Revert "syscall.c: Use common syscall.c for ARM"

This reverts commit b1913a876059949e6c309bafade55e9425ef33fb.
OABI is still a requirement. So we override the common syscall
implementation specifically for arm port.

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/arm/syscall.c b/libc/sysdeps/linux/arm/syscall.c
new file mode 100644
index 000000000..60fbcf89b
--- /dev/null
+++ b/libc/sysdeps/linux/arm/syscall.c
@@ -0,0 +1,53 @@
+/* vi: set sw=4 ts=4: */
+/* syscall for arm/uClibc
+ *
+ * Copyright (C) 2002 by Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+
+long syscall(long sysnum, long a, long b, long c, long d, long e, long f)
+{
+#if !defined(__thumb__)
+	register long _r0 __asm__("r0")=(long)(sysnum);
+	register long _r6 __asm__("r6")=(long)(f);
+	register long _r5 __asm__("r5")=(long)(e);
+	register long _r4 __asm__("r4")=(long)(d);
+	register long _r3 __asm__("r3")=(long)(c);
+	register long _r2 __asm__("r2")=(long)(b);
+	register long _r1 __asm__("r1")=(long)(a);
+	__asm__ __volatile__(
+			"swi %1"
+			: "=r"(_r0)
+			: "i"(__NR_syscall), "r"(_r0), "r"(_r1),
+			"r"(_r2), "r"(_r3), "r"(_r4), "r"(_r5),
+			"r"(_r6)
+			: "memory");
+#else
+	register long _r7 __asm__("r7")=(long)(sysnum);
+	register long _r5 __asm__("r5")=(long)(f);
+	register long _r4 __asm__("r4")=(long)(e);
+	register long _r3 __asm__("r3")=(long)(d);
+	register long _r2 __asm__("r2")=(long)(c);
+	register long _r1 __asm__("r1")=(long)(b);
+	register long _r0 __asm__("r0")=(long)(a);
+	__asm__ __volatile__(
+			"swi 0"
+			: "=r"(_r0)
+			: "r"(_r0), "r"(_r1), "r"(_r2), "r"(_r3),
+			"r"(_r4), "r"(_r5), "r"(_r7)
+			: "memory");
+#endif
+	if(_r0 >=(unsigned long) -4095) {
+		long err = _r0;
+		(*__errno_location())=(-err);
+		_r0=(unsigned long) -1;
+	}
+	return (long) _r0;
+}