gdbscript

# -*- GDB-Script -*-
# "file" should place before "target"
# gdb-multiarch -x gdbscript

set debug arm

build/zephyr/zephyr.elf
target remote localhost:3333

#        breakpoint 1
# west/modules/lib/gui/lvgl/src/lv_misc/lv_task.c
# if(lv_task_exec(LV_GC_ROOT(_lv_task_act)))
b lv_task.c:142

#        breakpoint 2
# zephyr/drivers/i2c/i2c_ll_stm32.c
# k_sem_give(&data->bus_mutex);
# # where the program stops
b i2c_ll_stm32.c:167

#        breakpoint 3
b z_arm_usage_fault

#        breakpoint 4
b fault.c:1004

#        breakpoint 5
b zephyr/arch/arm/core/aarch32/swap.c:41

#        breakpoint 6

# command
# stop 2 times at breakpoint 1 and continue until the last function before 
disable
enable 1
c

enable
c
c
c

# DWT_CTRL bit 17, CPIEVTENA, Enables CPI count event.
# set *0xE0001000=(*0xE0001000) & (0x20000)
set *0xE0001000 = 0x20001
# reset DWT_CYCCNT value, Cycle count register
set *0xE0001004 = (long int)0x0
# DWT_CPICNT, Instruction cycle count event register
set *0xE0001008 = (long int)0x0

# press c again to enter the fault and check the clock count
# it's 90 on my computer
# c
# p/d *0xE0001004