[net-next-2.6.git] / arch / sparc64 / kernel / signal.c

/*  $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $
 *  arch/sparc64/kernel/signal.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 *  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/unistd.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/binfmts.h>
#include <linux/bitops.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 "entry.h"
#include "systbls.h"

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

/* {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];
	mc_gregset_t __user *grp;
	unsigned long pc, npc, tstate;
	unsigned long fp, i7;
	unsigned char fenab;
	int err;

	flush_user_windows();
	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;
		}
		sigdelsetmask(&set, ~_BLOCKABLE);
		spin_lock_irq(&current->sighand->siglock);
		current->blocked = set;
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}
	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]));
	err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
	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;

	return;
do_sigsegv:
	force_sig(SIGSEGV, current);
}

asmlinkage void sparc64_get_context(struct pt_regs *regs)
{
	struct ucontext __user *ucp = (struct ucontext __user *)
		regs->u_regs[UREG_I0];
	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;

	return;
do_sigsegv:
	force_sig(SIGSEGV, current);
}

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_fpu_t		fpu_state;
};

static long _sigpause_common(old_sigset_t set)
{
	set &= _BLOCKABLE;
	spin_lock_irq(&current->sighand->siglock);
	current->saved_sigmask = current->blocked;
	siginitset(&current->blocked, set);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	current->state = TASK_INTERRUPTIBLE;
	schedule();
	set_thread_flag(TIF_RESTORE_SIGMASK);
	return -ERESTARTNOHAND;
}

asmlinkage long sys_sigpause(unsigned int set)
{
	return _sigpause_common(set);
}

asmlinkage long sys_sigsuspend(old_sigset_t set)
{
	return _sigpause_common(set);
}

static inline int
restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
{
	unsigned long *fpregs = current_thread_info()->fpregs;
	unsigned long fprs;
	int err;

	err = __get_user(fprs, &fpu->si_fprs);
	fprs_write(0);
	regs->tstate &= ~TSTATE_PEF;
	if (fprs & FPRS_DL)
		err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
		       	       (sizeof(unsigned int) * 32));
	if (fprs & FPRS_DU)
		err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
		       	       (sizeof(unsigned int) * 32));
	err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
	err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
	current_thread_info()->fpsaved[0] |= fprs;
	return err;
}

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

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->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 (((unsigned long) sf) & 3)
		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 (fpu_save)
		err |= restore_fpu_state(regs, &sf->fpu_state);

	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
	err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);

	if (err)
		goto segv;

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

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

	sigdelsetmask(&set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);
	return;
segv:
	force_sig(SIGSEGV, current);
}

/* Checks if the fp is valid */
static int invalid_frame_pointer(void __user *fp, int fplen)
{
	if (((unsigned long) fp) & 7)
		return 1;
	return 0;
}

static inline int
save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
{
	unsigned long *fpregs = current_thread_info()->fpregs;
	unsigned long fprs;
	int err = 0;
	
	fprs = current_thread_info()->fpsaved[0];
	if (fprs & FPRS_DL)
		err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
				    (sizeof(unsigned int) * 32));
	if (fprs & FPRS_DU)
		err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
				    (sizeof(unsigned int) * 32));
	err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
	err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
	err |= __put_user(fprs, &fpu->si_fprs);

	return err;
}

static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
{
	unsigned long sp;

	sp = regs->u_regs[UREG_FP] + STACK_BIAS;

	/* This is the X/Open sanctioned signal stack switching.  */
	if (ka->sa.sa_flags & SA_ONSTACK) {
		if (!on_sig_stack(sp) &&
		    !((current->sas_ss_sp + current->sas_ss_size) & 7))
			sp = current->sas_ss_sp + current->sas_ss_size;
	}
	return (void __user *)(sp - framesize);
}

static inline void
setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
	       int signo, sigset_t *oldset, siginfo_t *info)
{
	struct rt_signal_frame __user *sf;
	int sigframe_size, err;

