setjmp.S revision 1.20
1 /* $NetBSD: setjmp.S,v 1.20 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 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 mov 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 PCREL_GET(r2, .Lfpu_present, .LPIC0) 79 ldr r2, [r2] 80 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 81 cbz r2, 1f /* don't save if we don't have a FPU */ 82 #else 83 cmp r2, #0 /* do we have a FPU? */ 84 beq 1f /* no, don't save VFP registers */ 85 #endif 86 87 orrs r1, r1, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 88 /* change magic to VFP magic */ 89 adds r2, r0, #(_JB_REG_D8 * 4) 90 vstmia r2, {d8-d15} 91 vmrs r2, fpscr 92 str r2, [r0, #(_JB_REG_FPSCR * 4)] 93 1: 94 #endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */ 95 96 str r1, [r0] /* store magic */ 97 98 /* Store integer registers */ 99 adds r0, r0, #(_JB_REG_R4 * 4) 100 #if !defined(__thumb__) 101 stmia r0!, {r4-lr} 102 #else 103 stmia r0!, {r4-r7} 104 mov r2, r8 105 mov r3, r9 106 stmia r0!, {r2-r3} 107 mov r2, r10 108 mov r3, r11 109 stmia r0!, {r2-r3} 110 mov r2, sp 111 mov r3, lr 112 str r2, [r0, #4] 113 str r3, [r0, #8] 114 #endif 115 movs r0, #0 116 RET 117 118 #if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2)) 119 .align 0 120 .Lfpu_present: 121 .word PCREL_SYM(_libc_arm_fpu_present, .LPIC0) 122 #endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */ 123 END(__setjmp14) 124 125 ENTRY(__longjmp14) 126 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 127 ldr r2, [r0] 128 ldr ip, .Lsetjmp_magic 129 bic r3, r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 130 #else 131 ldr r3, .Lsetjmp_magic 132 mov ip, r3 133 ldr r3, [r0] 134 movs r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 135 bics r3, r2 136 /* r2 is not the magic but we don't need it since we can't do VFP */ 137 #endif 138 cmp r3, ip 139 bne .Lbotch 140 141 /* Validate sp and lr */ 142 ldr r2, [r0, #(_JB_REG_R13 * 4)] 143 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 144 cbz r2, .Lbotch 145 #else 146 cmp r2, #0 147 beq .Lbotch 148 #endif 149 150 ldr r3, [r0, #(_JB_REG_R14 * 4)] 151 #if defined(__thumb__) && defined(_ARM_ARCH_T2) 152 cbz r3, .Lbotch 153 #else 154 cmp r3, #0 155 beq .Lbotch 156 #endif 157 mov sp, r2 158 mov lr, r3 159 160 /* Restore the signal mask. */ 161 push {r0-r2, lr} 162 movs r2, #0 163 #if !defined(__thumb__) 164 adds r1, r0, #(_JB_SIGMASK * 4) 165 #else 166 mov r1, r0 167 adds r1, r1, #(_JB_SIGMASK * 4) 168 #endif 169 movs r0, #3 /* SIG_SETMASK */ 170 bl PLT_SYM(_C_LABEL(__sigprocmask14)) 171 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 172 pop {r0-r2, lr} 173 #else 174 pop {r0-r3} 175 mov lr, r3 176 #endif 177 178 #if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2)) 179 tst r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP) 180 /* is this a VFP magic? */ 181 beq 1f /* no, don't restore VFP */ 182 adds r2, r0, #(_JB_REG_D8 * 4) 183 vldmia r2, {d8-d15} 184 ldr r2, [r0, #(_JB_REG_FPSCR * 4)] 185 vmsr fpscr, r2 186 1: 187 #endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */ 188 189 adds r0, r0, #(_JB_REG_R4 * 4) 190 /* Restore integer registers */ 191 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 192 ldmia r0!, {r4-r12} 193 #else 194 ldmia r0!, {r4-r7} 195 ldmia r0!, {r2-r3} 196 mov r8, r2 197 mov r9, r3 198 ldmia r0!, {r2-r3} 199 mov r10, r2 200 mov r11, r3 201 adds r0, r0, #4 /* skip ip(r12) */ 202 #endif 203 204 /* Set return value */ 205 movs r0, r1 206 #if !defined(__thumb__) 207 moveq r0, #1 208 #else 209 bne 1f 210 movs r0, #1 211 1: 212 #endif 213 RET 214 215 /* validation failed, die die die. */ 216 .Lbotch: 217 bl PLT_SYM(_C_LABEL(longjmperror)) 218 bl PLT_SYM(_C_LABEL(abort)) 219 1: b 1b /* Cannot get here */ 220 221 .align 0 222 .Lsetjmp_magic: 223 .word _JB_MAGIC_SETJMP 224 END(__longjmp14) 225
Indexes created Wed Oct 01 19:09:53 GMT 2025