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* sysdeps/alpha/tcb-offsets.sym (PID_OFFSET): New.

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* sysdeps/unix/sysv/linux/alpha/pt-vfork.S: Save/restore PID.
        * sysdeps/unix/sysv/linux/alpha/vfork.S: New file.
This commit is contained in:
Richard Henderson 2004-03-11 21:34:25 +00:00
parent b4d2a4238c
commit 76deb69747
3 changed files with 69 additions and 4 deletions
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1
sysdeps/alpha/nptl/tcb-offsets.sym
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@ -10,3 +10,4 @@
#if TLS_MULTIPLE_THREADS_IN_TCB
MULTIPLE_THREADS_OFFSET thread_offsetof (header.multiple_threads)
#endif
PID_OFFSET thread_offsetof (pid)

26
sysdeps/unix/sysv/linux/alpha/nptl/pt-vfork.S
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@ -1,4 +1,4 @@
/* Copyright (C) 2003 Free Software Foundation, Inc.
/* Copyright (C) 2003, 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
@ -16,10 +16,28 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep-cancel.h>
#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; \
/* Write back its negation, 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. */ \
negl a2, 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(__vfork, vfork, 0)
ret
PSEUDO_END (__vfork)
weak_alias (__vfork, vfork)

46
sysdeps/unix/sysv/linux/alpha/nptl/vfork.S Normal file
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@ -0,0 +1,46 @@
/* 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#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)
weak_alias (__vfork, vfork)