	/* 1. Make sure everything is clean */
	synchronize_user_stack();
	save_and_clear_fpu();
	
	sigframe_size = sizeof(struct rt_signal_frame);
	if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
		sigframe_size -= sizeof(__siginfo_fpu_t);

	sf = (struct rt_signal_frame __user *)
		get_sigframe(ka, regs, sigframe_size);
	
	if (invalid_frame_pointer (sf, sigframe_size))
		goto sigill;

	if (get_thread_wsaved() != 0)
		goto sigill;

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

	if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
		err |= save_fpu_state(regs, &sf->fpu_state);
		err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
	} else {
		err |= __put_user(0, &sf->fpu_save);
	}
	
	/* Setup sigaltstack */
	err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
	err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
	err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);

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

	err |= copy_in_user((u64 __user *)sf,
			    (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
			    sizeof(struct reg_window));

	if (info)
		err |= copy_siginfo_to_user(&sf->info, info);
	else {
		err |= __put_user(signo, &sf->info.si_signo);
		err |= __put_user(SI_NOINFO, &sf->info.si_code);
	}
	if (err)
		goto sigsegv;
	
	/* 3. signal handler back-trampoline and parameters */
	regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
	regs->u_regs[UREG_I0] = signo;
	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) 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)ka->ka_restorer;
	return;

sigill:
	do_exit(SIGILL);
sigsegv:
	force_sigsegv(signo, current);
}

static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
				 siginfo_t *info,
				 sigset_t *oldset, struct pt_regs *regs)
{
	setup_rt_frame(ka, regs, signr, oldset,
		       (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
	spin_lock_irq(&current->sighand->siglock);
	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	if (!(ka->sa.sa_flags & SA_NOMASK))
		sigaddset(&current->blocked,signr);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);
}

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 signal_deliver_cookie cookie;
	struct k_sigaction ka;
	sigset_t *oldset;
	siginfo_t info;
	int signr;
	
	if (pt_regs_is_syscall(regs) &&
	    (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
		pt_regs_clear_trap_type(regs);
		cookie.restart_syscall = 1;
	} else
		cookie.restart_syscall = 0;
	cookie.orig_i0 = orig_i0;

	if (test_thread_flag(TIF_RESTORE_SIGMASK))
		oldset = &current->saved_sigmask;
	else
		oldset = &current->blocked;

#ifdef CONFIG_COMPAT
	if (test_thread_flag(TIF_32BIT)) {
		extern void do_signal32(sigset_t *, struct pt_regs *,
					struct signal_deliver_cookie *);
		do_signal32(oldset, regs, &cookie);
		return;
	}
#endif	

	signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
	if (signr > 0) {
		if (cookie.restart_syscall)
			syscall_restart(cookie.orig_i0, regs, &ka.sa);
		handle_signal(signr, &ka, &info, oldset, regs);

		/* a signal was successfully delivered; the saved
		 * sigmask will have been stored in the signal frame,
		 * and will be restored by sigreturn, so we can simply
		 * clear the TIF_RESTORE_SIGMASK flag.
		 */
		if (test_thread_flag(TIF_RESTORE_SIGMASK))
			clear_thread_flag(TIF_RESTORE_SIGMASK);
		return;
	}
	if (cookie.restart_syscall &&
	    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
	     regs->u_regs[UREG_I0] == ERESTARTSYS ||
	     regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
		/* replay the system call when we are done */
		regs->u_regs[UREG_I0] = cookie.orig_i0;
		regs->tpc -= 4;
		regs->tnpc -= 4;
	}
	if (cookie.restart_syscall &&
	    regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
		regs->u_regs[UREG_G1] = __NR_restart_syscall;
		regs->tpc -= 4;
		regs->tnpc -= 4;
	}

