_setjmp.S revision 137464
1129202Scognet/* $NetBSD: _setjmp.S,v 1.5 2003/04/05 23:08:51 bjh21 Exp $ */ 2129202Scognet 3129202Scognet/* 4129202Scognet * Copyright (c) 1997 Mark Brinicombe 5129202Scognet * All rights reserved. 6129202Scognet * 7129202Scognet * Redistribution and use in source and binary forms, with or without 8129202Scognet * modification, are permitted provided that the following conditions 9129202Scognet * are met: 10129202Scognet * 1. Redistributions of source code must retain the above copyright 11129202Scognet * notice, this list of conditions and the following disclaimer. 12129202Scognet * 2. Redistributions in binary form must reproduce the above copyright 13129202Scognet * notice, this list of conditions and the following disclaimer in the 14129202Scognet * documentation and/or other materials provided with the distribution. 15129202Scognet * 3. All advertising materials mentioning features or use of this software 16129202Scognet * must display the following acknowledgement: 17129202Scognet * This product includes software developed by Mark Brinicombe 18129202Scognet * 4. Neither the name of the University nor the names of its contributors 19129202Scognet * may be used to endorse or promote products derived from this software 20129202Scognet * without specific prior written permission. 21129202Scognet * 22129202Scognet * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23129202Scognet * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24129202Scognet * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25129202Scognet * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26129202Scognet * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27129202Scognet * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28129202Scognet * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29129202Scognet * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30129202Scognet * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31129202Scognet * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32129202Scognet * SUCH DAMAGE. 33129202Scognet */ 34129202Scognet 35129202Scognet#include <machine/asm.h> 36129202Scognet__FBSDID("$FreeBSD: head/lib/libc/arm/gen/_setjmp.S 137464 2004-11-09 16:49:14Z cognet $"); 37137287Scognet 38129202Scognet/* 39129202Scognet * C library -- _setjmp, _longjmp 40129202Scognet * 41129202Scognet * _longjmp(a,v) 42129202Scognet * will generate a "return(v)" from the last call to 43129202Scognet * _setjmp(a) 44129202Scognet * by restoring registers from the stack. 45129202Scognet * The previous signal state is NOT restored. 46129202Scognet * 47129202Scognet * Note: r0 is the return value 48129202Scognet * r1-r3 are scratch registers in functions 49129202Scognet */ 50129202Scognet 51129202ScognetENTRY(_setjmp) 52129202Scognet ldr r1, .L_setjmp_magic 53129202Scognet str r1, [r0], #4 54129202Scognet#ifdef SOFTFLOAT 55129202Scognet add r0, r0, #52 56129202Scognet#else 57129202Scognet /* Store fp registers */ 58129202Scognet sfm f4, 4, [r0], #48 59129202Scognet /* Store fpsr */ 60129202Scognet rfs r1 61129202Scognet str r1, [r0], #0x0004 62129202Scognet#endif /* SOFTFLOAT */ 63129202Scognet /* Store integer registers */ 64129202Scognet stmia r0, {r4-r14} 65129202Scognet 66129202Scognet mov r0, #0x00000000 67137464Scognet RET 68129202Scognet 69129202Scognet.L_setjmp_magic: 70129202Scognet .word _JB_MAGIC__SETJMP 71129202Scognet 72137464ScognetWEAK_ALIAS(___longjmp, _longjmp) 73129202ScognetENTRY(_longjmp) 74129202Scognet ldr r2, .L_setjmp_magic 75129202Scognet ldr r3, [r0], #4 76129202Scognet teq r2, r3 77129202Scognet bne botch 78129202Scognet 79129202Scognet#ifdef SOFTFLOAT 80129202Scognet add r0, r0, #52 81129202Scognet#else 82129202Scognet /* Restore fp registers */ 83129202Scognet lfm f4, 4, [r0], #48 84129202Scognet /* Restore fpsr */ 85129202Scognet ldr r4, [r0], #0x0004 86129202Scognet wfs r4 87129202Scognet#endif /* SOFTFLOAT */ 88129202Scognet /* Restore integer registers */ 89129202Scognet ldmia r0, {r4-r14} 90129202Scognet 91129202Scognet /* Validate sp and r14 */ 92129202Scognet teq sp, #0 93129202Scognet teqne r14, #0 94129202Scognet beq botch 95129202Scognet 96129202Scognet /* Set return value */ 97129202Scognet mov r0, r1 98129202Scognet teq r0, #0x00000000 99129202Scognet moveq r0, #0x00000001 100137464Scognet RET 101129202Scognet 102129202Scognet /* validation failed, die die die. */ 103129202Scognetbotch: 104129202Scognet bl PIC_SYM(_C_LABEL(longjmperror), PLT) 105129202Scognet bl PIC_SYM(_C_LABEL(abort), PLT) 106129202Scognet b . - 8 /* Cannot get here */ 107