projects / apple / xnu.git / blame
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|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 8ad349bb | 4 | * @APPLE_LICENSE_OSREFERENCE_HEADER_START@ |
| 1c79356b | 5 | * |
| 8ad349bb A |
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 | |
| 10 | * License may not be used to create, or enable the creation or | |
| 11 | * redistribution of, unlawful or unlicensed copies of an Apple operating | |
| 12 | * system, or to circumvent, violate, or enable the circumvention or | |
| 13 | * violation of, any terms of an Apple operating system software license | |
| 14 | * agreement. | |
| 15 | * | |
| 16 | * Please obtain a copy of the License at | |
| 17 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 18 | * file. | |
| 19 | * | |
| 20 | * The Original Code and all software distributed under the License are | |
| 21 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 22 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 23 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 24 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 25 | * Please see the License for the specific language governing rights and | |
| 26 | * limitations under the License. | |
| 27 | * | |
| 28 | * @APPLE_LICENSE_OSREFERENCE_HEADER_END@ | |
| 1c79356b A |
29 | */ |
| 30 | /* | |
| 31 | * @OSF_COPYRIGHT@ | |
| 32 | */ | |
| 33 | ||
| 34 | /* | |
| 35 | * C library -- _setjmp, _longjmp | |
| 36 | * | |
| 37 | * _longjmp(a,v) | |
| 38 | * will generate a "return(v)" from | |
| 39 | * the last call to | |
| 40 | * _setjmp(a) | |
| 41 | * by restoring registers from the stack, | |
| 42 | * The previous signal state is NOT restored. | |
| 43 | * | |
| 44 | * NOTE : MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h | |
| 45 | * (which needs to know where to find the destination address) | |
| 46 | */ | |
| 47 | ||
| 48 | #include <ppc/asm.h> | |
| 49 | ||
| 50 | /* | |
| 51 | * setjmp : ARG0 (r3) contains the address of | |
| 52 | * the structure where we are to | |
| 53 | * store the context | |
| 54 | * Uses r0 as scratch register | |
| 55 | * | |
| 56 | * NOTE : MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h | |
| 57 | * (which needs to know where to find the destination address) | |
| 58 | */ | |
| 59 | ||
| 60 | ENTRY(_setjmp,TAG_NO_FRAME_USED) | |
| 61 | /* first entry is used for r1 - stack ptr */ | |
| 62 | stw r13, 4(ARG0) /* GPR context. We avoid multiple-word */ | |
| 63 | stw r14, 8(ARG0) /* instructions as they're slower (?) */ | |
| 64 | stw r15, 12(ARG0) | |
| 65 | stw r16, 16(ARG0) | |
| 66 | stw r17, 20(ARG0) | |
| 67 | stw r18, 24(ARG0) | |
| 68 | stw r19, 28(ARG0) | |
| 69 | stw r20, 32(ARG0) | |
| 70 | stw r21, 36(ARG0) | |
| 71 | stw r22, 40(ARG0) | |
| 72 | stw r23, 44(ARG0) | |
| 73 | stw r24, 48(ARG0) | |
| 74 | stw r25, 52(ARG0) | |
| 75 | stw r26, 56(ARG0) | |
| 76 | stw r27, 60(ARG0) | |
| 77 | stw r28, 64(ARG0) | |
| 78 | stw r29, 68(ARG0) | |
| 79 | stw r30, 72(ARG0) | |
| 80 | stw r31, 76(ARG0) | |
| 81 | ||
| 82 | mfcr r0 | |
| 83 | stw r0, 80(ARG0) /* Condition register */ | |
| 84 | ||
| 85 | mflr r0 | |
| 86 | stw r0, 84(ARG0) /* Link register */ | |
| 87 | ||
| 88 | mfxer r0 | |
| 89 | stw r0, 88(ARG0) /* Fixed point exception register */ | |
| 90 | ||
| 91 | #if FLOATING_POINT_SUPPORT /* TODO NMGS probably not needed for kern */ | |
| 91447636 A |
92 | mffs f0 /* get FPSCR in low 32 bits of f0 */ |
| 93 | stfiwx f0, 92(ARG0) /* Floating point status register */ | |
| 1c79356b A |
