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implement gdb remote protocol debugger #10

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wwiv opened this issue Jul 12, 2021 · 3 comments
Open

implement gdb remote protocol debugger #10

wwiv opened this issue Jul 12, 2021 · 3 comments

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@wwiv
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wwiv commented Jul 12, 2021

With the start of the lame debugger, we can listen on a socket already. Here's what we get when we attempt to attach the GDB debugger to the lame debugger port:

2021-07-12 11:56:56,596 INFO  Listening to LAME_DEBUGGER on port: 2112
LameDebugger: +$qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a$qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a$qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a$qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a
2021-07-12 11:57:09,156 INFO  LameDebugger::handle_line; cmd: +$qsupported:multiprocess+;swbreak+;hwbreak+;qrelocinsn+;fork-events+;vfork-events+;exec-events+;vcontsupported+;qthreadevents+;no-resumed+;xmlregisters=i386#6a$qsupported:multiprocess+;swbreak+;hwbreak+;qrelocinsn+;fork-events+;vfork-events+;exec-events+;vcontsupported+;qthreadevents+;no-resumed+;xmlregisters=i386#6a$qsupported:multiprocess+;swbreak+;hwbreak+;qrelocinsn+;fork-events+;vfork-events+;exec-events+;vcontsupported+;qthreadevents+;no-resumed+;xmlregisters=i386#6a$qsupported:multiprocess+;swbreak+;hwbreak+;qrelocinsn+;fork-events+;vfork-events+;exec-events+;vcontsupported+;qthreadevents+;no-resumed+;xmlregisters=i386#6a; data:
LameDebugger: -
2021-07-12 11:57:13,150 INFO  LameDebugger::handle_line; cmd: -; data:
LameDebugger: -
2021-07-12 11:57:15,312 INFO  LameDebugger::handle_line; cmd: -; data:
LameDebugger: -+$vMustReplyEmpty#3a$vMustReplyEmpty#3a
2021-07-12 11:57:19,290 INFO  LameDebugger::handle_line; cmd: -+$vmustreplyempty#3a$vmustreplyempty#3a; data:
LameDebugger: $vMustReplyEmpty#3a
2021-07-12 11:57:21,368 INFO  LameDebugger::handle_line; cmd: $vmustreplyempty#3a; data:
LameDebugger: $vMustReplyEmpty#3a
2021-07-12 11:57:23,417 INFO  LameDebugger::handle_line; cmd: $vmustreplyempty#3a; data:
LameDebugger: -
2021-07-12 11:57:27,352 INFO  LameDebugger::handle_line; cmd: -; data:
LameDebugger: -
2021-07-12 11:57:29,416 INFO  LameDebugger::handle_line; cmd: -; data:
LameDebugger: -+
2021-07-12 11:57:29,419 INFO  LameDebugger::handle_line; cmd: -+; data:
2021-07-12 11:57:29,421 ERROR empty line. client disconnected?
@wwiv
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wwiv commented Jul 14, 2021

