NetBSD-5.0.2/sys/arch/powerpc/powerpc/compat_16_machdep.c
/* $NetBSD: compat_16_machdep.c,v 1.11 2008/04/24 18:39:21 ad Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.11 2008/04/24 18:39:21 ad Exp $");
#include "opt_compat_netbsd.h"
#include "opt_altivec.h"
#include "opt_ppcarch.h"
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/syscallargs.h>
#include <sys/systm.h>
#include <sys/ucontext.h>
#include <sys/user.h>
#include <compat/sys/signal.h>
#include <compat/sys/signalvar.h>
#include <machine/fpu.h>
/*
* Send a signal to process.
*/
void
sendsig_sigcontext(int sig, const sigset_t *mask, u_long code)
{
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
struct sigacts *ps = p->p_sigacts;
struct sigcontext *fp, frame;
struct trapframe *tf;
struct utrapframe *utf = &frame.sc_frame;
int onstack, error;
sig_t catcher = SIGACTION(p, sig).sa_handler;
tf = trapframe(l);
/* Do we need to jump onto the signal stack? */
onstack =
(l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
(SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
/* Allocate space for the signal handler context. */
if (onstack)
fp = (struct sigcontext *)((char *)l->l_sigstk.ss_sp +
l->l_sigstk.ss_size);
else
fp = (struct sigcontext *)tf->fixreg[1];
fp = (struct sigcontext *)((uintptr_t)(fp - 1) & ~0xf);
/* Save register context. */
memcpy(utf->fixreg, tf->fixreg, sizeof(utf->fixreg));
utf->lr = tf->lr;
utf->cr = tf->cr;
utf->xer = tf->xer;
utf->ctr = tf->ctr;
utf->srr0 = tf->srr0;
utf->srr1 = tf->srr1 & PSL_USERSRR1;
#ifdef PPC_HAVE_FPU
utf->srr1 |= l->l_addr->u_pcb.pcb_flags & (PCB_FE0|PCB_FE1);
#endif
#ifdef ALTIVEC
utf->srr1 |= l->l_addr->u_pcb.pcb_flags & PCB_ALTIVEC ? PSL_VEC : 0;
#endif
#ifdef PPC_OEA
utf->vrsave = tf->tf_xtra[TF_VRSAVE];
utf->mq = tf->tf_xtra[TF_MQ];
#endif
/* Save signal stack. */
frame.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK;
/* Save signal mask. */
frame.sc_mask = *mask;
#ifdef COMPAT_13
/*
* XXX We always have to save an old style signal mask because
* XXX we might be delivering a signal to a process which will
* XXX escape from the signal in a non-standard way and invoke
* XXX sigreturn() directly.
*/
native_sigset_to_sigset13(mask, &frame.__sc_mask13);
#endif
sendsig_reset(l, sig);
mutex_exit(p->p_lock);
error = copyout(&frame, fp, sizeof frame);
mutex_enter(p->p_lock);
if (error != 0) {
/*
* Process has trashed its stack; give it an illegal
* instructoin to halt it in its tracks.
*/
sigexit(l, SIGILL);
/* NOTREACHED */
}
/*
* Build context to run handler in. Note the trampoline version
* numbers are coordinated with machine-dependent code in libc.
*/
switch (ps->sa_sigdesc[sig].sd_vers) {
#if 1 /* COMPAT_16 */
case 0: /* legacy on-stack sigtramp */
tf->fixreg[1] = (register_t)fp;
tf->lr = (register_t)catcher;
tf->fixreg[3] = (register_t)sig;
tf->fixreg[4] = (register_t)code;
tf->fixreg[5] = (register_t)fp;
tf->srr0 = (register_t)p->p_sigctx.ps_sigcode;
break;
#endif /* COMPAT_16 */
case 1:
tf->fixreg[1] = (register_t)fp;
tf->lr = (register_t)catcher;
tf->fixreg[3] = (register_t)sig;
tf->fixreg[4] = (register_t)code;
tf->fixreg[5] = (register_t)fp;
tf->srr0 = (register_t)ps->sa_sigdesc[sig].sd_tramp;
break;
default:
/* Don't know what trampoline version; kill it. */
sigexit(l, SIGILL);
}
/* Remember that we're now on the signal stack. */
if (onstack)
l->l_sigstk.ss_flags |= SS_ONSTACK;
}
/*
* System call to cleanup state after a signal handler returns.
*/
int
compat_16_sys___sigreturn14(struct lwp *l, const struct compat_16_sys___sigreturn14_args *uap, register_t *retval)
{
/* {
syscallarg(struct sigcontext *) sigcntxp;
} */
struct proc *p = l->l_proc;
struct sigcontext sc;
struct trapframe *tf;
struct utrapframe * const utf = &sc.sc_frame;
int error;
/*
* The trampoline hands us the context.
* It is unsafe to keep track of it ourselves, in the event that a
* program jumps out of a signal hander.
*/
if ((error = copyin(SCARG(uap, sigcntxp), &sc, sizeof sc)) != 0)
return (error);
/* Restore the register context. */
tf = trapframe(l);
/*
* Make sure SRR1 hasn't been maliciously tampered with.
*/
if (!PSL_USEROK_P(sc.sc_frame.srr1))
return (EINVAL);
/* Restore register context. */
memcpy(tf->fixreg, utf->fixreg, sizeof(tf->fixreg));
tf->lr = utf->lr;
tf->cr = utf->cr;
tf->xer = utf->xer;
tf->ctr = utf->ctr;
tf->srr0 = utf->srr0;
tf->srr1 = utf->srr1;
#ifdef PPC_HAVE_FPU
l->l_addr->u_pcb.pcb_flags &= ~(PCB_FE0|PCB_FE1);
l->l_addr->u_pcb.pcb_flags |= utf->srr1 & (PCB_FE0|PCB_FE1);
#endif
#ifdef PPC_OEA
tf->tf_xtra[TF_VRSAVE] = utf->vrsave;
tf->tf_xtra[TF_MQ] = utf->mq;
#endif
mutex_enter(p->p_lock);
/* Restore signal stack. */
if (sc.sc_onstack & SS_ONSTACK)
l->l_sigstk.ss_flags |= SS_ONSTACK;
else
l->l_sigstk.ss_flags &= ~SS_ONSTACK;
/* Restore signal mask. */
(void) sigprocmask1(l, SIG_SETMASK, &sc.sc_mask, 0);
mutex_exit(p->p_lock);
return (EJUSTRETURN);
}