NetBSD-5.0.2/sys/arch/sparc64/sparc64/compat_16_machdep.c
/* $NetBSD: compat_16_machdep.c,v 1.13 2008/04/28 20:23:37 martin Exp $ */
/*-
* Copyright (c) 1996, 1997, 1998 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.
*
* 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.13 2008/04/28 20:23:37 martin Exp $");
#include "opt_compat_netbsd.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#include <machine/signal.h>
#include <machine/frame.h>
#if defined(COMPAT_16)
#include <compat/sys/signal.h>
#include <compat/sys/signalvar.h>
#ifdef DEBUG
/* See sigdebug.h */
#include <sparc64/sparc64/sigdebug.h>
#endif
#ifdef __arch64__
#define STACK_OFFSET BIAS
#define CPOUTREG(l,v) copyout(&(v), (l), sizeof(v))
#undef CCFSZ
#define CCFSZ CC64FSZ
#else
#define STACK_OFFSET 0
#define CPOUTREG(l,v) copyout(&(v), (l), sizeof(v))
#endif
struct sigframe_sigcontext {
int sf_signo; /* signal number */
int sf_code; /* code */
#ifndef __arch64__
struct sigcontext *sf_scp; /* SunOS user addr of sigcontext */
int sf_addr; /* SunOS compat, always 0 for now */
#endif
struct sigcontext sf_sc; /* actual sigcontext */
};
/*
* Send an interrupt to process.
*/
void
sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask)
{
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
struct sigacts *ps = p->p_sigacts;
const void *addr;
struct rwindow *newsp;
#ifdef NOT_DEBUG
struct rwindow tmpwin;
#endif
int onstack, error;
int sig = ksi->ksi_signo;
struct sigframe_sigcontext *fp = getframe(l, sig, &onstack);
struct sigframe_sigcontext sf;
sig_t catcher = SIGACTION(p, sig).sa_handler;
struct trapframe64 *tf = l->l_md.md_tf;
/* Allocate an aligned sigframe */
fp = (void *)((u_long)(fp - 1) & ~0x0f);
#ifdef DEBUG
sigpid = p->p_pid;
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) {
printf("sendsig_sigcontext: %s[%d] sig %d newusp %p scp %p\n",
p->p_comm, p->p_pid, sig, fp, &fp->sf_sc);
#ifdef DDB
if (sigdebug & SDB_DDB) Debugger();
#endif
}
#endif
/*
* Now set up the signal frame. We build it in kernel space
* and then copy it out. We probably ought to just build it
* directly in user space....
*/
sf.sf_signo = sig;
sf.sf_code = ksi->ksi_trap;
#ifndef __arch64__
sf.sf_scp = 0;
sf.sf_addr = 0; /* XXX */
#endif
/*
* Build the signal context to be used by sigreturn.
*/
sf.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK;
sf.sf_sc.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, &sf.sf_sc.__sc_mask13);
#endif
/* Save register context. */
sf.sf_sc.sc_sp = (long)tf->tf_out[6];
sf.sf_sc.sc_pc = tf->tf_pc;
sf.sf_sc.sc_npc = tf->tf_npc;
#ifdef __arch64__
sf.sf_sc.sc_tstate = tf->tf_tstate; /* XXX */
#else
sf.sf_sc.sc_psr = TSTATECCR_TO_PSR(tf->tf_tstate); /* XXX */
#endif
sf.sf_sc.sc_g1 = tf->tf_global[1];
sf.sf_sc.sc_o0 = tf->tf_out[0];
/*
* Put the stack in a consistent state before we whack away
* at it. Note that write_user_windows may just dump the
* registers into the pcb; we need them in the process's memory.
* We also need to make sure that when we start the signal handler,
* its %i6 (%fp), which is loaded from the newly allocated stack area,
* joins seamlessly with the frame it was in when the signal occurred,
* so that the debugger and _longjmp code can back up through it.
*/
sendsig_reset(l, sig);
mutex_exit(p->p_lock);
newsp = (struct rwindow *)((vaddr_t)fp - sizeof(struct rwindow));
write_user_windows();
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK))
printf("sendsig: saving sf to %p, setting stack pointer %p to %p\n",
fp, &(((struct rwindow *)newsp)->rw_in[6]),
(void *)(unsigned long)tf->tf_out[6]);
#endif
error = (rwindow_save(l) || copyout((void *)&sf, (void *)fp, sizeof sf) ||
#ifdef NOT_DEBUG
copyin(oldsp, &tmpwin, sizeof(tmpwin)) || copyout(&tmpwin, newsp, sizeof(tmpwin)) ||
#endif
CPOUTREG(&(((struct rwindow *)newsp)->rw_in[6]), tf->tf_out[6]));
mutex_enter(p->p_lock);
if (error) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
#ifdef DEBUG
mutex_exit(p->p_lock);
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
printf("sendsig: window save or copyout error\n");
printf("sendsig: stack was trashed trying to send sig %d, sending SIGILL\n", sig);
#ifdef DDB
if (sigdebug & SDB_DDB) Debugger();
#endif
mutex_enter(p->p_lock);
#endif
sigexit(l, SIGILL);
/* NOTREACHED */
}
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW) {
printf("sendsig: %s[%d] sig %d scp %p\n",
p->p_comm, p->p_pid, sig, &fp->sf_sc);
}
#endif
/*
* Arrange to continue execution at the code copied out in exec().
