| /* Copyright (C) 1993-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* __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 <sysdep.h> |
| #define _ERRNO_H |
| #include <bits/errno.h> |
| |
| #ifdef PIC |
| .section .bss |
| .align 3 |
| .globl __curbrk |
| __curbrk: .skip 8 |
| .type __curbrk,@object |
| .size __curbrk,8 |
| #else |
| .comm __curbrk, 8 |
| #endif |
| |
| .text |
| .align 4 |
| .globl __brk |
| .ent __brk |
| .usepv __brk, std |
| |
| cfi_startproc |
| __brk: |
| ldgp gp, 0(t12) |
| subq sp, 16, sp |
| cfi_adjust_cfa_offset (16) |
| #ifdef PROF |
| .set noat |
| lda AT, _mcount |
| jsr AT, (AT), _mcount |
| .set at |
| #endif |
| |
| /* Save the requested brk across the system call. */ |
| stq a0, 0(sp) |
| |
| ldiq v0, __NR_brk |
| call_pal PAL_callsys |
| |
| ldq a0, 0(sp) |
| addq sp, 16, sp |
| cfi_adjust_cfa_offset (-16) |
| |
| /* Be prepared for an OSF-style brk. */ |
| bne a3, SYSCALL_ERROR_LABEL |
| beq v0, $ok |
| |
| /* Correctly handle the brk(0) query case. */ |
| cmoveq a0, v0, a0 |
| xor a0, v0, t0 |
| lda v0, ENOMEM |
| bne t0, SYSCALL_ERROR_LABEL |
| |
| /* Update __curbrk and return cleanly. */ |
| lda v0, 0 |
| $ok: stq a0, __curbrk |
| ret |
| |
| PSEUDO_END(__brk) |
| cfi_endproc |
| |
| weak_alias (__brk, brk) |
