diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/alpha/brk.S')
-rw-r--r-- | sysdeps/unix/sysv/linux/alpha/brk.S | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/alpha/brk.S b/sysdeps/unix/sysv/linux/alpha/brk.S new file mode 100644 index 0000000..afd2e32 --- /dev/null +++ b/sysdeps/unix/sysv/linux/alpha/brk.S @@ -0,0 +1,60 @@ +/* Copyright (C) 1993, 1995 Free Software Foundation, Inc. + Contributed by Brendan Kehoe (brendan@zen.org). + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, 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 <sysdep.h> +#include <errnos.h> + +#ifndef HAVE_GNU_LD +#define _end end +#endif + + .extern _end,8 + + .data + + .globl __curbrk +__curbrk: + .quad _end + + .text +ENTRY(__brk) + ldgp gp, 0(t12) + .prologue 1 + + ldi v0, __NR_brk + call_pal PAL_callsys + subq a0, v0, t0 + bne t0, error + + /* Update __curbrk and return cleanly. */ + stl a0, __curbrk + mov zero, v0 + ret + + /* What a horrible way to die. */ +error: ldi v0, ENOMEM + lda pv, syscall_error + jmp zero,(pv) + + .end __brk + +weak_alias (__brk, brk) |