projects / apple / libc.git / blame
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|---|---|---|
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1 | /* |
| 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 734aad71 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. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 12 | * | |
| 13 | * The Original Code and all software distributed under the License are | |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| e9ce8d39 A |
15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 734aad71 A |
17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| e9ce8d39 A |
20 | * |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | /* | |
| 24 | * Copyright (c) 1998 Apple Computer, Inc. All rights reserved. | |
| 25 | * | |
| 26 | * File: sys/ppc/longjmp.s | |
| 27 | * | |
| 28 | * Implements siglongjmp(), longjmp(), _longjmp() | |
| 29 | * | |
| 30 | * NOTE: Scatterloading this file will BREAK the functions. | |
| 31 | * | |
| 32 | * History: | |
| 33 | * 30-Aug-1998 Umesh Vaishampayan (umeshv@apple.com) | |
| 34 | * Created. Derived from _setjmp.s, setjmp.c and setjmp.s | |
| 35 | */ | |
| 36 | ||
| 59e0d9fe A |
37 | /* We use mode-independent "g" opcodes such as "stg", and/or |
| 38 | * mode-independent macros such as MI_GET_ADDRESS. These expand | |
| 39 | * into word operations when targeting __ppc__, and into doubleword | |
| 40 | * operations when targeting __ppc64__. | |
| 41 | */ | |
| 42 | #include <architecture/ppc/mode_independent_asm.h> | |
| 43 | ||
| e9ce8d39 A |
44 | #include "_setjmp.h" |
| 45 | ||
| 46 | /* | |
| 47 | * longjmp routines | |
| 48 | */ | |
| 49 | ||
| 50 | /* void siglongjmp(sigjmp_buf env, int val); */ | |
| 51 | ||
| 59e0d9fe A |
52 | MI_ENTRY_POINT(_siglongjmp) |
| 53 | lg r0, JMP_SIGFLAG(r3) ; load sigflag saved by siglongjmp() | |
| 54 | cmpgi cr1,r0,0 ; this changes cr1 which is volatile | |
| 224c7076 A |
55 | mr r30, r3 ; preserve args across _sigsetmask |
| 56 | mr r31, r4 | |
| 59e0d9fe | 57 | beq-- cr1, L__exit ; if r0 == 0 do _longjmp() |
| e9ce8d39 A |
58 | ; else *** fall through *** to longjmp() |
| 59 | ||
| 60 | /* void longjmp(jmp_buf env, int val); */ | |
| 61 | ||
| 59e0d9fe A |
62 | MI_ENTRY_POINT(_longjmp) |
| 63 | mr r30, r3 ; preserve args across _sigsetmask | |
| 224c7076 A |
64 | mr r31, r4 |
| 65 | ||
| 59e0d9fe A |
66 | /* NB: this code assumes the signal mask is an int. Change the "lwz" below |
| 67 | * if not. The JMP_sig field is already 8 bytes in the jmpbuf. | |
| 68 | */ | |
| 69 | lwz r3, JMP_sig(r3) ; restore the signal mask | |
| 70 | MI_CALL_EXTERNAL(_sigsetmask) // make a (deprecated!) syscall to set the mask | |
| 224c7076 A |
71 | L__exit: |
| 72 | lwz r3,JMP_ss_flags(r30) | |
| 73 | MI_CALL_EXTERNAL(__sigunaltstack) | |
| 74 | L__exit2: | |
| 59e0d9fe | 75 | mr r3, r30 |
| 224c7076 | 76 | mr r4, r31 |
| 59e0d9fe | 77 | MI_BRANCH_EXTERNAL(__longjmp) |
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78 | |
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