* It needs the function to call in %g1, and a new stack pointer.
*/
switch (ps->sa_sigdesc[sig].sd_vers) {
case 0: /* legacy on-stack sigtramp */
addr = p->p_sigctx.ps_sigcode;
break;
case 1:
addr = ps->sa_sigdesc[sig].sd_tramp;
break;
default:
addr = NULL; /* XXX: gcc */
/* Don't know what trampoline version; kill it. */
sigexit(l, SIGILL);
}
tf->tf_global[1] = (vaddr_t)catcher;
tf->tf_pc = (const vaddr_t)addr;
tf->tf_npc = (const vaddr_t)addr + 4;
tf->tf_out[6] = (vaddr_t)newsp - STACK_OFFSET;
/* Remember that we're now on the signal stack. */
if (onstack)
l->l_sigstk.ss_flags |= SS_ONSTACK;
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) {
mutex_exit(p->p_lock);
printf("sendsig: about to return to catcher %p thru %p\n",
catcher, (void *)(unsigned long)addr);
#ifdef DDB
if (sigdebug & SDB_DDB) Debugger();
#endif
mutex_enter(p->p_lock);
}
#endif
}
/*
* System call to cleanup state after a signal
* has been taken. Reset signal mask and
* stack state from context left by sendsig (above),
* and return to the given trap frame (if there is one).
* Check carefully to make sure that the user has not
* modified the state to gain improper privileges or to cause
* a machine fault.
*/
int compat_16_sys___sigreturn14(struct lwp *, const struct compat_16_sys___sigreturn14_args *, register_t *);
/* 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 sc, *scp;
struct trapframe64 *tf;
int error = EINVAL;
struct proc *p = l->l_proc;
/* First ensure consistent stack state (see sendsig). */
write_user_windows();
if (rwindow_save(l)) {
#ifdef DEBUG
printf("sigreturn14: rwindow_save(%p) failed, sending SIGILL\n", p);
#ifdef DDB
if (sigdebug & SDB_DDB) Debugger();
#endif
#endif
mutex_enter(p->p_lock);
sigexit(l, SIGILL);
}
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW) {
printf("sigreturn14: %s[%d], sigcntxp %p\n",
p->p_comm, p->p_pid, SCARG(uap, sigcntxp));
#ifdef DDB
if (sigdebug & SDB_DDB) Debugger();
#endif
}
#endif
scp = SCARG(uap, sigcntxp);
if ((vaddr_t)scp & 3 || (error = copyin((void *)scp, &sc, sizeof sc) != 0))
#ifdef DEBUG
{
printf("sigreturn14: copyin failed: scp=%p\n", scp);
#ifdef DDB
if (sigdebug & SDB_DDB) Debugger();
#endif
return (error);
}
#else
return (error);
#endif
scp = ≻
tf = l->l_md.md_tf;
/*
* Only the icc bits in the psr are used, so it need not be
* verified. pc and npc must be multiples of 4. This is all
* that is required; if it holds, just do it.
*/
if (((sc.sc_pc | sc.sc_npc) & 3) != 0 || (sc.sc_pc == 0) || (sc.sc_npc == 0))
#ifdef DEBUG
{
printf("sigreturn14: pc %p or npc %p invalid\n",
(void *)(unsigned long)sc.sc_pc,
(void *)(unsigned long)sc.sc_npc);
#ifdef DDB
if (sigdebug & SDB_DDB) Debugger();
#endif
return (EINVAL);
}
#else
return (EINVAL);
#endif
/* take only psr ICC field */
#ifdef __arch64__
tf->tf_tstate = (uint64_t)(tf->tf_tstate & ~TSTATE_CCR) | (scp->sc_tstate & TSTATE_CCR);
#else
tf->tf_tstate = (uint64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr);
#endif
tf->tf_pc = (uint64_t)scp->sc_pc;
tf->tf_npc = (uint64_t)scp->sc_npc;
tf->tf_global[1] = (uint64_t)scp->sc_g1;
tf->tf_out[0] = (uint64_t)scp->sc_o0;
tf->tf_out[6] = (uint64_t)scp->sc_sp;
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW) {
printf("sigreturn14: return trapframe pc=%p sp=%p tstate=%llx\n",
(void *)(unsigned long)tf->tf_pc,
(void *)(unsigned long)tf->tf_out[6],
(unsigned long long)tf->tf_tstate);
#ifdef DDB
if (sigdebug & SDB_DDB) Debugger();
#endif
}
#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);
}
#endif /* COMPAT_16 */