1/* $NetBSD: _setjmp.S,v 1.3 2001/11/13 20:04:52 chris Exp $ */ 2 3/* 4 * Copyright (c) 1997 Mark Brinicombe 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Mark Brinicombe 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#include <machine/asm.h> 36#include <machine/setjmp.h> 37 38/* 39 * C library -- _setjmp, _longjmp 40 * 41 * _longjmp(a,v) 42 * will generate a "return(v)" from the last call to 43 * _setjmp(a) 44 * by restoring registers from the stack. 45 * The previous signal state is NOT restored. 46 * 47 * Note: r0 is the return value 48 * r1-r3 are scratch registers in functions 49 */ 50 51ENTRY(_setjmp) 52 ldr r1, L_setjmp_magic 53 str r1, [r0], #4 54#ifdef SOFTFLOAT 55 add r0, r0, #52 56#else 57 /* Store fp registers */ 58 sfm f4, 4, [r0], #48 59 /* Store fpsr */ 60 rfs r1 61 str r1, [r0], #0x0004 62#endif /* SOFTFLOAT */ 63 /* Store integer registers */ 64 stmia r0, {r4-r14} 65 66 mov r0, #0x00000000 67#ifdef __APCS_26__ 68 movs r15, r14 69#else 70 mov r15, r14 71#endif 72 73L_setjmp_magic: 74 .word _JB_MAGIC__SETJMP 75 76ENTRY(_longjmp) 77 ldr r2, L_setjmp_magic 78 ldr r3, [r0], #4 79 teq r2, r3 80 bne botch 81 82#ifdef SOFTFLOAT 83 add r0, r0, #52 84#else 85 /* Restore fp registers */ 86 lfm f4, 4, [r0], #48 87 /* Restore fpsr */ 88 ldr r4, [r0], #0x0004 89 wfs r4 90#endif /* SOFTFLOAT */ 91 /* Restore integer registers */ 92 ldmia r0, {r4-r14} 93 94 /* Validate sp and r14 */ 95 teq sp, #0 96 teqne r14, #0 97 beq botch 98 99 /* Set return value */ 100 mov r0, r1 101 teq r0, #0x00000000 102 moveq r0, #0x00000001 103#ifdef __APCS_26__ 104 movs r15, r14 105#else 106 mov r15, r14 107#endif 108 109 /* validation failed, die die die. */ 110botch: 111 bl PIC_SYM(_C_LABEL(longjmperror), PLT) 112 bl PIC_SYM(_C_LABEL(abort), PLT) 113 b . - 8 /* Cannot get here */ 114