arch/s390/kernel/compat_signal.c - arm/linux-arm64-legacy - Git at Google

 /*
  *  arch/s390/kernel/compat_signal.c
  *
  *    Copyright (C) IBM Corp. 2000,2006
  *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
  *               Gerhard Tonn (ton@de.ibm.com)
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
  *
  *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
  */

 #include <linux/compat.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
 #include <linux/smp_lock.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/stddef.h>
 #include <linux/tty.h>
 #include <linux/personality.h>
 #include <linux/binfmts.h>
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
 #include <asm/lowcore.h>
 #include "compat_linux.h"
 #include "compat_ptrace.h"

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

 typedef struct
 {
 	__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
 	struct sigcontext32 sc;
 	_sigregs32 sregs;
 	int signo;
 	__u8 retcode[S390_SYSCALL_SIZE];
 } sigframe32;

 typedef struct
 {
 	__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
 	__u8 retcode[S390_SYSCALL_SIZE];
 	compat_siginfo_t info;
 	struct ucontext32 uc;
 } rt_sigframe32;

 int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
 {
 	int err;

 	if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
 		return -EFAULT;

 	/* If you change siginfo_t structure, please be sure
 	   this code is fixed accordingly.
 	   It should never copy any pad contained in the structure
 	   to avoid security leaks, but must copy the generic
 	   3 ints plus the relevant union member.
 	   This routine must convert siginfo from 64bit to 32bit as well
 	   at the same time.  */
 	err = __put_user(from->si_signo, &to->si_signo);
 	err |= __put_user(from->si_errno, &to->si_errno);
 	err |= __put_user((short)from->si_code, &to->si_code);
 	if (from->si_code < 0)
 		err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
 	else {
 		switch (from->si_code >> 16) {
 		case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
 		case __SI_MESGQ >> 16:
 			err |= __put_user(from->si_int, &to->si_int);
 			/* fallthrough */
 		case __SI_KILL >> 16:
 			err |= __put_user(from->si_pid, &to->si_pid);
 			err |= __put_user(from->si_uid, &to->si_uid);
 			break;
 		case __SI_CHLD >> 16:
 			err |= __put_user(from->si_pid, &to->si_pid);
 			err |= __put_user(from->si_uid, &to->si_uid);
 			err |= __put_user(from->si_utime, &to->si_utime);
 			err |= __put_user(from->si_stime, &to->si_stime);
 			err |= __put_user(from->si_status, &to->si_status);
 			break;
 		case __SI_FAULT >> 16:
 			err |= __put_user((unsigned long) from->si_addr,
 					  &to->si_addr);
 			break;
 		case __SI_POLL >> 16:
 			err |= __put_user(from->si_band, &to->si_band);
 			err |= __put_user(from->si_fd, &to->si_fd);
 			break;
 		case __SI_TIMER >> 16:
 			err |= __put_user(from->si_tid, &to->si_tid);
 			err |= __put_user(from->si_overrun, &to->si_overrun);
 			err |= __put_user(from->si_int, &to->si_int);
 			break;
 		default:
 			break;
 		}
 	}
 	return err;
 }

 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
 {
 	int err;
 	u32 tmp;

 	if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
 		return -EFAULT;

 	err = __get_user(to->si_signo, &from->si_signo);
 	err |= __get_user(to->si_errno, &from->si_errno);
 	err |= __get_user(to->si_code, &from->si_code);

 	if (to->si_code < 0)
 		err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
 	else {
 		switch (to->si_code >> 16) {
 		case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
 		case __SI_MESGQ >> 16:
 			err |= __get_user(to->si_int, &from->si_int);
 			/* fallthrough */
 		case __SI_KILL >> 16:
 			err |= __get_user(to->si_pid, &from->si_pid);
 			err |= __get_user(to->si_uid, &from->si_uid);
 			break;
 		case __SI_CHLD >> 16:
 			err |= __get_user(to->si_pid, &from->si_pid);
 			err |= __get_user(to->si_uid, &from->si_uid);
 			err |= __get_user(to->si_utime, &from->si_utime);
 			err |= __get_user(to->si_stime, &from->si_stime);
 			err |= __get_user(to->si_status, &from->si_status);
 			break;
 		case __SI_FAULT >> 16:
 			err |= __get_user(tmp, &from->si_addr);
 			to->si_addr = (void __user *)(u64) (tmp & PSW32_ADDR_INSN);
 			break;
 		case __SI_POLL >> 16:
 			err |= __get_user(to->si_band, &from->si_band);
 			err |= __get_user(to->si_fd, &from->si_fd);
 			break;
 		case __SI_TIMER >> 16:
 			err |= __get_user(to->si_tid, &from->si_tid);
 			err |= __get_user(to->si_overrun, &from->si_overrun);
 			err |= __get_user(to->si_int, &from->si_int);
 			break;
 		default:
 			break;
 		}
 	}
 	return err;
 }

