/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
/*
* 4.3BSD signal compatibility functions
*
* the implementation interprets signal masks equal to -1 as "all of the
* signals in the signal set", thereby allowing signals with numbers
* above 32 to be blocked when referenced in code such as:
*
* for (i = 0; i < NSIG; i++)
* mask |= sigmask(i)
*/
#include <sys/types.h>
#include <ucontext.h>
#include <signal.h>
#include <errno.h>
#undef BUS_OBJERR /* namespace conflict */
#include <sys/siginfo.h>
#include "libc.h"
#pragma weak sigvechandler = _sigvechandler
#pragma weak sigsetmask = _sigsetmask
#pragma weak sigblock = _sigblock
#pragma weak sigpause = usigpause
#pragma weak sigvec = _sigvec
#pragma weak sigstack = _sigstack
#pragma weak signal = usignal
#pragma weak siginterrupt = _siginterrupt
#define set2mask(setp) ((setp)->__sigbits[0])
#define mask2set(mask, setp) \
((mask) == -1 ? sigfillset(setp) : \
(sigemptyset(setp), (((setp)->__sigbits[0]) = (int)(mask))))
void (*_siguhandler[NSIG])() = { 0 };
/* forward declarations */
int ucbsigsetmask(int);
int ucbsigblock(int);
int ucbsigvec(int, struct sigvec *, struct sigvec *);
int ucbsigpause(int);
int ucbsiginterrupt(int, int);
/*
* sigvechandler is the real signal handler installed for all
* signals handled in the 4.3BSD compatibility interface - it translates
* SVR4 signal hander arguments into 4.3BSD signal handler arguments
* and then calls the real handler
*/
static void ucbsigvechandler();
void
_sigvechandler(int sig, siginfo_t *sip, ucontext_t *ucp)
{
ucbsigvechandler(sig, sip, ucp);
}
static void
ucbsigvechandler(int sig, siginfo_t *sip, ucontext_t *ucp)
{
struct sigcontext sc;
int code;
char *addr;
int i, j;
int gwinswitch = 0;
sc.sc_onstack = ((ucp->uc_stack.ss_flags & SS_ONSTACK) != 0);
sc.sc_mask = set2mask(&ucp->uc_sigmask);
#if defined(__amd64)
sc.sc_sp = (long)ucp->uc_mcontext.gregs[REG_RSP];
sc.sc_pc = (long)ucp->uc_mcontext.gregs[REG_RIP];
sc.sc_ps = (long)ucp->uc_mcontext.gregs[REG_RFL];
sc.sc_r0 = (long)ucp->uc_mcontext.gregs[REG_RAX];
sc.sc_r1 = (long)ucp->uc_mcontext.gregs[REG_RDX];
#else
sc.sc_sp = (int)ucp->uc_mcontext.gregs[UESP];
sc.sc_pc = (int)ucp->uc_mcontext.gregs[EIP];
sc.sc_ps = (int)ucp->uc_mcontext.gregs[EFL];
sc.sc_r0 = (int)ucp->uc_mcontext.gregs[EAX];
sc.sc_r1 = (int)ucp->uc_mcontext.gregs[EDX];
#endif
/*
* Translate signal codes from new to old.
* /usr/include/sys/siginfo.h contains new codes.
* /usr/ucbinclude/sys/signal.h contains old codes.