	/* if there's no signal to deliver, we just put the saved sigmask
	 * back
	 */
	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
		clear_thread_flag(TIF_RESTORE_SIGMASK);
		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	}
}

void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
{
	if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
		do_signal(regs, orig_i0);
}

void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
{
	struct signal_deliver_cookie *cp = cookie;

	if (cp->restart_syscall &&
	    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
	     regs->u_regs[UREG_I0] == ERESTARTSYS ||
	     regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
		/* replay the system call when we are done */
		regs->u_regs[UREG_I0] = cp->orig_i0;
		regs->tpc -= 4;
		regs->tnpc -= 4;
		cp->restart_syscall = 0;
	}
	if (cp->restart_syscall &&
	    regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
		regs->u_regs[UREG_G1] = __NR_restart_syscall;
		regs->tpc -= 4;
		regs->tnpc -= 4;
		cp->restart_syscall = 0;
	}
}
Commit	Line	Data
1da177e4 LT	1	/* $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $
	2	* arch/sparc64/kernel/signal.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
	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>
	20	#include <linux/unistd.h>
	21	#include <linux/mm.h>
	22	#include <linux/tty.h>
1da177e4 LT	23	#include <linux/binfmts.h>
	24	#include <linux/bitops.h>
	25
	26	#include <asm/uaccess.h>
	27	#include <asm/ptrace.h>
1da177e4 LT	28	#include <asm/pgtable.h>
	29	#include <asm/fpumacro.h>
	30	#include <asm/uctx.h>
	31	#include <asm/siginfo.h>
	32	#include <asm/visasm.h>
	33
062ea6d3 DM	34	#include "entry.h"
	35	#include "systbls.h"
	36
1da177e4 LT	37	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
1da177e4 LT	38
1da177e4 LT	39	/* {set, get}context() needed for 64-bit SparcLinux userland. */
	40	asmlinkage void sparc64_set_context(struct pt_regs *regs)
	41	{
	42	struct ucontext __user ucp = (struct ucontext __user )
	43	regs->u_regs[UREG_I0];
	44	mc_gregset_t __user *grp;
	45	unsigned long pc, npc, tstate;
	46	unsigned long fp, i7;
	47	unsigned char fenab;
	48	int err;
	49
	50	flush_user_windows();
	51	if (get_thread_wsaved() \|\|
	52	(((unsigned long)ucp) & (sizeof(unsigned long)-1)) \|\|
	53	(!__access_ok(ucp, sizeof(*ucp))))
	54	goto do_sigsegv;
	55	grp = &ucp->uc_mcontext.mc_gregs;
	56	err = __get_user(pc, &((*grp)[MC_PC]));
	57	err \|= __get_user(npc, &((*grp)[MC_NPC]));
	58	if (err \|\| ((pc \| npc) & 3))
	59	goto do_sigsegv;
	60	if (regs->u_regs[UREG_I1]) {
	61	sigset_t set;
	62
	63	if (_NSIG_WORDS == 1) {
	64	if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
	65	goto do_sigsegv;
	66	} else {
	67	if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
	68	goto do_sigsegv;
	69	}
	70	sigdelsetmask(&set, ~_BLOCKABLE);
	71	spin_lock_irq(&current->sighand->siglock);
	72	current->blocked = set;
	73	recalc_sigpending();
	74	spin_unlock_irq(&current->sighand->siglock);
	75	}
	76	if (test_thread_flag(TIF_32BIT)) {
	77	pc &= 0xffffffff;
	78	npc &= 0xffffffff;
	79	}
	80	regs->tpc = pc;
	81	regs->tnpc = npc;
	82	err \|= __get_user(regs->y, &((*grp)[MC_Y]));
	83	err \|= __get_user(tstate, &((*grp)[MC_TSTATE]));
	84	regs->tstate &= ~(TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC);
	85	regs->tstate \|= (tstate & (TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC));
	86	err \|= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
	87	err \|= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
	88	err \|= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
	89	err \|= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
