diff options
author | Joseph Myers <joseph@codesourcery.com> | 2012-07-01 13:08:59 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2012-07-01 13:08:59 +0000 |
commit | e84eabb3871c9b39e59323bf3f6b98c2ca9d1cd0 (patch) | |
tree | dff3f1b79454b518d15a7b9bbedeb57ff156bbe8 /ports/sysdeps/unix/sysv/linux/alpha/brk.S | |
parent | 75f0d3040a2c2de8842bfa7a09e11da1a73e17d0 (diff) | |
parent | e64ac02c24b43659048622714afdc92fedf561fa (diff) |
Merge glibc-ports into ports/ directory.glibc-2.16-ports-merge
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/alpha/brk.S')
-rw-r--r-- | ports/sysdeps/unix/sysv/linux/alpha/brk.S | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/alpha/brk.S b/ports/sysdeps/unix/sysv/linux/alpha/brk.S new file mode 100644 index 0000000000..cb759dbe9f --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/alpha/brk.S @@ -0,0 +1,84 @@ +/* Copyright (C) 1993-2012 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) |