1 /* $NetBSD: setjmp.S,v 1.22 2025/05/08 00:28:31 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 restored. 54 */ 55 56 ENTRY(__setjmp14) 57 /* Get the signal mask. */ 58 push {r0-r2, lr} 59 #if !defined(__thumb__) 60 adds r2, r0, #(_JB_SIGMASK * 4) 61 #else 62 movs r2, r0 63 adds r2, r2, #(_JB_SIGMASK * 4) 64 #endif 65 movs r1, #0 66 movs r0, #0 67 bl PLT_SYM(_C_LABEL(__sigprocmask14)) 68 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 69 pop {r0-r2, lr} 70 #else 71 pop {r0-r3} 72 mov lr, r3 73 #endif 74 75 ldr r1, .Lsetjmp_magic 76 77 #if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2)) 78 ldr r2, .Lfpu_present 79 #ifdef __PIC__ 80 add r2, r2, pc /* pc = &.LPIC0 */ 81 #endif 82 ldr r2, [r2] 83 .LPIC0: 84 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 85 cbz r2, 1f /* don't save if we don't have a FPU */ 86 #else 87 cmp r2, #0 /* do we have a FPU? */ 88 beq 1f /* no, don't save VFP registers */ 89 #endif 90 91 orrs r1, r1, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 92 /* change magic to VFP magic */ 93 adds r2, r0, #(_JB_REG_D8 * 4) 94 vstmia r2, {d8-d15} 95 vmrs r2, fpscr 96 str r2, [r0, #(_JB_REG_FPSCR * 4)] 97 1: 98 #endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */ 99 100 str r1, [r0] /* store magic */ 101 102 /* Store integer registers */ 103 adds r0, r0, #(_JB_REG_R4 * 4) 104 #if !defined(__thumb__) 105 stmia r0!, {r4-lr} 106 #else 107 stmia r0!, {r4-r7} 108 mov r2, r8 109 mov r3, r9 110 stmia r0!, {r2-r3} 111 mov r2, r10 112 mov r3, r11 113 stmia r0!, {r2-r3} 114 mov r2, sp 115 mov r3, lr 116 str r2, [r0, #4] 117 str r3, [r0, #8] 118 #endif 119 movs r0, #0 120 RET 121 122 #if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2)) 123 .align 0 124 .Lfpu_present: 125 .word REL_SYM(_libc_arm_fpu_present, .LPIC0) 126 #endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */ 127 END(__setjmp14) 128 129 ENTRY(__longjmp14) 130 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 131 ldr r2, [r0] 132 ldr ip, .Lsetjmp_magic 133 bic r3, r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 134 #else 135 ldr r3, .Lsetjmp_magic 136 mov ip, r3 137 ldr r3, [r0] 138 movs r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 139 bics r3, r2 140 /* r2 is not the magic but we don't need it since we can't do VFP */ 141 #endif 142 cmp r3, ip 143 bne .Lbotch 144 145 /* Validate sp and lr */ 146 ldr r2, [r0, #(_JB_REG_R13 * 4)] 147 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 148 cbz r2, .Lbotch 149 #else 150 cmp r2, #0 151 beq .Lbotch 152 #endif 153 154 ldr r3, [r0, #(_JB_REG_R14 * 4)] 155 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 156 cbz r3, .Lbotch 157 #else 158 cmp r3, #0 159 beq .Lbotch 160 #endif 161 mov sp, r2 162 mov lr, r3 163 164 /* Restore the signal mask. */ 165 push {r0-r2, lr} 166 movs r2, #0 167 #if !defined(__thumb__) 168 adds r1, r0, #(_JB_SIGMASK * 4) 169 #else 170 movs r1, r0 171 adds r1, r1, #(_JB_SIGMASK * 4) 172 #endif 173 movs r0, #3 /* SIG_SETMASK */ 174 bl PLT_SYM(_C_LABEL(__sigprocmask14)) 175 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 176 pop {r0-r2, lr} 177 #else 178 pop {r0-r3} 179 mov lr, r3 180 #endif 181 182 #if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2)) 183 tst r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 184 /* is this a VFP magic? */ 185 beq 1f /* no, don't restore VFP */ 186 adds r2, r0, #(_JB_REG_D8 * 4) 187 vldmia r2, {d8-d15} 188 ldr r2, [r0, #(_JB_REG_FPSCR * 4)] 189 vmsr fpscr, r2 190 1: 191 #endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */ 192 193 adds r0, r0, #(_JB_REG_R4 * 4) 194 /* Restore integer registers */ 195 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 196 ldmia r0!, {r4-r12} 197 #else 198 ldmia r0!, {r4-r7} 199 ldmia r0!, {r2-r3} 200 mov r8, r2 201 mov r9, r3 202 ldmia r0!, {r2-r3} 203 mov r10, r2 204 mov r11, r3 205 adds r0, r0, #4 /* skip ip(r12) */ 206 #endif 207 208 /* Set return value */ 209 movs r0, r1 210 #if !defined(__thumb__) 211 moveq r0, #1 212 #else 213 bne 1f 214 movs r0, #1 215 1: 216 #endif 217 RET 218 219 /* validation failed, die die die. */ 220 .Lbotch: 221 bl PLT_SYM(_C_LABEL(longjmperror)) 222 bl PLT_SYM(_C_LABEL(abort)) 223 1: b 1b /* Cannot get here */ 224 225 .align 0 226 .Lsetjmp_magic: 227 .word _JB_MAGIC_SETJMP 228 END(__longjmp14) 229
Indexes created Sat Sep 20 22:09:52 GMT 2025