projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 04277e02 | 1 | /* Copyright (C) 1993-2019 Free Software Foundation, Inc. |
| 3c7b2587 UD |
2 | This file is part of the GNU C Library. |
| 3 | Contributed by Brendan Kehoe <brendan@zen.org>, 1993. | |
| 6932e444 | 4 | |
| 3c7b2587 | 5 | The GNU C Library is free software; you can redistribute it and/or |
| 3214b89b AJ |
6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 6932e444 | 9 | |
| 3c7b2587 UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 3214b89b | 13 | Lesser General Public License for more details. |
| 6932e444 | 14 | |
| 3214b89b | 15 | You should have received a copy of the GNU Lesser General Public |
| ab84e3ff PE |
16 | License along with the GNU C Library. If not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 6932e444 RM |
18 | |
| 19 | /* __brk is a special syscall under Linux since it never returns an | |
| 3c7b2587 UD |
20 | error. Instead, the error condition is indicated by returning the old |
| 21 | break value (instead of the new, requested one). */ | |
| 6932e444 RM |
22 | |
| 23 | #include <sysdep.h> | |
| 05e86071 | 24 | #define _ERRNO_H |
| 405916ef | 25 | #include <bits/errno.h> |
| 6932e444 | 26 | |
| b870eeda 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 | |
| d6634820 | 35 | .comm __curbrk, 8 |
| b870eeda | 36 | #endif |
| 6932e444 RM |
37 | |
| 38 | .text | |
| 13488b2e RH |
39 | .align 4 |
| 40 | .globl __brk | |
| 41 | .ent __brk | |
| 42 | .usepv __brk, std | |
| 43 | ||
| 44 | cfi_startproc | |
| 45 | __brk: | |
| 6932e444 | 46 | ldgp gp, 0(t12) |
| 13488b2e RH |
47 | subq sp, 16, sp |
| 48 | cfi_adjust_cfa_offset (16) | |
| dd4b8913 | 49 | #ifdef PROF |
| 3c7b2587 | 50 | .set noat |
| dd4b8913 UD |
51 | lda AT, _mcount |
| 52 | jsr AT, (AT), _mcount | |
| 3c7b2587 | 53 | .set at |
| dd4b8913 | 54 | #endif |
| 6932e444 | 55 | |
| c0fda13c UD |
56 | /* Save the requested brk across the system call. */ |
| 57 | stq a0, 0(sp) | |
| 58 | ||
| 939caadf | 59 | ldiq v0, __NR_brk |
| 6932e444 | 60 | call_pal PAL_callsys |
| d6634820 | 61 | |
| c0fda13c | 62 | ldq a0, 0(sp) |
| 13488b2e RH |
63 | addq sp, 16, sp |
| 64 | cfi_adjust_cfa_offset (-16) | |
| c0fda13c | 65 | |
| 28c50ce9 | 66 | /* Be prepared for an OSF-style brk. */ |
| 13488b2e | 67 | bne a3, SYSCALL_ERROR_LABEL |
| 28c50ce9 UD |
68 | beq v0, $ok |
| 69 | ||
| d6634820 RM |
70 | /* Correctly handle the brk(0) query case. */ |
| 71 | cmoveq a0, v0, a0 | |
| 28c50ce9 | 72 | xor a0, v0, t0 |
| 13488b2e RH |
73 | lda v0, ENOMEM |
| 74 | bne t0, SYSCALL_ERROR_LABEL | |
| 6932e444 RM |
75 | |
| 76 | /* Update __curbrk and return cleanly. */ | |
| 13488b2e | 77 | lda v0, 0 |
| 28c50ce9 | 78 | $ok: stq a0, __curbrk |
| 6932e444 RM |
79 | ret |
| 80 | ||
| 13488b2e RH |
81 | PSEUDO_END(__brk) |
| 82 | cfi_endproc | |
| 6932e444 RM |
83 | |
| 84 | weak_alias (__brk, brk) |