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2004-03-11 Richard Henderson <rth@redhat.com> * sysdeps/alpha/tcb-offsets.sym (PID_OFFSET): New. * sysdeps/unix/sysv/linux/alpha/pt-vfork.S: Save/restore PID. * sysdeps/unix/sysv/linux/alpha/vfork.S: New file.
47 lines
1.6 KiB
ArmAsm
47 lines
1.6 KiB
ArmAsm
/* Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include <tcb-offsets.h>
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#undef PSEUDO_PREPARE_ARGS
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#define PSEUDO_PREPARE_ARGS \
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/* Load the current cached pid value across the vfork. */ \
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rduniq; \
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ldl a2, PID_OFFSET(v0); \
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mov v0, a1; \
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/* If the cached value is initialized (nonzero), then write \
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back its negation, or INT_MIN, to indicate that the pid \
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value is uninitialized in the the child, and in the window \
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between here and the point at which we restore the value. */ \
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ldah t0, -0x8000; \
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negl a2, t1; \
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cmovne a2, t1, t0; \
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stl t0, PID_OFFSET(v0);
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PSEUDO (__vfork, vfork, 0)
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/* If we're back in the parent, restore the saved pid. */
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beq v0, 1f
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stl a2, PID_OFFSET(a1)
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1: ret
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PSEUDO_END (__vfork)
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weak_alias (__vfork, vfork)
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