mgdb: x86_dr_low support: initial implementation and integration.

1 files changed, 61 insertions, 0 deletions

diff --git a/overlay/mgdb/gdb/winnt-nat.c b/overlay/mgdb/gdb/winnt-nat.c
index e326578..ed3fa53 100644
--- a/overlay/mgdb/gdb/winnt-nat.c
+++ b/overlay/mgdb/gdb/winnt-nat.c
@@ -35,6 +35,8 @@
 #define winnt_perror(msg,pid) \
 	error("%s(): %s (pid %d).",__FUNCTION__,msg,pid)
 
+#define WINNT_DR_STATE_DIRTY (0x1)
+
 struct regcache;
 
 struct winnt_process {
@@ -47,6 +49,8 @@ struct winnt_process {
 	struct __dbg_module_info *	modules;
 	struct __dbg_event		event;
 	char *				solibs;
+	uintptr_t			dr_cache[8];
+	uint32_t			dr_state;
 };
 
 static size_t          pcnt;
@@ -857,6 +861,61 @@ static int winnt_perk_init(void)
 	return pe_get_driver_ctx(argv,0,0,0,&pe_dctx);
 }
 
+#define WINNT_DR_HANDLER(handler) \
+	winnt_dr_ ## handler
+
+#define WINNT_SET_DR_LOW_HANDLER(handler) \
+	x86_dr_low.handler = WINNT_DR_HANDLER(handler)
+
+static void winnt_dr_set_addr(int idx, uintptr_t any)
+{
+	pid_t			pid;
+	struct winnt_process *	pidinfo;
+
+	pid     = ptid_get_pid(inferior_ptid);
+	pidinfo = winnt_process_record(pid);
+
+	pidinfo->dr_cache[idx] = any;
+	pidinfo->dr_state      = WINNT_DR_STATE_DIRTY;
+}
+
+static uintptr_t winnt_dr_get_addr(int idx)
+{
+	pid_t			pid;
+	struct winnt_process *	pidinfo;
+
+	pid     = ptid_get_pid(inferior_ptid);
+	pidinfo = winnt_process_record(pid);
+
+	return pidinfo->dr_cache[idx];
+}
+
+static void winnt_dr_set_control(unsigned long ctrl)
+{
+	winnt_dr_set_addr(7,ctrl);
+}
+
+static unsigned long winnt_dr_get_control(void)
+{
+	return winnt_dr_get_addr(7);
+}
+
+static unsigned long winnt_dr_get_status(void)
+{
+	return winnt_dr_get_addr(6);
+}
+
+static void winnt_init_dr_low(void)
+{
+	WINNT_SET_DR_LOW_HANDLER(set_control);
+	WINNT_SET_DR_LOW_HANDLER(get_control);
+	WINNT_SET_DR_LOW_HANDLER(get_status);
+	WINNT_SET_DR_LOW_HANDLER(set_addr);
+	WINNT_SET_DR_LOW_HANDLER(get_addr);
+
+	x86_set_debug_register_length(sizeof(uintptr_t));
+}
+
 static target_ops * winnt_target_alloc (void)
 {
 	target_ops * t = inf_child_target();
@@ -892,6 +951,8 @@ static target_ops * winnt_target_alloc (void)
 
 	x86_use_watchpoints(t);
 
+	winnt_init_dr_low();
+
 	if (winnt_perk_init() < 0)
 		return 0;