From eb1a610f9217e0d1d0332d2e3f7f696c9eef7337 Mon Sep 17 00:00:00 2001
From: CreeperMario <creepermario2@gmail.com>
Date: Thu, 11 Jan 2018 18:21:06 +1030
Subject: [PATCH] whb: Exception handler now works

* The context structure for the crash handler thread needs to be aligned
to at least 8 bytes.
* In my cases, the entry at the bottom of my stack always has a
back-chain value of 0x1. Of course, this address is not likely to be
part of the stack, so this should be considered to be the end of the
stack.
* During ISI exceptions, only a stack trace is printed, and during DSI,
disassembly and stack information is printed. For some unknown reason, I
never see register dumps.
---
 src/libwhb/src/crash.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libwhb/src/crash.c b/src/libwhb/src/crash.c
index 65095d2..85f5b14 100644
--- a/src/libwhb/src/crash.c
+++ b/src/libwhb/src/crash.c
@@ -40,7 +40,7 @@ sRegistersLength = 0;
 static uint8_t
 sCrashThreadStack[THREAD_STACK_SIZE];
 
-static OSThread
+static OSThread __attribute__((aligned(8)))
 sCrashThread;
 
 static int
@@ -96,7 +96,7 @@ getStackTrace(OSContext *context)
    for (i = 0; i < 16; ++i) {
       uint32_t addr;
 
-      if (!stackPtr || (uintptr_t)stackPtr == 0xFFFFFFFF) {
+      if (!stackPtr || (uintptr_t)stackPtr == 0x1 || (uintptr_t)stackPtr == 0xFFFFFFFF) {
          break;
       }