projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| e9ce8d39 A |
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/setjmp.s | |
| 27 | * | |
| 28 | * Implements sigsetjmp(), setjmp(), _setjmp() | |
| 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 | 44 | #include "SYS.h" |
| e9ce8d39 A |
45 | #include "_setjmp.h" |
| 46 | ||
| 47 | /* | |
| 48 | * setjmp routines | |
| 49 | */ | |
| 50 | ||
| 51 | /* int sigsetjmp(sigjmp_buf env, int savemask); */ | |
| 52 | ||
| 59e0d9fe | 53 | MI_ENTRY_POINT(_sigsetjmp) |
| 224c7076 | 54 | cmpgi cr1,r4,0 ; this changes cr1 which is volatile |
| 59e0d9fe A |
55 | stg r4, JMP_SIGFLAG(r3) ; save the sigflag for use by siglongjmp() |
| 56 | beq-- cr1, L__exit ; if r4 == 0 do _setjmp() | |
| e9ce8d39 A |
57 | ; else *** fall through *** to setjmp() |
| 58 | ||
| 59 | /* int setjmp(jmp_buf env); */ | |
| 60 | ||
| 59e0d9fe A |
61 | MI_ENTRY_POINT(_setjmp) |
| 62 | mflr r0 | |
| 63 | stg r31, JMP_r31(r3) | |
| 64 | stg r0, JMP_lr(r3) | |
| 224c7076 A |
65 | mr r31, r3 ; save ptr to jmpbuf across calls |
| 66 | ||
| 67 | /* call sigprocmask() to get signal mask */ | |
| 68 | ||
| 69 | li r3, 1 ; get the previous signal mask | |
| 59e0d9fe A |
70 | li r4, 0 |
| 71 | la r5, JMP_sig(r31) ; get address where previous mask needs to be | |
| 224c7076 A |
72 | MI_CALL_EXTERNAL(_sigprocmask) ; make a syscall to get mask |
| 73 | ||
| 74 | /* call sigaltstack() to get SS_ONSTACK flag */ | |
| 75 | ||
| 76 | li r3,0 ; ss is NULL | |
| 77 | la r4,JMP_vr_base_addr(r31); oss is a temp buffer in jmp_buf | |
| 78 | MI_CALL_EXTERNAL(_sigaltstack) ; make a syscall to get current stack state | |
| 79 | la r4,JMP_vr_base_addr(r31); recreate temp buffer ptr | |
| 80 | lwz r5,2*GPR_BYTES(r4) ; get ss_flags (an int) from stack_t | |
| 81 | stw r5,JMP_ss_flags(r31) ; save ss_flags in jmp_buf | |
| 82 | ||
| 83 | mr r3, r31 ; restore jmp_buf ptr | |
| 59e0d9fe A |
84 | lg r0, JMP_lr(r31) |
| 85 | lg r31, JMP_r31(r31) | |
| 86 | mtlr r0 | |
| 87 | L__exit: | |
| 88 | MI_BRANCH_EXTERNAL(__setjmp) |