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83 lines
2.0 KiB
ArmAsm
83 lines
2.0 KiB
ArmAsm
/* Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Brendan Kehoe <brendan@zen.org>, 1993.
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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 not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, 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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#define _ERRNO_H
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#include <errnos.h>
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#ifdef PIC
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.section .bss
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.align 3
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.globl __curbrk
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__curbrk: .skip 8
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.type __curbrk,@object
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.size __curbrk,8
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#else
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.comm __curbrk, 8
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#endif
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.text
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LEAF(__brk, 8)
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ldgp gp, 0(t12)
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subq sp, 8, sp
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#ifdef PROF
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.set noat
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lda AT, _mcount
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jsr AT, (AT), _mcount
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.set at
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#endif
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.prologue 1
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/* Save the requested brk across the system call. */
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stq a0, 0(sp)
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ldiq v0, __NR_brk
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call_pal PAL_callsys
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ldq a0, 0(sp)
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/* Be prepared for an OSF-style brk. */
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bne a3, $err1
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beq v0, $ok
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/* Correctly handle the brk(0) query case. */
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cmoveq a0, v0, a0
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xor a0, v0, t0
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bne t0, $err0
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/* Update __curbrk and return cleanly. */
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mov zero, v0
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$ok: stq a0, __curbrk
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addq sp, 8, sp
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ret
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/* What a horrible way to die. */
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$err0: ldi v0, ENOMEM
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$err1: lda pv, __syscall_error
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addq sp, 8, sp
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jmp zero, (pv), __syscall_error
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END(__brk)
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weak_alias (__brk, brk)
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