 asmlinkage long
 sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
 		 struct old_sigaction32 __user *oact)
 {
         struct k_sigaction new_ka, old_ka;
 	unsigned long sa_handler, sa_restorer;
         int ret;

         if (act) {
 		compat_old_sigset_t mask;
 		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 		    __get_user(sa_handler, &act->sa_handler) ||
 		    __get_user(sa_restorer, &act->sa_restorer) ||
 		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
 		    __get_user(mask, &act->sa_mask))
 			return -EFAULT;
 		new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
 		new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer;
 		siginitset(&new_ka.sa.sa_mask, mask);
         }

         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

 	if (!ret && oact) {
 		sa_handler = (unsigned long) old_ka.sa.sa_handler;
 		sa_restorer = (unsigned long) old_ka.sa.sa_restorer;
 		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 		    __put_user(sa_handler, &oact->sa_handler) ||
 		    __put_user(sa_restorer, &oact->sa_restorer) ||
 		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
 		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
 			return -EFAULT;
         }

 	return ret;
 }

 asmlinkage long
 sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
 	   struct sigaction32 __user *oact,  size_t sigsetsize)
 {
 	struct k_sigaction new_ka, old_ka;
 	unsigned long sa_handler;
 	int ret;
 	compat_sigset_t set32;

 	/* XXX: Don't preclude handling different sized sigset_t's.  */
 	if (sigsetsize != sizeof(compat_sigset_t))
 		return -EINVAL;

 	if (act) {
 		ret = get_user(sa_handler, &act->sa_handler);
 		ret |= __copy_from_user(&set32, &act->sa_mask,
 					sizeof(compat_sigset_t));
 		switch (_NSIG_WORDS) {
 		case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
 				| (((long)set32.sig[7]) << 32);
 		case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
 				| (((long)set32.sig[5]) << 32);
 		case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
 				| (((long)set32.sig[3]) << 32);
 		case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
 				| (((long)set32.sig[1]) << 32);
 		}
 		ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);

 		if (ret)
 			return -EFAULT;
 		new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
 	}

 	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

 	if (!ret && oact) {
 		switch (_NSIG_WORDS) {
 		case 4:
 			set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
 			set32.sig[6] = old_ka.sa.sa_mask.sig[3];
 		case 3:
 			set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
 			set32.sig[4] = old_ka.sa.sa_mask.sig[2];
 		case 2:
 			set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
 			set32.sig[2] = old_ka.sa.sa_mask.sig[1];
 		case 1:
 			set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
 			set32.sig[0] = old_ka.sa.sa_mask.sig[0];
 		}
 		ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
 		ret |= __copy_to_user(&oact->sa_mask, &set32,
 				      sizeof(compat_sigset_t));
 		ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 	}

 	return ret;
 }

 asmlinkage long
 sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss,
 							struct pt_regs *regs)
 {
 	stack_t kss, koss;
 	unsigned long ss_sp;
 	int ret, err = 0;
 	mm_segment_t old_fs = get_fs();

 	if (uss) {
 		if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
 			return -EFAULT;
 		err |= __get_user(ss_sp, &uss->ss_sp);
 		err |= __get_user(kss.ss_size, &uss->ss_size);
 		err |= __get_user(kss.ss_flags, &uss->ss_flags);
 		if (err)
 			return -EFAULT;
 		kss.ss_sp = (void __user *) ss_sp;
 	}

 	set_fs (KERNEL_DS);
 	ret = do_sigaltstack((stack_t __force __user *) (uss ? &kss : NULL),
 			     (stack_t __force __user *) (uoss ? &koss : NULL),
 			     regs->gprs[15]);
 	set_fs (old_fs);

