GDB stub (#1583)

* gdbstub beginnings

* gdbstub: finish gdb impl things, next up is integration with melonDS

* holy fuck the gdbstub works

* gdb breakpoints work, but there's a mysterious crash on continue

* fix memory corruption that sometimes happened, and make resetting the console thru gdb work

* remove some gdb debug printing

* fix things in gdbstub

* separate option for enabling gdbstub

* add mode-dependent CPU registers

* C++ize the GDBstub code

* add gdbstub config in emu settings dialog

* make sure gdb is disabled when jit is enabled

* Remove unnecessary compiler flags, mark ARMJIT assembly code as no-execute-stack

This hardens the binary a little bit against common exploitation methods

* add option to wait for debugger attach on startup

* only insert GNU stack notes on linux

* disable gdbstub enable checkbox when jit is enabled

* fix non-linux incompatibilities

* enable gdbstub by default

* fix issues with gdbstub settings disable stuff

* format stuff

* update gdb test code

* Fix segfault when calling StubCallbacks->GetCPU()

C++ overrides are hard. Please I'm just a lowly C programmer.

* fix packet size not being sent correctly

Thanks to @GlowingUmbreon on Github for troubleshooting this

* fix select(2) calls (i should read docs more properly)

* fix GDB command sequencing/parsing issue (hopefully)

* [GDB] implement no-ack mode

* fix sending ack on handshake

* get lldb to work

1 files changed, 53 insertions, 0 deletions

diff --git a/src/debug/GdbCmds.h b/src/debug/GdbCmds.h
new file mode 100644
index 0000000..4f30060
--- /dev/null
+++ b/src/debug/GdbCmds.h
@@ -0,0 +1,53 @@
+
+#ifndef GDBSTUB_H_
+#error "DO NOT INCLUDE THIS FILE YOURSELF!"
+#endif
+
+private:
+	static ExecResult Handle_g(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_G(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_m(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_M(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_X(GdbStub* stub, const u8* cmd, ssize_t len);
+
+	static ExecResult Handle_c(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_s(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_p(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_P(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_H(GdbStub* stub, const u8* cmd, ssize_t len);
+
+	static ExecResult Handle_Question(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_Exclamation(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_D(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_r(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_R(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_k(GdbStub* stub, const u8* cmd, ssize_t len);
+
+	static ExecResult Handle_z(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_Z(GdbStub* stub, const u8* cmd, ssize_t len);
+
+	static ExecResult Handle_q(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_v(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_Q(GdbStub* stub, const u8* cmd, ssize_t len);
+
+	static ExecResult Handle_q_HostInfo(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_q_Rcmd(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_q_Supported(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_q_CRC(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_q_C(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_q_fThreadInfo(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_q_sThreadInfo(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_q_TStatus(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_q_features(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_q_Attached(GdbStub* stub, const u8* cmd, ssize_t len);
+
+	static ExecResult Handle_v_Attach(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_v_Kill(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_v_Run(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_v_Stopped(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_v_MustReplyEmpty(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_v_Cont(GdbStub* stub, const u8* cmd, ssize_t len);
+	static ExecResult Handle_v_ContQuery(GdbStub* stub, const u8* cmd, ssize_t len);
+
+	static ExecResult Handle_Q_StartNoAckMode(GdbStub* stub, const u8* cmd, ssize_t len);
+