When trying to debug with OpenOCD and GDB, the debugger is not working properly after breaking.
When setting a breakpoint (hardware or software) and continuing the execution GDB break correctly but then stepi do not advance the code pointer. This happens even when masking the interruptions.
When setting a breakpoint at a give line number in some code compiled with debug info and without optimization (-g -O0) GDB set the breakpoint to the beginning of the function regardless of the specified line number.
GNU gdb (GDB) 7.12
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Reading symbols from testproject/erts-9.2/bin/beam...done.
0x00400144 in ?? ()
force hard breakpoints
$1 = "Resetting target"
Reset, run bootloader and stop system
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x00400144 msp: 0x20401148
target halted due to watchpoint, current mode: Thread
xPSR: 0x21000000 pc: 0x0049ab3c psp: 0x732240c8
breakpoint set at 0x70000144
target halted due to breakpoint, current mode: Thread
xPSR: 0x61000000 pc: 0x70000144 psp: 0x73224140
Loading section .start, size 0x3f8 lma 0x70000000
Loading section .text, size 0x31f394 lma 0x70000400
Loading section .init, size 0xc lma 0x7031f794
Loading section .fini, size 0xc lma 0x7031f7a0
Loading section .rodata, size 0x2106b8 lma 0x7031f7c0
Loading section .ARM.exidx, size 0x8 lma 0x7052fe78
Loading section .eh_frame, size 0x4 lma 0x7052fe80
Loading section .init_array, size 0x4 lma 0x7052fe84
Loading section .fini_array, size 0x4 lma 0x7052fe88
Loading section .rtemsroset, size 0x878 lma 0x7052fe8c
Loading section .data, size 0x1ed8c lma 0x70530708
Loading section .rtemsrwset, size 0x3fd4 lma 0x7054f498
Start address 0x70000144, load size 5583944
Transfer rate: 126 KB/sec, 15685 bytes/write.
(gdb) set remote hardware-breakpoint-limit 8
(gdb) set remote hardware-watchpoint-limit 4
(gdb) hbreak ethr_thr_create:405
Hardware assisted breakpoint 1 at 0x702e80ea: file pthread/ethread.c, line 320.
(gdb) continue
Continuing.
Breakpoint 1, ethr_thr_create (tid=0x7055ff30 <sig_dispatcher_tid>, func=0x7013fe39 <signal_dispatcher_thread_func>, arg=0x0, opts=0x7061b034) at pthread/ethread.c:320
320 : -1 /* Use system default */);
(gdb) monitor cortex_m maskisr on
cortex_m interrupt mask on
(gdb) print $pc
$2 = (void (*)()) 0x702e80ea <ethr_thr_create+14>
(gdb) stepi
Breakpoint 1, ethr_thr_create (tid=0x7055ff30 <sig_dispatcher_tid>, func=0x7013fe39 <signal_dispatcher_thread_func>, arg=0x0, opts=0x7061b034) at pthread/ethread.c:320
320 : -1 /* Use system default */);
(gdb) print $pc
$3 = (void (*)()) 0x702e80ea <ethr_thr_create+14>
(gdb) stepi
Breakpoint 1, ethr_thr_create (tid=0x7055ff30 <sig_dispatcher_tid>, func=0x7013fe39 <signal_dispatcher_thread_func>, arg=0x0, opts=0x7061b034) at pthread/ethread.c:320
320 : -1 /* Use system default */);
(gdb) print $pc
$4 = (void (*)()) 0x702e80ea <ethr_thr_create+14>
(gdb) continue
Continuing.
Breakpoint 1, ethr_thr_create (tid=0x7055ff30 <sig_dispatcher_tid>, func=0x7013fe39 <signal_dispatcher_thread_func>, arg=0x0, opts=0x7061b034) at pthread/ethread.c:320
320 : -1 /* Use system default */);
(gdb) print $pc
$5 = (void (*)()) 0x702e80ea <ethr_thr_create+14>
(gdb) next
Breakpoint 1, ethr_thr_create (tid=0x7055ff30 <sig_dispatcher_tid>, func=0x7013fe39 <signal_dispatcher_thread_func>, arg=0x0, opts=0x7061b034) at pthread/ethread.c:320
320 : -1 /* Use system default */);
(gdb) print $pc
$6 = (void (*)()) 0x702e80ea <ethr_thr_create+14>
(gdb)
Open On-Chip Debugger 0.10.0
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
Info : FTDI SWD mode enabled
adapter speed: 1800 kHz
cortex_m reset_config sysresetreq
Info : flash bank command
srst_only separate srst_gates_jtag srst_open_drain connect_deassert_srst
adapter speed: 6000 kHz
basic initialization done
reset_and_run_bootloader
Info : clock speed 6000 kHz
Info : SWD DPIDR 0x0bd11477
Warn : Silicon bug: single stepping will enter pending exception handler!
Info : atsame70q21.cpu: hardware has 8 breakpoints, 4 watchpoints
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x00400144 msp: 0x20401148
Info : accepting 'gdb' connection on tcp/3333
Info : device id = 0xa1020e00
force hard breakpoints
Reset, run bootloader and stop system
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x00400144 msp: 0x20401148
target halted due to watchpoint, current mode: Thread
xPSR: 0x21000000 pc: 0x0049ab3c psp: 0x732240c8
breakpoint set at 0x70000144
target halted due to breakpoint, current mode: Thread
xPSR: 0x61000000 pc: 0x70000144 psp: 0x73224140
cortex_m interrupt mask on
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