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author | Chris Metcalf <cmetcalf@tilera.com> | 2014-06-10 13:45:36 -0400 |
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committer | Chris Metcalf <cmetcalf@tilera.com> | 2014-06-10 14:10:17 -0400 |
commit | 2d0fc4dcfcc35cdc3756e548e354488d48e8e1e9 (patch) | |
tree | 2fb242a7c70842a4a502ba2a9ac56db880e15061 /sysdeps/unix/sysv/linux/tile/vfork.S | |
parent | 0570cfed7f46a6e71175e1e6fc52fa9b3f22e677 (diff) | |
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tile: move sysdeps/unix/sysv/linux/tile nptl files.
Diffstat (limited to 'sysdeps/unix/sysv/linux/tile/vfork.S')
-rw-r--r-- | sysdeps/unix/sysv/linux/tile/vfork.S | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tile/vfork.S b/sysdeps/unix/sysv/linux/tile/vfork.S new file mode 100644 index 0000000000..014cccf7e2 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tile/vfork.S @@ -0,0 +1,80 @@ +/* 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) |