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(__ARM_EABI__) && !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(__ARM_EABI__) && !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 /* __ARM_EABI__ */ 83 84 str r1, [r0] 85 86 add r0, r0, #(_JB_REG_R4 * 4) 87 /* Store integer registers */ 88 stmia r0, {r4-r14} 89 90 mov r0, #0x00000000 91 RET 92 93.L_setjmp_magic: 94 .word _JB_MAGIC__SETJMP 95#if defined(__ARM_EABI__) && !defined(_STANDALONE) 96 GOT_INITSYM(.L_setjmp_got, .L_setjmp_gotinit) 97.Lfpu_present: 98 .word PIC_SYM(_libc_arm_fpu_present, GOTOFF) 99#endif /* __ARM_EABI__ */ 100 101WEAK_ALIAS(___longjmp, _longjmp) 102ENTRY(_longjmp) 103 ldr r2, [r0] /* get magic from jmp_buf */ 104 bic r3, r2, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP) 105 /* ignore VFP-ness of magic */ 106 ldr ip, .L_setjmp_magic /* load magic */ 107 teq ip, r3 /* magic correct? */ 108 bne botch /* no, botch */ 109 110#if defined(__ARM_EABI__) && !defined(_STANDALONE) 111 teq r3, r2 /* did magic change? */ 112 beq 1f /* no, don't restore VFP */ 113 add ip, r0, #(_JB_REG_D8 * 4) 114 vldmia ip, {d8-d15} 115 ldr ip, [r0, #(_JB_REG_FPSCR * 4)] 116 vmsr fpscr, ip 1171: 118#endif /* __ARM_EABI__ */ 119 120 add r0, r0, #(_JB_REG_R4 * 4) 121 /* Restore integer registers */ 122 ldmia r0, {r4-r14} 123 124 /* Validate sp and r14 */ 125 teq sp, #0 126 teqne r14, #0 127 beq botch 128 129 /* Set return value */ 130 movs r0, r1 131 moveq r0, #0x00000001 132 RET 133 134 /* validation failed, die die die. */ 135botch: 136#if !defined(_STANDALONE) 137 bl PIC_SYM(_C_LABEL(longjmperror), PLT) 138 bl PIC_SYM(_C_LABEL(abort), PLT) 139 b . - 8 /* Cannot get here */ 140#else 141 b . 142#endif 143