Here's a good example with gdbserver

Remote debugging using localhost:2112
Sending packet: $qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a...Ack
Packet received: PacketSize=47ff;QPassSignals+;QProgramSignals+;QStartupWithShell+;QEnvironmentHexEncoded+;QEnvironmentReset+;QEnvironmentUnset+;QSetWorkingDir+;QCatchSyscalls+;qXfer:libraries-svr4:read+;augmented-libraries-svr4-read+;qXfer:auxv:read+;qXfer:spu:read+;qXfer:spu:write+;qXfer:siginfo:read+;qXfer:siginfo:write+;qXfer:features:read+;QStartNoAckMode+;qXfer:osdata:read+;multiprocess+;fork-events+;vfork-events+;exec-events+;QNonStop+;QDisableRandomization+;qXfer:threads:read+;ConditionalTracepoints+;TraceStateVaria
Packet qSupported (supported-packets) is supported
Sending packet: $vMustReplyEmpty#3a...Ack
Packet received:
Sending packet: $QStartNoAckMode#b0...Ack
Packet received: OK
Sending packet: $QProgramSignals:0;1;3;4;6;7;8;9;a;b;c;d;e;f;10;11;12;13;14;15;16;17;18;19;1a;1b;1c;1d;1e;1f;20;21;22;23;24;25;26;27;28;29;2a;2b;2c;2d;2e;2f;30;31;32;33;34;35;36;37;38;39;3a;3b;3c;3d;3e;3f;40;41;42;43;44;45;46;47;48;49;4a;4b;4c;4d;4e;4f;50;51;52;53;54;55;56;57;58;59;5a;5b;5c;5d;5e;5f;60;61;62;63;64;65;66;67;68;69;6a;6b;6c;6d;6e;6f;70;71;72;73;74;75;76;77;78;79;7a;7b;7c;7d;7e;7f;80;81;82;83;84;85;86;87;88;89;8a;8b;8c;8d;8e;8f;90;91;92;93;94;95;96;97;#75...Packe
t received: OK
Sending packet: $Hgp0.0#ad...Packet received: OK
Sending packet: $qXfer:features:read:target.xml:0,fff#7d...Packet received: m<?xml version="1.0"?>\n<!DOCTYPE target SYSTEM "gdb-target.dtd">\n<target>\n<architecture>i386:x86-64</architecture>\n<osabi>GNU/Linux</osabi><feature name="org.gnu.gdb.i386.core">\n<flags id="i386_eflags" size="4">\n  <field name="CF" start="0" end="0"/>\n  <field name="" start="1"
 end="1"/>\n  <field name="PF" start="2" end="2"/>\n  <field name="AF" start="4" end="4"/>\n  <field name="ZF" start="6" end="6"/>\n  <field name="SF" start="7" end="7"/>\n  <field name="TF" start="8" end="8"/>\n  <field name="IF" start="9" [13 bytes omitted]
Sending packet: $qXfer:features:read:target.xml:fff,1000#0e...Packet received: lield name="UE" start="4" end="4"/>\n  <field name="PE" start="5" end="5"/>\n  <field name="DAZ" start="6" end="6"/>\n  <field name="IM" start="7" end="7"/>\n  <field name="DM" start="8" end="8"/>\n  <field name="ZM" start="9" end="9"/>\n  <field name="OM" start="10" end="10"/>\n  <field name="UM" start="11" end="11"/>\n  <field name="PM" start="12" end="12"/>\n  <field name="FZ" start="15" end="15"/>\n</flags>\n<reg name="xmm0" bitsize="128" type="vec128" regnum="40"/>\n<reg name="xmm1" bitsize="128" type="vec128" reg[12 bytes omitted]
warning: A handler for the OS ABI "GNU/Linux" is not built into this configuration
of GDB.  Attempting to continue with the default i386:x86-64 settings.

