1 files changed, 77 insertions, 0 deletions
diff --git a/lib/libc/riscv/sys/sbrk.S b/lib/libc/riscv/sys/sbrk.S
new file mode 100644
index 0000000..1860a98
--- /dev/null
+++ b/lib/libc/riscv/sys/sbrk.S
@@ -0,0 +1,77 @@
+/*-
+ * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
+ * All rights reserved.
+ *
+ * Portions of this software were developed by SRI International and the
+ * University of Cambridge Computer Laboratory under DARPA/AFRL contract
+ * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * Portions of this software were developed by the University of Cambridge
+ * Computer Laboratory as part of the CTSRD Project, with support from the
+ * UK Higher Education Innovation Fund (HEIF).
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <machine/asm.h>
+__FBSDID("$FreeBSD$");
+
+#include "SYS.h"
+
+	.globl	_C_LABEL(_end)
+
+	.data
+	.align	3
+	.global	_C_LABEL(curbrk)
+	.type	_C_LABEL(curbrk), %object
+_C_LABEL(curbrk):
+	.quad	_C_LABEL(_end)
+
+	.text
+/*
+ * void *sbrk(intptr_t incr);
+ */
+ENTRY(_sbrk)
+	WEAK_REFERENCE(_sbrk, sbrk)
+
+	/* Load the address of curbrk */
+	la	a3, curbrk
+
+	/* Get the current brk address */
+	ld	a2, 0(a3)
+
+	/* Calculate the new value */
+	add	a0, a0, a2
+	mv	a4, a0
+
+	/* Update for this value, will overwrite a0 and a1 */
+	_SYSCALL(break)
+	bnez	t0, cerror
+
+	/* Load the old value to return */
+	ld	a0, 0(a3)
+
+	/* Store the new curbrk value */
+	sd	a4, 0(a3)
+
+	ret
+END(_sbrk)