	90	err \|= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
	91	err \|= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
	92	err \|= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
	93	err \|= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
	94	err \|= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
	95	err \|= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
	96	err \|= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
	97	err \|= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
	98	err \|= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
	99	err \|= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
	100	err \|= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
	101
	102	err \|= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
103	err \|= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
104	err \|= __put_user(fp,
105	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
106	err \|= __put_user(i7,
107	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
108
109	err \|= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
110	if (fenab) {
111	unsigned long *fpregs = current_thread_info()->fpregs;
112	unsigned long fprs;
113
114	fprs_write(0);
115	err \|= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
116	if (fprs & FPRS_DL)
117	err \|= copy_from_user(fpregs,
118	&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
119	(sizeof(unsigned int) * 32));
120	if (fprs & FPRS_DU)
121	err \|= copy_from_user(fpregs+16,
122	((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
123	(sizeof(unsigned int) * 32));
124	err \|= __get_user(current_thread_info()->xfsr[0],
125	&(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
126	err \|= __get_user(current_thread_info()->gsr[0],
127	&(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
128	regs->tstate &= ~TSTATE_PEF;
129	}
130	if (err)
131	goto do_sigsegv;
132
133	return;
134	do_sigsegv:
135	force_sig(SIGSEGV, current);
136	}
137
138	asmlinkage void sparc64_get_context(struct pt_regs *regs)
139	{
140	struct ucontext __user ucp = (struct ucontext __user )
141	regs->u_regs[UREG_I0];
142	mc_gregset_t __user *grp;
143	mcontext_t __user *mcp;
144	unsigned long fp, i7;
145	unsigned char fenab;
146	int err;
147
148	synchronize_user_stack();
149	if (get_thread_wsaved() \|\| clear_user(ucp, sizeof(*ucp)))
150	goto do_sigsegv;
151
152	#if 1
153	fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
154	#else
155	fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
156	#endif
157
158	mcp = &ucp->uc_mcontext;
159	grp = &mcp->mc_gregs;
160
161	/* Skip over the trap instruction, first. */
162	if (test_thread_flag(TIF_32BIT)) {
163	regs->tpc = (regs->tnpc & 0xffffffff);
164	regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
165	} else {
166	regs->tpc = regs->tnpc;
167	regs->tnpc += 4;
168	}
169	err = 0;
170	if (_NSIG_WORDS == 1)
171	err \|= __put_user(current->blocked.sig[0],
172	(unsigned long __user *)&ucp->uc_sigmask);
173	else
174	err \|= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
175	sizeof(sigset_t));
176
177	err \|= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
178	err \|= __put_user(regs->tpc, &((*grp)[MC_PC]));
179	err \|= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
180	err \|= __put_user(regs->y, &((*grp)[MC_Y]));
181	err \|= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
182	err \|= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
183	err \|= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
184	err \|= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
