diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/alpha/vfork.S')
-rw-r--r-- | sysdeps/unix/sysv/linux/alpha/vfork.S | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/alpha/vfork.S b/sysdeps/unix/sysv/linux/alpha/vfork.S new file mode 100644 index 0000000000..0507d3523e --- /dev/null +++ b/sysdeps/unix/sysv/linux/alpha/vfork.S @@ -0,0 +1,57 @@ +/* Copyright (C) 2004-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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> +#include <tcb-offsets.h> + +ENTRY(__vfork) + PSEUDO_PROLOGUE + + /* Load the thread pointer value in A1 across the vfork. */ + rduniq + mov v0, a1 + + /* Save the TCB-cached PID away in A2, and then negate the TCB + field. But if it's zero, set it to 0x80000000 instead. See + raise.c for the logic that relies on this value. */ + ldl a2, PID_OFFSET(v0) + ldah t0, -0x8000 + negl a2, t1 + cmovne a2, t1, t0 + stl t0, PID_OFFSET(v0); + + lda v0, SYS_ify(vfork) + call_pal PAL_callsys + + /* Restore the original value of the TCB cache of the PID, if we're + the parent. But in the child (syscall return value equals zero), + leave things as they are. */ + beq v0, 1f + stl a2, PID_OFFSET(a1) +1: + /* Normal error check and return. */ + bne a3, SYSCALL_ERROR_LABEL + ret + +PSEUDO_END (__vfork) +libc_hidden_def (__vfork) + +weak_alias (__vfork, vfork) + +#if !NOT_IN_libc +strong_alias (__vfork, __libc_vfork) +#endif |