warning: Architecture rejected target-supplied description
Sending packet: $QNonStop:0#8c...Packet received: OK
Sending packet: $qTStatus#49...Packet received: T0;tnotrun:0;tframes:0;tcreated:0;tfree:500000;tsize:500000;circular:0;disconn:0;starttime:0;stoptime:0;username:;notes::
Packet qTStatus (trace-status) is supported
Sending packet: $qTfV#81...Packet received: 1:0:1:74726163655f74696d657374616d70
Sending packet: $qTsV#8e...Packet received: l
Sending packet: $?#3f...Packet received: T0506:0000000000000000;07:10e4ffffff7f0000;10:9060fdf7ff7f0000;thread:p2937.2937;core:4;
Sending packet: $qXfer:threads:read::0,fff#03...Packet received: l<threads>\n<thread id="p2937.2937" core="4" name="vi"/>\n</threads>\n
Sending packet: $qAttached:2937#9e...Packet received: 0
Packet qAttached (query-attached) is supported
Sending packet: $qXfer:exec-file:read:2937:0,fff#5f...Packet received: l/usr/bin/vim.basic
Sending packet: $vFile:setfs:0#bf...Packet received: F0
Packet vFile:setfs (hostio-setfs) is supported
Sending packet: $vFile:open:6a7573742070726f62696e67,0,1c0#ed...Packet received: F-1,2
Packet vFile:open (hostio-open) is supported
Reading /usr/bin/vim.basic from remote target...
warning: File transfers from remote targets can be slow. Use "set sysroot" to access files locally instead.
Sending packet: $vFile:setfs:2937#64...Packet received: F0
Sending packet: $vFile:open:2f7573722f62696e2f76696d2e6261736963,0,0#6b...Packet received: F5
Sending packet: $vFile:fstat:5#c1...Packet received: F40;\000\000\b\020\000\000ß\021\000\000\201í\000\000\000\001\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000)Cè\000\000\000\000\000\000\020\000\000\000\000\000\000\000\024"`ìSP]\005\037«`Aß
Packet vFile:fstat (hostio-fstat) is supported
Sending packet: $vFile:fstat:5#c1...Packet received: F40;\000\000\b\020\000\000ß\021\000\000\201í\000\000\000\001\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000)Cè\000\000\000\000\000\000\020\000\000\000\000\000\000\000\024"`ìSP]\005\037«`Aß
Sending packet: $vFile:fstat:5#c1...Packet received: F40;\000\000\b\020\000\000ß\021\000\000\201í\000\000\000\001\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000)Cè\000\000\000\000\000\000\020\000\000\000\000\000\000\000\024"`ìSP]\005\037«`Aß
readahead cache miss 1
Sending packet: $vFile:pread:5,47ff,0#6a...Packet received: F47e8;\177ELF\002\001\001\000\000\000\000\000\000\000\000\000\003\000>\000\001\000\000\000A·\002\000\000\000\000\000@\000\000\000\000\000\000\000è<)\000\000\000\000\000\000\000\000\000@\0008\000\013\000@\000\034\000\e\000\006\000\000\000\004\000\000\000@\000\000\000\000\000\000\000@\000\000\000\000\000\000\000@\000\000\000\000\000\000\000h\002\000\000\000\000\000\000h\002\000\000\000\000\000\000\b\000\000\000\000\000\000\000\003\000\000\000\004\000\000\000"\002\000\000\000\000\000\000"\002\000\000\000\000\000\000"\002\000\000\000\000\000\000\034\000\000\000\000\000\000\000\034\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000\001\000\000\000\004\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\206\002\000\000\000\000\000\000\206\002\000\000\000\000\000\000\020\000\000\000\000\000\000\001\000\000\000\005\000\000\000\000\220\002\000\000\000\000\000\000\220\002\000\000\000\000\000\000\220\002\000\000\000\000\000\235\n\036\000\000\000\000\000\235\n\036\000\000\000\000\000\000\020\000\000\000\000\000\000\001\000\000\000\004\000\000\000\000  \000\000\000\000\000\000  \000\000\000\000\000\000  \000\000\000\000\00080\006\000\000\000\000\00080\006\000\000\000\000\000\000\020\000\000\000\000\000\000\001\000\000\000\006\000\000\000\220x&\000\000\000\000\000\220ç&\000\000\000\000\000\220ç&\000\000\
000\000\000 d\002\000\000\000\000\000H\030\003\000\000\000\000\000\000\020\000\000\000\000\000\000\002\000\000\000\006\000\000\000\230\226'\000\000\000\000\000\230▌'\000\000\000\000\000\230▌'\000\000\000\000\000P\002\000\000\000\000\000\000P\002\000\000\000\000\000\000\b\000\000\000\000\000\000\000\004\000\000\000\004\000\000\000Ä\002\000\000\000\000\000\000Ä\002\000\000\000\000\000\000Ä\002\000\000\000\000\000\000D\000\000\000\000\000\000\000D\000\000\000\000\000\000\000\004\000[1352 bytes omitted]
Packet vFile:pread (hostio-pread) is supported
readahead cache hit 1
readahead cache hit 2
readahead cache hit 3
readahead cache hit 4
readahead cache hit 5
readahead cache hit 6
