mirror of git://sourceware.org/git/glibc.git
98 lines
2.3 KiB
ArmAsm
98 lines
2.3 KiB
ArmAsm
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/* Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997.
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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 <bits/errno.h>
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#ifdef PIC
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.section .bss
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.align 8
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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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.common __curbrk, 8, 8
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#endif
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.text
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ENTRY(__brk)
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save %sp, -160, %sp
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#ifdef PIC
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1: rd %pc, %g1
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sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7
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or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7
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add %l7, %g1, %l7
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#endif
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LOADSYSCALL(brk)
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mov %i0, %o0
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ta 0x11
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/* All the ways we can fail... */
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bcs,pn %xcc, .Lerr1
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nop
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brz %i0, .Lok
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subcc %i0, %o0, %g0
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bne,pn %xcc, .Lerr0
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/* Update __curbrk and return cleanly. */
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.Lok: sethi %hi(__curbrk), %g1
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or %g1, %lo(__curbrk), %g1
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#ifdef PIC
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ldx [%l7+%g1], %g1
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stx %o0, [%g1]
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#else
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stx %o0, [%g4+%g1]
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#endif
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mov %g0, %i0
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/* Don't use "ret" cause the preprocessor will eat it. */
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jmpl %i7+8, %g0
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restore
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/* What a horrible way to die. */
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.Lerr0: set ENOMEM, %o0
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.Lerr1: sethi %hi(errno), %g1
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or %g1, %lo(errno), %g1
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#ifdef PIC
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ldx [%l7+%g1], %g1
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st %o0, [%g1]
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#else
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st %o0, [%g4+%g1]
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#endif
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#ifdef _LIBC_REENTRANT
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call __errno_location
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mov %o0,%l1
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st %l1, [%o0]
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#endif
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sub %g0, 1, %i0
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jmpl %i7+8, %g0
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restore
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.size __brk, .-__brk
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weak_alias (__brk, brk)
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