185	err \|= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
186	err \|= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
187	err \|= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
188	err \|= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
189	err \|= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
190	err \|= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
191	err \|= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
192	err \|= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
193	err \|= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
194	err \|= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
195	err \|= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
196
197	err \|= __get_user(fp,
198	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
199	err \|= __get_user(i7,
200	(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
201	err \|= __put_user(fp, &(mcp->mc_fp));
202	err \|= __put_user(i7, &(mcp->mc_i7));
203
204	err \|= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
205	if (fenab) {
206	unsigned long *fpregs = current_thread_info()->fpregs;
207	unsigned long fprs;
208
209	fprs = current_thread_info()->fpsaved[0];
210	if (fprs & FPRS_DL)
211	err \|= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
212	(sizeof(unsigned int) * 32));
213	if (fprs & FPRS_DU)
214	err \|= copy_to_user(
215	((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
216	(sizeof(unsigned int) * 32));
217	err \|= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
218	err \|= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
219	err \|= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
220	}
221	if (err)
222	goto do_sigsegv;
223
224	return;
225	do_sigsegv:
226	force_sig(SIGSEGV, current);
227	}
228
229	struct rt_signal_frame {
230	struct sparc_stackf ss;
231	siginfo_t info;
232	struct pt_regs regs;
233	__siginfo_fpu_t __user *fpu_save;
234	stack_t stack;
235	sigset_t mask;
236	__siginfo_fpu_t fpu_state;
237	};
238
2d7d5f05	239	static long _sigpause_common(old_sigset_t set)
1da177e4	240	{
1da177e4 LT	241	set &= _BLOCKABLE;
1da177e4 LT	242	spin_lock_irq(&current->sighand->siglock);
2d7d5f05	243	current->saved_sigmask = current->blocked;
1da177e4 LT	244	siginitset(&current->blocked, set);
	245	recalc_sigpending();
	246	spin_unlock_irq(&current->sighand->siglock);
1da177e4	247
2d7d5f05 DM	248	current->state = TASK_INTERRUPTIBLE;
	249	schedule();
	250	set_thread_flag(TIF_RESTORE_SIGMASK);
	251	return -ERESTARTNOHAND;
1da177e4 LT	252	}
1da177e4 LT	253
2d7d5f05	254	asmlinkage long sys_sigpause(unsigned int set)
1da177e4	255	{
2d7d5f05	256	return _sigpause_common(set);
1da177e4 LT	257	}
1da177e4 LT	258
2d7d5f05	259	asmlinkage long sys_sigsuspend(old_sigset_t set)
1da177e4	260	{
2d7d5f05	261	return _sigpause_common(set);
1da177e4 LT	262	}
	263
	264	static inline int
	265	restore_fpu_state(struct pt_regs regs, __siginfo_fpu_t __user fpu)
	266	{
	267	unsigned long *fpregs = current_thread_info()->fpregs;
	268	unsigned long fprs;
	269	int err;
	270
	271	err = __get_user(fprs, &fpu->si_fprs);
	272	fprs_write(0);
	273	regs->tstate &= ~TSTATE_PEF;
	274	if (fprs & FPRS_DL)
	275	err \|= copy_from_user(fpregs, &fpu->si_float_regs[0],
	276	(sizeof(unsigned int) * 32));
	277	if (fprs & FPRS_DU)
	278	err \|= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
	279	(sizeof(unsigned int) * 32));
	280	err \|= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
	281	err \|= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
	282	current_thread_info()->fpsaved[0] \|= fprs;
	283	return err;
	284	}
	285
	286	void do_rt_sigreturn(struct pt_regs *regs)
	287	{
