[Qemu-devel] [patch] Thumb disassembly

[Qemu-devel] [patch] Thumb disassembly

[Paul Brook]

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The attached patch implements disassembly of arm thumb instructions in the 
debugging dumps.

Paul

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Index: arm-dis.c
===================================================================
RCS file: /cvsroot/qemu/qemu/arm-dis.c,v
retrieving revision 1.2
diff -u -p -r1.2 arm-dis.c
--- arm-dis.c	9 Jul 2003 17:10:32 -0000	1.2
+++ arm-dis.c	26 Apr 2005 22:41:39 -0000
@@ -1556,6 +1556,11 @@ print_insn_arm (pc, info)
     }
   
   is_thumb = force_thumb;
+  if (pc & 1)
+    {
+      is_thumb = 1;
+      pc &= ~(bfd_vma) 1;
+    }
   
 #if 0
   if (!is_thumb && info->symbols != NULL)
Index: disas.c
===================================================================
RCS file: /cvsroot/qemu/qemu/disas.c,v
retrieving revision 1.21
diff -u -p -r1.21 disas.c
--- disas.c	23 Apr 2005 18:16:07 -0000	1.21
+++ disas.c	26 Apr 2005 22:41:39 -0000
@@ -108,8 +108,20 @@ bfd_vma bfd_getb32 (const bfd_byte *addr
   return (bfd_vma) v;
 }
 
-/* Disassemble this for me please... (debugging). 'flags' is only used
-   for i386: non zero means 16 bit code */
+#ifdef TARGET_ARM
+static int
+print_insn_thumb1(bfd_vma pc, disassemble_info *info)
+{
+  return print_insn_arm(pc | 1, info);
+}
+#endif
+
+/* Disassemble this for me please... (debugging). 'flags' has teh following
+   values:
+    i386 - nonzero means 16 bit code
+    arm  - nonzero means thumb code 
+    other targets - unused
+ */
 void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
 {
     target_ulong pc;
@@ -137,7 +149,10 @@ void target_disas(FILE *out, target_ulon
         disasm_info.mach = bfd_mach_i386_i386;
     print_insn = print_insn_i386;
 #elif defined(TARGET_ARM)
-    print_insn = print_insn_arm;
+    if (flags)
+	print_insn = print_insn_thumb1;
+    else
+	print_insn = print_insn_arm;
 #elif defined(TARGET_SPARC)
     print_insn = print_insn_sparc;
 #elif defined(TARGET_PPC)