*/
code = 0;
addr = SIG_NOADDR;
if (sip != NULL && SI_FROMKERNEL(sip)) {
addr = sip->si_addr;
switch (sig) {
case SIGILL:
case SIGFPE:
code = ILL_ILLINSTR_FAULT;
break;
case SIGBUS:
switch (sip->si_code) {
case BUS_ADRALN:
code = BUS_ALIGN;
break;
case BUS_ADRERR:
code = BUS_HWERR;
break;
default: /* BUS_OBJERR */
code = FC_MAKE_ERR(sip->si_errno);
break;
}
break;
case SIGSEGV:
switch (sip->si_code) {
case SEGV_MAPERR:
code = SEGV_NOMAP;
break;
case SEGV_ACCERR:
code = SEGV_PROT;
break;
default:
code = FC_MAKE_ERR(sip->si_errno);
break;
}
break;
default:
addr = SIG_NOADDR;
break;
}
}
(*_siguhandler[sig])(sig, code, &sc, addr);
if (sc.sc_onstack)
ucp->uc_stack.ss_flags |= SS_ONSTACK;
else
ucp->uc_stack.ss_flags &= ~SS_ONSTACK;
mask2set(sc.sc_mask, &ucp->uc_sigmask);
#if defined(__amd64)
ucp->uc_mcontext.gregs[REG_RSP] = (long)sc.sc_sp;
ucp->uc_mcontext.gregs[REG_RIP] = (long)sc.sc_pc;
ucp->uc_mcontext.gregs[REG_RFL] = (long)sc.sc_ps;
ucp->uc_mcontext.gregs[REG_RAX] = (long)sc.sc_r0;
ucp->uc_mcontext.gregs[REG_RDX] = (long)sc.sc_r1;
#else
ucp->uc_mcontext.gregs[UESP] = (int)sc.sc_sp;
ucp->uc_mcontext.gregs[EIP] = (int)sc.sc_pc;
ucp->uc_mcontext.gregs[EFL] = (int)sc.sc_ps;
ucp->uc_mcontext.gregs[EAX] = (int)sc.sc_r0;
ucp->uc_mcontext.gregs[EDX] = (int)sc.sc_r1;
#endif
setcontext(ucp);
}
int
_sigsetmask(int mask)
{
return (ucbsigsetmask(mask));
}
int
ucbsigsetmask(int mask)
{
sigset_t oset;
sigset_t nset;
(void) sigprocmask(0, (sigset_t *)0, &nset);
mask2set(mask, &nset);
(void) sigprocmask(SIG_SETMASK, &nset, &oset);
return (set2mask(&oset));
}
int
_sigblock(int mask)
{
return (ucbsigblock(mask));
}
int
ucbsigblock(int mask)
{
sigset_t oset;
sigset_t nset;
(void) sigprocmask(0, (sigset_t *)0, &nset);
mask2set(mask, &nset);
(void) sigprocmask(SIG_BLOCK, &nset, &oset);
return (set2mask(&oset));
}
int
usigpause(int mask)
{
return (ucbsigpause(mask));
}
int
ucbsigpause(int mask)
{
sigset_t set, oset;
int ret;
(void) sigprocmask(0, (sigset_t *)0, &set);
oset = set;
mask2set(mask, &set);
ret = sigsuspend(&set);
(void) sigprocmask(SIG_SETMASK, &oset, (sigset_t *)0);
return (ret);
}
int
_sigvec(int sig, struct sigvec *nvec, struct sigvec *ovec)
{
return (ucbsigvec(sig, nvec, ovec));
}
int
ucbsigvec(int sig, struct sigvec *nvec, struct sigvec *ovec)
{
struct sigaction nact;
struct sigaction oact;
struct sigaction *nactp;
void (*ohandler)(), (*nhandler)();
if (sig <= 0 || sig >= NSIG) {
errno = EINVAL;
return (-1);
}
if ((intptr_t)ovec == -1 || (intptr_t)nvec == -1) {
errno = EFAULT;
return (-1);
}
ohandler = _siguhandler[sig];
if (nvec) {
_sigaction(sig, (struct sigaction *)0, &nact);
nhandler = nvec->sv_handler;
/*
* To be compatible with the behavior of SunOS 4.x:
* If the new signal handler is SIG_IGN or SIG_DFL,
* do not change the signal's entry in the handler array.
* This allows a child of vfork(2) to set signal handlers
* to SIG_IGN or SIG_DFL without affecting the parent.
