Wrong register names when remote debugging

Eric Floehr eric@floehr.com
Wed May 13 19:15:43 GMT 2020


Well that was silly :-)

The problem was I was still running the non-multiarch "gdb" versus
"gdb-multiarch" command.

Changing to running "gdb-multiarch" solved the problem.

Cheers,
Eric

On Wed, May 13, 2020 at 11:41 AM Eric Floehr <eric@floehr.com> wrote:

> Hi,
>
> Running Ubuntu 20.04 with st-util and gdb-multiarch. I am new to remote
> debugging with gdb, but examples show correct register names. When I
> connect remotely I see the correct register values, but with x86 register
> names:
>
> st-util output:
> st-util 1.6.0
> 2020-05-13T11:28:43 INFO common.c: Loading device parameters....
> 2020-05-13T11:28:43 INFO common.c: Device connected is: F303 high density
> device, id 0x10036446
> 2020-05-13T11:28:43 INFO common.c: SRAM size: 0x10000 bytes (64 KiB),
> Flash: 0x80000 bytes (512 KiB) in pages of 2048 bytes
> 2020-05-13T11:28:43 INFO gdb-server.c: Chip ID is 00000446, Core ID is
>  2ba01477.
> 2020-05-13T11:28:43 INFO gdb-server.c: Listening at *:4242...
> 2020-05-13T11:28:59 INFO gdb-server.c: Found 6 hw breakpoint registers
> 2020-05-13T11:28:59 INFO gdb-server.c: GDB connected.
> 2020-05-13T11:30:06 ERROR gdb-server.c: cannot recv: -2
> 2020-05-13T11:30:06 INFO gdb-server.c: Listening at *:4242...
>
> gdb connection:
> GNU gdb (Ubuntu 9.1-0ubuntu1) 9.1
> Copyright (C) 2020 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <
> http://gnu.org/licenses/gpl.html>
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> For help, type "help".
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> (gdb) target extended-remote :4242
> Remote debugging using :4242
> warning: No executable has been specified and target does not support
> determining executable automatically.  Try using the "file" command.
> 0x00000000 in ?? ()
> (gdb) load main.elf
> Loading section .text, size 0x1c lma 0x8000000
> Start address 0x08000000, load size 28
> Transfer rate: 208 bytes/sec, 28 bytes/write.
> (gdb) continue
> Continuing.
> ^C
> Program received signal SIGTRAP, Trace/breakpoint trap.
> 0x00000000 in ?? ()
> (gdb) info registers
> eax            0x1cb5d1            1881553
> ecx            0x0                 0
> edx            0x0                 0
> ebx            0x0                 0
> esp            0x0                 0x0
> ebp            0x0                 0x0
> esi            0x0                 0
> edi            0xdeadbeef          -559038737
> eip            0x0                 0x0
> eflags         0x0                 [ ]
> cs             0x0                 0
> ss             0x0                 0
> ds             0x0                 0
> es             0x20080000          537395200
> fs             0xffffffff          -1
> gs             0x8000010           134217744
> (gdb)
>
> Any thoughts on what is going on?
>
> Thanks!
> Eric
>
>
>
>


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