setjmp.S revision 1.12
11.12Schristos/* $NetBSD: setjmp.S,v 1.12 2006/03/09 16:20:27 christos Exp $ */ 21.5Sthorpej 31.1Spaulus/*- 41.1Spaulus * Copyright (c) 1990 The Regents of the University of California. 51.1Spaulus * All rights reserved. 61.1Spaulus * 71.1Spaulus * This code is derived from software contributed to Berkeley by 81.1Spaulus * the Systems Programming Group of the University of Utah Computer 91.1Spaulus * Science Department. 101.1Spaulus * 111.1Spaulus * Redistribution and use in source and binary forms, with or without 121.1Spaulus * modification, are permitted provided that the following conditions 131.1Spaulus * are met: 141.1Spaulus * 1. Redistributions of source code must retain the above copyright 151.1Spaulus * notice, this list of conditions and the following disclaimer. 161.1Spaulus * 2. Redistributions in binary form must reproduce the above copyright 171.1Spaulus * notice, this list of conditions and the following disclaimer in the 181.1Spaulus * documentation and/or other materials provided with the distribution. 191.11Sagc * 3. Neither the name of the University nor the names of its contributors 201.1Spaulus * may be used to endorse or promote products derived from this software 211.1Spaulus * without specific prior written permission. 221.1Spaulus * 231.1Spaulus * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 241.1Spaulus * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 251.1Spaulus * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 261.1Spaulus * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 271.1Spaulus * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 281.1Spaulus * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 291.1Spaulus * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 301.1Spaulus * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 311.1Spaulus * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 321.1Spaulus * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 331.1Spaulus * SUCH DAMAGE. 341.1Spaulus */ 351.1Spaulus 361.6Sthorpej#include <machine/asm.h> 371.5Sthorpej 381.1Spaulus#if defined(LIBC_SCCS) && !defined(lint) 391.5Sthorpej#if 0 401.5Sthorpej RCSID("from: @(#)setjmp.s 5.1 (Berkeley) 5/12/90") 411.5Sthorpej#else 421.12Schristos RCSID("$NetBSD: setjmp.S,v 1.12 2006/03/09 16:20:27 christos Exp $") 431.5Sthorpej#endif 441.1Spaulus#endif /* LIBC_SCCS and not lint */ 451.1Spaulus 461.1Spaulus/* 471.1Spaulus * C library -- setjmp, longjmp 481.1Spaulus * 491.1Spaulus * longjmp(a,v) 501.1Spaulus * will generate a "return(v)" from 511.1Spaulus * the last call to 521.1Spaulus * setjmp(a) 531.1Spaulus * by restoring registers from the stack, 541.1Spaulus * and a struct sigcontext, see <signal.h> 551.1Spaulus */ 561.1Spaulus 571.12SchristosENTRY(__setjmp14) 581.12Schristos /* Get signal stack info. Note overlay of ss_sp and ss_size! */ 591.12Schristos lea %sp@(-12),%sp /* sizeof(stack_t) */ 601.12Schristos clrl %sp@ /* ss = NULL */ 611.12Schristos movl %sp,%sp@(4) /* oss = stack_t on stack */ 621.9Sitohy jbsr PIC_PLT(_C_LABEL(__sigaltstack14)) 631.12Schristos 641.12Schristos movl %sp@(8),%d0 /* ss_flags */ 651.12Schristos andl #1,%d0 /* extract SS_ONSTACK */ 661.12Schristos lea %sp@(12),%sp /* pop stack_t */ 671.12Schristos 681.12Schristos /* Get pointer to jmp_buf; a sigcontext is at the beginning. */ 691.12Schristos movl %sp@(4),%a0 701.12Schristos movl %d0,%a0@ /* store onstack */ 711.12Schristos clrl %a0@(4) /* unused word (old style signal mask) */ 721.12Schristos 731.12Schristos /* Get the signal mask. */ 741.12Schristos pea %a0@(28) /* oset = &sc.sc_mask */ 751.12Schristos movl #0,%sp@- /* set = NULL */ 761.12Schristos movl #0,%sp@- /* action = 0 <ignored> */ 771.12Schristos jbsr PIC_PLT(_C_LABEL(__sigprocmask14)) 781.12Schristos addl #12,%sp 791.12Schristos 801.12Schristos movl %sp@(4),%a0 /* get jmp_buf pointer again */ 811.12Schristos lea %sp@(4),%a1 /* adjust SP since we won't rts */ 821.12Schristos movl %a1,%a0@(8) /* save SP */ 831.12Schristos movl %a6,%a0@(12) /* save FP */ 841.12Schristos clrl %a0@(16) /* no AP */ 851.12Schristos movl %sp@,%a0@(20) /* save return PC */ 861.12Schristos clrl %a0@(24) /* clear PS */ 871.12Schristos 881.12Schristos /* Save remaining non-scratch regs after signal mask. */ 891.12Schristos moveml #0x3CFC,%a0@(44) 901.12Schristos 911.10Sthorpej clrl %d0 /* return 0 */ 921.1Spaulus rts 931.1Spaulus 94