*/
if (nhandler != SIG_DFL && nhandler != SIG_IGN) {
_siguhandler[sig] = nhandler;
nact.sa_handler = (void (*)())ucbsigvechandler;
} else {
nact.sa_handler = nhandler;
}
mask2set(nvec->sv_mask, &nact.sa_mask);
if (sig == SIGKILL || sig == SIGSTOP)
nact.sa_handler = SIG_DFL;
nact.sa_flags = SA_SIGINFO;
if (!(nvec->sv_flags & SV_INTERRUPT))
nact.sa_flags |= SA_RESTART;
if (nvec->sv_flags & SV_RESETHAND)
nact.sa_flags |= SA_RESETHAND;
if (nvec->sv_flags & SV_ONSTACK)
nact.sa_flags |= SA_ONSTACK;
nactp = &nact;
} else
nactp = (struct sigaction *)0;
if (_sigaction(sig, nactp, &oact) < 0) {
_siguhandler[sig] = ohandler;
return (-1);
}
if (ovec) {
if (oact.sa_handler == SIG_DFL || oact.sa_handler == SIG_IGN)
ovec->sv_handler = oact.sa_handler;
else
ovec->sv_handler = ohandler;
ovec->sv_mask = set2mask(&oact.sa_mask);
ovec->sv_flags = 0;
if (oact.sa_flags & SA_ONSTACK)
ovec->sv_flags |= SV_ONSTACK;
if (oact.sa_flags & SA_RESETHAND)
ovec->sv_flags |= SV_RESETHAND;
if (!(oact.sa_flags & SA_RESTART))
ovec->sv_flags |= SV_INTERRUPT;
}
return (0);
}
int
_sigstack(struct sigstack *nss, struct sigstack *oss)
{
struct sigaltstack nalt;
struct sigaltstack oalt;
struct sigaltstack *naltp;
if (nss) {
/*
* assumes stack growth is down (like sparc and x86)
*/
nalt.ss_sp = nss->ss_sp - SIGSTKSZ;
nalt.ss_size = SIGSTKSZ;
nalt.ss_flags = 0;
naltp = &nalt;
} else
naltp = (struct sigaltstack *)0;
if (sigaltstack(naltp, &oalt) < 0)
return (-1);
if (oss) {
/*
* assumes stack growth is down (like sparc and x86)
*/
oss->ss_sp = oalt.ss_sp + oalt.ss_size;
oss->ss_onstack = ((oalt.ss_flags & SS_ONSTACK) != 0);
}
return (0);
}
void (*
ucbsignal(int s, void (*a)()))()
{
struct sigvec osv;
struct sigvec nsv;
static int mask[NSIG];
static int flags[NSIG];
nsv.sv_handler = a;
nsv.sv_mask = mask[s];
nsv.sv_flags = flags[s];
if (ucbsigvec(s, &nsv, &osv) < 0)
return (SIG_ERR);
if (nsv.sv_mask != osv.sv_mask || nsv.sv_flags != osv.sv_flags) {
mask[s] = nsv.sv_mask = osv.sv_mask;
flags[s] = nsv.sv_flags =
osv.sv_flags & ~(SV_RESETHAND|SV_INTERRUPT);
if (ucbsigvec(s, &nsv, (struct sigvec *)0) < 0)
return (SIG_ERR);
}
return (osv.sv_handler);
}
void (*
usignal(int s, void (*a)()))()
{
return (ucbsignal(s, a));
}
/*
* Set signal state to prevent restart of system calls
* after an instance of the indicated signal.
*/
int
_siginterrupt(int sig, int flag)
{
return (ucbsiginterrupt(sig, flag));
}
int
ucbsiginterrupt(int sig, int flag)
{
struct sigvec sv;
int ret;
if ((ret = ucbsigvec(sig, 0, &sv)) < 0)
return (ret);
if (flag)
sv.sv_flags |= SV_INTERRUPT;
else
sv.sv_flags &= ~SV_INTERRUPT;
return (ucbsigvec(sig, &sv, 0));
}