NetBSD-5.0.2/sys/arch/mips/mips/compat_16_machdep.c
/* $NetBSD: compat_16_machdep.c,v 1.12 2008/04/28 20:23:28 martin Exp $ */
/*-
* Copyright (c) 1998, 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center and by Chris Demetriou.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 THE FOUNDATION OR CONTRIBUTORS
* 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.
*/
/*
* Copyright 1996 The Board of Trustees of The Leland Stanford
* Junior University. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies. Stanford University
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
*/
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.12 2008/04/28 20:23:28 martin Exp $");
#include "opt_cputype.h"
#include "opt_compat_netbsd.h"
#include "opt_compat_ultrix.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#include <compat/sys/signal.h>
#include <compat/sys/signalvar.h>
#include <machine/cpu.h>
#include <mips/regnum.h>
#include <mips/frame.h>
#ifdef DEBUG
int sigdebug = 0;
int sigpid = 0;
#define SDB_FOLLOW 0x01
#define SDB_KSTACK 0x02
#define SDB_FPSTATE 0x04
#endif
/*
* Send a signal to process.
*/
void
sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *returnmask)
{
int sig = ksi->ksi_signo;
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
struct sigacts *ps = p->p_sigacts;
int onstack, error;
struct sigcontext *scp = getframe(l, sig, &onstack), ksc;
struct frame *f;
sig_t catcher = SIGACTION(p, sig).sa_handler;
f = (struct frame *)l->l_md.md_regs;
scp--;
#ifdef DEBUG
if ((sigdebug & SDB_FOLLOW) ||
((sigdebug & SDB_KSTACK) && p->p_pid == sigpid))
printf("sendsig(%d): sig %d ssp %p scp %p\n",
p->p_pid, sig, &onstack, scp);
#endif
/* Build stack frame for signal trampoline. */
ksc.sc_pc = f->f_regs[_R_PC];
ksc.mullo = f->f_regs[_R_MULLO];
ksc.mulhi = f->f_regs[_R_MULHI];
/* Save register context. */
ksc.sc_regs[_R_ZERO] = 0xACEDBADE; /* magic number */
memcpy(&ksc.sc_regs[1], &f->f_regs[1],
sizeof(ksc.sc_regs) - sizeof(ksc.sc_regs[0]));
/* Save the FP state, if necessary, then copy it. */
#ifndef SOFTFLOAT
ksc.sc_fpused = l->l_md.md_flags & MDP_FPUSED;
if (ksc.sc_fpused) {
/* if FPU has current state, save it first */
if (l == fpcurlwp)
savefpregs(l);
*(struct fpreg *)ksc.sc_fpregs = l->l_addr->u_pcb.pcb_fpregs;
}
#else
*(struct fpreg *)ksc.sc_fpregs = l->l_addr->u_pcb.pcb_fpregs;
#endif
/* Save signal stack. */
ksc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK;
/* Save signal mask. */
ksc.sc_mask = *returnmask;
#if defined(COMPAT_13) || defined(COMPAT_ULTRIX)
/*
* 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(returnmask, &ksc.__sc_mask13);
#endif
sendsig_reset(l, sig);
mutex_exit(p->p_lock);
error = copyout(&ksc, (void *)scp, sizeof(ksc));
mutex_enter(p->p_lock);
if (error != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
#ifdef DEBUG
if ((sigdebug & SDB_FOLLOW) ||
((sigdebug & SDB_KSTACK) && p->p_pid == sigpid))
printf("sendsig(%d): copyout failed on sig %d\n",
p->p_pid, sig);
#endif
sigexit(l, SIGILL);
/* NOTREACHED */
}
/*
* Set up the registers to directly invoke the signal
* handler. The return address will be set up to point
* to the signal trampoline to bounce us back.
*/
f->f_regs[_R_A0] = sig;
f->f_regs[_R_A1] = ksi->ksi_trap;
f->f_regs[_R_A2] = (intptr_t)scp;
f->f_regs[_R_A3] = (intptr_t)catcher; /* XXX ??? */
f->f_regs[_R_PC] = (intptr_t)catcher;
f->f_regs[_R_T9] = (intptr_t)catcher;
f->f_regs[_R_SP] = (intptr_t)scp;
switch (ps->sa_sigdesc[sig].sd_vers) {
case 0: /* legacy on-stack sigtramp */
f->f_regs[_R_RA] = (intptr_t)p->p_sigctx.ps_sigcode;
break;
#ifdef COMPAT_16
case 1:
f->f_regs[_R_RA] = (intptr_t)ps->sa_sigdesc[sig].sd_tramp;
break;
#endif
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;
#ifdef DEBUG
if ((sigdebug & SDB_FOLLOW) ||
((sigdebug & SDB_KSTACK) && p->p_pid == sigpid))
printf("sendsig(%d): sig %d returns\n",
p->p_pid, sig);
#endif
}
#ifdef COMPAT_16 /* not needed if COMPAT_ULTRIX only */
/*
* System call to cleanup state after a signal
* has been taken. Reset signal mask and
* stack state from context left by sendsig (above).
* Return to previous pc and psl as specified by
* context left by sendsig. Check carefully to
* make sure that the user has not modified the
* psl to gain improper privileges or to cause
* a machine fault.
*/
/* ARGSUSED */
int
compat_16_sys___sigreturn14(struct lwp *l, const struct compat_16_sys___sigreturn14_args *uap, register_t *retval)
{
/* {
syscallarg(struct sigcontext *) sigcntxp;
} */
struct sigcontext *scp, ksc;
struct frame *f;
struct proc *p = l->l_proc;
int error;
/*
* The trampoline code hands us the context.
* It is unsafe to keep track of it ourselves, in the event that a
* program jumps out of a signal handler.
*/
scp = SCARG(uap, sigcntxp);
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW)
printf("sigreturn: pid %d, scp %p\n", l->l_proc->p_pid, scp);
#endif
if ((error = copyin(scp, &ksc, sizeof(ksc))) != 0)
return (error);
if ((u_int) ksc.sc_regs[_R_ZERO] != 0xacedbadeU)/* magic number */
return (EINVAL);
/* Restore the register context. */
f = (struct frame *)l->l_md.md_regs;
f->f_regs[_R_PC] = ksc.sc_pc;
f->f_regs[_R_MULLO] = ksc.mullo;
f->f_regs[_R_MULHI] = ksc.mulhi;
memcpy(&f->f_regs[1], &scp->sc_regs[1],
sizeof(scp->sc_regs) - sizeof(scp->sc_regs[0]));
#ifndef SOFTFLOAT
if (scp->sc_fpused) {
/* Disable the FPU to fault in FP registers. */
f->f_regs[_R_SR] &= ~MIPS_SR_COP_1_BIT;
if (l == fpcurlwp)
fpcurlwp = NULL;
l->l_addr->u_pcb.pcb_fpregs = *(struct fpreg *)scp->sc_fpregs;
}
#else
l->l_addr->u_pcb.pcb_fpregs = *(struct fpreg *)scp->sc_fpregs;
#endif
mutex_enter(p->p_lock);
/* Restore signal stack. */
if (ksc.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, &ksc.sc_mask, 0);
mutex_exit(p->p_lock);
return (EJUSTRETURN);
}
#endif /* COMPAT_16 */