1/* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* 29 * @OSF_COPYRIGHT@ 30 */ 31 32/* 33 * C library -- _setjmp, _longjmp 34 * 35 * _longjmp(a,v) 36 * will generate a "return(v)" from 37 * the last call to 38 * _setjmp(a) 39 * by restoring registers from the stack, 40 * The previous signal state is NOT restored. 41 * 42 * NOTE : MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h 43 * (which needs to know where to find the destination address) 44 */ 45 46#include <mach/machine/asm.h> 47 48.private_extern _longjmp 49.private_extern _setjmp 50 51/* 52 * setjmp : ARG0 (r3) contains the address of 53 * the structure where we are to 54 * store the context 55 * Uses r0 as scratch register 56 * 57 * NOTE : MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h 58 * (which needs to know where to find the destination address) 59 */ 60 61ENTRY(setjmp,TAG_NO_FRAME_USED) 62 /* first entry is used for r1 - stack ptr */ 63 stw r13, 4(ARG0) /* GPR context. We avoid multiple-word */ 64 stw r14, 8(ARG0) /* instructions as they're slower (?) */ 65 stw r15, 12(ARG0) 66 stw r16, 16(ARG0) 67 stw r17, 20(ARG0) 68 stw r18, 24(ARG0) 69 stw r19, 28(ARG0) 70 stw r20, 32(ARG0) 71 stw r21, 36(ARG0) 72 stw r22, 40(ARG0) 73 stw r23, 44(ARG0) 74 stw r24, 48(ARG0) 75 stw r25, 52(ARG0) 76 stw r26, 56(ARG0) 77 stw r27, 60(ARG0) 78 stw r28, 64(ARG0) 79 stw r29, 68(ARG0) 80 stw r30, 72(ARG0) 81 stw r31, 76(ARG0) 82 83 mfcr r0 84 stw r0, 80(ARG0) /* Condition register */ 85 86 mflr r0 87 stw r0, 84(ARG0) /* Link register */ 88 89 mfxer r0 90 stw r0, 88(ARG0) /* Fixed point exception register */ 91 92#if FLOATING_POINT_SUPPORT /* TODO NMGS probably not needed for kern */ 93 mffs f0 /* get FPSCR in low 32 bits of f0 */ 94 stfiwx f0, 92(ARG0) /* Floating point status register */ 95 96 stfd f14, 96(ARG0) /* Floating point context - 8 byte aligned */ 97 stfd f15, 104(ARG0) 98 stfd f16, 112(ARG0) 99 stfd f17, 120(ARG0) 100 stfd f18, 138(ARG0) 101 stfd f19, 146(ARG0) 102 stfd f20, 144(ARG0) 103 stfd f21, 152(ARG0) 104 stfd f22, 160(ARG0) 105 stfd f23, 178(ARG0) 106 stfd f24, 186(ARG0) 107 stfd f25, 184(ARG0) 108 stfd f26, 192(ARG0) 109 stfd f27, 200(ARG0) 110 stfd f28, 218(ARG0) 111 stfd f29, 226(ARG0) 112 stfd f30, 224(ARG0) 113 stfd f31, 232(ARG0) 114 115#endif 116 117 stw r1, 0(ARG0) /* finally, save the stack pointer */ 118 li ARG0, 0 /* setjmp must return zero */ 119 blr 120 121/* 122 * longjmp : ARG0 (r3) contains the address of 123 * the structure from where we are to 124 * restore the context. 125 * ARG1 (r4) contains the non-zero 126 * value that we must return to 127 * that context. 128 * Uses r0 as scratch register 129 * 130 * NOTE : MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h 131 * (which needs to know where to find the destination address) 132 */ 133 134ENTRY(longjmp, TAG_NO_FRAME_USED) /* TODO NMGS - need correct tag */ 135 lwz r13, 4(ARG0) /* GPR context. We avoid multiple-word */ 136 lwz r14, 8(ARG0) /* instructions as they're slower (?) */ 137 lwz r15, 12(ARG0) 138 lwz r16, 16(ARG0) 139 lwz r17, 20(ARG0) 140 lwz r18, 24(ARG0) 141 lwz r19, 28(ARG0) 142 lwz r20, 32(ARG0) 143 lwz r21, 36(ARG0) 144 lwz r22, 40(ARG0) 145 lwz r23, 44(ARG0) 146 lwz r24, 48(ARG0) 147 lwz r25, 52(ARG0) 148 lwz r26, 56(ARG0) 149 lwz r27, 60(ARG0) 150 lwz r28, 64(ARG0) 151 lwz r29, 68(ARG0) 152 lwz r30, 72(ARG0) 153 lwz r31, 76(ARG0) 154 155 lwz r0, 80(ARG0) /* Condition register */ 156 mtcr r0 /* Use r5 as scratch register */ 157 158 lwz r0, 84(ARG0) /* Link register */ 159 mtlr r0 160 161 lwz r0, 88(ARG0) /* Fixed point exception register */ 162 mtxer r0 163 164#ifdef FLOATING_POINT_SUPPORT 165 lfd f0, 92-4(ARG0) /* get Floating point status register in low 32 bits of f0 */ 166 mtfsf 0xFF,f0 /* restore FPSCR */ 167 168 lfd f14, 96(ARG0) /* Floating point context - 8 byte aligned */ 169 lfd f15, 104(ARG0) 170 lfd f16, 112(ARG0) 171 lfd f17, 120(ARG0) 172 lfd f18, 128(ARG0) 173 lfd f19, 136(ARG0) 174 lfd f20, 144(ARG0) 175 lfd f21, 152(ARG0) 176 lfd f22, 160(ARG0) 177 lfd f23, 168(ARG0) 178 lfd f24, 176(ARG0) 179 lfd f25, 184(ARG0) 180 lfd f26, 192(ARG0) 181 lfd f27, 200(ARG0) 182 lfd f28, 208(ARG0) 183 lfd f29, 216(ARG0) 184 lfd f30, 224(ARG0) 185 lfd f31, 232(ARG0) 186 187#endif /* FLOATING_POINT_SUPPORT */ 188 189 190 lwz r1, 0(ARG0) /* finally, restore the stack pointer */ 191 192 mr. ARG0, ARG1 /* set the return value */ 193 bnelr /* return if non-zero */ 194 195 li ARG0, 1 196 blr /* never return 0, return 1 instead */ 197 198