 	if (!ret && uoss) {
 		if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
 			return -EFAULT;
 		ss_sp = (unsigned long) koss.ss_sp;
 		err |= __put_user(ss_sp, &uoss->ss_sp);
 		err |= __put_user(koss.ss_size, &uoss->ss_size);
 		err |= __put_user(koss.ss_flags, &uoss->ss_flags);
 		if (err)
 			return -EFAULT;
 	}
 	return ret;
 }

 static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
 {
 	_s390_regs_common32 regs32;
 	int err, i;

 	regs32.psw.mask = PSW32_MASK_MERGE(psw32_user_bits,
 					   (__u32)(regs->psw.mask >> 32));
 	regs32.psw.addr = PSW32_ADDR_AMODE31 | (__u32) regs->psw.addr;
 	for (i = 0; i < NUM_GPRS; i++)
 		regs32.gprs[i] = (__u32) regs->gprs[i];
 	save_access_regs(current->thread.acrs);
 	memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs));
 	err = __copy_to_user(&sregs->regs, &regs32, sizeof(regs32));
 	if (err)
 		return err;
 	save_fp_regs(&current->thread.fp_regs);
 	/* s390_fp_regs and _s390_fp_regs32 are the same ! */
 	return __copy_to_user(&sregs->fpregs, &current->thread.fp_regs,
 			      sizeof(_s390_fp_regs32));
 }

 static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
 {
 	_s390_regs_common32 regs32;
 	int err, i;

 	/* Alwys make any pending restarted system call return -EINTR */
 	current_thread_info()->restart_block.fn = do_no_restart_syscall;

 	err = __copy_from_user(&regs32, &sregs->regs, sizeof(regs32));
 	if (err)
 		return err;
 	regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask,
 				        (__u64)regs32.psw.mask << 32);
 	regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
 	for (i = 0; i < NUM_GPRS; i++)
 		regs->gprs[i] = (__u64) regs32.gprs[i];
 	memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs));
 	restore_access_regs(current->thread.acrs);

 	err = __copy_from_user(&current->thread.fp_regs, &sregs->fpregs,
 			       sizeof(_s390_fp_regs32));
 	current->thread.fp_regs.fpc &= FPC_VALID_MASK;
 	if (err)
 		return err;

 	restore_fp_regs(&current->thread.fp_regs);
 	regs->trap = -1;	/* disable syscall checks */
 	return 0;
 }

 asmlinkage long sys32_sigreturn(struct pt_regs *regs)
 {
 	sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
 	sigset_t set;

 	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
 		goto badframe;
 	if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
 		goto badframe;

 	sigdelsetmask(&set, ~_BLOCKABLE);
 	spin_lock_irq(&current->sighand->siglock);
 	current->blocked = set;
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);

 	if (restore_sigregs32(regs, &frame->sregs))
 		goto badframe;

 	return regs->gprs[2];

 badframe:
 	force_sig(SIGSEGV, current);
 	return 0;
 }

 asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
 {
 	rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
 	sigset_t set;
 	stack_t st;
 	__u32 ss_sp;
 	int err;
 	mm_segment_t old_fs = get_fs();

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

 	sigdelsetmask(&set, ~_BLOCKABLE);
 	spin_lock_irq(&current->sighand->siglock);
 	current->blocked = set;
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);

 	if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
 		goto badframe;

 	err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
 	st.ss_sp = compat_ptr(ss_sp);
 	err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
 	err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
 	if (err)
 		goto badframe;

 	set_fs (KERNEL_DS);
 	do_sigaltstack((stack_t __force __user *)&st, NULL, regs->gprs[15]);
 	set_fs (old_fs);

 	return regs->gprs[2];

 badframe:
         force_sig(SIGSEGV, current);
         return 0;
 }

 /*
  * Set up a signal frame.
  */


 /*
  * Determine which stack to use..
  */
 static inline void __user *
 get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
 {
 	unsigned long sp;

 	/* Default to using normal stack */
 	sp = (unsigned long) A(regs->gprs[15]);