94 | |
| 95 | stfd f14, 96(ARG0) /* Floating point context - 8 byte aligned */ | |
| 96 | stfd f15, 104(ARG0) | |
| 97 | stfd f16, 112(ARG0) | |
| 98 | stfd f17, 120(ARG0) | |
| 99 | stfd f18, 138(ARG0) | |
| 100 | stfd f19, 146(ARG0) | |
| 101 | stfd f20, 144(ARG0) | |
| 102 | stfd f21, 152(ARG0) | |
| 103 | stfd f22, 160(ARG0) | |
| 104 | stfd f23, 178(ARG0) | |
| 105 | stfd f24, 186(ARG0) | |
| 106 | stfd f25, 184(ARG0) | |
| 107 | stfd f26, 192(ARG0) | |
| 108 | stfd f27, 200(ARG0) | |
| 109 | stfd f28, 218(ARG0) | |
| 110 | stfd f29, 226(ARG0) | |
| 111 | stfd f30, 224(ARG0) | |
| 112 | stfd f31, 232(ARG0) | |
| 113 | ||
| 114 | #endif | |
| 115 | ||
| 116 | stw r1, 0(ARG0) /* finally, save the stack pointer */ | |
| 117 | li ARG0, 0 /* setjmp must return zero */ | |
| 118 | blr | |
| 119 | ||
| 120 | /* | |
| 121 | * longjmp : ARG0 (r3) contains the address of | |
| 122 | * the structure from where we are to | |
| 123 | * restore the context. | |
| 124 | * ARG1 (r4) contains the non-zero | |
| 125 | * value that we must return to | |
| 126 | * that context. | |
| 127 | * Uses r0 as scratch register | |
| 128 | * | |
| 129 | * NOTE : MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h | |
| 130 | * (which needs to know where to find the destination address) | |
| 131 | */ | |
| 132 | ||
| 133 | ENTRY(_longjmp, TAG_NO_FRAME_USED) /* TODO NMGS - need correct tag */ | |
| 134 | lwz r13, 4(ARG0) /* GPR context. We avoid multiple-word */ | |
| 135 | lwz r14, 8(ARG0) /* instructions as they're slower (?) */ | |
| 136 | lwz r15, 12(ARG0) | |
| 137 | lwz r16, 16(ARG0) | |
| 138 | lwz r17, 20(ARG0) | |
| 139 | lwz r18, 24(ARG0) | |
| 140 | lwz r19, 28(ARG0) | |
| 141 | lwz r20, 32(ARG0) | |
| 142 | lwz r21, 36(ARG0) | |
| 143 | lwz r22, 40(ARG0) | |
| 144 | lwz r23, 44(ARG0) | |
| 145 | lwz r24, 48(ARG0) | |
| 146 | lwz r25, 52(ARG0) | |
| 147 | lwz r26, 56(ARG0) | |
| 148 | lwz r27, 60(ARG0) | |
| 149 | lwz r28, 64(ARG0) | |
| 150 | lwz r29, 68(ARG0) | |
| 151 | lwz r30, 72(ARG0) | |
| 152 | lwz r31, 76(ARG0) | |
| 153 | ||
| 154 | lwz r0, 80(ARG0) /* Condition register */ | |
| 155 | mtcr r0 /* Use r5 as scratch register */ | |
| 156 | ||
| 157 | lwz r0, 84(ARG0) /* Link register */ | |
| 158 | mtlr r0 | |
| 159 | ||
| 160 | lwz r0, 88(ARG0) /* Fixed point exception register */ | |
| 161 | mtxer r0 | |
| 162 | ||
| 163 | #ifdef FLOATING_POINT_SUPPORT | |
| 91447636 A |
164 | lfd f0, 92-4(ARG0) /* get Floating point status register in low 32 bits of f0 */ |
| 165 | mtfsf 0xFF,f0 /* restore FPSCR */ | |
| 1c79356b A |
166 | |
| 167 | lfd f14, 96(ARG0) /* Floating point context - 8 byte aligned */ | |
| 168 | lfd f15, 104(ARG0) | |
| 169 | lfd f16, 112(ARG0) | |
| 170 | lfd f17, 120(ARG0) | |
| 171 | lfd f18, 128(ARG0) | |
| 172 | lfd f19, 136(ARG0) | |
| 173 | lfd f20, 144(ARG0) | |
| 174 | lfd f21, 152(ARG0) | |
| 175 | lfd f22, 160(ARG0) | |
| 176 | lfd f23, 168(ARG0) | |
| 177 | lfd f24, 176(ARG0) | |
| 178 | lfd f25, 184(ARG0) | |
| 179 | lfd f26, 192(ARG0) | |
| 180 | lfd f27, 200(ARG0) | |
| 181 | lfd f28, 208(ARG0) | |
| 182 | lfd f29, 216(ARG0) | |
| 183 | lfd f30, 224(ARG0) | |
| 184 | lfd f31, 232(ARG0) | |
| 185 | ||
| 186 | #endif /* FLOATING_POINT_SUPPORT */ | |
| 187 | ||
| 188 | ||
| 189 | lwz r1, 0(ARG0) /* finally, restore the stack pointer */ | |
| 190 | ||
| 191 | mr. ARG0, ARG1 /* set the return value */ | |
| 192 | bnelr /* return if non-zero */ | |
| 193 | ||
| 194 | li ARG0, 1 | |
| 195 | blr /* never return 0, return 1 instead */ | |
| 196 |