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* sysdeps/unix/bsd/osf/alpha/brk.S, sysdeps/unix/sysv/linux/alpha/brk.S (__curbrk): Store the entire break value, not just the low 32 bits to accomodate large memories. Tue May 28 10:46:04 1996 Richard Henderson <rth@tamu.edu> * sysdeps/unix/sysv/linux/alpha/brk.S: Rather than attempt to dynamically resolve _end for initializing __curbrk, support the brk(0) query idiom.
54 lines
1.5 KiB
ArmAsm
54 lines
1.5 KiB
ArmAsm
/* Copyright (C) 1993, 1995 Free Software Foundation, Inc.
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Contributed by Brendan Kehoe (brendan@zen.org).
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/* __brk is a special syscall under Linux since it never returns an
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error. Instead, the error condition is indicated by returning the old
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break value (instead of the new, requested one). */
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#include <sysdep.h>
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#include <errnos.h>
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.comm __curbrk, 8
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.text
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LEAF(__brk, 0)
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ldgp gp, 0(t12)
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.prologue 1
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ldi v0, __NR_brk
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call_pal PAL_callsys
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/* Correctly handle the brk(0) query case. */
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cmoveq a0, v0, a0
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subq a0, v0, t0
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bne t0, error
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/* Update __curbrk and return cleanly. */
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stq a0, __curbrk
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mov zero, v0
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ret
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/* What a horrible way to die. */
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error: ldi v0, ENOMEM
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jmp zero, syscall_error
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END(__brk)
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weak_alias (__brk, brk)
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