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

 	/* This is the legacy signal stack switching. */
 	else if (!user_mode(regs) &&
 		 !(ka->sa.sa_flags & SA_RESTORER) &&
 		 ka->sa.sa_restorer) {
 		sp = (unsigned long) ka->sa.sa_restorer;
 	}

 	return (void __user *)((sp - frame_size) & -8ul);
 }

 static inline int map_signal(int sig)
 {
 	if (current_thread_info()->exec_domain
 	    && current_thread_info()->exec_domain->signal_invmap
 	    && sig < 32)
 		return current_thread_info()->exec_domain->signal_invmap[sig];
         else
 		return sig;
 }

 static int setup_frame32(int sig, struct k_sigaction *ka,
 			sigset_t *set, struct pt_regs * regs)
 {
 	sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32));
 	if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
 		goto give_sigsegv;

 	if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
 		goto give_sigsegv;

 	if (save_sigregs32(regs, &frame->sregs))
 		goto give_sigsegv;
 	if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
 		goto give_sigsegv;

 	/* Set up to return from userspace.  If provided, use a stub
 	   already in userspace.  */
 	if (ka->sa.sa_flags & SA_RESTORER) {
 		regs->gprs[14] = (__u64) ka->sa.sa_restorer;
 	} else {
 		regs->gprs[14] = (__u64) frame->retcode;
 		if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
 		               (u16 __user *)(frame->retcode)))
 			goto give_sigsegv;
         }

 	/* Set up backchain. */
 	if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
 		goto give_sigsegv;

 	/* Set up registers for signal handler */
 	regs->gprs[15] = (__u64) frame;
 	regs->psw.addr = (__u64) ka->sa.sa_handler;

 	regs->gprs[2] = map_signal(sig);
 	regs->gprs[3] = (__u64) &frame->sc;

 	/* We forgot to include these in the sigcontext.
 	   To avoid breaking binary compatibility, they are passed as args. */
 	regs->gprs[4] = current->thread.trap_no;
 	regs->gprs[5] = current->thread.prot_addr;

 	/* Place signal number on stack to allow backtrace from handler.  */
 	if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
 		goto give_sigsegv;
 	return 0;

 give_sigsegv:
 	force_sigsegv(sig, current);
 	return -EFAULT;
 }

 static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
 			   sigset_t *set, struct pt_regs * regs)
 {
 	int err = 0;
 	rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32));
 	if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
 		goto give_sigsegv;

 	if (copy_siginfo_to_user32(&frame->info, info))
 		goto give_sigsegv;

 	/* Create the ucontext.  */
 	err |= __put_user(0, &frame->uc.uc_flags);
 	err |= __put_user(0, &frame->uc.uc_link);
 	err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
 	err |= __put_user(sas_ss_flags(regs->gprs[15]),
 	                  &frame->uc.uc_stack.ss_flags);
 	err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
 	err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
 	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 	if (err)
 		goto give_sigsegv;

 	/* Set up to return from userspace.  If provided, use a stub
 	   already in userspace.  */
 	if (ka->sa.sa_flags & SA_RESTORER) {
 		regs->gprs[14] = (__u64) ka->sa.sa_restorer;
 	} else {
 		regs->gprs[14] = (__u64) frame->retcode;
 		err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
 		                  (u16 __user *)(frame->retcode));
 	}

 	/* Set up backchain. */
 	if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
 		goto give_sigsegv;

 	/* Set up registers for signal handler */
 	regs->gprs[15] = (__u64) frame;
 	regs->psw.addr = (__u64) ka->sa.sa_handler;

 	regs->gprs[2] = map_signal(sig);
 	regs->gprs[3] = (__u64) &frame->info;
 	regs->gprs[4] = (__u64) &frame->uc;
 	return 0;

 give_sigsegv:
 	force_sigsegv(sig, current);
 	return -EFAULT;
 }

 /*
  * OK, we're invoking a handler
  */

 int
 handle_signal32(unsigned long sig, struct k_sigaction *ka,
 		siginfo_t *info, sigset_t *oldset, struct pt_regs * regs)
 {
 	int ret;

 	/* Set up the stack frame */
 	if (ka->sa.sa_flags & SA_SIGINFO)
 		ret = setup_rt_frame32(sig, ka, info, oldset, regs);
 	else
 		ret = setup_frame32(sig, ka, oldset, regs);

 	if (ret == 0) {
 		spin_lock_irq(&current->sighand->siglock);
 		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 		if (!(ka->sa.sa_flags & SA_NODEFER))
 			sigaddset(&current->blocked,sig);
 		recalc_sigpending();
 		spin_unlock_irq(&current->sighand->siglock);
 	}
 	return ret;
 }
	/*
	* arch/s390/kernel/compat_signal.c
	*
	* Copyright (C) IBM Corp. 2000,2006
	* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
	* Gerhard Tonn (ton@de.ibm.com)
	*
	* Copyright (C) 1991, 1992 Linus Torvalds
	*
	* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
	*/

