From e8aae1bb96522e64a9cdf82be40b3cf71f2f711d Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Sun, 15 Sep 2019 21:16:44 +0000
Subject: mgdb; winnt_resume{_one|_all}(): initial implementation and
 integration.

---
 overlay/mgdb/gdb/winnt-nat.c | 91 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 89 insertions(+), 2 deletions(-)

diff --git a/overlay/mgdb/gdb/winnt-nat.c b/overlay/mgdb/gdb/winnt-nat.c
index 9f25f4e..e5d054a 100644
--- a/overlay/mgdb/gdb/winnt-nat.c
+++ b/overlay/mgdb/gdb/winnt-nat.c
@@ -29,6 +29,8 @@
 #include <perk/perk.h>
 
 #define WINNT_OUTBUF_SIZE 65536
+#define X86_DR_RTM_MASK   (1 << 16)
+#define X86_EFLAGS_TRACE  (1 << 8)
 
 #define winnt_error(msg) \
 	error("%s(): %s.",__FUNCTION__,msg)
@@ -458,7 +460,6 @@ static void winnt_add_thread(int pfd, ptid_t ptid)
 	struct winnt_process *	pidinfo;
 	struct winnt_thread *	thread;
 	mcontext_t *		tctx;
-	uint32_t		dr_rtm_mask = (1 << 16);
 
 	pid     = ptid_get_pid(inferior_ptid);
 	pidinfo = winnt_process_record(pid);
@@ -474,7 +475,7 @@ static void winnt_add_thread(int pfd, ptid_t ptid)
 	tctx->uc_dr1 = pidinfo->dr_cache[1];
 	tctx->uc_dr2 = pidinfo->dr_cache[2];
 	tctx->uc_dr3 = pidinfo->dr_cache[3];
-	tctx->uc_dr6 = dr_rtm_mask;
+	tctx->uc_dr6 = X86_DR_RTM_MASK;
 	tctx->uc_dr7 = pidinfo->dr_cache[7];
 
 	winnt_set_thread_context_state(
@@ -804,11 +805,97 @@ static ptid_t winnt_wait(
 	return inferior_ptid;
 }
 
+static void winnt_resume_one(ptid_t ptid, int step, enum gdb_signal sig)
+{
+	pid_t                  tid;
+	struct winnt_process * process;
+	struct winnt_thread *  thread;
+	mcontext_t *           tctx;
+	int                    response;
+
+	if ((tid = inferior_ptid.tid) <= 0)
+		if ((process = winnt_process_record(ptid.pid)))
+			tid = process->systid;
+
+	if (!(thread = winnt_get_thread_from_ptid(ptid)))
+		winnt_perror("internal error: thread record not found",tid);
+
+	process = thread->process;
+	tctx    = &thread->regctx;
+
+	if (process->dr_state) {
+		tctx->uc_dr0 = process->dr_cache[0];
+		tctx->uc_dr1 = process->dr_cache[1];
+		tctx->uc_dr2 = process->dr_cache[2];
+		tctx->uc_dr3 = process->dr_cache[3];
+		tctx->uc_dr6 = X86_DR_RTM_MASK;
+		tctx->uc_dr7 = process->dr_cache[7];
+	}
+
+	if (step && !(tctx->uc_eflags & X86_EFLAGS_TRACE)) {
+		tctx->uc_eflags |= X86_EFLAGS_TRACE;
+		winnt_set_thread_context_state(
+			thread,
+			WINNT_THREAD_CONTEXT_DIRTY);
+	}
+
+	if (process->dr_state || tctx->uc_context_flags)
+		__dbg_regs_store(process->pfd,tid,tctx);
+
+	if (tid == process->event.systid) {
+		switch (process->event.evttype) {
+			case __DBG_STATE_EXCEPTION:
+				response = __DBG_RESPONSE_EXCEPTION_NOT_HANDLED;
+				break;
+
+			default:
+				response = __DBG_RESPONSE_CONTINUE;
+				break;
+		}
+
+		process->event.eresponse = response;
+
+		__dbg_event_respond(
+			process->pfd,
+			&process->event);
+
+		process->event.syspid = 0;
+		process->event.systid = 0;
+	}
+}
+
+static void winnt_resume_all(int step, enum gdb_signal sig)
+{
+	struct winnt_process * pdbg;
+	struct winnt_process * pcap;
+	struct winnt_thread *  thread;
+	ptid_t                 ptid;
+
+	for (pdbg=plist, pcap=&plist[pcnt]; pdbg<pcap; pdbg++) {
+		if (pdbg->pfd && (thread = pdbg->threads)) {
+			for (; thread; ) {
+				ptid.pid = pdbg->syspid;
+				ptid.tid = thread->tid;
+				ptid.lwp = 0;
+
+				winnt_resume_one(ptid,step,sig);
+
+				thread = thread->next;
+			}
+		}
+	}
+}
+
 static void winnt_resume (
 	struct target_ops * t,
 	ptid_t ptid, int step,
 	enum gdb_signal sig)
 {
+	target_terminal_inferior();
+
+	ptid_equal(ptid,minus_one_ptid)
+		? winnt_resume_all(step,sig)
+		: winnt_resume_one(ptid,step,sig);
 }
 
 static void winnt_kill (struct target_ops * t)
-- 
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