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- /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
- /*
- * The contents of this file are subject to the Netscape Public License
- * Version 1.0 (the "NPL"); you may not use this file except in
- * compliance with the NPL. You may obtain a copy of the NPL at
- * http://www.mozilla.org/NPL/
- *
- * Software distributed under the NPL is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
- * for the specific language governing rights and limitations under the
- * NPL.
- *
- * The Initial Developer of this code under the NPL is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1998 Netscape Communications Corporation. All Rights
- * Reserved.
- */
-
- #include "primpl.h"
- #if defined(HPUX10_30) || defined(HPUX11)
- /* for fesettrapenable */
- #include <fenv.h>
- #else
- /* for fpsetmask */
- #include <math.h>
- #endif
- #include <setjmp.h>
- #include <signal.h>
- #include <values.h>
-
- /*
- ** On HP-UX we need to define a SIGFPE handler because coercion of a
- ** NaN to an int causes SIGFPE to be raised. Thanks to Marianne
- ** Mueller and Doug Priest at SunSoft for this fix.
- **
- ** Under DCE threads, sigaction() installs a per-thread signal handler,
- ** so we use the sigvector() interface to install a process-wide
- ** handler.
- */
-
- #ifdef _PR_DCETHREADS
- static void
- CatchFPE(int sig, int code, struct sigcontext *scp)
- {
- unsigned i, e;
- int r, t;
- int *source, *destination;
-
- /* check excepting instructions */
- for ( i = 0; i < 7; i++ ) {
- e = *(i+&(scp->sc_sl.sl_ss.ss_frexcp1));
- if ( e & 0xfc000000 != 0 ) {
- if ((e & 0xf4017720) == 0x24010200) {
- r = ((e >> 20) & 0x3e);
- t = (e & 0x1f) << 1;
- if (e & 0x08000000) {
- r |= (e >> 7) & 1;
- t |= (e >> 6) & 1;
- }
- source = (int *)(&scp->sc_sl.sl_ss.ss_frstat + r);
- destination = (int *)(&scp->sc_sl.sl_ss.ss_frstat + t);
- *destination = *source < 0 ? -MAXINT-1 : MAXINT;
- }
- }
- *(i+&(scp->sc_sl.sl_ss.ss_frexcp1)) = 0;
- }
-
- /* clear T-bit */
- scp->sc_sl.sl_ss.ss_frstat &= ~0x40;
- }
- #else /* _PR_DCETHREADS */
- static void
- CatchFPE(int sig, siginfo_t *info, void *context)
- {
- ucontext_t *ucp = (ucontext_t *) context;
- unsigned i, e;
- int r, t;
- int *source, *destination;
-
- /* check excepting instructions */
- for ( i = 0; i < 7; i++ ) {
- e = *(i+&(ucp->uc_mcontext.ss_frexcp1));
- if ( e & 0xfc000000 != 0 ) {
- if ((e & 0xf4017720) == 0x24010200) {
- r = ((e >> 20) & 0x3e);
- t = (e & 0x1f) << 1;
- if (e & 0x08000000) {
- r |= (e >> 7) & 1;
- t |= (e >> 6) & 1;
- }
- source = (int *)(&ucp->uc_mcontext.ss_frstat + r);
- destination = (int *)(&ucp->uc_mcontext.ss_frstat + t);
- *destination = *source < 0 ? -MAXINT-1 : MAXINT;
- }
- }
- *(i+&(ucp->uc_mcontext.ss_frexcp1)) = 0;
- }
-
- /* clear T-bit */
- ucp->uc_mcontext.ss_frstat &= ~0x40;
- }
- #endif /* _PR_DCETHREADS */
-
- void _MD_hpux_install_sigfpe_handler(void)
- {
- #ifdef _PR_DCETHREADS
- struct sigvec v;
-
- v.sv_handler = CatchFPE;
- v.sv_mask = 0;
- v.sv_flags = 0;
- sigvector(SIGFPE, &v, NULL);
- #else
- struct sigaction act;
-
- sigaction(SIGFPE, NULL, &act);
- act.sa_flags |= SA_SIGINFO;
- act.sa_sigaction = CatchFPE;
- sigaction(SIGFPE, &act, NULL);
- #endif /* _PR_DCETHREADS */
-
- #if defined(HPUX10_30) || defined(HPUX11)
- fesettrapenable(FE_INVALID);
- #else
- fpsetmask(FP_X_INV);
- #endif
- }
-
- #if !defined(PTHREADS_USER)
-
- void _MD_EarlyInit(void)
- {
- _MD_hpux_install_sigfpe_handler();
-
- #ifndef _PR_PTHREADS
- /*
- * The following piece of code is taken from ns/nspr/src/md_HP-UX.c.
- * In the comment for revision 1.6, dated 1995/09/11 23:33:34,
- * robm says:
- * This version has some problems which need to be addressed.
- * First, intercept all system calls and prevent them from
- * executing the library code which performs stack switches
- * before normal system call invocation. In order for library
- * calls which make system calls to work (like stdio), however,
- * we must also allocate our own stack and switch the primordial
- * stack to use it. This isn't so bad, except that I fudged the
- * backtrace length when copying the old stack to the new one.