	#include <linux/compat.h>
	#include <linux/sched.h>
	#include <linux/mm.h>
	#include <linux/smp.h>
	#include <linux/smp_lock.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/stddef.h>
	#include <linux/tty.h>
	#include <linux/personality.h>
	#include <linux/binfmts.h>
	#include <asm/ucontext.h>
	#include <asm/uaccess.h>
	#include <asm/lowcore.h>
	#include "compat_linux.h"
	#include "compat_ptrace.h"

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

	typedef struct
	{
	__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
	struct sigcontext32 sc;
	_sigregs32 sregs;
	int signo;
	__u8 retcode[S390_SYSCALL_SIZE];
	} sigframe32;

	typedef struct
	{
	__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
	__u8 retcode[S390_SYSCALL_SIZE];
	compat_siginfo_t info;
	struct ucontext32 uc;
	} rt_sigframe32;

	int copy_siginfo_to_user32(compat_siginfo_t __user to, siginfo_t from)
	{
	int err;

	if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
	return -EFAULT;

	/* If you change siginfo_t structure, please be sure
	this code is fixed accordingly.
	It should never copy any pad contained in the structure
	to avoid security leaks, but must copy the generic
	3 ints plus the relevant union member.
	This routine must convert siginfo from 64bit to 32bit as well
	at the same time. */
	err = __put_user(from->si_signo, &to->si_signo);
	err \|= __put_user(from->si_errno, &to->si_errno);
	err \|= __put_user((short)from->si_code, &to->si_code);
	if (from->si_code < 0)
	err \|= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
	else {
	switch (from->si_code >> 16) {
	case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
	case __SI_MESGQ >> 16:
	err \|= __put_user(from->si_int, &to->si_int);
	/* fallthrough */
	case __SI_KILL >> 16:
	err \|= __put_user(from->si_pid, &to->si_pid);
	err \|= __put_user(from->si_uid, &to->si_uid);
	break;
	case __SI_CHLD >> 16:
	err \|= __put_user(from->si_pid, &to->si_pid);
	err \|= __put_user(from->si_uid, &to->si_uid);
	err \|= __put_user(from->si_utime, &to->si_utime);
	err \|= __put_user(from->si_stime, &to->si_stime);
	err \|= __put_user(from->si_status, &to->si_status);
	break;
	case __SI_FAULT >> 16:
	err \|= __put_user((unsigned long) from->si_addr,
	&to->si_addr);
	break;
	case __SI_POLL >> 16:
	err \|= __put_user(from->si_band, &to->si_band);
	err \|= __put_user(from->si_fd, &to->si_fd);
	break;
	case __SI_TIMER >> 16:
	err \|= __put_user(from->si_tid, &to->si_tid);
	err \|= __put_user(from->si_overrun, &to->si_overrun);
	err \|= __put_user(from->si_int, &to->si_int);
	break;
	default:
	break;
	}
	}
	return err;
	}

	int copy_siginfo_from_user32(siginfo_t to, compat_siginfo_t __user from)
	{
	int err;
	u32 tmp;

	if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
	return -EFAULT;

	err = __get_user(to->si_signo, &from->si_signo);
	err \|= __get_user(to->si_errno, &from->si_errno);
	err \|= __get_user(to->si_code, &from->si_code);

