| /* Copyright (C) 1997, 2008 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997. |
| |
| 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 <sysdep.h> |
| #define _ERRNO_H |
| #include <bits/errno.h> |
| |
| #ifdef PIC |
| .section .bss |
| .align 8 |
| .globl __curbrk |
| __curbrk: .skip 8 |
| .type __curbrk,@object |
| .size __curbrk,8 |
| #else |
| .common __curbrk, 8, 8 |
| #endif |
| |
| .text |
| ENTRY (__brk) |
| save %sp, -192, %sp |
| cfi_def_cfa_register(%fp) |
| cfi_window_save |
| cfi_register(%o7, %i7) |
| #ifdef PIC |
| 1: call 2f |
| sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7 |
| 2: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7 |
| add %l7, %o7, %l7 |
| #endif |
| |
| LOADSYSCALL(brk) |
| mov %i0, %o0 |
| |
| ta 0x6d |
| |
| /* All the ways we can fail... */ |
| bcs,pn %xcc, .Lerr1 |
| nop |
| brz,pt %i0, .Lok |
| subcc %i0, %o0, %g0 |
| bne,pn %xcc, .Lerr0 |
| nop |
| |
| /* Update __curbrk and return cleanly. */ |
| .Lok: sethi %hi(__curbrk), %g1 |
| or %g1, %lo(__curbrk), %g1 |
| #ifdef PIC |
| ldx [%l7+%g1], %g1 |
| #endif |
| stx %o0, [%g1] |
| mov %g0, %i0 |
| |
| /* Don't use "ret" cause the preprocessor will eat it. */ |
| jmpl %i7+8, %g0 |
| restore |
| |
| /* What a horrible way to die. */ |
| .Lerr0: set ENOMEM, %o0 |
| .Lerr1: |
| #ifndef _LIBC_REENTRANT |
| sethi %hi(errno), %g1 |
| or %g1, %lo(errno), %g1 |
| #ifdef PIC |
| ldx [%l7+%g1], %g1 |
| #endif |
| st %o0, [%g1] |
| #else |
| #ifndef NOT_IN_libc |
| call HIDDEN_JUMPTARGET(__errno_location) |
| #else |
| call __errno_location |
| #endif |
| mov %o0,%l1 |
| st %l1, [%o0] |
| #endif |
| sub %g0, 1, %i0 |
| jmpl %i7+8, %g0 |
| restore |
| END (__brk) |
| |
| weak_alias (__brk, brk) |
