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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 #pragma weak siglongjmp = _siglongjmp 34 35 #include "lint.h" 36 #include <sys/types.h> 37 #include <sys/stack.h> 38 #include <sys/frame.h> 39 #include <memory.h> 40 #include <ucontext.h> 41 #include <setjmp.h> 42 #include "sigjmp_struct.h" 43 #include "libc.h" 44 45 void 46 _siglongjmp(sigjmp_buf env, int val) 47 { 48 extern void _fetch_globals(greg_t *); 49 ucontext_t uc; 50 greg_t *reg = uc.uc_mcontext.gregs; 51 volatile sigjmp_struct_t *bp = (sigjmp_struct_t *)env; 52 greg_t fp = bp->sjs_fp; 53 greg_t i7 = bp->sjs_i7; 54 55 /* 56 * Create a ucontext_t structure from scratch. 57 * We only need to fetch the globals. 58 * The outs are assumed to be trashed on return from sigsetjmp(). 59 * The ins and locals are restored from the resumed register window. 60 * The floating point state is unmodified. 61 * Everything else is in the sigjmp_struct_t buffer. 62 */ 63 (void) memset(&uc, 0, sizeof (uc)); 64 uc.uc_flags = UC_STACK | UC_CPU; 65 _fetch_globals(®[REG_G1]); 66 uc.uc_stack = bp->sjs_stack; 67 uc.uc_link = bp->sjs_uclink; 68 reg[REG_PC] = bp->sjs_pc; 69 reg[REG_nPC] = reg[REG_PC] + 0x4; 70 reg[REG_SP] = bp->sjs_sp; 71 72 if (bp->sjs_flags & JB_SAVEMASK) { 73 uc.uc_flags |= UC_SIGMASK; 74 uc.uc_sigmask = bp->sjs_sigmask; 75 } 76 77 if (val) 78 reg[REG_O0] = (greg_t)val; 79 else 80 reg[REG_O0] = (greg_t)1; 81 82 /* 83 * Copy the fp and i7 values into the register window save area. 84 * These may have been clobbered between calls to sigsetjmp 85 * and siglongjmp. For example, the save area could have been 86 * relocated to lower addresses and the original save area 87 * given to an alloca() call. Notice that all reads from 88 * the sigjmp_struct_t buffer should take place before the 89 * following two writes. It is possible that user code may 90 * move/copy the sigjmpbuf around, and overlap the original 91 * register window save area. 92 */ 93 if (bp->sjs_sp != 0 && (bp->sjs_flags & JB_FRAMEPTR)) { 94 struct frame *sp = (struct frame *)(bp->sjs_sp + STACK_BIAS); 95 sp->fr_savfp = (struct frame *)fp; 96 sp->fr_savpc = i7; 97 } 98 99 (void) setcontext(&uc); 100 } 101