	if (to->si_code < 0)
	err \|= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
	else {
	switch (to->si_code >> 16) {
	case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
	case __SI_MESGQ >> 16:
	err \|= __get_user(to->si_int, &from->si_int);
	/* fallthrough */
	case __SI_KILL >> 16:
	err \|= __get_user(to->si_pid, &from->si_pid);
	err \|= __get_user(to->si_uid, &from->si_uid);
	break;
	case __SI_CHLD >> 16:
	err \|= __get_user(to->si_pid, &from->si_pid);
	err \|= __get_user(to->si_uid, &from->si_uid);
	err \|= __get_user(to->si_utime, &from->si_utime);
	err \|= __get_user(to->si_stime, &from->si_stime);
	err \|= __get_user(to->si_status, &from->si_status);
	break;
	case __SI_FAULT >> 16:
	err \|= __get_user(tmp, &from->si_addr);
	to->si_addr = (void __user *)(u64) (tmp & PSW32_ADDR_INSN);
	break;
	case __SI_POLL >> 16:
	err \|= __get_user(to->si_band, &from->si_band);
	err \|= __get_user(to->si_fd, &from->si_fd);
	break;
	case __SI_TIMER >> 16:
	err \|= __get_user(to->si_tid, &from->si_tid);
	err \|= __get_user(to->si_overrun, &from->si_overrun);
	err \|= __get_user(to->si_int, &from->si_int);
	break;
	default:
	break;
	}
	}
	return err;
	}

	asmlinkage long
	sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
	struct old_sigaction32 __user *oact)
	{
	struct k_sigaction new_ka, old_ka;
	unsigned long sa_handler, sa_restorer;
	int ret;

	if (act) {
	compat_old_sigset_t mask;
	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
	__get_user(sa_handler, &act->sa_handler) \|\|
	__get_user(sa_restorer, &act->sa_restorer) \|\|
	__get_user(new_ka.sa.sa_flags, &act->sa_flags) \|\|
	__get_user(mask, &act->sa_mask))
	return -EFAULT;
	new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
	new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer;
	siginitset(&new_ka.sa.sa_mask, mask);
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
	sa_handler = (unsigned long) old_ka.sa.sa_handler;
	sa_restorer = (unsigned long) old_ka.sa.sa_restorer;
	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	__put_user(sa_handler, &oact->sa_handler) \|\|
	__put_user(sa_restorer, &oact->sa_restorer) \|\|
	__put_user(old_ka.sa.sa_flags, &oact->sa_flags) \|\|
	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
	return -EFAULT;
	}

	return ret;
	}

	asmlinkage long
	sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
	struct sigaction32 __user *oact, size_t sigsetsize)
	{
	struct k_sigaction new_ka, old_ka;
	unsigned long sa_handler;
	int ret;
	compat_sigset_t set32;

	/* XXX: Don't preclude handling different sized sigset_t's. */
	if (sigsetsize != sizeof(compat_sigset_t))
	return -EINVAL;

	if (act) {
	ret = get_user(sa_handler, &act->sa_handler);
	ret \|= __copy_from_user(&set32, &act->sa_mask,
	sizeof(compat_sigset_t));
	switch (_NSIG_WORDS) {
	case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
	\| (((long)set32.sig[7]) << 32);
	case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
	\| (((long)set32.sig[5]) << 32);
	case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
	\| (((long)set32.sig[3]) << 32);
	case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
	\| (((long)set32.sig[1]) << 32);
	}
	ret \|= __get_user(new_ka.sa.sa_flags, &act->sa_flags);

	if (ret)
	return -EFAULT;
	new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
	switch (_NSIG_WORDS) {
	case 4:
	set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
	set32.sig[6] = old_ka.sa.sa_mask.sig[3];
	case 3:
	set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
	set32.sig[4] = old_ka.sa.sa_mask.sig[2];
	case 2:
	set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
	set32.sig[2] = old_ka.sa.sa_mask.sig[1];
	case 1:
	set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
	set32.sig[0] = old_ka.sa.sa_mask.sig[0];
	}
	ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
	ret \|= __copy_to_user(&oact->sa_mask, &set32,
	sizeof(compat_sigset_t));
	ret \|= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	}

	return ret;
	}

	asmlinkage long
	sys32_sigaltstack(const stack_t32 __user uss, stack_t32 __user uoss,
	struct pt_regs *regs)
	{
	stack_t kss, koss;
	unsigned long ss_sp;
	int ret, err = 0;
	mm_segment_t old_fs = get_fs();

	if (uss) {
	if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
	return -EFAULT;
	err \|= __get_user(ss_sp, &uss->ss_sp);
	err \|= __get_user(kss.ss_size, &uss->ss_size);
	err \|= __get_user(kss.ss_flags, &uss->ss_flags);
	if (err)
	return -EFAULT;
	kss.ss_sp = (void __user *) ss_sp;
	}

