Unable to debug with Hardfault_Handler

[blueshifting]

nrf52832

SDK 14.2

My application is locking up, and finding the cause is proving to be difficult. I've enabled DEBUG and DEBUG_NRF and included the hardfault library from the SDK including the file for the compiler I'm using (GCC, hardfault_handler_gcc.c). I was hopeful seeing the calls to NRF_LOG_ERROR in Hardfault_c_handler() that I might get some information about what is happening, but best I can tell this function is never executed. 

Using Segger's Ozone debugger, I can tell that the call stack halts on <Hardfault_Exception> but no error messages are provided. I've attempted trying to override Hardfault_process() and explicitly generate hardfaults using hardfault_genhf.h functions, but no information is ever provided in RTT. Any ideas on what I'm missing?

[Håkon Alseth]

Hi,

 

We have a known issue with GCC in SDK v14.2, where the define "NRF_BREAKPOINT_COND" expands to __builtin_trap(), which fails with newlib-nano.

Here's the section in app_util_platform.h:

#if defined(__GNUC__)

#define NRF_BREAKPOINT __builtin_trap() // Expands to _exit()

 

Define this to a __NOP() or an actual breakpoint "__asm__("BKPT 0");", and the "app_error" assert handler (and the SDK hardfault handler library) should work normally with GCC.

Could you try this, and report back the fault-details?

 

Cheers,

Håkon

[blueshifting]

Hi Hakon, 

Thanks for your response. I've tried changing NRF_BREAKPOINT to either __NOP() or __asm__("BKPT 0"); but neither changes the behavior. 

Also, curiously, despite hardfault_implementation.c and hardfault_handler_gcc.c being included in the build and being compiled, it does not show up in the list of sources in Ozone's analysis of the .elf. This keeps me from putting a breakpoint in those files. 

*Addition*

I've enabled -frecord-gcc-switches to verify the following:

* hardfault and hardfault/nrf52/handler are being included (-I)

* -0g and -g3 GCC flags are set

* DEBUG and DEBUG_NRF are set

[Håkon Alseth]

 

I cannot spot anything that should provide issues debugging this library, based on your configuration and build files. Could you do a "make VERBOSE=1" just to see that the proper debug flags (optimization and debug level) are actually being passed to the compiler?

 

Cheers,

Håkon

[blueshifting]

➜  build git:(master) ✗ make clean
➜  build git:(master) ✗ make flash_basicapp_vka1_s132_5.0.0 -j8 VERBOSE=1 | grep hardfault_implementation
[ 39%] Building C object nrf5_sdk/14.2.0/CMakeFiles/NRF5_SDK_14.2.0_vka1.dir/components/libraries/hardfault/hardfault_implementation.c.obj
cd /Users/todd/Projects/myproject/build/nrf5_sdk/14.2.0 && /usr/local/bin/arm-none-eabi-gcc -DBOARD_VKAB010001 -DCONFIG_GPIO_AS_PINRESET -DDCONFIG_NFCT_PINS_AS_GPIOS -DDEBUG -DDEBUG_NRF -DNRF52 -DNRF52832 -DNRF52832_XXAA -DNRF52_SERIES -DNRF_SD_BLE_API_VERSION=5 -DS132 -DSD_BLE_API_VERSION=5 -DSOFTDEVICE_PRESENT -I/Users/todd/Projects/myproject/config -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/device -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/boards -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/toolchain -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/toolchain/cmsis/include -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/softdevice/common -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/softdevice/s132/headers -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_advertising -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_dtm -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_racp -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_ancs_c -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_ans_c -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_bas -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_bas_c -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_cscs -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_cts_c -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_dfu -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_dis -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_gls -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_hids -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_hrs -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_hrs_c -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_hts -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_ias -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_ias_c -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_lbs -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_lbs_c -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_lls -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_nus -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_services/ble_nus_c 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-I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/drivers_nrf/i2s -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/drivers_nrf/ppi -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/drivers_nrf/rtc -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/drivers_nrf/spi_master -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/drivers_nrf/timer -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/drivers_nrf/twi_master -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/drivers_nrf/uart -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/drivers_nrf/wdt -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/libraries/uart -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/libraries/atomic -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/libraries/atomic_fifo -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/libraries/balloc 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➜  build git:(master) ✗ make clean
➜  build git:(master) ✗ make flash_basicapp_vka1_s132_5.0.0 -j8 VERBOSE=1 | grep hardfault_handler_gcc
[ 40%] Building C object nrf5_sdk/14.2.0/CMakeFiles/NRF5_SDK_14.2.0_vka1.dir/components/libraries/hardfault/nrf52/handler/hardfault_handler_gcc.c.obj
cd /Users/todd/Projects/myproject/build/nrf5_sdk/14.2.0 && /usr/local/bin/arm-none-eabi-gcc -DBOARD_VKAB010001 -DCONFIG_GPIO_AS_PINRESET -DDCONFIG_NFCT_PINS_AS_GPIOS -DDEBUG -DDEBUG_NRF -DNRF52 -DNRF52832 -DNRF52832_XXAA -DNRF52_SERIES -DNRF_SD_BLE_API_VERSION=5 -DS132 -DSD_BLE_API_VERSION=5 -DSOFTDEVICE_PRESENT -I/Users/todd/Projects/myproject/config -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/device -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/boards -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/toolchain -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/toolchain/cmsis/include -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/softdevice/common -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/softdevice/s132/headers -I/Users/todd/Projects/myproject/nrf5_sdk/14.2.0/components/ble/ble_advertising 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[Håkon Alseth]

