_setjmp.S revision 1.18
1 /* $NetBSD: _setjmp.S,v 1.18 2025/05/03 19:57:13 riastradh 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 PCREL_GET(r2, .Lfpu_present, .LPIC0) 64 ldr r2, [r2] 65 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 66 cbz r2, 1f 67 #else 68 cmp r2, #0 /* do we have a FPU? */ 69 beq 1f /* no, don't save VFP registers */ 70 #endif 71 72 orrs r1, r1, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP) 73 /* change magic to VFP magic */ 74 adds r2, r0, #(_JB_REG_D8 * 4) 75 vstmia r2, {d8-d15} 76 vmrs r2, fpscr 77 str r2, [r0, #(_JB_REG_FPSCR * 4)] 78 1: 79 #endif /* __ARM_EABI__ && (_ARM_ARCH_T2 || !__thumb__) */ 80 81 str r1, [r0] 82 83 adds r0, r0, #(_JB_REG_R4 * 4) 84 /* Store integer registers */ 85 #if !defined(__thumb__) || defined(_ARCH_ARCH_T2) 86 stmia r0, {r4-r14} 87 #else 88 stmia r0!, {r4-r7} 89 mov r1, r8 90 mov r2, r9 91 mov r3, r10 92 stmia r0!, {r1-r3} 93 mov r2, r11 94 mov r3, r12 95 stmia r0!, {r2-r3} 96 mov r2, sp 97 mov r3, lr 98 stmia r0!, {r2-r3} 99 #endif 100 101 movs r0, #0 102 RET 103 104 #if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2)) 105 .align 0 106 .Lfpu_present: 107 .word PCREL_SYM(_libc_arm_fpu_present, .LPIC0) 108 #endif /* __ARM_EABI__ && (_ARM_ARCH_T2 || !__thumb__) */ 109 END(_setjmp) 110 111 ENTRY(_longjmp) 112 ldr r2, [r0] /* get magic from jmp_buf */ 113 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 114 bics r3, r2, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP) 115 /* ignore VFP-ness of magic */ 116 ldr ip, .L_setjmp_magic /* load magic */ 117 #else 118 ldr r3, .L_setjmp_magic /* load magic */ 119 mov ip, r3 120 movs r3, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP) 121 ands r3, r3, r2 122 eors r3, r3, r2 /* ignore VFP-ness of magic */ 123 #endif 124 cmp ip, r3 /* magic correct? */ 125 bne botch /* no, botch */ 126 127 #if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2)) 128 cmp r3, r2 /* did magic change? */ 129 beq 1f /* no, don't restore VFP */ 130 adds r3, r0, #(_JB_REG_D8 * 4) 131 vldmia r3, {d8-d15} 132 ldr r3, [r0, #(_JB_REG_FPSCR * 4)] 133 vmsr fpscr, r3 134 1: 135 #endif /* __ARM_EABI__ && (_ARM_ARCH_T2 || !__thumb__) */ 136 137 adds r0, r0, #(_JB_REG_R4 * 4) 138 /* Restore integer registers */ 139 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 140 ldmia r0!, {r4-r12} 141 #else 142 ldmia r0!, {r4-r7} 143 ldmia r0!, {r2-r3} 144 mov r8, r2 145 mov r9, r3 146 ldmia r0!, {r2-r3} 147 mov r10, r2 148 mov r1, r3 149 adds r0, r0, #4 /* skip r12 */ 150 #endif 151 ldmia r0!, {r2-r3} /* r2 = sp, r3 = lr */ 152 153 /* Validate sp and r14 */ 154 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 155 cbz r2, botch 156 #else 157 cmp r2, #0 158 beq botch 159 #endif 160 mov sp, r2 161 162 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 163 cbz r3, botch 164 #else 165 cmp r3, #0 166 beq botch 167 #endif 168 mov lr, r3 169 170 /* Set return value */ 171 movs r0, r1 172 #ifdef __thumb__ 173 bne 1f 174 movs r0, #1 175 1: 176 #else 177 moveq r0, #1 178 #endif 179 RET 180 181 /* validation failed, die die die. */ 182 botch: 183 bl PLT_SYM(_C_LABEL(longjmperror)) 184 bl PLT_SYM(_C_LABEL(abort)) 185 1: b 1b /* Cannot get here */ 186 187 .align 0 188 .L_setjmp_magic: 189 .word _JB_MAGIC__SETJMP 190 END(_longjmp) 191
Indexes created Fri Oct 03 02:09:57 GMT 2025