	set_fs (KERNEL_DS);
	ret = do_sigaltstack((stack_t __force __user *) (uss ? &kss : NULL),
	(stack_t __force __user *) (uoss ? &koss : NULL),
	regs->gprs[15]);
	set_fs (old_fs);

	if (!ret && uoss) {
	if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
	return -EFAULT;
	ss_sp = (unsigned long) koss.ss_sp;
	err \|= __put_user(ss_sp, &uoss->ss_sp);
	err \|= __put_user(koss.ss_size, &uoss->ss_size);
	err \|= __put_user(koss.ss_flags, &uoss->ss_flags);
	if (err)
	return -EFAULT;
	}
	return ret;
	}

	static int save_sigregs32(struct pt_regs regs, _sigregs32 __user sregs)
	{
	_s390_regs_common32 regs32;
	int err, i;

	regs32.psw.mask = PSW32_MASK_MERGE(psw32_user_bits,
	(__u32)(regs->psw.mask >> 32));
	regs32.psw.addr = PSW32_ADDR_AMODE31 \| (__u32) regs->psw.addr;
	for (i = 0; i < NUM_GPRS; i++)
	regs32.gprs[i] = (__u32) regs->gprs[i];
	save_access_regs(current->thread.acrs);
	memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs));
	err = __copy_to_user(&sregs->regs, &regs32, sizeof(regs32));
	if (err)
	return err;
	save_fp_regs(&current->thread.fp_regs);
	/* s390_fp_regs and _s390_fp_regs32 are the same ! */
	return __copy_to_user(&sregs->fpregs, &current->thread.fp_regs,
	sizeof(_s390_fp_regs32));
	}

	static int restore_sigregs32(struct pt_regs regs,_sigregs32 __user sregs)
	{
	_s390_regs_common32 regs32;
	int err, i;

	/* Alwys make any pending restarted system call return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

	err = __copy_from_user(&regs32, &sregs->regs, sizeof(regs32));
	if (err)
	return err;
	regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask,
	(__u64)regs32.psw.mask << 32);
	regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
	for (i = 0; i < NUM_GPRS; i++)
	regs->gprs[i] = (__u64) regs32.gprs[i];
	memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs));
	restore_access_regs(current->thread.acrs);

	err = __copy_from_user(&current->thread.fp_regs, &sregs->fpregs,
	sizeof(_s390_fp_regs32));
	current->thread.fp_regs.fpc &= FPC_VALID_MASK;
	if (err)
	return err;

	restore_fp_regs(&current->thread.fp_regs);
	regs->trap = -1; /* disable syscall checks */
	return 0;
	}

	asmlinkage long sys32_sigreturn(struct pt_regs *regs)
	{
	sigframe32 __user frame = (sigframe32 __user )regs->gprs[15];
	sigset_t set;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	goto badframe;
	if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
	goto badframe;

	sigdelsetmask(&set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	if (restore_sigregs32(regs, &frame->sregs))
	goto badframe;

	return regs->gprs[2];

	badframe:
	force_sig(SIGSEGV, current);
	return 0;
	}

	asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
	{
	rt_sigframe32 __user frame = (rt_sigframe32 __user )regs->gprs[15];
	sigset_t set;
	stack_t st;
	__u32 ss_sp;
	int err;
	mm_segment_t old_fs = get_fs();

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

	sigdelsetmask(&set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
	goto badframe;

	err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
	st.ss_sp = compat_ptr(ss_sp);
	err \|= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
	err \|= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
	if (err)
	goto badframe;

	set_fs (KERNEL_DS);
	do_sigaltstack((stack_t __force __user *)&st, NULL, regs->gprs[15]);
	set_fs (old_fs);

	return regs->gprs[2];

	badframe:
	force_sig(SIGSEGV, current);
	return 0;
	}

	/*
	* Set up a signal frame.
	*/


	/*
	* Determine which stack to use..
	*/
	static inline void __user *
	get_sigframe(struct k_sigaction ka, struct pt_regs regs, size_t frame_size)
	{
	unsigned long sp;

	/* Default to using normal stack */
	sp = (unsigned long) A(regs->gprs[15]);

