diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/alpha/nptl/vfork.S')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/alpha/nptl/vfork.S | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/alpha/nptl/vfork.S b/ports/sysdeps/unix/sysv/linux/alpha/nptl/vfork.S new file mode 100644 index 0000000000..9695c6d289 --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/alpha/nptl/vfork.S @@ -0,0 +1,45 @@ +/* Copyright (C) 2004 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> + +#undef PSEUDO_PREPARE_ARGS +#define PSEUDO_PREPARE_ARGS \ + /* Load the current cached pid value across the vfork. */ \ + rduniq; \ + ldl a2, PID_OFFSET(v0); \ + mov v0, a1; \ + /* If the cached value is initialized (nonzero), then write \ + back its negation, or INT_MIN, to indicate that the pid \ + value is uninitialized in the the child, and in the window \ + between here and the point at which we restore the value. */ \ + ldah t0, -0x8000; \ + negl a2, t1; \ + cmovne a2, t1, t0; \ + stl t0, PID_OFFSET(v0); + +PSEUDO (__vfork, vfork, 0) + + /* If we're back in the parent, restore the saved pid. */ + beq v0, 1f + stl a2, PID_OFFSET(a1) +1: ret + +PSEUDO_END (__vfork) +libc_hidden_def (__vfork) +weak_alias (__vfork, vfork) |