1/* $NetBSD: setjmp.S,v 1.14 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 .fpu vfp 40 41#include <machine/asm.h> 42#include <machine/setjmp.h> 43 44__FBSDID("$FreeBSD$"); 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 restored. 54 */ 55 56ENTRY(setjmp) 57 /* Block all signals and retrieve the old signal mask */ 58 stmfd sp!, {r0, r14} 59 add r2, r0, #(_JB_SIGMASK * 4) /* oset */ 60 mov r1, #0x00000000 /* set */ 61 mov r0, #0x00000001 /* SIG_BLOCK */ 62 bl PIC_SYM(_C_LABEL(sigprocmask), PLT) 63 ldmfd sp!, {r0, r14} 64 65 ldr r1, .Lsetjmp_magic 66 67 ldr r2, .Lfpu_present 68#ifdef PIC 69 GOT_INIT(r3, .Lsetjmp_got, .Lsetjmp_gotinit) 70 ldr r2, [r2, r3] 71#else 72 ldr r2, [r2] 73#endif 74 teq r2, #0 /* do we have a FPU? */ 75 beq 1f /* no, don't save VFP registers */ 76 77 orr r1, r1, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 78 /* change magic to VFP magic */ 79 add r2, r0, #(_JB_REG_D8 * 4) 80 vstmia r2, {d8-d15} 81 vmrs r2, fpscr 82 str r2, [r0, #(_JB_REG_FPSCR * 4)] 831: 84 85 str r1, [r0] /* store magic */ 86 87 /* Store integer registers */ 88 add r0, r0, #(_JB_REG_R4 * 4) 89#ifndef __thumb__ 90 stmia r0, {r4-r14} 91#else 92 stmia r0, {r4-r12} 93 str r13, [r0, #((_JB_REG_R13 - _JB_REG_R4) * 4)] 94 str r14, [r0, #((_JB_REG_R14 - _JB_REG_R4) * 4)] 95#endif 96 mov r0, #0x00000000 97 RET 98 99.Lsetjmp_magic: 100 .word _JB_MAGIC_SETJMP 101 GOT_INITSYM(.Lsetjmp_got, .Lsetjmp_gotinit) 102.Lfpu_present: 103 .word PIC_SYM(_libc_arm_fpu_present, GOTOFF) 104END(setjmp) 105 106.weak _C_LABEL(longjmp) 107.set _C_LABEL(longjmp), _C_LABEL(__longjmp) 108ENTRY(__longjmp) 109 ldr r2, [r0] 110 ldr ip, .Lsetjmp_magic 111 bic r3, r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 112 teq r3, ip 113 bne .Lbotch 114 115 /* Restore the signal mask. */ 116 stmfd sp!, {r0-r2, r14} 117 mov r2, #0x00000000 118 add r1, r0, #(_JB_SIGMASK * 4) /* Signal mask */ 119 mov r0, #3 /* SIG_SETMASK */ 120 bl PIC_SYM(_C_LABEL(sigprocmask), PLT) 121 ldmfd sp!, {r0-r2, r14} 122 123 tst r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 124 /* is this a VFP magic? */ 125 beq 1f /* no, don't restore VFP */ 126 add ip, r0, #(_JB_REG_D8 * 4) 127 vldmia ip, {d8-d15} 128 ldr ip, [r0, #(_JB_REG_FPSCR * 4)] 129 vmsr fpscr, ip 1301: 131 132 add r0, r0, #(_JB_REG_R4 * 4) 133 /* Restore integer registers */ 134#ifndef __thumb__ 135 ldmia r0, {r4-r14} 136#else 137 ldmia r0, {r4-r12} 138 ldr r13, [r0, #((_JB_REG_R13 - _JB_REG_R4) * 4)] 139 ldr r14, [r0, #((_JB_REG_R14 - _JB_REG_R4) * 4)] 140#endif 141 142 /* Validate sp and r14 */ 143 teq sp, #0 144 it ne 145 teqne r14, #0 146 it eq 147 beq .Lbotch 148 149 /* Set return value */ 150 movs r0, r1 151 it eq 152 moveq r0, #0x00000001 153 RET 154 155 /* validation failed, die die die. */ 156.Lbotch: 157 bl PIC_SYM(_C_LABEL(longjmperror), PLT) 158 bl PIC_SYM(_C_LABEL(abort), PLT) 1591: b 1b /* Cannot get here */ 160END(__longjmp) 161