projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| f7a9f785 | 1 | /* Copyright (C) 2004-2016 Free Software Foundation, Inc. |
| 76deb697 RH |
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 PE |
15 | License along with the GNU C Library. If not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
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17 | |
| 18 | #include <sysdep.h> | |
| 19 | #include <tcb-offsets.h> | |
| 20 | ||
| 82aab97c | 21 | ENTRY(__libc_vfork) |
| e2fa4bc2 RH |
22 | PSEUDO_PROLOGUE |
| 23 | ||
| 24 | /* Load the thread pointer value in A1 across the vfork. */ | |
| 25 | rduniq | |
| 26 | mov v0, a1 | |
| 27 | ||
| 28 | /* Save the TCB-cached PID away in A2, and then negate the TCB | |
| 29 | field. But if it's zero, set it to 0x80000000 instead. See | |
| 30 | raise.c for the logic that relies on this value. */ | |
| 31 | ldl a2, PID_OFFSET(v0) | |
| 32 | ldah t0, -0x8000 | |
| 33 | negl a2, t1 | |
| 34 | cmovne a2, t1, t0 | |
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35 | stl t0, PID_OFFSET(v0); |
| 36 | ||
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37 | lda v0, SYS_ify(vfork) |
| 38 | call_pal PAL_callsys | |
| 76deb697 | 39 | |
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40 | /* Restore the original value of the TCB cache of the PID, if we're |
| 41 | the parent. But in the child (syscall return value equals zero), | |
| 42 | leave things as they are. */ | |
| 76deb697 RH |
43 | beq v0, 1f |
| 44 | stl a2, PID_OFFSET(a1) | |
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45 | 1: |
| 46 | /* Normal error check and return. */ | |
| 47 | bne a3, SYSCALL_ERROR_LABEL | |
| 48 | ret | |
| 76deb697 | 49 | |
| 82aab97c | 50 | PSEUDO_END (__libc_vfork) |
| e2fa4bc2 | 51 | |
| 4f41c682 | 52 | #if IS_IN (libc) |
| 82aab97c RH |
53 | weak_alias (__libc_vfork, vfork) |
| 54 | strong_alias (__libc_vfork, __vfork) | |
| 55 | libc_hidden_def (__vfork) | |
| e2fa4bc2 | 56 | #endif |