| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* brk system call for Linux/Nios2. |
| 2 | Copyright (C) 1995, 1996, 2000 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 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. |
| 9 | |
| 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 |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, write to the Free |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 18 | 02111-1307 USA. */ |
| 19 | |
| 20 | #include <unistd.h> |
| 21 | #include <sys/syscall.h> |
| 22 | #include <errno.h> |
| 23 | |
| 24 | /* This must be initialized data because commons can't have aliases. */ |
| 25 | void *__curbrk attribute_hidden = 0; |
| 26 | |
| 27 | int brk (void *addr) |
| 28 | { |
| 29 | void *newbrk; |
| 30 | register int r2 __asm__("r2") = TRAP_ID_SYSCALL; |
| 31 | register int r3 __asm__("r3") = __NR_brk; |
| 32 | register void *r4 __asm__("r4") = addr; |
| 33 | |
| 34 | __asm__ __volatile__ ("trap\n\t" : "=r"(newbrk) : "0"(r2), "r"(r3), "r"(r4)); |
| 35 | |
| 36 | __curbrk = newbrk; |
| 37 | |
| 38 | if (newbrk < addr) { |
| 39 | __set_errno (ENOMEM); |
| 40 | return -1; |
| 41 | } |
| 42 | |
| 43 | return 0; |
| 44 | } |
| 45 | libc_hidden_def(brk) |