From 0f82ae884f3ac2683db9fb4abd0d9be12bb83606 Mon Sep 17 00:00:00 2001
From: Perry Hung <iperry@gmail.com>
Date: Fri, 17 Sep 2010 03:57:52 -0400
Subject: Forgot to add exc.S

whoops.
---
 libmaple/exc.S | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 libmaple/exc.S

(limited to 'libmaple/exc.S')

diff --git a/libmaple/exc.S b/libmaple/exc.S
new file mode 100644
index 0000000..541a61a
--- /dev/null
+++ b/libmaple/exc.S
@@ -0,0 +1,38 @@
+.text
+
+# On an exception, push a fake stack thread mode stack frame and redirect
+# thread execution to a thread mode error handler
+
+# From RM008:
+# The SP is decremented by eight words by the completion of the stack push.
+# Figure 5-1 shows the contents of the stack after an exception pre-empts the
+# current program flow.
+#
+# Old SP--> <previous>
+#           xPSR
+#           PC
+#           LR
+#           r12
+#           r3
+#           r2
+#           r1
+#    SP-->  r0
+
+.globl HardFaultException
+.thumb_func
+HardFaultException:
+   ldr r0, CPSR_MASK           @ Set default CPSR
+   push {r0}
+   ldr r0, TARGET_PC           @ Set target pc
+   push {r0}
+   sub sp, sp, #24             @ its not like i even care
+   ldr r0, EXC_RETURN          @ Return to thread mode
+   mov lr, r0
+   bx lr                       @ Exception exit
+
+ .align 4
+ CPSR_MASK:  .word 0x61000000
+ EXC_RETURN: .word 0xFFFFFFF9
+ TARGET_PC:  .word throb
+
+
-- 
cgit v1.2.3


From ff31b640dd7614faa29466ed02da5267c2a02225 Mon Sep 17 00:00:00 2001
From: Perry Hung <iperry@gmail.com>
Date: Fri, 17 Sep 2010 04:27:08 -0400
Subject: Add MIT license on exc.S

---
 libmaple/exc.S | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

(limited to 'libmaple/exc.S')

diff --git a/libmaple/exc.S b/libmaple/exc.S
index 541a61a..a9f6561 100644
--- a/libmaple/exc.S
+++ b/libmaple/exc.S
@@ -1,4 +1,26 @@
-.text
+/* *****************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ * ****************************************************************************/
 
 # On an exception, push a fake stack thread mode stack frame and redirect
 # thread execution to a thread mode error handler
@@ -18,6 +40,7 @@
 #           r1
 #    SP-->  r0
 
+.text
 .globl HardFaultException
 .thumb_func
 HardFaultException:
-- 
cgit v1.2.3