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#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 restored. 54 */ 55 56ENTRY(__setjmp14) 57 /* Get the signal mask. */ 58 stmfd sp!, {r0-r2, r14} 59 add r2, r0, #(_JB_SIGMASK * 4) 60 mov r1, #0x00000000 61 mov r0, #0x00000000 62 bl PIC_SYM(_C_LABEL(__sigprocmask14), PLT) 63 ldmfd sp!, {r0-r2, r14} 64 65 ldr r1, .Lsetjmp_magic 66 67#ifdef __ARM_EABI__ 68 ldr r2, .Lfpu_present 69#ifdef PIC 70 GOT_INIT(r3, .Lsetjmp_got, .Lsetjmp_gotinit) 71 ldr r2, [r2, r3] 72#else 73 ldr r2, [r2] 74#endif 75 teq r2, #0 /* do we have a FPU? */ 76 beq 1f /* no, don't save VFP registers */ 77 78 orr r1, r1, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 79 /* change magic to VFP magic */ 80 add r2, r0, #(_JB_REG_D8 * 4) 81 vstmia r2, {d8-d15} 82 vmrs r2, fpscr 83 str r2, [r0, #(_JB_REG_FPSCR * 4)] 841: 85#endif /* __ARM_EABI__ */ 86 87 str r1, [r0] /* store magic */ 88 89 /* Store integer registers */ 90 add r0, r0, #(_JB_REG_R4 * 4) 91 stmia r0, {r4-r14} 92 mov r0, #0x00000000 93 RET 94 95.Lsetjmp_magic: 96 .word _JB_MAGIC_SETJMP 97#ifdef __ARM_EABI__ 98 GOT_INITSYM(.Lsetjmp_got, .Lsetjmp_gotinit) 99.Lfpu_present: 100 .word PIC_SYM(_libc_arm_fpu_present, GOTOFF) 101#endif /* __ARM_EABI__ */ 102 103ENTRY(__longjmp14) 104 ldr r2, [r0] 105 ldr ip, .Lsetjmp_magic 106 bic r3, r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 107 teq r3, ip 108 bne .Lbotch 109 110 /* Restore the signal mask. */ 111 stmfd sp!, {r0-r2, r14} 112 mov r2, #0x00000000 113 add r1, r0, #(_JB_SIGMASK * 4) 114 mov r0, #3 /* SIG_SETMASK */ 115 bl PIC_SYM(_C_LABEL(__sigprocmask14), PLT) 116 ldmfd sp!, {r0-r2, r14} 117 118#ifdef __ARM_EABI__ 119 tst r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 120 /* is this a VFP magic? */ 121 beq 1f /* no, don't restore VFP */ 122 add ip, r0, #(_JB_REG_D8 * 4) 123 vldmia ip, {d8-d15} 124 ldr ip, [r0, #(_JB_REG_FPSCR * 4)] 125 vmsr fpscr, ip 1261: 127#endif /* __ARM_EABI__ */ 128 129 add r0, r0, #(_JB_REG_R4 * 4) 130 /* Restore integer registers */ 131 ldmia r0, {r4-r14} 132 133 /* Validate sp and r14 */ 134 teq sp, #0 135 teqne r14, #0 136 beq .Lbotch 137 138 /* Set return value */ 139 movs r0, r1 140 moveq r0, #0x00000001 141 RET 142 143 /* validation failed, die die die. */ 144.Lbotch: 145 bl PIC_SYM(_C_LABEL(longjmperror), PLT) 146 bl PIC_SYM(_C_LABEL(abort), PLT) 147 b . - 8 /* Cannot get here */ 148