projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 8e029c65 A |
1 | /* |
| 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_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. 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 | |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 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. | |
| 20 | * | |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | /* | |
| 24 | * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved | |
| 25 | */ | |
| 26 | /* | |
| 27 | * NeXT 386 setjmp/longjmp | |
| 28 | * | |
| 29 | * Written by Bruce Martin, NeXT Inc. 4/9/92 | |
| 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 value of the signal mask is | |
| 41 | * restored. | |
| 42 | * | |
| 43 | */ | |
| 44 | ||
| 45 | #include <architecture/i386/asm_help.h> | |
| 46 | #include <SYS.h> | |
| 47 | ||
| 48 | #define JB_RBX 0 | |
| 49 | #define JB_RBP 8 | |
| 50 | #define JB_RSP 16 | |
| 51 | #define JB_R12 24 | |
| 52 | #define JB_R13 32 | |
| 53 | #define JB_R14 40 | |
| 54 | #define JB_R15 48 | |
| 55 | #define JB_RIP 56 | |
| 56 | #define JB_RFLAGS 64 | |
| 57 | #define JB_MXCSR 72 | |
| 58 | #define JB_FPCONTROL 76 | |
| 59 | #define JB_MASK 80 | |
| 60 | #define JB_SAVEMASK 84 // sigsetjmp/siglongjmp only | |
| 61 | ||
| 62 | ||
| 63 | LEAF(_sigsetjmp, 0) | |
| 64 | // %rdi is sigjmp_buf * jmpbuf; | |
| 65 | // %esi is int savemask | |
| 66 | movl %esi, JB_SAVEMASK(%rdi) // jmpbuf[_JBLEN] = savemask; | |
| 67 | cmpl $0, %esi // if savemask != 0 | |
| 68 | jne _setjmp // setjmp(jmpbuf); | |
| 69 | jmp L_do__setjmp // else _setjmp(jmpbuf); | |
| 70 | ||
| 71 | LEAF(_setjmp, 0) | |
| 72 | pushq %rdi // Preserve the jmp_buf across the call | |
| 73 | movl $1, %edi // how = SIG_BLOCK | |
| 74 | xorq %rsi, %rsi // set = NULL | |
| 75 | subq $8, %rsp // Allocate space for the return from sigprocmask | |
| 76 | movq %rsp, %rdx | |
| 77 | CALL_EXTERN(_sigprocmask) | |
| 78 | popq %rax // Save the mask | |
| 79 | popq %rdi // jmp_buf (struct sigcontext *) | |
| 80 | movq %rax, JB_MASK(%rdi) | |
| 81 | L_do__setjmp: | |
| 82 | BRANCH_EXTERN(__setjmp) | |
| 83 | ||
| 84 | LEAF(_siglongjmp, 0) | |
| 85 | // %rdi is sigjmp_buf * jmpbuf; | |
| 86 | cmpl $0, JB_SAVEMASK(%rdi) // if jmpbuf[_JBLEN] != 0 | |
| 87 | jne _longjmp // longjmp(jmpbuf, var); | |
| 88 | jmp L_do__longjmp // else _longjmp(jmpbuf, var); | |
| 89 | ||
| 90 | LEAF(_longjmp, 0) | |
| 91 | // %rdi is address of jmp_buf (saved context) | |
| 92 | pushq %rdi // Preserve the jmp_buf across the call | |
| 93 | pushq %rsi // Preserve the value across the call | |
| 94 | pushq JB_MASK(%rdi) // Put the mask on the stack | |
| 95 | movq $3, %rdi // how = SIG_SETMASK | |
| 96 | movq %rsp, %rsi // set = address where we stored the mask | |
| 97 | xorq %rdx, %rdx // oset = NULL | |
| 98 | CALL_EXTERN_AGAIN(_sigprocmask) | |
| 99 | addq $8, %rsp | |
| 100 | popq %rsi // Restore the value | |
| 101 | popq %rdi // Restore the jmp_buf | |
| 102 | L_do__longjmp: | |
| 103 | BRANCH_EXTERN(__longjmp) // else | |
| 104 | END(_longjmp) |