Re: [Qemu-devel] Re: PC traces from QEMU

[Stuart Brady <sdbrady@ntlworld.com>]

On Thu, Mar 29, 2007 at 06:28:14PM -0700, Shashidhar Mysore wrote:
> Hi Stuart,
> 
> Thanks for the reply, but since I'm a little new to qemu, can you please
> elaborate on how to insert the op_dump_pc function to extract the PC values?

Well, here's a patch that does it:

Index: target-i386/exec.h
===================================================================
RCS file: /sources/qemu/qemu/target-i386/exec.h,v
retrieving revision 1.31
diff -u -r1.31 exec.h
--- target-i386/exec.h	24 Sep 2006 18:40:46 -0000	1.31
+++ target-i386/exec.h	30 Mar 2007 11:02:08 -0000
@@ -146,6 +146,8 @@
 
 extern CCTable cc_table[];
 
+void helper_dump_pc(target_ulong PC);
+
 void load_seg(int seg_reg, int selector);
 void helper_ljmp_protected_T0_T1(int next_eip);
 void helper_lcall_real_T0_T1(int shift, int next_eip);
Index: target-i386/helper.c
===================================================================
RCS file: /sources/qemu/qemu/target-i386/helper.c,v
retrieving revision 1.74
diff -u -r1.74 helper.c
--- target-i386/helper.c	1 Feb 2007 22:12:19 -0000	1.74
+++ target-i386/helper.c	30 Mar 2007 11:02:09 -0000
@@ -30,6 +30,16 @@
 } while (0)
 #endif
 
+void helper_dump_pc(target_ulong pc)
+{
+    if (logfile)
+#ifdef TARGET_X86_64
+        fprintf(logfile, "PC = %016" PRIx64 "\n", pc);
+#else
+        fprintf(logfile, "PC = %08x\n", pc);
+#endif
+}
+
 const uint8_t parity_table[256] = {
     CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
     0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
Index: target-i386/op.c
===================================================================
RCS file: /sources/qemu/qemu/target-i386/op.c,v
retrieving revision 1.47
diff -u -r1.47 op.c
--- target-i386/op.c	1 Feb 2007 22:11:07 -0000	1.47
+++ target-i386/op.c	30 Mar 2007 11:02:09 -0000
@@ -132,6 +132,11 @@
 
 #endif
 
+void OPPROTO op_dump_pc(void)
+{
+    helper_dump_pc(PARAM1);
+}
+
 /* operations with flags */
 
 /* update flags with T0 and T1 (add/sub case) */
Index: target-i386/translate.c
===================================================================
RCS file: /sources/qemu/qemu/target-i386/translate.c,v
retrieving revision 1.62
diff -u -r1.62 translate.c
--- target-i386/translate.c	16 Jan 2007 19:28:58 -0000	1.62
+++ target-i386/translate.c	30 Mar 2007 11:02:10 -0000
@@ -3155,6 +3155,7 @@
     int rex_w, rex_r;
 
     s->pc = pc_start;
+    gen_op_dump_pc(s->pc);
     prefixes = 0;
     aflag = s->code32;
     dflag = s->code32;

It's probably not the best way to do this, but it worked well enough for
my purposes.  (target-z80 -- where there is only one address space! :-)
-- 
Stuart Brady