gdb 8.3.1 truncated register in remote g packet

Reinoud Koornstra reinoudkoornstra@gmail.com
Fri Nov 1 18:24:00 GMT 2019


On Fri, Nov 1, 2019 at 9:11 AM Luis Machado <luis.machado@linaro.org> wrote:

> Hi Reinoud,
>
> Hi Luis,
Thanks for your response.

>
> That error means your remote arm32 machine's debugging stub doesn't
> agree with GDB in terms of the register set. GDB is likely assuming
> register set A and the debugging stub is assuming register set B.
>
> You can check what the debugging stub is sending via "set debug remote
> 1". If it supports XML register descriptions, you'll see data flying by.
>
> If it doesn't, then GDB is probably making a guess as to what the proper
> register set is.
>
> In summary, i think we need more data in order to make an informer guess
> on what is going wrong here, but probably GDB and the debugging stub are
> not in sync in terms of registers.
>
 Here's more output with debug remote.
sudo gdb-for-arm/bin/arm-linux-gnueabihf-gdb ./vmlinux
GNU gdb (GDB) 8.3.1
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
>
This is free software: you are free to change and redistribute it.
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Type "show copying" and "show warranty" for details.
This GDB was configured as "--host=x86_64-pc-linux-gnu
--target=arm-linux-gnueabihf".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
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Reading symbols from ./vmlinux...
(gdb) set serial baud 115200
(gdb) set debug remote 1
(gdb) target remote /dev/ttyUSB4
Remote debugging using /dev/ttyUSB4
Sending packet:
$qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+#df...Ack
Packet received:
Packet qSupported (supported-packets) is NOT supported
Sending packet: $vMustReplyEmpty#3a...Ack
Packet received:
Sending packet: $Hg0#df...Ack
Packet received: OK
Sending packet: $qTStatus#49...Ack
Packet received:
Packet qTStatus (trace-status) is NOT supported
Sending packet: $?#3f...Ack
Packet received: S05
Sending packet: $qfThreadInfo#bb...Ack
Packet received:
mfffffffe,fffffffd,01,02,03,05,06,07,08,09,0a,0b,0c,0d,0e,0f,10,11,12
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m0147,014a,014c,0164,016f,0198,01a3,01a9,01dc,01ea,04b3,0502,0511,0512,0513,0514,0515
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m0523,0524,0525,0535,0540,0548,0614,098d,0992,0993,09bf,09c2,09c8,09cd,09ce,09db,09e1
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m09ea,09f7,09ff,0a36,0a3e,0a4b,0a51,0a57,0a58,0a5a,0a5b,0a5d,0a5e,0a5f,0aa4,0aa6,0aa8
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m0af2,0af3,0af4,0afa,0afc,0b7d,0b9a,0b9b,0b9c,0c1d,0cb8,0b96,0be9,0beb,0bf7,0bfb,0bfc
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m0bfd,0bfe,0bff,0c00,0c01,0c02,0c03,0c04,0c05,0c06,0c60,0c65,0c67,0c68,0c6d,0c6e,0c7c
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m0c7d,0c7f,0ce5,0df6,0e2f,0e39,0e3b,0e3d,0e5d,0e3e,0e3f,0e41,0e8c,0e8e,0ea3,0eaf,0ebc
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m0ebe,0ebf,0ec1,0ec2,0ec5,0ec7,0ec9,0ed0,0ed3,0ed4,0eca,0ecc,0ece,0ecf,0ed2,0edc,1061
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m1105,13fb,144c,145a,14b6,14c8,14cd,14e0,14f4,150b,1510,1511,1512,1514,1699,169b,169d
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m169e,169f,16a0,16a1,16a2,16cd,16cf,16d1,16d2,16d3,16d7,16dd,16de,16df,16e0,16e1,16e2
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m16e3,16e4,16e6,1961,1c81,1c82,1c83,1c84,1c85,1c86,1c87,16f2,16f3,16f5,16f6,16fc,1758
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m1759,175a,16f7,16f8,16fa,1704,1706,1719,1723,1724,1725,1734,1735,1741,1744,1747,1877
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m187b,187d,1880,188f,1893,193b,1949,194a,194f,1952,1957,1a78,1c75,1c77,1c9d,1eb4,1eb6
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
m1eb8,1ebe,29ed,0149,096c,1334,184d,1df6,1f3f,2123,2165,2175,2183
Sending packet: $qsThreadInfo#c8...Ack
Packet received:
Sending packet: $qAttached#8f...Ack
Packet received:
Packet qAttached (query-attached) is NOT supported
Sending packet: $Hc-1#09...Ack
Packet received: OK
Sending packet: $qC#b4...Ack
Packet received: QC0aa8
Sending packet: $qOffsets#4b...Ack
Packet received:
Sending packet: $g#67...Ack
Packet received:
0000000001000000b0829e80ac829e8054829880b4a698806700000013000060060000000000000000000000cc3e27bed03e27bec03e27be10200a80581f0a8000000000000000000000000000000000000000000000000000000000000000000000000000000000
Truncated register 19 in remote 'g' packet

>
>
Thanks, Reinoud.



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