From cb2d7f800a9fc276b96fd0927fa6d8ec9f5a31c8 Mon Sep 17 00:00:00 2001
From: Xavier Del Campo Romero <xavi.dcr@tutanota.com>
Date: Fri, 29 May 2020 00:05:08 +0200
Subject: Implemented port-specific wrappers and logic for gdb stub

---
 libpcsxcore/debug.c          |  4 +--
 libpcsxcore/psxinterpreter.c | 64 +++++++++++++++++++++++++++++++++++++++++++-
 libpcsxcore/socket.c         |  3 ++-
 libpcsxcore/socket.h         |  2 +-
 4 files changed, 68 insertions(+), 5 deletions(-)

(limited to 'libpcsxcore')

diff --git a/libpcsxcore/debug.c b/libpcsxcore/debug.c
index 463df73b..ecc9edc7 100644
--- a/libpcsxcore/debug.c
+++ b/libpcsxcore/debug.c
@@ -397,7 +397,7 @@ void DebugVSync() {
 
     if (client_socket < 1)
     {
-        client_socket = GetClient(server_socket);
+        client_socket = GetClient(server_socket, 0);
 
         if (client_socket > 0)
         {
@@ -478,7 +478,7 @@ void ProcessDebug() {
 
         if (client_socket < 1)
         {
-            client_socket = GetClient(server_socket);
+            client_socket = GetClient(server_socket, 0);
 
             if (client_socket > 0)
             {
diff --git a/libpcsxcore/psxinterpreter.c b/libpcsxcore/psxinterpreter.c
index a2bc0e1d..941fda4b 100644
--- a/libpcsxcore/psxinterpreter.c
+++ b/libpcsxcore/psxinterpreter.c
@@ -1198,6 +1198,68 @@ static void intClear(u32 Addr, u32 Size) {
 static void intShutdown() {
 }
 
+static void process_gdb(void) {
+	static int shutdown;
+	static u32 tgt_addr;
+	static int step, must_continue;
+	struct msg msg;
+
+	if (shutdown)
+		return;
+
+	if (step || (must_continue && tgt_addr && tgt_addr == psxRegs.pc)) {
+		msg.type = MSG_TYPE_HIT;
+#if DEBUG == 1
+		printf("hit address 0x%08X\n", psxRegs.pc);
+#endif
+		gdbstub_sys_send(&msg);
+		must_continue = 0;
+		step = 0;
+	}
+
+	if (!must_continue) {
+		gdbstub_sys_recv(&msg);
+
+		switch (msg.type) {
+			case MSG_TYPE_CONTINUE:
+				must_continue = 1;
+				break;
+
+			case MSG_TYPE_STEP:
+				step = 1;
+				break;
+
+			case MSG_TYPE_REMOVE_BREAKPOINT: {
+				struct msg out;
+
+				tgt_addr = 0;
+				out.type = MSG_TYPE_ACK;
+
+				gdbstub_sys_send(&out);
+			}
+				break;
+
+			case MSG_TYPE_BREAKPOINT: {
+				struct msg out;
+
+				tgt_addr = msg.data.breakpoint.addr;
+				out.type = MSG_TYPE_ACK;
+
+				gdbstub_sys_send(&out);
+			}
+				break;
+
+			case MSG_TYPE_SHUTDOWN:
+				shutdown = 1;
+				break;
+
+			default:
+				fprintf(stderr, "unknown msg.type %d\n", msg.type);
+				break;
+		}
+	}
+}
+
 // interpreter execution
 static inline void execI() {
 	u32 *code = Read_ICache(psxRegs.pc, FALSE);
@@ -1205,7 +1267,7 @@ static inline void execI() {
 
 	debugI();
 
-	if (Config.GdbServer) dbg_sys_process();
+	if (Config.GdbServer) process_gdb();
 	else if (Config.Debug) ProcessDebug();
 
 	psxRegs.pc += 4;
diff --git a/libpcsxcore/socket.c b/libpcsxcore/socket.c
index 51aefdf7..eec4c96a 100644
--- a/libpcsxcore/socket.c
+++ b/libpcsxcore/socket.c
@@ -88,7 +88,7 @@ void StopServer(int s_socket) {
 #endif
 }
 
-int GetClient(int s_socket) {
+int GetClient(int s_socket, int blocking) {
     int new_socket = accept(s_socket, NULL, NULL);
 
 #ifdef _WIN32
@@ -100,6 +100,7 @@ int GetClient(int s_socket) {
 #endif
 
 #ifndef _WIN32
+    if (!blocking)
     {
         int flags;
         flags = fcntl(new_socket, F_GETFL, 0);
diff --git a/libpcsxcore/socket.h b/libpcsxcore/socket.h
index 531a6485..852c76a4 100644
--- a/libpcsxcore/socket.h
+++ b/libpcsxcore/socket.h
@@ -35,7 +35,7 @@ enum read_socket_err
 int StartServer(unsigned short port);
 void StopServer(int s_socket);
 
-int GetClient(int s_socket);
+int GetClient(int s_socket, int blocking);
 void CloseClient(int client_socket);
 
 int HasClient(int client_socket);
-- 
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