ARC port to uClibc

For this port, I would like to give due credit to:

- Folks from Codito technologies (Sameer, Amit, Kanika, Ramana,...)
   who did the very first port

- ARC UK from 2007-2009 (Joern, Irfan, Khurram, Phil...

- Late Brendan Kehoe (may he RIP)

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/arc/__longjmp.S b/libc/sysdeps/linux/arc/__longjmp.S
new file mode 100644
index 000000000..91d1852af
--- /dev/null
+++ b/libc/sysdeps/linux/arc/__longjmp.S
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sysdep.h>
+
+;@ r0 = jump buffer from which regs will be restored
+;@ r1 = value that setjmp( ) will return due to this longjmp
+
+ENTRY(__longjmp)
+
+	ld_s r13, [r0]
+	ld_s r14, [r0,4]
+	ld   r15, [r0,8]
+	ld   r16, [r0,12]
+	ld   r17, [r0,16]
+	ld   r18, [r0,20]
+	ld   r19, [r0,24]
+	ld   r20, [r0,28]
+	ld   r21, [r0,32]
+	ld   r22, [r0,36]
+	ld   r23, [r0,40]
+	ld   r24, [r0,44]
+	ld   r25, [r0,48]
+
+	ld   blink, [r0,60]	; load it early enough to not stall the pipeline
+	ld   fp,    [r0,52]
+	ld   sp,    [r0,56]
+
+	mov.f  r0, r1	; get the setjmp return value(due to longjmp) in place
+
+	j.d    [blink]	; to caller of setjmp location, right after the call
+	mov.z  r0, 1	; can't let setjmp return 0 when it is due to longjmp
+
+END(__longjmp)
+libc_hidden_def(__longjmp)