| 1 | /* Copyright (C) 2005-2024 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library. If not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | /* vfork() is just a special case of clone(). */ |
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| 19 | |
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| 20 | #include <sys/asm.h> |
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| 21 | #include <sysdep.h> |
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| 22 | #include <sgidefs.h> |
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| 23 | #include <tls.h> |
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| 24 | |
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| 25 | |
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| 26 | /* int vfork() */ |
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| 27 | |
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| 28 | .text |
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| 29 | .set nomips16 |
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| 30 | LOCALSZ= 1 |
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| 31 | FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK |
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| 32 | GPOFF= FRAMESZ-(1*SZREG) |
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| 33 | NESTED(__libc_vfork,FRAMESZ,sp) |
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| 34 | #ifdef __PIC__ |
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| 35 | SETUP_GP |
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| 36 | #endif |
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| 37 | PTR_SUBU sp, FRAMESZ |
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| 38 | cfi_adjust_cfa_offset (FRAMESZ) |
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| 39 | SETUP_GP64_REG (a5, __libc_vfork) |
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| 40 | #ifdef __PIC__ |
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| 41 | SAVE_GP (GPOFF) |
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| 42 | #endif |
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| 43 | #ifdef PROF |
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| 44 | # if (_MIPS_SIM != _ABIO32) |
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| 45 | PTR_S a5, GPOFF(sp) |
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| 46 | # endif |
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| 47 | .set noat |
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| 48 | move $1, ra |
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| 49 | # if (_MIPS_SIM == _ABIO32) |
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| 50 | subu sp,sp,8 |
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| 51 | # endif |
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| 52 | jal _mcount |
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| 53 | .set at |
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| 54 | # if (_MIPS_SIM != _ABIO32) |
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| 55 | PTR_L a5, GPOFF(sp) |
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| 56 | # endif |
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| 57 | #endif |
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| 58 | |
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| 59 | PTR_ADDU sp, FRAMESZ |
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| 60 | cfi_adjust_cfa_offset (-FRAMESZ) |
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| 61 | |
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| 62 | li a0, 0x4112 /* CLONE_VM | CLONE_VFORK | SIGCHLD */ |
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| 63 | move a1, sp |
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| 64 | |
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| 65 | /* Do the system call */ |
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| 66 | li v0,__NR_clone |
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| 67 | syscall |
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| 68 | |
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| 69 | cfi_remember_state |
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| 70 | bnez a3,L(error) |
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| 71 | |
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| 72 | /* Successful return from the parent or child. */ |
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| 73 | RESTORE_GP64_REG |
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| 74 | ret |
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| 75 | |
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| 76 | /* Something bad happened -- no child created. */ |
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| 77 | L(error): |
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| 78 | cfi_restore_state |
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| 79 | #ifdef __PIC__ |
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| 80 | PTR_LA t9, __syscall_error |
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| 81 | RESTORE_GP64_REG |
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| 82 | jr t9 |
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| 83 | #else |
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| 84 | RESTORE_GP64_REG |
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| 85 | j __syscall_error |
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| 86 | #endif |
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| 87 | END(__libc_vfork) |
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| 88 | |
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| 89 | #if IS_IN (libc) |
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| 90 | weak_alias (__libc_vfork, vfork) |
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| 91 | strong_alias (__libc_vfork, __vfork) |
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| 92 | libc_hidden_def (__vfork) |
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| 93 | #endif |
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| 94 | |
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