wiki/bus_space_trace.patch at master · start-printf/wiki · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
Index: arch/i386/i386/busfunc.S
===================================================================
RCS file: /home/kiwamu/cvs_mirror/NetBSD-CVSROOT/src/sys/arch/i386/i386/busfunc.S,v
retrieving revision 1.8
diff -c -u -r1.8 busfunc.S
--- arch/i386/i386/busfunc.S	20 May 2011 13:17:12 -0000	1.8
+++ arch/i386/i386/busfunc.S	16 Feb 2013 08:01:46 -0000
@@ -92,7 +92,7 @@
  * void bus_space_write_1(bus_space_tag_t tag, bus_space_handle_t bsh,
  *    bus_size_t offset, uint8_t value);
  */
-ENTRY(bus_space_write_1)
+ENTRY(bus_space_write_1_ll)
 	movl	4(%esp), %eax
 	movl	8(%esp), %edx
 	addl	12(%esp), %edx
Index: kern/kern_stub.c
===================================================================
RCS file: /home/kiwamu/cvs_mirror/NetBSD-CVSROOT/src/sys/kern/kern_stub.c,v
retrieving revision 1.36
diff -c -u -r1.36 kern_stub.c
--- kern/kern_stub.c	31 Aug 2011 20:09:57 -0000	1.36
+++ kern/kern_stub.c	16 Feb 2013 10:04:02 -0000
@@ -294,3 +294,32 @@

 	return memcmp(&t1, &t2, sizeof(t1)) == 0;
 }
+
+void bus_space_write_1_ll(bus_space_tag_t, bus_space_handle_t, bus_size_t, uint8_t);
+
+int whileprint_retaddr1 = 0xf0f0f0f0;
+int whileprint_retaddr2 = 0xf0f0f0f0;
+int whileprint_retaddr3 = 0xf0f0f0f0;
+
+struct i386_frame {
+	struct i386_frame	*f_frame;
+	int			f_retaddr;
+	int			f_arg0;
+};
+
+void
+bus_space_write_1(bus_space_tag_t tag, bus_space_handle_t bsh, bus_size_t offset, uint8_t value)
+{
+	struct i386_frame *frame;
+
+	if (strcmp("whileprint", curproc->p_comm) == 0) {
+		asm volatile("movl %%ebp, %0" : "=r" (frame));
+		whileprint_retaddr1 = frame->f_retaddr;
+		frame = frame->f_frame;
+		whileprint_retaddr2 = frame->f_retaddr;
+		frame = frame->f_frame;
+		whileprint_retaddr3 = frame->f_retaddr;
+	}
+
+	bus_space_write_1_ll(tag, bsh, offset, value);
+}