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106 lines
2.4 KiB
ArmAsm
106 lines
2.4 KiB
ArmAsm
/* Copyright (C) 1997-2017 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 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, see
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<http://www.gnu.org/licenses/>. */
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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, -192, %sp
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cfi_def_cfa_register(%fp)
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cfi_window_save
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cfi_register(%o7, %i7)
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#ifdef PIC
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SETUP_PIC_REG(l7)
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#endif
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LOADSYSCALL(brk)
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mov %i0, %o0
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ta 0x6d
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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,pt %i0, .Lok
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subcc %i0, %o0, %g0
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bne,pn %xcc, .Lerr0
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nop
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/* Update __curbrk and return cleanly. */
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.Lok:
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#ifndef PIC
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sethi %hi(__curbrk), %g1
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or %g1, %lo(__curbrk), %g1
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#else
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sethi %gdop_hix22(__curbrk), %g1
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xor %g1, %gdop_lox10(__curbrk), %g1
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ldx [%l7 + %g1], %g1, %gdop(__curbrk)
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#endif
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stx %o0, [%g1]
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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:
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#ifndef _LIBC_REENTRANT
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#ifndef PIC
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sethi %hi(errno), %g1
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or %g1, %lo(errno), %g1
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#else
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sethi %gdop_hix22(errno), %g1
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xor %g1, %gdop_lox10(errno), %g1
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ldx [%l7 + %g1], %g1, %gdop(errno)
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#endif
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st %o0, [%g1]
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#else
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#if IS_IN (libc)
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call HIDDEN_JUMPTARGET(__errno_location)
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#else
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call __errno_location
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#endif
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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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END (__brk)
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weak_alias (__brk, brk)
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