- *
- * This is the original comment of robm in the code:
- * XXXrobm Horrific. To avoid a problem with HP's system call
- * code, we allocate a new stack for the primordial thread and
- * use it. However, we don't know how far back the original stack
- * goes. We should create a routine that performs a backtrace and
- * finds out just how much we need to copy. As a temporary measure,
- * I just copy an arbitrary guess.
- *
- * In an email to servereng dated 2 Jan 1997, Mike Patnode (mikep)
- * suggests that this only needs to be done for HP-UX 9.
- */
- #ifdef HPUX9
- #define PIDOOMA_STACK_SIZE 524288
- #define BACKTRACE_SIZE 8192
- {
- jmp_buf jb;
- char *newstack;
- char *oldstack;
-
- if(!setjmp(jb)) {
- newstack = (char *) PR_MALLOC(PIDOOMA_STACK_SIZE);
- oldstack = (char *) (*(((int *) jb) + 1) - BACKTRACE_SIZE);
- memcpy(newstack, oldstack, BACKTRACE_SIZE);
- *(((int *) jb) + 1) = (int) (newstack + BACKTRACE_SIZE);
- longjmp(jb, 1);
- }
- }
- #endif /* HPUX9 */
- #endif /* !_PR_PTHREADS */
- }
-
- PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
- {
- #ifndef _PR_PTHREADS
- if (isCurrent) {
- (void) setjmp(CONTEXT(t));
- }
- *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
- return (PRWord *) CONTEXT(t);
- #else
- *np = 0;
- return NULL;
- #endif
- }
-
- #ifndef _PR_PTHREADS
- void
- _MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
- {
- return;
- }
-
- PRStatus
- _MD_InitializeThread(PRThread *thread)
- {
- return PR_SUCCESS;
- }
-
- PRStatus
- _MD_WAIT(PRThread *thread, PRIntervalTime ticks)
- {
- PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
- _PR_MD_SWITCH_CONTEXT(thread);
- return PR_SUCCESS;
- }
-
- PRStatus
- _MD_WAKEUP_WAITER(PRThread *thread)
- {
- if (thread) {
- PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
- }
- return PR_SUCCESS;
- }
-
- /* These functions should not be called for HP-UX */
- void
- _MD_YIELD(void)
- {
- PR_NOT_REACHED("_MD_YIELD should not be called for HP-UX.");
- }
-
- PRStatus
- _MD_CREATE_THREAD(
- PRThread *thread,
- void (*start) (void *),
- PRThreadPriority priority,
- PRThreadScope scope,
- PRThreadState state,
- PRUint32 stackSize)
- {
- PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for HP-UX.");
- }
- #endif /* _PR_PTHREADS */
-
- void
- _MD_suspend_thread(PRThread *thread)
- {
- #ifdef _PR_PTHREADS
- #endif
- }
-
- void
- _MD_resume_thread(PRThread *thread)
- {
- #ifdef _PR_PTHREADS
- #endif
- }
- #endif /* PTHREADS_USER */
-
- /*
- * See if we have the privilege to set the scheduling policy and
- * priority of threads. Returns 0 if privilege is available.
- * Returns EPERM otherwise.
- */
-
- #if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
- PRIntn pt_hpux_privcheck()
- {
- PRIntn policy;
- struct sched_param schedule;
- PRIntn rv;
- pthread_t me = pthread_self();
-
- rv = pthread_getschedparam(me, &policy, &schedule);
- PR_ASSERT(0 == rv);
- rv = pthread_setschedparam(me, policy, &schedule);
- PR_ASSERT(0 == rv || EPERM == rv);
- return rv;
- }
- #endif
-
- /*
- * The HP version of strchr is buggy. It looks past the end of the
- * string and causes a segmentation fault when our (NSPR) version
- * of malloc is used.
- *
- * A better solution might be to put a cushion in our malloc just in
- * case HP's version of strchr somehow gets used instead of this one.
- */
- char *
- strchr(const char *s, int c)
- {
- char ch;
-
- if (!s) {
- return NULL;
- }
-
- ch = (char) c;
-
- while ((*s) && ((*s) != ch)) {
- s++;
- }
-
- if ((*s) == ch) {
- return (char *) s;
- }
-
- return NULL;
- }
-
- /*
- * Implemementation of memcmp in HP-UX (verified on releases A.09.03,
- * A.09.07, and B.10.10) dumps core if called with:
- * 1. First operand with address = 1(mod 4).
- * 2. Size = 1(mod 4)
- * 3. Last byte of the second operand is the last byte of the page and
- * next page is not accessible(not mapped or protected)
- * Thus, using the following naive version (tons of optimizations are
- * possible;^)
- */
-
- int memcmp(const void *s1, const void *s2, size_t n)
- {
- register unsigned char *p1 = (unsigned char *) s1,
- *p2 = (unsigned char *) s2;
-
- while (n-- > 0) {
- register int r = ((int) ((unsigned int) *p1))
- - ((int) ((unsigned int) *p2));
- if (r) return r;
- p1++; p2++;
- }
- return 0;
- }
-