From 222ac4f0570e7620e50c498ddecd56d0d2e9bbdb Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Mon, 2 Sep 2019 04:13:11 +0000
Subject: mgdb: winnt_prepare(), winnt_respond(): initial implementation and
 integration.

---
 overlay/mgdb/gdb/winnt-nat.c | 112 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)

diff --git a/overlay/mgdb/gdb/winnt-nat.c b/overlay/mgdb/gdb/winnt-nat.c
index cdfa210..5d2d309 100644
--- a/overlay/mgdb/gdb/winnt-nat.c
+++ b/overlay/mgdb/gdb/winnt-nat.c
@@ -10,6 +10,7 @@
 #include "target.h"
 #include "utils.h"
 #include "inferior.h"
+#include "gdbthread.h"
 #include "inf-child.h"
 #include "x86-nat.h"
 
@@ -29,10 +30,14 @@
 struct winnt_process {
 	int	pfd;
 	pid_t	pid;
+	pid_t	syspid;
+	pid_t	systid;
+	pid_t	flags;
 };
 
 static size_t          pcnt;
 static winnt_process * plist;
+static char            outbuf[256];
 
 static winnt_process * winnt_plist_expand (void)
 {
@@ -99,6 +104,18 @@ static int winnt_pfd_from_pid (pid_t pid)
 	return -1;
 }
 
+static struct winnt_process * winnt_process_record(pid_t pid)
+{
+	winnt_process * pdbg;
+	winnt_process * pcap;
+
+	for (pdbg=plist, pcap=&plist[pcnt]; pdbg<pcap; pdbg++)
+		if (pdbg->pid == pid)
+			return pdbg;
+
+	return 0;
+}
+
 static nfds_t winnt_poll_one_init (struct pollfd * pfds, pid_t pid)
 {
 	winnt_process * pdbg;
@@ -141,6 +158,87 @@ static void winnt_xclose (struct target_ops * t)
 {
 }
 
+static void winnt_respond (int pfd, struct __dbg_event * event, int response)
+{
+	ptid_t ptid;
+
+	event->eresponse = response;
+
+	switch (event->evttype) {
+		case __DBG_STATE_CREATE_PROCESS:
+			ptid = ptid_build(event->syspid,0,0);
+			add_thread(ptid);
+			ptid = ptid_build(event->syspid,0,event->systid);
+			add_thread(ptid);
+			break;
+
+		case __DBG_STATE_CREATE_THREAD:
+			ptid = ptid_build(event->syspid,0,event->systid);
+			add_thread(ptid);
+			break;
+
+		default:
+			break;
+	}
+
+	if (__dbg_event_respond(pfd,event) < 0)
+		winnt_perror("failed to respond to debug event",pfd);
+}
+
+static void winnt_prepare (struct target_ops * t, pid_t pid, int pfd, int attached)
+{
+	int			ret;
+	struct inferior *	cinf;
+	struct __dbg_event	event;
+	struct winnt_process *	pidinfo;
+
+	if (!target_is_pushed(t))
+		push_target(t);
+
+	clear_proceed_status(0);
+	init_wait_for_inferior();
+
+	if (!(cinf = current_inferior()))
+		winnt_error("failed to obtain current inferior");
+
+	if (!(pidinfo = winnt_process_record(pid)))
+		winnt_perror("internal error: record not found",pid);
+
+	inferior_ptid     = pid_to_ptid (pid);
+	cinf->attach_flag = attached;
+
+	inferior_appeared(cinf,pid);
+	init_thread_list();
+
+	while (1) {
+		do {
+			ret = __dbg_event_acquire(pfd,&event);
+		} while ((ret < 0) && (errno == EAGAIN));
+
+		if (ret < 0)
+			winnt_perror("failed to acquire preliminary debug event",pid);
+
+		switch (event.evttype) {
+			case __DBG_STATE_EXCEPTION:
+			case __DBG_STATE_BREAKPOINT:
+			case __DBG_STATE_SINGLE_STEP:
+				pidinfo->syspid = event.syspid;
+				pidinfo->systid = event.systid;
+				return;
+
+			case __DBG_STATE_CREATE_THREAD:
+			case __DBG_STATE_IDLE:
+			case __DBG_STATE_REPLY_PENDING:
+			case __DBG_STATE_CREATE_PROCESS:
+			case __DBG_STATE_DLL_LOAD:
+			case __DBG_STATE_DLL_UNLOAD:
+			case __DBG_STATE_EXIT_THREAD:
+			case __DBG_STATE_EXIT_PROCESS:
+				winnt_respond(pfd,&event,__DBG_RESPONSE_CONTINUE);
+		}
+	}
+}
+
 static void winnt_attach (struct target_ops * t, const char * args, int from_tty)
 {
 	pid_t	pid;
@@ -168,6 +266,8 @@ static void winnt_attach (struct target_ops * t, const char * args, int from_tty
 		close(pfd);
 		winnt_error ("could not expand debuggee list");
 	}
+
+	winnt_prepare(t,pid,pfd,from_tty);
 }
 
 static void winnt_detach (struct target_ops * t, const char * args, int from_tty)
@@ -259,6 +359,16 @@ static void winnt_create_inferior(
 	winnt_error("Not implemented");
 }
 
+static char * winnt_pid_to_str (struct target_ops * t, ptid_t ptid)
+{
+	if (ptid.tid)
+		sprintf(outbuf,"Thread %d:%d",ptid.pid,ptid.tid);
+	else
+		sprintf(outbuf,"Process %d",ptid.pid);
+
+	return outbuf;
+}
+
 static target_ops * winnt_target_alloc (void)
 {
 	target_ops * t = inf_child_target();
@@ -279,6 +389,8 @@ static target_ops * winnt_target_alloc (void)
 	t->to_mourn_inferior            = winnt_mourn_inferior;
 	t->to_create_inferior           = winnt_create_inferior;
 
+	t->to_pid_to_str                = winnt_pid_to_str;
+
 	x86_use_watchpoints(t);
 
 	return t;
-- 
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