Everything looks normal. I see that you're creating a full library, then most likely linking a .elf based on the library. This is the only step I can see that differs.

Does the .elf file list this as a function at all?

You can check using objdump:

$ arm-none-eabi-objdump <my.elf> -t | grep HardFault

This should list them as functions:
00025fde l .text 00000000 HardFault_Handler_Continue
00025fd8 l .text 00000000 HardFault_MoveSP
00025fbc g F .text 00000040 HardFault_Handler
00025eac g F .text 00000110 HardFault_c_handler
00025e88 w F .text 00000024 HardFault_process

If that is not present as functions in your .elf file, I suspect there's some forced inlining happening under-the-hood, or some stripping of debug information due to the .o -> .a -> .elf. Here's a thread on stackoverflow which shows issues with the "naked" keyword when using a static library: https://stackoverflow.com/questions/30355013/linking-with-static-library-not-equivalent-to-linking-with-its-objects

 

If the .elf does not have the above mentioned functions, could you try skipping the "create library" part of your build?

 

Cheers,

Håkon

[blueshifting]

I think your suspicion is correct:

arm-none-eabi-objdump basicapp_vka1_s132_5.0.0.elf -t | grep HardFault
00023822  w    F .text	00000002 HardFault_Handler

vs

arm-none-eabi-objdump libNRF5_SDK_14.2.0_vka1.a -t | grep HardFault
00000000 l    d  .text.HardFault_process	00000000 .text.HardFault_process
00000000 l    d  .text.HardFault_c_handler	00000000 .text.HardFault_c_handler
00000000 l    d  .rodata.HardFault_c_handler.str1.4	00000000 .rodata.HardFault_c_handler.str1.4
00000000  w    F .text.HardFault_process	00000024 HardFault_process
00000000 g     F .text.HardFault_c_handler	00000118 HardFault_c_handler
00000004       O *COM*	00000004 HardFault_p_stack
00000000 l    d  .text.HardFault_Handler	00000000 .text.HardFault_Handler
00000022 l       .text.HardFault_Handler	00000000 HardFault_Handler_Continue
0000001c l       .text.HardFault_Handler	00000000 HardFault_MoveSP
00000000 g     F .text.HardFault_Handler	00000040 HardFault_Handler
00000000         *UND*	00000000 HardFault_c_handler

I'll work on doing it without the library.

[blueshifting]

Including the SDK instead of building it as a library works.