1/* $NetBSD: compat_setjmp.S,v 1.5 2020/12/05 11:18:21 skrll 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#include <machine/asm.h> 36#include <machine/setjmp.h> 37 38/* 39 * C library -- setjmp, longjmp 40 * 41 * longjmp(a,v) 42 * will generate a "return(v)" from the last call to 43 * setjmp(a) 44 * by restoring registers from the stack. 45 * The previous signal state is restored. 46 */ 47 48ENTRY(setjmp) 49 /* Block all signals and retrieve the old signal mask */ 50 push {r0, lr} 51 movs r0, #0x00000000 52 53 bl PLT_SYM(_C_LABEL(sigblock)) 54 mov r1, r0 55 56 /* Store signal mask */ 57 str r1, [r0, #(_JB_SIGMASK * 4)] 58 59 ldr r1, .Lsetjmp_magic 60 str r1, [r0] 61 62 /* Store integer registers */ 63 adds r0, r0, #(_JB_REG_R4 * 4) 64#ifdef __thumb__ 65#ifdef _ARM_ARCH_7 66 stmia r0!, {r4-r12} 67 str sp, [r0, #0] 68 str lr, [r0, #4] 69#else 70 stmia r0!, {r4-r7} 71 mov r2, r8 72 mov r3, r9 73 stmia r0!, {r2-r3} 74 mov r1, r10 75 mov r2, r11 76 mov r3, r12 77 stmia r0!, {r1-r3} 78 mov r2, sp 79 mov r3, lr 80 stmia r0!, {r2-r3} 81#endif 82#else 83 stmia r0, {r4-lr} 84#endif 85 movs r0, #0 86 pop {r3, pc} 87END(setjmp) 88 89ENTRY(longjmp) 90 ldr r2, .Lsetjmp_magic 91 ldr r3, [r0] 92 cmp r2, r3 93 bne botch 94 95 /* Fetch signal mask */ 96 ldr r2, [r0, #(_JB_SIGMASK * 4)] 97 98 /* Set signal mask */ 99 push {r0, r1} /* don't care about lr */ 100 101 mov r0, r2 102 bl PLT_SYM(_C_LABEL(sigsetmask)) 103 104 pop {r0, r1} 105 106 /* Restore integer registers */ 107 adds r0, r0, #(_JB_REG_R4 * 4) 108#if !defined(__thumb__) || defined(_ARM_ARCH_7) 109 ldmia r0!, {r4-r12} 110#else 111 ldmia r0!, {r4-r7} 112 ldmia r0!, {r2-r3} 113 mov r8, r2 114 mov r9, r3 115 ldmia r0!, {r1-r3} 116 mov r10, r2 117 mov r11, r3 118 ldmia r0!, {r2} 119 mov r12, r2 120#endif 121 122 ldmia r0!, {r2-r3} /* r2 = sp, r3 = lr */ 123 124 /* Validate sp */ 125 cmp r2, #0 126 beq botch 127 mov sp, r2 128 129 /* Validate lr */ 130 cmp r3, #0 131 beq botch 132 mov lr, r3 133 134 /* Set return value */ 135 mov r0, r1 136 cmp r0, #0 137#ifdef __thumb__ 138 bne 1f 139 movs r0, #1 1401: 141#else 142 moveq r0, #1 143#endif 144 RET 145 146 /* validation failed, die die die. */ 147botch: 148 bl PLT_SYM(_C_LABEL(longjmperror)) 149 bl PLT_SYM(_C_LABEL(abort)) 1502: b 2b /* Cannot get here */ 151 152 .align 0 153.Lsetjmp_magic: 154 .word _JB_MAGIC_SETJMP 155END(longjmp) 156