simplify XScale debug handler installation

Load the XScale debug handler from the read-only data section
instead of from a separate file that can get lost or garbaged.
This eliminates installation and versioning issues, and also
speeds up reset handling a bit.

Plus some minor bits of cleanup related to loading that handler:
comments about just what this handler does, and check fault codes
while writing it into the mini-icache.

The only behavioral changes should be cleaner failure modes after
errors during handler loading, and being a bit faster.

NOTE:  presumes GNU assembly syntax, with ".incbin"; and ELF,
because of the syntax of the ".size" directive.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/target/xscale_debug.S b/src/target/xscale_debug.S
new file mode 100644
index 00000000..0a7b87d2
--- /dev/null
+++ b/src/target/xscale_debug.S
@@ -0,0 +1,13 @@
+	.section	.rodata
+
+	.align		4
+	.global		 xscale_debug_handler
+xscale_debug_handler:
+	.incbin		"xscale/debug_handler.bin"
+	.size		xscale_debug_handler, . - xscale_debug_handler
+
+	.align		4
+	.global		 xscale_debug_handler_size
+xscale_debug_handler_size:
+	.word		. - xscale_debug_handler
+	.size		xscale_debug_handler_size, 4