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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
--- gdb/amd64bsd-nat.c.orig 2011-09-23 01:35:24.211306143 +0100
+++ gdb/amd64bsd-nat.c 2011-09-23 01:28:28.444487431 +0100
@@ -33,6 +33,7 @@
#include "amd64-tdep.h"
#include "amd64-nat.h"
+#include "amd64bsd-nat.h"
#include "inf-ptrace.h"
@@ -126,3 +127,80 @@
t->to_store_registers = amd64bsd_store_inferior_registers;
return t;
}
+
+
+/* Support for debug registers. */
+
+#ifdef HAVE_PT_GETDBREGS
+
+/* Not all versions of FreeBSD/i386 that support the debug registers
+ have this macro. */
+#ifndef DBREG_DRX
+#define DBREG_DRX(d, x) ((&d->dr0)[x])
+#endif
+
+static void
+amd64bsd_dr_set (int regnum, unsigned long value)
+{
+ struct dbreg dbregs;
+
+ if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
+ perror_with_name (_("Couldn't get debug registers"));
+
+ /* For some mysterious reason, some of the reserved bits in the
+ debug control register get set. Mask these off, otherwise the
+ ptrace call below will fail. */
+ DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);
+
+ DBREG_DRX ((&dbregs), regnum) = value;
+
+ if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
+ perror_with_name (_("Couldn't write debug registers"));
+}
+
+void
+amd64bsd_dr_set_control (unsigned long control)
+{
+ amd64bsd_dr_set (7, control);
+}
+
+void
+amd64bsd_dr_set_addr (int regnum, CORE_ADDR addr)
+{
+ gdb_assert (regnum >= 0 && regnum <= 4);
+
+ amd64bsd_dr_set (regnum, addr);
+}
+
+void
+amd64bsd_dr_reset_addr (int regnum)
+{
+ gdb_assert (regnum >= 0 && regnum <= 4);
+
+ amd64bsd_dr_set (regnum, 0);
+}
+
+unsigned long
+amd64bsd_dr_get_status (void)
+{
+ struct dbreg dbregs;
+
+ /* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
+ ptrace call fails breaks debugging remote targets. The correct
+ way to fix this is to add the hardware breakpoint and watchpoint
+ stuff to the target vector. For now, just return zero if the
+ ptrace call fails. */
+ if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
+#if 0
+ perror_with_name (_("Couldn't read debug registers"));
+#else
+ return 0;
+#endif
+
+ return DBREG_DRX ((&dbregs), 6);
+}
+
+#endif /* PT_GETDBREGS */
|
