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openocd -f "interface/stlink.cfg" -c "transport select hla_swd" -f "target/stm32g0x.cfg"
Open On-Chip Debugger 0.12.0-rc2+dev-00028-g9501b263e (2022-12-15-23:13)
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
hla_swd
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : clock speed 2000 kHz
Info : STLINK V2J37M27 (API v2) VID:PID 0483:374B
Info : Target voltage: 3.249836
Info : [stm32g0x.cpu] Cortex-M0+ r0p1 processor detected
Info : [stm32g0x.cpu] target has 4 breakpoints, 2 watchpoints
Info : starting gdb server for stm32g0x.cpu on 3333
Info : Listening on port 3333 for gdb connections
Info : accepting 'gdb' connection on tcp/3333
[stm32g0x.cpu] halted due to debug-request, current mode: Thread
xPSR: 0x81000000 pc: 0x080016ca msp: 0x200005a0
Info : device idcode = 0x10006467 (STM32G0B/G0Cx - Rev A : 0x1000)
Info : RDP level 0 (0xAA)
Info : flash size = 512 KiB
Info : flash mode : dual-bank
Info : device idcode = 0x10006467 (STM32G0B/G0Cx - Rev A : 0x1000)
Info : RDP level 0 (0xAA)
Info : OTP size is 1024 bytes, base address is 0x1fff7000

gdb-multiarch
(gdb) set arch arm
The target architecture is assumed to be arm
(gdb) target extended-remote localhost:3333
Remote debugging using localhost:3333
warning: No executable has been specified and target does not support
determining executable automatically.  Try using the "file" command.
0x080016ca in ?? ()
(gdb) info reg
r0             0x101337            1053495
r1             0x20                32
r2             0x0                 0
r3             0x0                 0
r4             0x32                50
r5             0x101328            1053480
r6             0x33                51
r7             0x3                 3
r8             0xffffffff          -1
r9             0xffffffff          -1
r10            0xffffffff          -1
r11            0xffffffff          -1
r12            0xf                 15
sp             0x200005a0          0x200005a0
lr             0x80016cb           134223563
pc             0x80016ca           0x80016ca
xPSR           0x81000000          -2130706432
msp            0x200005a0          0x200005a0
psp            0xfffffffc          0xfffffffc
primask        0x0                 0
basepri        0x0                 0
faultmask      0x0                 0
control        0x0                 0
(gdb)