projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 04277e02 | 1 | /* Copyright (C) 2005-2019 Free Software Foundation, Inc. |
| 4abf7dea AJ |
2 | This file is part of the GNU C Library. |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 5 | modify it under the terms of the GNU Lesser General Public | |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| 8 | ||
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | Lesser General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Lesser General Public | |
| ab84e3ff | 15 | License along with the GNU C Library. If not, see |
| 5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
| 4abf7dea AJ |
17 | |
| 18 | /* vfork() is just a special case of clone(). */ | |
| 19 | ||
| 20 | #include <sys/asm.h> | |
| 21 | #include <sysdep.h> | |
| 22 | #include <asm/unistd.h> | |
| 23 | #include <sgidefs.h> | |
| 58eb0862 | 24 | #include <tls.h> |
| 4abf7dea AJ |
25 | |
| 26 | ||
| 27 | /* int vfork() */ | |
| 28 | ||
| 29 | .text | |
| 43301bd3 | 30 | .set nomips16 |
| 4abf7dea AJ |
31 | LOCALSZ= 1 |
| 32 | FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK | |
| 33 | GPOFF= FRAMESZ-(1*SZREG) | |
| b87c1ec3 | 34 | NESTED(__libc_vfork,FRAMESZ,sp) |
| 4abf7dea AJ |
35 | #ifdef __PIC__ |
| 36 | SETUP_GP | |
| 37 | #endif | |
| 38 | PTR_SUBU sp, FRAMESZ | |
| aea7a9b9 | 39 | cfi_adjust_cfa_offset (FRAMESZ) |
| b87c1ec3 | 40 | SETUP_GP64_REG (a5, __libc_vfork) |
| 4abf7dea AJ |
41 | #ifdef __PIC__ |
| 42 | SAVE_GP (GPOFF) | |
| 43 | #endif | |
| 44 | #ifdef PROF | |
| 45 | # if (_MIPS_SIM != _ABIO32) | |
| 46 | PTR_S a5, GPOFF(sp) | |
| 47 | # endif | |
| 48 | .set noat | |
| 49 | move $1, ra | |
| 50 | # if (_MIPS_SIM == _ABIO32) | |
| 51 | subu sp,sp,8 | |
| 52 | # endif | |
| 53 | jal _mcount | |
| 54 | .set at | |
| 55 | # if (_MIPS_SIM != _ABIO32) | |
| 56 | PTR_L a5, GPOFF(sp) | |
| 57 | # endif | |
| 58 | #endif | |
| 59 | ||
| 60 | PTR_ADDU sp, FRAMESZ | |
| aea7a9b9 | 61 | cfi_adjust_cfa_offset (-FRAMESZ) |
| 4abf7dea | 62 | |
| 4abf7dea AJ |
63 | li a0, 0x4112 /* CLONE_VM | CLONE_VFORK | SIGCHLD */ |
| 64 | move a1, sp | |
| 65 | ||
| 66 | /* Do the system call */ | |
| 67 | li v0,__NR_clone | |
| 68 | syscall | |
| 69 | ||
| aea7a9b9 | 70 | cfi_remember_state |
| 4abf7dea AJ |
71 | bnez a3,L(error) |
| 72 | ||
| 73 | /* Successful return from the parent or child. */ | |
| aea7a9b9 | 74 | RESTORE_GP64_REG |
| 4abf7dea AJ |
75 | ret |
| 76 | ||
| 77 | /* Something bad happened -- no child created. */ | |
| 78 | L(error): | |
| aea7a9b9 | 79 | cfi_restore_state |
| 4abf7dea AJ |
80 | #ifdef __PIC__ |
| 81 | PTR_LA t9, __syscall_error | |
| aea7a9b9 | 82 | RESTORE_GP64_REG |
| 4abf7dea AJ |
83 | jr t9 |
| 84 | #else | |
| aea7a9b9 | 85 | RESTORE_GP64_REG |
| 4abf7dea AJ |
86 | j __syscall_error |
| 87 | #endif | |
| b87c1ec3 | 88 | END(__libc_vfork) |
| 4abf7dea | 89 | |
| 43c29487 | 90 | #if IS_IN (libc) |
| b87c1ec3 AJ |
91 | weak_alias (__libc_vfork, vfork) |
| 92 | strong_alias (__libc_vfork, __vfork) | |
| 93 | libc_hidden_def (__vfork) | |
| 43c29487 | 94 | #endif |