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authorEric Andersen <andersen@codepoet.org>2004-07-16 11:09:34 +0000
committerEric Andersen <andersen@codepoet.org>2004-07-16 11:09:34 +0000
commitc3d50a69839f8d80fc7244fde6e4a57e5e39dd36 (patch)
treec9e27baac7541384b806cce0845f28c1f59b5a2e /libc/sysdeps/linux/nios2/brk.c
parent3cf731bf40f153a73373798085d1f45a80b972d6 (diff)
Pete Popov writes:
Hi Erik, I'm not sure why the NIOS support is not in uClibc -- perhaps the patch was rejected or never submitted? In any case, I'm playing with some NIOS stuff and created this patch against 0.9.26. The work was done by Microtronix. I'm not sure who else contributed to it. It would be great to have the NIOS support available in uClibc so developers don't have to go searching for these bits. Pete
Diffstat (limited to 'libc/sysdeps/linux/nios2/brk.c')
-rw-r--r--libc/sysdeps/linux/nios2/brk.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/nios2/brk.c b/libc/sysdeps/linux/nios2/brk.c
new file mode 100644
index 000000000..3b81e7018
--- /dev/null
+++ b/libc/sysdeps/linux/nios2/brk.c
@@ -0,0 +1,46 @@
+/* brk system call for Linux/Nios2.
+ Copyright (C) 1995, 1996, 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ 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. */
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <errno.h>
+
+
+/* This must be initialized data because commons can't have aliases. */
+void *___brk_addr = 0;
+
+
+int brk (void *addr)
+{
+ void *newbrk;
+ register int r2 asm("r2") = TRAP_ID_SYSCALL;
+ register int r3 asm("r3") = __NR_brk;
+ register void *r4 asm("r4") = addr;
+
+ asm volatile ("trap\n\t" : "=r"(newbrk) : "0"(r2), "r"(r3), "r"(r4));
+
+ ___brk_addr = newbrk;
+
+ if (newbrk < addr) {
+ __set_errno (ENOMEM);
+ return -1;
+ }
+
+ return 0;
+}