readahead cache hit 7
readahead cache hit 8
readahead cache hit 9
readahead cache hit 10
Sending packet: $vFile:close:5#b5...Packet received: F0
Packet vFile:close (hostio-close) is supported
warning: "target:/usr/bin/vim.basic": not in executable format: File format not recognized
Reading /usr/bin/vim.basic from remote target...
Sending packet: $vFile:open:2f7573722f62696e2f76696d2e6261736963,0,0#6b...Packet received: F5
Sending packet: $vFile:fstat:5#c1...Packet received: F40;\000\000\b\020\000\000ß\021\000\000\201í\000\000\000\001\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000)Cè\000\000\000\000\000\000\020\000\000\000\000\000\000\000\024"`ìSP]\005\037«`Aß
Sending packet: $vFile:fstat:5#c1...Packet received: F40;\000\000\b\020\000\000ß\021\000\000\201í\000\000\000\001\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000)Cè\000\000\000\000\000\000\020\000\000\000\000\000\000\000\024"`ìSP]\005\037«`Aß
Sending packet: $vFile:fstat:5#c1...Packet received: F40;\000\000\b\020\000\000ß\021\000\000\201í\000\000\000\001\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000)Cè\000\000\000\000\000\000\020\000\000\000\000\000\000\000\024"`ìSP]\005\037«`Aß
readahead cache miss 2
Sending packet: $vFile:pread:5,47ff,0#6a...Packet received: F47e8;\177ELF\002\001\001\000\000\000\000\000\000\000\000\000\003\000>\000\001\000\000\000A·\002\000\000\000\000\000@\000\000\000\000\000\000\000è<)\000\000\000\000\000\000\000\000\000@\0008\000\013\000@\000\034\000\e\000\006\000\000\000\004\000\000\000@\000\000\000\000\000\000\000@\000\000\000\000\000\000\000@\000\000\000\000\000\000\000h\002\000\000\000\000\000\000h\002\000\000\000\000\000\000\b\000\000\000\000\000\000\000\003\000\000\000\004\000\000\000"\002\000\000\000\000\000\000"\002\000\000\000\000\000\000"\002\000\000\000\000\000\000\034\000\000\000\000\000\000\000\034\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000\001\000\000\000\004\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\206\
002\000\000\000\000\000\000\206\002\000\000\000\000\000\000\020\000\000\000\000\000\000\001\000\000\000\005\000\000\000\000\220\002\000\000\000\000\000\000\220\002\000\000\000\000\000\000\220\002\000\000\000\000\000\235\n\036\000\000\000\000\000\235\n\036\000\000\000\000\000\000\020\000\000\000\000\000\000\001\000\000\000\004\000\000\000\000  \000\000\000\000\000\000  \000\000\000\000\000\000  \000\000\000\000\00080\006\000\000\000\000\00080\006\000\000\000\000\000\000\020\000\000\000\000\000\000\001\000\000\000\006\000\000\000\220x&\000\000\000\000\000\220ç&\000\000\000\000\000\220ç&\000\000\000\000\000 d\002\000\000\000\000\000H\030\003\000\000\000\000\000\000\020\000\000\000\000\000\000\002\000\000\000\006\000\000\000\230\226'\000\000\000\000\000\230▌'\000\000\000\000\000\230▌'\000\000\000\000\000P\002\000\000\000\000\000\000P\002\000\000\000\000\000\000\b\000\000\000\000\000\000\000\004\000\000\000\004\000\000\000Ä\002\000\000\000\000\000\000Ä\002\000\000\000\000\000\000Ä\002\000\000\000\000\000\000D\000\000\000\000\000\000\000D\000\000\000\000\000\000\000\004\000[1352 bytes omitted]
readahead cache hit 11
readahead cache hit 12
readahead cache hit 13
readahead cache hit 14
readahead cache hit 15
readahead cache hit 16
readahead cache hit 17
readahead cache hit 18
readahead cache hit 19
readahead cache hit 20
Sending packet: $vFile:close:5#b5...Packet received: F0
warning: `target:/usr/bin/vim.basic': can't read symbols: File format not recognized.
Sending packet: $Hc-1#09...Packet received: E01
Remote register badly formatted: T0506:0000000000000000;07:10e4ffffff7f0000;10:9060fdf7ff7f0000;thread:p2937.2937;core:4;
here: 00000000;07:10e4ffffff7f0000;10:9060fdf7ff7f0000;thread:p2937.2937;core:4;

@wwiv
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wwiv commented Jul 14, 2021 •
edited
Loading

and here's how to attach

set debug remote 1
target remote host:port

@wwiv
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wwiv commented Jul 14, 2021

This much works now:

0x00008901 in ?? ()
(gdb) i r
eax            0x0      0
ecx            0x1      1
edx            0x0      0
ebx            0x26c    620
esp            0xc6a    0xc6a
ebp            0x0      0x0
esi            0x0      0
edi            0x0      0
eip            0x8901   0x8901
eflags         0x44     [ PF ZF ]

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@wwiv