From 329f0bd95d50fe9bd2d44f0a1899d428e0662a84 Mon Sep 17 00:00:00 2001
From: "Wesley W. Terpstra" <w.terpstra@gsi.de>
Date: Tue, 4 Oct 2011 13:12:51 +0200
Subject: [PATCH] Added a weak _debug_unit symbol to crt0.S.
When linked against debug.S, which provides this symbol, this will setup debugging.
If not linked against debug.S the symbol will be the same as _reset_handler.
---
target/lm32/crt0.S | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/target/lm32/crt0.S b/target/lm32/crt0.S
index de7de225e..573c5ccf4 100755
--- a/target/lm32/crt0.S
+++ b/target/lm32/crt0.S
@@ -88,8 +88,9 @@
.section .boot, "ax", @progbits
.global _start
+ .weak _debug_unit
_start:
-
+_debug_unit:
.global _reset_handler
.type _reset_handler, @function
_reset_handler:
@@ -127,6 +128,12 @@ _interrupt_handler:
_crt0:
/* Clear r0 */
xor r0, r0, r0
+
+ /* Setup the debug ROM if it's linked in */
+ mvhi r1, hi(_debug_unit)
+ ori r1, r1, lo(_debug_unit)
+ wcsr DEBA
+
/* Setup stack and global pointer */
mvhi sp, hi(_fstack)
ori sp, sp, lo(_fstack)
@@ -139,7 +146,7 @@ _crt0:
mvhi r3, hi(_ebss)
ori r3, r3, lo(_ebss)
sub r3, r3, r1
- calli memset
+ calli memset
mvi r1, 0
mvi r2, 0
mvi r3, 0
--
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