Home | History | Annotate | Download | only in gen
      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #pragma weak _siglongjmp = siglongjmp
     33 
     34 #include "lint.h"
     35 #include <sys/types.h>
     36 #include <sys/stack.h>
     37 #include <sys/frame.h>
     38 #include <memory.h>
     39 #include <ucontext.h>
     40 #include <setjmp.h>
     41 #include "sigjmp_struct.h"
     42 #include "libc.h"
     43 
     44 void
     45 siglongjmp(sigjmp_buf env, int val)
     46 {
     47 	extern void _fetch_globals(greg_t *);
     48 	ucontext_t uc;
     49 	greg_t *reg = uc.uc_mcontext.gregs;
     50 	volatile sigjmp_struct_t *bp = (sigjmp_struct_t *)env;
     51 	greg_t fp = bp->sjs_fp;
     52 	greg_t i7 = bp->sjs_i7;
     53 
     54 	/*
     55 	 * Create a ucontext_t structure from scratch.
     56 	 * We only need to fetch the globals.
     57 	 * The outs are assumed to be trashed on return from sigsetjmp().
     58 	 * The ins and locals are restored from the resumed register window.
     59 	 * The floating point state is unmodified.
     60 	 * Everything else is in the sigjmp_struct_t buffer.
     61 	 */
     62 	(void) memset(&uc, 0, sizeof (uc));
     63 	uc.uc_flags = UC_STACK | UC_CPU;
     64 	_fetch_globals(&reg[REG_G1]);
     65 	uc.uc_stack = bp->sjs_stack;
     66 	uc.uc_link = bp->sjs_uclink;
     67 	reg[REG_PC] = bp->sjs_pc;
     68 	reg[REG_nPC] = reg[REG_PC] + 0x4;
     69 	reg[REG_SP] = bp->sjs_sp;
     70 
     71 	if (bp->sjs_flags & JB_SAVEMASK) {
     72 		uc.uc_flags |= UC_SIGMASK;
     73 		uc.uc_sigmask = bp->sjs_sigmask;
     74 	}
     75 
     76 	if (val)
     77 		reg[REG_O0] = (greg_t)val;
     78 	else
     79 		reg[REG_O0] = (greg_t)1;
     80 
     81 	/*
     82 	 * Copy the fp and i7 values into the register window save area.
     83 	 * These may have been clobbered between calls to sigsetjmp
     84 	 * and siglongjmp.  For example, the save area could have been
     85 	 * relocated to lower addresses and the original save area
     86 	 * given to an alloca() call.  Notice that all reads from
     87 	 * the sigjmp_struct_t buffer should take place before the
     88 	 * following two writes.  It is possible that user code may
     89 	 * move/copy the sigjmpbuf around, and overlap the original
     90 	 * register window save area.
     91 	 */
     92 	if (bp->sjs_sp != 0 && (bp->sjs_flags & JB_FRAMEPTR)) {
     93 		struct frame *sp = (struct frame *)(bp->sjs_sp + STACK_BIAS);
     94 		sp->fr_savfp = (struct frame *)fp;
     95 		sp->fr_savpc = i7;
     96 	}
     97 
     98 	(void) setcontext(&uc);
     99 }
    100