| /* Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| #define __ASSEMBLY__ /* for kernel headers */ |
| #include <linux/sched.h> |
| #include <asm/signal.h> |
| #include <tcb-offsets.h> |
| |
| /* Clone the calling process, but without copying the whole address space. |
| The calling process is suspended until the new process exits or is |
| replaced by a call to `execve'. Return -1 for errors, 0 to the new process, |
| and the process ID of the new process to the old process. */ |
| |
| .text |
| ENTRY (__vfork) |
| { |
| addli r11, tp, PID_OFFSET /* Point at PID. */ |
| movei r13, 1 |
| } |
| { |
| LD4U r12, r11 /* Load the saved PID. */ |
| shli r13, r13, 31 /* Build 0x80000000. */ |
| } |
| sub r12, zero, r12 /* Negate it. */ |
| #ifndef PT_VFORK |
| CMOVEQZ r12, r12, r13 /* Replace zero pids. */ |
| #endif |
| ST4 r11, r12 /* Store the temporary PID. */ |
| |
| { |
| moveli r0, CLONE_VFORK | CLONE_VM | SIGCHLD |
| move r1, zero |
| } |
| { |
| move r2, zero |
| move r3, zero |
| } |
| moveli TREG_SYSCALL_NR_NAME, __NR_clone |
| swint1 |
| |
| BEQZ r0, 1f /* If we are the parent... */ |
| { |
| addli r11, tp, PID_OFFSET /* Point at PID. */ |
| movei r13, 1 |
| } |
| { |
| LD4U r12, r11 /* Load the saved PID. */ |
| shli r13, r13, 31 /* Build 0x80000000. */ |
| } |
| { |
| CMPEQ r13, r12, r12 /* Test for that value. */ |
| sub r12, zero, r12 /* Re-negate it. */ |
| } |
| #ifndef PT_VFORK |
| CMOVNEZ r12, r13, zero /* Replace zero pids. */ |
| #endif |
| ST4 r11, r12 /* Restore the PID. */ |
| 1: |
| BNEZ r1, 0f |
| jrp lr |
| PSEUDO_END (__vfork) |
| libc_hidden_def (__vfork) |
| |
| weak_alias (__vfork, vfork) |
