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 #include "lint.h" 31 #include <sys/types.h> 32 #include <sys/stack.h> 33 #include <sys/frame.h> 34 #include <memory.h> 35 #include <ucontext.h> 36 #include <setjmp.h> 37 #include "sigjmp_struct.h" 38 #include "libc.h" 39 40 #pragma weak _siglongjmp = siglongjmp 41 42 void 43 siglongjmp(sigjmp_buf env, int val) 44 { 45 extern void _fetch_globals(greg_t *); 46 ucontext_t uc; 47 greg_t *reg = uc.uc_mcontext.gregs; 48 volatile sigjmp_struct_t *bp = (sigjmp_struct_t *)env; 49 greg_t fp = bp->sjs_fp; 50 greg_t i7 = bp->sjs_i7; 51 52 /* 53 * Create a ucontext_t structure from scratch. 54 * We only need to fetch the globals. 55 * The outs are assumed to be trashed on return from sigsetjmp(). 56 * The ins and locals are restored from the resumed register window. 57 * The floating point state is unmodified. 58 * Everything else is in the sigjmp_struct_t buffer. 59 */ 60 (void) memset(&uc, 0, sizeof (uc)); 61 uc.uc_flags = UC_STACK | UC_CPU; 62 _fetch_globals(®[REG_G1]); 63 uc.uc_stack = bp->sjs_stack; 64 uc.uc_link = bp->sjs_uclink; 65 reg[REG_PC] = bp->sjs_pc; 66 reg[REG_nPC] = reg[REG_PC] + 0x4; 67 reg[REG_SP] = bp->sjs_sp; 68 69 if (bp->sjs_flags & JB_SAVEMASK) { 70 uc.uc_flags |= UC_SIGMASK; 71 uc.uc_sigmask = bp->sjs_sigmask; 72 } 73 74 if (val) 75 reg[REG_O0] = (greg_t)val; 76 else 77 reg[REG_O0] = (greg_t)1; 78 79 /* 80 * Copy the fp and i7 values into the register window save area. 81 * These may have been clobbered between calls to sigsetjmp 82 * and siglongjmp. For example, the save area could have been 83 * relocated to lower addresses and the original save area 84 * given to an alloca() call. Notice that all reads from 85 * the sigjmp_struct_t buffer should take place before the 86 * following two writes. It is possible that user code may 87 * move/copy the sigjmpbuf around, and overlap the original 88 * register window save area. 89 */ 90 if (bp->sjs_sp != 0 && (bp->sjs_flags & JB_FRAMEPTR)) { 91 struct frame *sp = (struct frame *)(bp->sjs_sp + STACK_BIAS); 92 sp->fr_savfp = (struct frame *)fp; 93 sp->fr_savpc = i7; 94 } 95 96 (void) setcontext(&uc); 97 } 98