From 8d386d80278650ac3a983cc0c324de4b853dfce5 Mon Sep 17 00:00:00 2001
From: meepingsnesroms <guicrith@gmail.com>
Date: Sat, 16 Nov 2019 13:02:12 -0800
Subject: [PATCH] Add another IDA script

---
 src/armv5te/arm_interpreter.cpp |  2 +-
 tools/desktop/applyHalTable.py  | 37 +++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 tools/desktop/applyHalTable.py

diff --git a/src/armv5te/arm_interpreter.cpp b/src/armv5te/arm_interpreter.cpp
index 697aac1..9e6a3b4 100644
--- a/src/armv5te/arm_interpreter.cpp
+++ b/src/armv5te/arm_interpreter.cpp
@@ -528,7 +528,7 @@ void do_arm_instruction(Instruction i)
         arm.reg[15] += (int32_t) (i.branch.immed << 8) >> 6;//TODO: this signed int shift is undefined behavior by the C standard
         arm.reg[15] += 4;
         if(arm.reg[15] >= 0x2009B130 && arm.reg[15] <= 0x200C7EEB && i.branch.l)
-            gui_debug_printf("ARM DAL function called:0x%08X from 0x%08X\n", arm.reg[15], arm.reg[14] - 4);
+            gui_debug_printf("ARM DAL function call, jump from 0x%08X to 0x%08X\n", arm.reg[14] - 4, arm.reg[15]);
     }
     else if((insn & 0xF000F10) == 0xE000F10)
         do_cp15_instruction(i);
diff --git a/tools/desktop/applyHalTable.py b/tools/desktop/applyHalTable.py
new file mode 100644
index 0000000..bf2b40c
--- /dev/null
+++ b/tools/desktop/applyHalTable.py
@@ -0,0 +1,37 @@
+# jumps to DAL address when given execution address
+
+import idc
+import ida_bytes
+import ctypes
+
+
+DAL_JUMP_TABLE = 0x00000024
+
+
+def getBranchOffset(opcode):
+   offset = opcode & 0x007FFFFF;
+   
+   if opcode & 0x00800000:
+      offset |= 0xFF800000;
+      
+   offset = ctypes.c_int(offset).value;
+   
+   offset *= 4
+   offset += 8 # account for PC weirdness
+   
+   return ctypes.c_int(offset).value
+
+def writeAddrName(addr, name):
+   idc.set_name(addr, name + "Entrypoint", SN_NOCHECK)
+   idc.set_name(addr + getBranchOffset(ida_bytes.get_dword(addr)), name, SN_NOCHECK)
+   print hex(addr + getBranchOffset(ida_bytes.get_dword(addr)))
+
+def applyHalTable():
+   with open("C:/Users/Emily/Desktop/Projects/PalmOSEmulator/halTable.txt", 'r') as tblFile:
+      halTable = tblFile.read().split()
+   
+   for x in range(0, len(halTable) / 3):
+      writeAddrName(DAL_JUMP_TABLE + int(halTable[x * 3 + 1], 16), halTable[x * 3 + 2])
+   
+
+applyHalTable()
\ No newline at end of file