	288	struct rt_signal_frame __user *sf;
	289	unsigned long tpc, tnpc, tstate;
	290	__siginfo_fpu_t __user *fpu_save;
1da177e4	291	sigset_t set;
1da177e4 LT	292	int err;
	293
	294	/* Always make any pending restarted system calls return -EINTR */
	295	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	296
	297	synchronize_user_stack ();
	298	sf = (struct rt_signal_frame __user *)
	299	(regs->u_regs [UREG_FP] + STACK_BIAS);
	300
	301	/* 1. Make sure we are not getting garbage from the user */
	302	if (((unsigned long) sf) & 3)
	303	goto segv;
	304
	305	err = get_user(tpc, &sf->regs.tpc);
	306	err \|= __get_user(tnpc, &sf->regs.tnpc);
	307	if (test_thread_flag(TIF_32BIT)) {
	308	tpc &= 0xffffffff;
	309	tnpc &= 0xffffffff;
	310	}
	311	err \|= ((tpc \| tnpc) & 3);
	312
	313	/* 2. Restore the state */
	314	err \|= __get_user(regs->y, &sf->regs.y);
	315	err \|= __get_user(tstate, &sf->regs.tstate);
	316	err \|= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
	317
	318	/* User can only change condition codes and %asi in %tstate. */
	319	regs->tstate &= ~(TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC);
	320	regs->tstate \|= (tstate & (TSTATE_ASI \| TSTATE_ICC \| TSTATE_XCC));
	321
	322	err \|= __get_user(fpu_save, &sf->fpu_save);
	323	if (fpu_save)
	324	err \|= restore_fpu_state(regs, &sf->fpu_state);
	325
	326	err \|= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
62715ec8 ON	327	err \|= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
62715ec8 ON	328
1da177e4 LT	329	if (err)
1da177e4 LT	330	goto segv;
62715ec8	331
1da177e4 LT	332	regs->tpc = tpc;
1da177e4 LT	333	regs->tnpc = tnpc;
1da177e4	334
2678fefe DM	335	/* Prevent syscall restart. */
	336	pt_regs_clear_trap_type(regs);
	337
1da177e4 LT	338	sigdelsetmask(&set, ~_BLOCKABLE);
	339	spin_lock_irq(&current->sighand->siglock);
	340	current->blocked = set;
	341	recalc_sigpending();
	342	spin_unlock_irq(&current->sighand->siglock);
	343	return;
	344	segv:
	345	force_sig(SIGSEGV, current);
	346	}
	347
	348	/* Checks if the fp is valid */
	349	static int invalid_frame_pointer(void __user *fp, int fplen)
	350	{
	351	if (((unsigned long) fp) & 7)
	352	return 1;
	353	return 0;
	354	}
	355
	356	static inline int
	357	save_fpu_state(struct pt_regs regs, __siginfo_fpu_t __user fpu)
	358	{
7c3cce97	359	unsigned long *fpregs = current_thread_info()->fpregs;
1da177e4 LT	360	unsigned long fprs;
	361	int err = 0;
	362
	363	fprs = current_thread_info()->fpsaved[0];
	364	if (fprs & FPRS_DL)
	365	err \|= copy_to_user(&fpu->si_float_regs[0], fpregs,
	366	(sizeof(unsigned int) * 32));
	367	if (fprs & FPRS_DU)
	368	err \|= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
	369	(sizeof(unsigned int) * 32));
	370	err \|= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
	371	err \|= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
	372	err \|= __put_user(fprs, &fpu->si_fprs);
	373
	374	return err;
	375	}
	376
	377	static inline void __user get_sigframe(struct k_sigaction ka, struct pt_regs *regs, unsigned long framesize)
	378	{
	379	unsigned long sp;
	380
	381	sp = regs->u_regs[UREG_FP] + STACK_BIAS;
	382
	383	/* This is the X/Open sanctioned signal stack switching. */
	384	if (ka->sa.sa_flags & SA_ONSTACK) {
	385	if (!on_sig_stack(sp) &&
	386	!((current->sas_ss_sp + current->sas_ss_size) & 7))
	387	sp = current->sas_ss_sp + current->sas_ss_size;
	388	}
	389	return (void __user *)(sp - framesize);
	390	}
	391
	392	static inline void
	393	setup_rt_frame(struct k_sigaction ka, struct pt_regs regs,
	394	int signo, sigset_t oldset, siginfo_t info)
	395	{
	396	struct rt_signal_frame __user *sf;
	397	int sigframe_size, err;