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

	/* This is the legacy signal stack switching. */
	else if (!user_mode(regs) &&
	!(ka->sa.sa_flags & SA_RESTORER) &&
	ka->sa.sa_restorer) {
	sp = (unsigned long) ka->sa.sa_restorer;
	}

	return (void __user *)((sp - frame_size) & -8ul);
	}

	static inline int map_signal(int sig)
	{
	if (current_thread_info()->exec_domain
	&& current_thread_info()->exec_domain->signal_invmap
	&& sig < 32)
	return current_thread_info()->exec_domain->signal_invmap[sig];
	else
	return sig;
	}

	static int setup_frame32(int sig, struct k_sigaction *ka,
	sigset_t set, struct pt_regs regs)
	{
	sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32));
	if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
	goto give_sigsegv;

	if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
	goto give_sigsegv;

	if (save_sigregs32(regs, &frame->sregs))
	goto give_sigsegv;
	if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
	goto give_sigsegv;

	/* Set up to return from userspace. If provided, use a stub
	already in userspace. */
	if (ka->sa.sa_flags & SA_RESTORER) {
	regs->gprs[14] = (__u64) ka->sa.sa_restorer;
	} else {
	regs->gprs[14] = (__u64) frame->retcode;
	if (__put_user(S390_SYSCALL_OPCODE \| __NR_sigreturn,
	(u16 __user *)(frame->retcode)))
	goto give_sigsegv;
	}

	/* Set up backchain. */
	if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
	goto give_sigsegv;

	/* Set up registers for signal handler */
	regs->gprs[15] = (__u64) frame;
	regs->psw.addr = (__u64) ka->sa.sa_handler;

	regs->gprs[2] = map_signal(sig);
	regs->gprs[3] = (__u64) &frame->sc;

	/* We forgot to include these in the sigcontext.
	To avoid breaking binary compatibility, they are passed as args. */
	regs->gprs[4] = current->thread.trap_no;
	regs->gprs[5] = current->thread.prot_addr;

	/* Place signal number on stack to allow backtrace from handler. */
	if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
	goto give_sigsegv;
	return 0;

	give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;
	}

	static int setup_rt_frame32(int sig, struct k_sigaction ka, siginfo_t info,
	sigset_t set, struct pt_regs regs)
	{
	int err = 0;
	rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32));
	if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
	goto give_sigsegv;

	if (copy_siginfo_to_user32(&frame->info, info))
	goto give_sigsegv;

	/* Create the ucontext. */
	err \|= __put_user(0, &frame->uc.uc_flags);
	err \|= __put_user(0, &frame->uc.uc_link);
	err \|= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
	err \|= __put_user(sas_ss_flags(regs->gprs[15]),
	&frame->uc.uc_stack.ss_flags);
	err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	err \|= save_sigregs32(regs, &frame->uc.uc_mcontext);
	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	if (err)
	goto give_sigsegv;

	/* Set up to return from userspace. If provided, use a stub
	already in userspace. */
	if (ka->sa.sa_flags & SA_RESTORER) {
	regs->gprs[14] = (__u64) ka->sa.sa_restorer;
	} else {
	regs->gprs[14] = (__u64) frame->retcode;
	err \|= __put_user(S390_SYSCALL_OPCODE \| __NR_rt_sigreturn,
	(u16 __user *)(frame->retcode));
	}

	/* Set up backchain. */
	if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
	goto give_sigsegv;

	/* Set up registers for signal handler */
	regs->gprs[15] = (__u64) frame;
	regs->psw.addr = (__u64) ka->sa.sa_handler;

	regs->gprs[2] = map_signal(sig);
	regs->gprs[3] = (__u64) &frame->info;
	regs->gprs[4] = (__u64) &frame->uc;
	return 0;

	give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;
	}

	/*
	* OK, we're invoking a handler
	*/

	int
	handle_signal32(unsigned long sig, struct k_sigaction *ka,
	siginfo_t info, sigset_t oldset, struct pt_regs * regs)
	{
	int ret;

	/* Set up the stack frame */
	if (ka->sa.sa_flags & SA_SIGINFO)
	ret = setup_rt_frame32(sig, ka, info, oldset, regs);
	else
	ret = setup_frame32(sig, ka, oldset, regs);

	if (ret == 0) {
	spin_lock_irq(&current->sighand->siglock);
	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	if (!(ka->sa.sa_flags & SA_NODEFER))
	sigaddset(&current->blocked,sig);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);
	}
	return ret;
	}