_save))
	314	goto segv;
	315	}
	316
1da177e4 LT	317	regs->tpc = tpc;
1da177e4 LT	318	regs->tnpc = tnpc;
1da177e4	319
2678fefe	320	/* Prevent syscall restart. */
28e61036	321	pt_regs_clear_syscall(regs);
2678fefe	322
faddf598	323	set_current_blocked(&set);
1da177e4 LT	324	return;
	325	segv:
	326	force_sig(SIGSEGV, current);
	327	}
	328
08f73957	329	static inline void __user get_sigframe(struct ksignal ksig, struct pt_regs *regs, unsigned long framesize)
1da177e4	330	{
dc5dc7e6	331	unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
1da177e4	332
dc5dc7e6 DM	333	/*
	334	* If we are on the alternate signal stack and would overflow it, don't.
	335	* Return an always-bogus address instead so we will die with SIGSEGV.
	336	*/
	337	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
	338	return (void __user *) -1L;
1da177e4 LT	339
1da177e4 LT	340	/* This is the X/Open sanctioned signal stack switching. */
08f73957	341	sp = sigsp(sp, ksig) - framesize;
f036d9f3	342
dc5dc7e6 DM	343	/* Always align the stack frame. This handles two cases. First,
	344	* sigaltstack need not be mindful of platform specific stack
	345	* alignment. Second, if we took this signal because the stack
	346	* is not aligned properly, we'd like to take the signal cleanly
	347	* and report that.
	348	*/
f036d9f3	349	sp &= ~15UL;
dc5dc7e6	350
f036d9f3	351	return (void __user *) sp;
1da177e4 LT	352	}
1da177e4 LT	353
392c2180	354	static inline int
08f73957	355	setup_rt_frame(struct ksignal ksig, struct pt_regs regs)
1da177e4 LT	356	{
1da177e4 LT	357	struct rt_signal_frame __user *sf;
5598473a DM	358	int wsaved, err, sf_size;
5598473a DM	359	void __user *tail;
1da177e4 LT	360
	361	/* 1. Make sure everything is clean */
	362	synchronize_user_stack();
	363	save_and_clear_fpu();
	364
5598473a	365	wsaved = get_thread_wsaved();
1da177e4	366
5598473a DM	367	sf_size = sizeof(struct rt_signal_frame);
	368	if (current_thread_info()->fpsaved[0] & FPRS_FEF)
	369	sf_size += sizeof(__siginfo_fpu_t);
	370	if (wsaved)
	371	sf_size += sizeof(__siginfo_rwin_t);
1da177e4	372	sf = (struct rt_signal_frame __user *)
08f73957	373	get_sigframe(ksig, regs, sf_size);
1da177e4	374
08f73957 AV	375	if (invalid_frame_pointer (sf)) {
	376	do_exit(SIGILL); /* won't return, actually */
	377	return -EINVAL;
	378	}
1da177e4	379
5598473a DM	380	tail = (sf + 1);
5598473a DM	381
1da177e4 LT	382	/* 2. Save the current process state */
	383	err = copy_to_user(&sf->regs, regs, sizeof (*regs));
	384
	385	if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
5598473a DM	386	__siginfo_fpu_t __user *fpu_save = tail;
	387	tail += sizeof(__siginfo_fpu_t);
	388	err \|= save_fpu_state(regs, fpu_save);
	389	err \|= __put_user((u64)fpu_save, &sf->fpu_save);
1da177e4 LT	390	} else {
	391	err \|= __put_user(0, &sf->fpu_save);
	392	}
5598473a DM	393	if (wsaved) {
	394	__siginfo_rwin_t __user *rwin_save = tail;
	395	tail += sizeof(__siginfo_rwin_t);
	396	err \|= save_rwin_state(wsaved, rwin_save);
	397	err \|= __put_user((u64)rwin_save, &sf->rwin_save);
	398	set_thread_wsaved(0);
	399	} else {
	400	err \|= __put_user(0, &sf->rwin_save);
	401	}
1da177e4 LT	402
1da177e4 LT	403	/* Setup sigaltstack */
99b06feb	404	err \|= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
1da177e4	405
08f73957	406	err \|= copy_to_user(&sf->mask, sigmask_to_save(), sizeof(sigset_t));
1da177e4	407
5598473a DM	408	if (!wsaved) {
	409	err \|= copy_in_user((u64 __user *)sf,
	410	(u64 __user *)(regs->u_regs[UREG_FP] +
	411	STACK_BIAS),
	412	sizeof(struct reg_window));
	413	} else {
	414	struct reg_window *rp;
1da177e4	415
5598473a DM	416	rp = &current_thread_info()->reg_window[wsaved - 1];
	417	err \|= copy_to_user(sf, rp, sizeof(struct reg_window));
	418	}
08f73957 AV	419	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
08f73957 AV	420	err \|= copy_siginfo_to_user(&sf->info, &ksig->info);
1da177e4	421	else {
08f73957	422	err \|= __put_user(ksig->sig, &sf->info.si_signo);
1da177e4 LT	423	err \|= __put_user(SI_NOINFO, &sf->info.si_code);
	424	}
	425	if (err)
08f73957	426	return err;
1da177e4 LT	427
	428	/* 3. signal handler back-trampoline and parameters */
	429	regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
08f73957	430	regs->u_regs[UREG_I0] = ksig->sig;
1da177e4 LT	431	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
	432
	433	/* The sigcontext is passed in this way because of how it
	434	* is defined in GLIBC's /usr/include/bits/sigcontext.h
	435	* for sparc64. It includes the 128 bytes of siginfo_t.
