Make sbrk common, add arm/brk.c, cleanup leftover damage

2 files changed, 48 insertions, 1 deletions

diff --git a/libc/sysdeps/linux/arm/Makefile b/libc/sysdeps/linux/arm/Makefile
index 539e4d692..9e826aa48 100644
--- a/libc/sysdeps/linux/arm/Makefile
+++ b/libc/sysdeps/linux/arm/Makefile
@@ -33,7 +33,7 @@ CRT0_OBJ=crt0.o
 SSRC=longjmp.S setjmp.S vfork.S
 SOBJS=$(patsubst %.S,%.o, $(SSRC))
 
-CSRC=inout_bwl.c
+CSRC=inout_bwl.c brk.c
 COBJS=$(patsubst %.c,%.o, $(CSRC))
 
 OBJS=$(SOBJS) $(MOBJ) $(COBJS)
diff --git a/libc/sysdeps/linux/arm/brk.c b/libc/sysdeps/linux/arm/brk.c
new file mode 100644
index 000000000..0262aa110
--- /dev/null
+++ b/libc/sysdeps/linux/arm/brk.c
@@ -0,0 +1,47 @@
+/* brk system call for Linux/ARM.
+   Copyright (C) 1995, 1996 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 <errno.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+/* This must be initialized data because commons can't have aliases.  */
+void *___brk_addr = 0;
+
+int brk (void *addr)
+{
+    void *newbrk;
+
+    asm ("mov a1, %1\n"	/* save the argment in r0 */
+	    "swi %2\n"	/* do the system call */
+	    "mov %0, a1;"	/* keep the return value */
+	    : "=r"(newbrk) 
+	    : "r"(addr), "i" (__NR_brk)
+	    : "a1");
+
+    ___brk_addr = newbrk;
+
+    if (newbrk < addr)
+    {
+	__set_errno (ENOMEM);
+	return -1;
+    }
+
+    return 0;
+}