projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 63d143a2 CM |
1 | /* Copyright (C) 2011 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. | |
| 3 | Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. | |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| ab84e3ff PE |
16 | License along with the GNU C Library. If not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 63d143a2 CM |
18 | |
| 19 | #include <sysdep.h> | |
| 20 | #define __ASSEMBLY__ /* for kernel headers */ | |
| 21 | #include <linux/sched.h> | |
| 22 | #include <asm/signal.h> | |
| 23 | #include <tcb-offsets.h> | |
| 24 | ||
| 25 | /* Clone the calling process, but without copying the whole address space. | |
| 26 | The calling process is suspended until the new process exits or is | |
| 27 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, | |
| 28 | and the process ID of the new process to the old process. */ | |
| 29 | ||
| 30 | .text | |
| 31 | ENTRY (__vfork) | |
| 32 | { | |
| 33 | addli r11, tp, PID_OFFSET /* Point at PID. */ | |
| 34 | movei r13, 1 | |
| 35 | } | |
| 36 | { | |
| 37 | LD4U r12, r11 /* Load the saved PID. */ | |
| 38 | shli r13, r13, 31 /* Build 0x80000000. */ | |
| 39 | } | |
| 40 | sub r12, zero, r12 /* Negate it. */ | |
| 41 | #ifndef PT_VFORK | |
| 42 | CMOVEQZ r12, r12, r13 /* Replace zero pids. */ | |
| 43 | #endif | |
| 44 | ST4 r11, r12 /* Store the temporary PID. */ | |
| 45 | ||
| 46 | { | |
| 47 | moveli r0, CLONE_VFORK | CLONE_VM | SIGCHLD | |
| 48 | move r1, zero | |
| 49 | } | |
| 50 | { | |
| 51 | move r2, zero | |
| 52 | move r3, zero | |
| 53 | } | |
| 54 | moveli TREG_SYSCALL_NR_NAME, __NR_clone | |
| 55 | swint1 | |
| 56 | ||
| 57 | BEQZ r0, 1f /* If we are the parent... */ | |
| 58 | { | |
| 59 | addli r11, tp, PID_OFFSET /* Point at PID. */ | |
| 60 | movei r13, 1 | |
| 61 | } | |
| 62 | { | |
| 63 | LD4U r12, r11 /* Load the saved PID. */ | |
| 64 | shli r13, r13, 31 /* Build 0x80000000. */ | |
| 65 | } | |
| 66 | { | |
| 67 | CMPEQ r13, r12, r12 /* Test for that value. */ | |
| 68 | sub r12, zero, r12 /* Re-negate it. */ | |
| 69 | } | |
| 70 | #ifndef PT_VFORK | |
| 71 | CMOVNEZ r12, r13, zero /* Replace zero pids. */ | |
| 72 | #endif | |
| 73 | ST4 r11, r12 /* Restore the PID. */ | |
| 74 | 1: | |
| 75 | BNEZ r1, 0f | |
| 76 | jrp lr | |
| 77 | PSEUDO_END (__vfork) | |
| 78 | libc_hidden_def (__vfork) | |
| 79 | ||
| 80 | weak_alias (__vfork, vfork) |