1/* $NetBSD: _setjmp.S,v 1.12 2013/04/19 13:45:45 matt 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#if !defined(__SOFTFP__) && !defined(__VFP_FP__) && !defined(__ARM_PCS) 36#error FPA is not supported anymore 37#endif 38 39#if !defined(_STANDALONE) 40 .fpu vfp 41#endif 42 43#include <machine/asm.h> 44#include <machine/setjmp.h> 45 46__FBSDID("$FreeBSD$"); 47 48/* 49 * C library -- _setjmp, _longjmp 50 * 51 * _longjmp(a,v) 52 * will generate a "return(v)" from the last call to 53 * _setjmp(a) 54 * by restoring registers from the stack. 55 * The previous signal state is NOT restored. 56 * 57 * Note: r0 is the return value 58 * r1-r3,ip are scratch registers in functions 59 */ 60 61ENTRY(_setjmp) 62 ldr r1, .L_setjmp_magic 63 64#if !defined(_STANDALONE) 65 ldr r2, .Lfpu_present 66#ifdef PIC 67 GOT_INIT(r3, .L_setjmp_got, .L_setjmp_gotinit) 68 ldr r2, [r2, r3] 69#else 70 ldr r2, [r2] 71#endif 72 teq r2, #0 /* do we have a FPU? */ 73 beq 1f /* no, don't save VFP registers */ 74 75 orr r1, r1, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP) 76 /* change magic to VFP magic */ 77 add r2, r0, #(_JB_REG_D8 * 4) 78 vstmia r2, {d8-d15} 79 vmrs r2, fpscr 80 str r2, [r0, #(_JB_REG_FPSCR * 4)] 811: 82#endif /* !_STANDALONE */ 83 84 str r1, [r0] 85 86 add r0, r0, #(_JB_REG_R4 * 4) 87 /* Store integer registers */ 88#ifndef __thumb__ 89 stmia r0, {r4-r14} 90#else 91 stmia r0, {r4-r12} 92 str r13, [r0, #((_JB_REG_R13 - _JB_REG_R4) * 4)] 93 str r14, [r0, #((_JB_REG_R14 - _JB_REG_R4) * 4)] 94#endif 95 96 mov r0, #0x00000000 97 RET 98END(_setjmp) 99 100.L_setjmp_magic: 101 .word _JB_MAGIC__SETJMP 102#if !defined(_STANDALONE) 103 GOT_INITSYM(.L_setjmp_got, .L_setjmp_gotinit) 104.Lfpu_present: 105 .word PIC_SYM(_libc_arm_fpu_present, GOTOFF) 106#endif /* !_STANDALONE */ 107 108WEAK_ALIAS(___longjmp, _longjmp) 109ENTRY(_longjmp) 110 ldr r2, [r0] /* get magic from jmp_buf */ 111 bic r3, r2, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP) 112 /* ignore VFP-ness of magic */ 113 ldr ip, .L_setjmp_magic /* load magic */ 114 teq ip, r3 /* magic correct? */ 115 bne botch /* no, botch */ 116 117#if !defined(_STANDALONE) 118 teq r3, r2 /* did magic change? */ 119 beq 1f /* no, don't restore VFP */ 120 add ip, r0, #(_JB_REG_D8 * 4) 121 vldmia ip, {d8-d15} 122 ldr ip, [r0, #(_JB_REG_FPSCR * 4)] 123 vmsr fpscr, ip 1241: 125#endif /* !_STANDALONE */ 126 127 add r0, r0, #(_JB_REG_R4 * 4) 128 /* Restore integer registers */ 129#ifndef __thumb__ 130 ldmia r0, {r4-r14} 131#else 132 ldmia r0, {r4-r12} 133 ldr r13, [r0, #((_JB_REG_R13 - _JB_REG_R4) * 4)] 134 ldr r14, [r0, #((_JB_REG_R14 - _JB_REG_R4) * 4)] 135#endif 136 137 /* Validate sp and r14 */ 138 teq sp, #0 139 it ne 140 teqne r14, #0 141 it eq 142 beq botch 143 144 /* Set return value */ 145 movs r0, r1 146 it eq 147 moveq r0, #0x00000001 148 RET 149 150 /* validation failed, die die die. */ 151botch: 152#if !defined(_STANDALONE) 153 bl PIC_SYM(_C_LABEL(longjmperror), PLT) 154 bl PIC_SYM(_C_LABEL(abort), PLT) 1551: b 1b /* Cannot get here */ 156#else 157 b . 158#endif 159END(_longjmp) 160 161 .section .note.GNU-stack,"",%progbits 162