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- /* Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Brendan Kehoe <brendan@zen.org>, 1993.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- /* __brk is a special syscall under Linux since it never returns an
- error. Instead, the error condition is indicated by returning the old
- break value (instead of the new, requested one). */
- #include <features.h>
- #define _ERRNO_H
- #include <bits/errno.h>
- #include <sys/syscall.h>
- #ifdef __PIC__
- .section .bss
- .align 3
- .globl __curbrk
- .hidden __curbrk
- __curbrk: .skip 8
- .type __curbrk,@object
- .size __curbrk,8
- #else
- .comm __curbrk, 8
- #endif
- .text
- .globl brk;
- .align 3;
- .ent brk , 0;
- brk:
- .frame $30 , 8 , $26
- ldgp $29, 0($27)
- subq $30, 8, $30
- .prologue 1
- /* Save the requested brk across the system call. */
- stq $16, 0($30)
- ldiq $0, __NR_brk
- call_pal 131
- ldq $16, 0($30)
- /* Be prepared for an OSF-style brk. */
- bne $19, $err1
- beq $0, $ok
- /* Correctly handle the brk(0) query case. */
- cmoveq $16, $0, $16
- xor $16, $0, $1
- bne $1, $err0
- /* Update __curbrk and return cleanly. */
- mov $31, $0
- $ok: stq $16, __curbrk
- addq $30, 8, $30
- ret
- /* What a horrible way to die. */
- $err0: ldi $0, ENOMEM
- $err1: addq $30, 8, $30
- jmp $31, __syscall_error
- .end brk
- libc_hidden_def(brk)
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