projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| a5113b14 | 1 | /* Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc. |
| b20e47cb RM |
2 | Contributed by Brendan Kehoe (brendan@zen.org). |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 5 | modify it under the terms of the GNU Library General Public License as | |
| 6 | published by the Free Software Foundation; either version 2 of the | |
| 7 | License, or (at your option) any later version. | |
| 8 | ||
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | Library General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Library General Public | |
| 15 | License along with the GNU C Library; see the file COPYING.LIB. If | |
| 16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
| 17 | Cambridge, MA 02139, USA. */ | |
| 18 | ||
| 19 | /* __brk is a special syscall under Linux since it never returns an | |
| 20 | error. Instead, the error condition is indicated by returning the old | |
| 21 | break value (instead of the new, requested one). */ | |
| 22 | ||
| 23 | #include <sysdep.h> | |
| 1f64ac13 | 24 | #define _ERRNO_H |
| b20e47cb RM |
25 | #include <errnos.h> |
| 26 | ||
| a5113b14 UD |
27 | #ifdef PIC |
| 28 | .section .bss | |
| 29 | .align 3 | |
| 30 | .globl __curbrk | |
| 31 | __curbrk: .skip 8 | |
| 32 | .type __curbrk,@object | |
| 33 | .size __curbrk,8 | |
| 34 | #else | |
| 84724245 | 35 | .comm __curbrk, 8 |
| a5113b14 | 36 | #endif |
| b20e47cb RM |
37 | |
| 38 | .text | |
| 510ca033 | 39 | LEAF(__brk, 0) |
| b20e47cb | 40 | ldgp gp, 0(t12) |
| b5791037 UD |
41 | #ifdef PROF |
| 42 | lda AT, _mcount | |
| 43 | jsr AT, (AT), _mcount | |
| 44 | #endif | |
| b20e47cb RM |
45 | .prologue 1 |
| 46 | ||
| a1470b6f | 47 | ldiq v0, __NR_brk |
| b20e47cb | 48 | call_pal PAL_callsys |
| 84724245 RM |
49 | |
| 50 | /* Correctly handle the brk(0) query case. */ | |
| 51 | cmoveq a0, v0, a0 | |
| 52 | ||
| b20e47cb | 53 | subq a0, v0, t0 |
| 510ca033 | 54 | bne t0, error |
| b20e47cb RM |
55 | |
| 56 | /* Update __curbrk and return cleanly. */ | |
| 84724245 | 57 | stq a0, __curbrk |
| 510ca033 | 58 | mov zero, v0 |
| b20e47cb RM |
59 | ret |
| 60 | ||
| 61 | /* What a horrible way to die. */ | |
| 62 | error: ldi v0, ENOMEM | |
| a1470b6f | 63 | jmp zero, __syscall_error |
| b20e47cb | 64 | |
| 84724245 | 65 | END(__brk) |
| b20e47cb RM |
66 | |
| 67 | weak_alias (__brk, brk) |