_setjmp.S revision 1.19
1 /* $NetBSD: _setjmp.S,v 1.19 2025/05/06 20:21:33 uwe 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(__ARM_PCS_VFP) 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 59 ENTRY(_setjmp) 60 ldr r1, .L_setjmp_magic 61 62 #if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2)) 63 ldr r2, .Lfpu_present 64 #ifdef __PIC__ 65 add r2, r2, pc /* pc = &.LPIC0 */ 66 #endif 67 ldr r2, [r2] 68 .LPIC0: 69 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 70 cbz r2, 1f 71 #else 72 cmp r2, #0 /* do we have a FPU? */ 73 beq 1f /* no, don't save VFP registers */ 74 #endif 75 76 orrs r1, r1, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP) 77 /* change magic to VFP magic */ 78 adds r2, r0, #(_JB_REG_D8 * 4) 79 vstmia r2, {d8-d15} 80 vmrs r2, fpscr 81 str r2, [r0, #(_JB_REG_FPSCR * 4)] 82 1: 83 #endif /* __ARM_EABI__ && (_ARM_ARCH_T2 || !__thumb__) */ 84 85 str r1, [r0] 86 87 adds r0, r0, #(_JB_REG_R4 * 4) 88 /* Store integer registers */ 89 #if !defined(__thumb__) || defined(_ARCH_ARCH_T2) 90 stmia r0, {r4-r14} 91 #else 92 stmia r0!, {r4-r7} 93 mov r1, r8 94 mov r2, r9 95 mov r3, r10 96 stmia r0!, {r1-r3} 97 mov r2, r11 98 mov r3, r12 99 stmia r0!, {r2-r3} 100 mov r2, sp 101 mov r3, lr 102 stmia r0!, {r2-r3} 103 #endif 104 105 movs r0, #0 106 RET 107 108 #if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2)) 109 .align 0 110 .Lfpu_present: 111 .word REL_SYM(_libc_arm_fpu_present, .LPIC0) 112 #endif /* __ARM_EABI__ && (_ARM_ARCH_T2 || !__thumb__) */ 113 END(_setjmp) 114 115 ENTRY(_longjmp) 116 ldr r2, [r0] /* get magic from jmp_buf */ 117 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 118 bics r3, r2, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP) 119 /* ignore VFP-ness of magic */ 120 ldr ip, .L_setjmp_magic /* load magic */ 121 #else 122 ldr r3, .L_setjmp_magic /* load magic */ 123 mov ip, r3 124 movs r3, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP) 125 ands r3, r3, r2 126 eors r3, r3, r2 /* ignore VFP-ness of magic */ 127 #endif 128 cmp ip, r3 /* magic correct? */ 129 bne botch /* no, botch */ 130 131 #if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2)) 132 cmp r3, r2 /* did magic change? */ 133 beq 1f /* no, don't restore VFP */ 134 adds r3, r0, #(_JB_REG_D8 * 4) 135 vldmia r3, {d8-d15} 136 ldr r3, [r0, #(_JB_REG_FPSCR * 4)] 137 vmsr fpscr, r3 138 1: 139 #endif /* __ARM_EABI__ && (_ARM_ARCH_T2 || !__thumb__) */ 140 141 adds r0, r0, #(_JB_REG_R4 * 4) 142 /* Restore integer registers */ 143 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 144 ldmia r0!, {r4-r12} 145 #else 146 ldmia r0!, {r4-r7} 147 ldmia r0!, {r2-r3} 148 mov r8, r2 149 mov r9, r3 150 ldmia r0!, {r2-r3} 151 mov r10, r2 152 mov r1, r3 153 adds r0, r0, #4 /* skip r12 */ 154 #endif 155 ldmia r0!, {r2-r3} /* r2 = sp, r3 = lr */ 156 157 /* Validate sp and r14 */ 158 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 159 cbz r2, botch 160 #else 161 cmp r2, #0 162 beq botch 163 #endif 164 mov sp, r2 165 166 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 167 cbz r3, botch 168 #else 169 cmp r3, #0 170 beq botch 171 #endif 172 mov lr, r3 173 174 /* Set return value */ 175 movs r0, r1 176 #ifdef __thumb__ 177 bne 1f 178 movs r0, #1 179 1: 180 #else 181 moveq r0, #1 182 #endif 183 RET 184 185 /* validation failed, die die die. */ 186 botch: 187 bl PLT_SYM(_C_LABEL(longjmperror)) 188 bl PLT_SYM(_C_LABEL(abort)) 189 1: b 1b /* Cannot get here */ 190 191 .align 0 192 .L_setjmp_magic: 193 .word _JB_MAGIC__SETJMP 194 END(_longjmp) 195
Indexes created Mon Sep 29 03:10:08 GMT 2025