	398
	399	/* 1. Make sure everything is clean */
	400	synchronize_user_stack();
	401	save_and_clear_fpu();
	402
7cf06995	403	sigframe_size = sizeof(struct rt_signal_frame);
1da177e4 LT	404	if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
	405	sigframe_size -= sizeof(__siginfo_fpu_t);
	406
	407	sf = (struct rt_signal_frame __user *)
	408	get_sigframe(ka, regs, sigframe_size);
	409
	410	if (invalid_frame_pointer (sf, sigframe_size))
	411	goto sigill;
	412
	413	if (get_thread_wsaved() != 0)
	414	goto sigill;
	415
	416	/* 2. Save the current process state */
	417	err = copy_to_user(&sf->regs, regs, sizeof (*regs));
	418
	419	if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
	420	err \|= save_fpu_state(regs, &sf->fpu_state);
	421	err \|= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
	422	} else {
	423	err \|= __put_user(0, &sf->fpu_save);
	424	}
	425
	426	/* Setup sigaltstack */
	427	err \|= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
	428	err \|= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
	429	err \|= __put_user(current->sas_ss_size, &sf->stack.ss_size);
	430
	431	err \|= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
	432
	433	err \|= copy_in_user((u64 __user *)sf,
	434	(u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
	435	sizeof(struct reg_window));
	436
	437	if (info)
	438	err \|= copy_siginfo_to_user(&sf->info, info);
	439	else {
	440	err \|= __put_user(signo, &sf->info.si_signo);
	441	err \|= __put_user(SI_NOINFO, &sf->info.si_code);
	442	}
	443	if (err)
	444	goto sigsegv;
	445
	446	/* 3. signal handler back-trampoline and parameters */
	447	regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
	448	regs->u_regs[UREG_I0] = signo;
	449	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
	450
	451	/* The sigcontext is passed in this way because of how it
	452	* is defined in GLIBC's /usr/include/bits/sigcontext.h
	453	* for sparc64. It includes the 128 bytes of siginfo_t.
	454	*/
	455	regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
	456
	457	/* 5. signal handler */
	458	regs->tpc = (unsigned long) ka->sa.sa_handler;
	459	regs->tnpc = (regs->tpc + 4);
	460	if (test_thread_flag(TIF_32BIT)) {
	461	regs->tpc &= 0xffffffff;
	462	regs->tnpc &= 0xffffffff;
	463	}
	464	/* 4. return to kernel instructions */
	465	regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
	466	return;
	467
468	sigill:
469	do_exit(SIGILL);
470	sigsegv:
471	force_sigsegv(signo, current);
472	}
473
474	static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
475	siginfo_t *info,
476	sigset_t oldset, struct pt_regs regs)
477	{
478	setup_rt_frame(ka, regs, signr, oldset,
479	(ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
69be8f18 SR	480	spin_lock_irq(&current->sighand->siglock);
	481	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	482	if (!(ka->sa.sa_flags & SA_NOMASK))
1da177e4	483	sigaddset(&current->blocked,signr);
69be8f18 SR	484	recalc_sigpending();
69be8f18 SR	485	spin_unlock_irq(&current->sighand->siglock);
1da177e4 LT	486	}
	487
	488	static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
	489	struct sigaction *sa)
	490	{
	491	switch (regs->u_regs[UREG_I0]) {
	492	case ERESTART_RESTARTBLOCK:
	493	case ERESTARTNOHAND:
	494	no_system_call_restart:
	495	regs->u_regs[UREG_I0] = EINTR;
	496	regs->tstate \|= (TSTATE_ICARRY\|TSTATE_XCARRY);
	497	break;
	498	case ERESTARTSYS:
	499	if (!(sa->sa_flags & SA_RESTART))
	500	goto no_system_call_restart;
	501	/* fallthrough */
	502	case ERESTARTNOINTR:
	503	regs->u_regs[UREG_I0] = orig_i0;
	504	regs->tpc -= 4;
	505	regs->tnpc -= 4;
	506	}
	507	}
	508
