create arch-generic brk() based on blackfin one

libc/sysdeps/linux/bfin/Makefile.arch

@@ -5,7 +5,7 @@
 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 #
 
-CSRC := brk.c bsdsetjmp.c clone.c syscall.c \
+CSRC := bsdsetjmp.c clone.c syscall.c \
 	sram-alloc.c sram-free.c dma-memcpy.c
 
 SSRC := __longjmp.S setjmp.S bsd-_setjmp.S vfork.S

libc/sysdeps/linux/bfin/brk.c → libc/sysdeps/linux/common/brk.c

@@ -8,29 +8,25 @@
 #include <unistd.h>
 #include <sys/syscall.h>
 
-/* libc_hidden_proto(brk) */
+libc_hidden_proto(brk)
+
+#define __NR___syscall_brk __NR_brk
+static inline _syscall1(void *, __syscall_brk, void *, end)
 
 /* This must be initialized data because commons can't have aliases.  */
 void * __curbrk attribute_hidden = 0;
 
-int brk (void *addr)
+int brk(void *addr)
 {
-    void *newbrk;
-
-	__asm__ __volatile__(
-		"P0 = %2;\n\t"
-		"excpt 0;\n\t"
-		: "=q0" (newbrk)
-		: "q0" (addr), "i" (__NR_brk): "P0" );
+	void *newbrk = __syscall_brk(addr);
 
-    __curbrk = newbrk;
+	__curbrk = newbrk;
 
-    if (newbrk < addr)
-    {
-	__set_errno (ENOMEM);
-	return -1;
-    }
+	if (newbrk < addr) {
+		__set_errno (ENOMEM);
+		return -1;
+	}
 
-    return 0;
+	return 0;
 }
 libc_hidden_def(brk)