	436	*/
	437	regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
	438
	439	/* 5. signal handler */
08f73957	440	regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
1da177e4 LT	441	regs->tnpc = (regs->tpc + 4);
	442	if (test_thread_flag(TIF_32BIT)) {
	443	regs->tpc &= 0xffffffff;
	444	regs->tnpc &= 0xffffffff;
	445	}
	446	/* 4. return to kernel instructions */
08f73957	447	regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
392c2180	448	return 0;
1da177e4 LT	449	}
	450
	451	static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
28e61036	452	struct sigaction *sa)
1da177e4 LT	453	{
	454	switch (regs->u_regs[UREG_I0]) {
	455	case ERESTART_RESTARTBLOCK:
	456	case ERESTARTNOHAND:
	457	no_system_call_restart:
	458	regs->u_regs[UREG_I0] = EINTR;
	459	regs->tstate \|= (TSTATE_ICARRY\|TSTATE_XCARRY);
	460	break;
	461	case ERESTARTSYS:
	462	if (!(sa->sa_flags & SA_RESTART))
	463	goto no_system_call_restart;
	464	/* fallthrough */
	465	case ERESTARTNOINTR:
	466	regs->u_regs[UREG_I0] = orig_i0;
	467	regs->tpc -= 4;
	468	regs->tnpc -= 4;
	469	}
	470	}
	471
	472	/* Note that 'init' is a special process: it doesn't get signals it doesn't
	473	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	474	* mistake.
	475	*/
238468b2	476	static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
1da177e4	477	{
08f73957	478	struct ksignal ksig;
28e61036	479	int restart_syscall;
08f73957	480	bool has_handler;
1da177e4	481
1d299bc7 DM	482	/* It's a lot of work and synchronization to add a new ptrace
	483	* register for GDB to save and restore in order to get
	484	* orig_i0 correct for syscall restarts when debugging.
	485	*
e88d2468 DM	486	* Although it should be the case that most of the global
	487	* registers are volatile across a system call, glibc already
	488	* depends upon that fact that we preserve them. So we can't
	489	* just use any global register to save away the orig_i0 value.
	490	*
	491	* In particular %g2, %g3, %g4, and %g5 are all assumed to be
	492	* preserved across a system call trap by various pieces of
	493	* code in glibc.
	494	*
	495	* %g7 is used as the "thread register". %g6 is not used in
	496	* any fixed manner. %g6 is used as a scratch register and
	497	* a compiler temporary, but it's value is never used across
	498	* a system call. Therefore %g6 is usable for orig_i0 storage.
1d299bc7	499	*/
2678fefe	500	if (pt_regs_is_syscall(regs) &&
1d299bc7	501	(regs->tstate & (TSTATE_XCARRY \| TSTATE_ICARRY)))
e88d2468	502	regs->u_regs[UREG_G6] = orig_i0;
1da177e4	503
09337f50	504	#ifdef CONFIG_COMPAT
1da177e4	505	if (test_thread_flag(TIF_32BIT)) {
08f73957	506	do_signal32(regs);
2d7d5f05	507	return;
1da177e4 LT	508	}
	509	#endif
	510
08f73957	511	has_handler = get_signal(&ksig);
28e61036	512
1d299bc7 DM	513	restart_syscall = 0;
	514	if (pt_regs_is_syscall(regs) &&
	515	(regs->tstate & (TSTATE_XCARRY \| TSTATE_ICARRY))) {
	516	restart_syscall = 1;
e88d2468	517	orig_i0 = regs->u_regs[UREG_G6];
1d299bc7	518	}
28e61036	519
08f73957	520	if (has_handler) {
28e61036	521	if (restart_syscall)
08f73957 AV	522	syscall_restart(orig_i0, regs, &ksig.ka.sa);
	523	signal_setup_done(setup_rt_frame(&ksig, regs), &ksig, 0);
	524	} else {
	525	if (restart_syscall) {
	526	switch (regs->u_regs[UREG_I0]) {
	527	case ERESTARTNOHAND:
	528	case ERESTARTSYS:
	529	case ERESTARTNOINTR:
	530	/* replay the system call when we are done */
	531	regs->u_regs[UREG_I0] = orig_i0;
	532	regs->tpc -= 4;
	533	regs->tnpc -= 4;
	534	pt_regs_clear_syscall(regs);
	535	case ERESTART_RESTARTBLOCK:
	536	regs->u_regs[UREG_G1] = __NR_restart_syscall;
	537	regs->tpc -= 4;
	538	regs->tnpc -= 4;
	539	pt_regs_clear_syscall(regs);
	540	}
	541	}
	542	restore_saved_sigmask();
1da177e4	543	}
1da177e4 LT	544	}
1da177e4 LT	545
7697daaa	546	void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
1da177e4	547	{
812cb83a	548	user_exit();
e8f4aa60 AP	549	if (thread_info_flags & _TIF_UPROBE)
e8f4aa60 AP	550	uprobe_notify_resume(regs);
9a28dbf8	551	if (thread_info_flags & _TIF_SIGPENDING)
238468b2	552	do_signal(regs, orig_i0);
e35a8925 RM	553	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	554	clear_thread_flag(TIF_NOTIFY_RESUME);
	555	tracehook_notify_resume(regs);
	556	}
812cb83a	557	user_enter();
1da177e4	558	}
ee18d64c	559