	509	/* Note that 'init' is a special process: it doesn't get signals it doesn't
	510	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	511	* mistake.
	512	*/
238468b2	513	static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
1da177e4	514	{
1da177e4 LT	515	struct signal_deliver_cookie cookie;
1da177e4 LT	516	struct k_sigaction ka;
2d7d5f05	517	sigset_t *oldset;
238468b2	518	siginfo_t info;
90888816	519	int signr;
1da177e4	520
2678fefe DM	521	if (pt_regs_is_syscall(regs) &&
2678fefe DM	522	(regs->tstate & (TSTATE_XCARRY \| TSTATE_ICARRY))) {
90888816	523	pt_regs_clear_trap_type(regs);
238468b2 DM	524	cookie.restart_syscall = 1;
	525	} else
	526	cookie.restart_syscall = 0;
1da177e4 LT	527	cookie.orig_i0 = orig_i0;
1da177e4 LT	528
2d7d5f05 DM	529	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	530	oldset = &current->saved_sigmask;
	531	else
1da177e4 LT	532	oldset = &current->blocked;
1da177e4 LT	533
09337f50	534	#ifdef CONFIG_COMPAT
1da177e4	535	if (test_thread_flag(TIF_32BIT)) {
2d7d5f05	536	extern void do_signal32(sigset_t , struct pt_regs ,
238468b2 DM	537	struct signal_deliver_cookie *);
238468b2 DM	538	do_signal32(oldset, regs, &cookie);
2d7d5f05	539	return;
1da177e4 LT	540	}
	541	#endif
	542
	543	signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
	544	if (signr > 0) {
	545	if (cookie.restart_syscall)
238468b2	546	syscall_restart(cookie.orig_i0, regs, &ka.sa);
1da177e4	547	handle_signal(signr, &ka, &info, oldset, regs);
2d7d5f05 DM	548
	549	/* a signal was successfully delivered; the saved
	550	* sigmask will have been stored in the signal frame,
	551	* and will be restored by sigreturn, so we can simply
	552	* clear the TIF_RESTORE_SIGMASK flag.
	553	*/
	554	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	555	clear_thread_flag(TIF_RESTORE_SIGMASK);
	556	return;
1da177e4 LT	557	}
	558	if (cookie.restart_syscall &&
	559	(regs->u_regs[UREG_I0] == ERESTARTNOHAND \|\|
	560	regs->u_regs[UREG_I0] == ERESTARTSYS \|\|
	561	regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
	562	/* replay the system call when we are done */
	563	regs->u_regs[UREG_I0] = cookie.orig_i0;
	564	regs->tpc -= 4;
	565	regs->tnpc -= 4;
	566	}
	567	if (cookie.restart_syscall &&
	568	regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
	569	regs->u_regs[UREG_G1] = __NR_restart_syscall;
	570	regs->tpc -= 4;
	571	regs->tnpc -= 4;
	572	}
2d7d5f05 DM	573
	574	/* if there's no signal to deliver, we just put the saved sigmask
	575	* back
	576	*/
	577	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
	578	clear_thread_flag(TIF_RESTORE_SIGMASK);
	579	sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	580	}
1da177e4 LT	581	}
1da177e4 LT	582
7697daaa	583	void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
1da177e4	584	{
2d7d5f05	585	if (thread_info_flags & (_TIF_SIGPENDING \| _TIF_RESTORE_SIGMASK))
238468b2	586	do_signal(regs, orig_i0);
1da177e4 LT	587	}
	588
	589	void ptrace_signal_deliver(struct pt_regs regs, void cookie)
	590	{
	591	struct signal_deliver_cookie *cp = cookie;
	592
	593	if (cp->restart_syscall &&
	594	(regs->u_regs[UREG_I0] == ERESTARTNOHAND \|\|
	595	regs->u_regs[UREG_I0] == ERESTARTSYS \|\|
	596	regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
	597	/* replay the system call when we are done */
	598	regs->u_regs[UREG_I0] = cp->orig_i0;
	599	regs->tpc -= 4;
	600	regs->tnpc -= 4;
	601	cp->restart_syscall = 0;
	602	}
	603	if (cp->restart_syscall &&
	604	regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
	605	regs->u_regs[UREG_G1] = __NR_restart_syscall;
	606	regs->tpc -= 4;
	607	regs->tnpc -= 4;
	608	cp->restart_syscall = 0;
	609	}
	610	}