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#ifdef __ARM_EABI__ 40 .fpu vfp 41#endif 42 43#include <machine/asm.h> 44#include <machine/setjmp.h> 45 46/* 47 * C library -- _setjmp, _longjmp 48 * 49 * _longjmp(a,v) 50 * will generate a "return(v)" from the last call to 51 * _setjmp(a) 52 * by restoring registers from the stack. 53 * The previous signal state is NOT restored. 54 * 55 * Note: r0 is the return value 56 * r1-r3,ip are scratch registers in functions 57 */ 58 59ENTRY(_setjmp) 60 ldr r1, .L_setjmp_magic 61 62#ifdef __ARM_EABI__ 63 ldr r2, .Lfpu_present 64#ifdef PIC 65 GOT_INIT(r3, .L_setjmp_got, .L_setjmp_gotinit) 66 ldr r2, [r2, r3] 67#else 68 ldr r2, [r2] 69#endif 70 teq r2, #0 /* do we have a FPU? */ 71 beq 1f /* no, don't save VFP registers */ 72 73 orr r1, r1, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP) 74 /* change magic to VFP magic */ 75 add r2, r0, #(_JB_REG_D8 * 4) 76 vstmia r2, {d8-d15} 77 vmrs r2, fpscr 78 str r2, [r0, #(_JB_REG_FPSCR * 4)] 791: 80#endif /* __ARM_EABI__ */ 81 82 str r1, [r0] 83 84 add r0, r0, #(_JB_REG_R4 * 4) 85 /* Store integer registers */ 86 stmia r0, {r4-r14} 87 88 mov r0, #0x00000000 89 RET 90 91.L_setjmp_magic: 92 .word _JB_MAGIC__SETJMP 93#ifdef __ARM_EABI__ 94 GOT_INITSYM(.L_setjmp_got, .L_setjmp_gotinit) 95.Lfpu_present: 96 .word PIC_SYM(_libc_arm_fpu_present, GOTOFF) 97#endif /* __ARM_EABI__ */ 98 99ENTRY(_longjmp) 100 ldr r2, [r0] /* get magic from jmp_buf */ 101 bic r3, r2, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP) 102 /* ignore VFP-ness of magic */ 103 ldr ip, .L_setjmp_magic /* load magic */ 104 teq ip, r3 /* magic correct? */ 105 bne botch /* no, botch */ 106 107#ifdef __ARM_EABI__ 108 teq r3, r2 /* did magic change? */ 109 beq 1f /* no, don't restore VFP */ 110 add ip, r0, #(_JB_REG_D8 * 4) 111 vldmia ip, {d8-d15} 112 ldr ip, [r0, #(_JB_REG_FPSCR * 4)] 113 vmsr fpscr, ip 1141: 115#endif /* __ARM_EABI__ */ 116 117 add r0, r0, #(_JB_REG_R4 * 4) 118 /* Restore integer registers */ 119 ldmia r0, {r4-r14} 120 121 /* Validate sp and r14 */ 122 teq sp, #0 123 teqne r14, #0 124 beq botch 125 126 /* Set return value */ 127 movs r0, r1 128 moveq r0, #0x00000001 129 RET 130 131 /* validation failed, die die die. */ 132botch: 133 bl PIC_SYM(_C_LABEL(longjmperror), PLT) 134 bl PIC_SYM(_C_LABEL(abort), PLT) 135 b . - 8 /* Cannot get here */ 136