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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
This commit is contained in:
PoroCYon
184
src/debug/GdbStub.h
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184
src/debug/GdbStub.h
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#ifndef GDBSTUB_H_
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#define GDBSTUB_H_
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#include <stddef.h>
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#include <map>
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#include <vector>
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#include "../types.h"
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#include "GdbArch.h"
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namespace Gdb
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{
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enum class TgtStatus
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{
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NoEvent,
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None,
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Running,
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SingleStep,
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BreakReq, // "break" command from gdb client
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Bkpt,
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Watchpt,
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BkptInsn, // "bkpt" instruction
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FaultData, // data abort
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FaultIAcc, // instruction fetch abort
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FaultInsn, // illegal instruction
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};
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class StubCallbacks
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{
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public:
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StubCallbacks(){}
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virtual ~StubCallbacks(){};
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virtual int GetCPU() const = 0; // 7 or 9 (currently, maybe also xtensa in the future?)
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// 0..14: as usual
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// 15: pc *pipeline-corrected*
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// 16: cpsr
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virtual u32 ReadReg (Register reg) = 0;
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virtual void WriteReg(Register reg, u32 value) = 0;
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virtual u32 ReadMem (u32 addr, int len) = 0;
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virtual void WriteMem(u32 addr, int len, u32 value) = 0;
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virtual void ResetGdb() = 0;
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virtual int RemoteCmd(const u8* cmd, size_t len) = 0;
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};
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enum class StubState
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{
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NoConn,
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None,
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Break,
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Continue,
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Step,
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Disconnect,
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Attach,
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CheckNoHit
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};
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enum class ReadResult
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{
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NoPacket,
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Eof,
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CksumErr,
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CmdRecvd,
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Wut,
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Break
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};
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enum class ExecResult
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{
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Ok,
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UnkCmd,
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NetErr,
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InitialBreak,
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MustBreak,
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Detached,
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Step,
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Continue
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};
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class GdbStub;
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typedef ExecResult (*GdbProtoCmd)(GdbStub* stub, const u8* cmd, ssize_t len);
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struct SubcmdHandler
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{
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char MainCmd;
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const char* SubStr;
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GdbProtoCmd Handler;
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};
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struct CmdHandler
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{
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char Cmd;
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GdbProtoCmd Handler;
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};
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class GdbStub
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{
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public:
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struct BpWp
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{
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public:
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u32 addr, len;
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int kind;
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};
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GdbStub(StubCallbacks* cb, int port);
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~GdbStub();
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bool Init();
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void Close();
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StubState Poll(bool wait = false);
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void SignalStatus(TgtStatus stat, u32 arg);
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StubState Enter(bool stay, TgtStatus stat=TgtStatus::NoEvent, u32 arg=~(u32)0u, bool wait_for_conn=false);
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// kind: 2=thumb, 3=thumb2 (not relevant), 4=arm
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void AddBkpt(u32 addr, int kind);
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void DelBkpt(u32 addr, int kind);
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// kind: 2=read, 3=write, 4=rdwr
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void AddWatchpt(u32 addr, u32 len, int kind);
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void DelWatchpt(u32 addr, u32 len, int kind);
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void DelAllBpWp();
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StubState CheckBkpt(u32 addr, bool enter, bool stay);
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StubState CheckWatchpt(u32 addr, int kind, bool enter, bool stay);
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#include "GdbCmds.h"
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Gdb::ExecResult SubcmdExec(const u8* cmd, ssize_t len, const SubcmdHandler* handlers);
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Gdb::ExecResult CmdExec(const CmdHandler* handlers);
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public:
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int SendAck();
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int SendNak();
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int Resp(const u8* data1, size_t len1, const u8* data2 = NULL, size_t len2 = 0);
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int RespC(const char* data1, size_t len1, const u8* data2 = NULL, size_t len2 = 0);
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#if defined(__GCC__) || defined(__clang__)
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__attribute__((__format__(printf, 2, 3)))
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#endif
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int RespFmt(const char* fmt, ...);
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int RespStr(const char* str);
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private:
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void Disconnect();
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StubState HandlePacket();
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private:
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StubCallbacks* Cb;
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//struct sockaddr_in server, client;
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void *ServerSA, *ClientSA;
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int Port;
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int SockFd;
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int ConnFd;
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TgtStatus Stat;
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u32 CurBkpt, CurWatchpt;
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bool StatFlag;
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bool NoAck;
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std::map<u32, BpWp> BpList;
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std::vector<BpWp> WpList;
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static SubcmdHandler Handlers_v[];
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static SubcmdHandler Handlers_q[];
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static SubcmdHandler Handlers_Q[];
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static CmdHandler Handlers_top[];
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};
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}
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#endif
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