Get call stack problem

RE: Get call stack problem

hmolesworth — Fri, 13 Dec 2019 17:36:23 GMT

You're welcome. As a follow up for SES users (don't have Keil)

 // GET_SP() in compiler_abstraction.h; __get_MSP() in cmsis_gcc.h
 NRF_LOG_INFO("nRF52832 SP 0x%08X, MSP 0x%08X, ", GET_SP(), __get_MSP());
and   
 NRF_LOG_INFO("nRF52832 SP 0x%08X, LR 0x%08X, PC 0x%08X, ", get_sp(), get_lr(), __get_PSP());

assuming:
static inline uint32_t get_sp(void)
{
    register uint32_t spRegister __ASM("sp");
    return spRegister;
}

static inline uint32_t get_lr(void)
{
    register uint32_t lrRegister __ASM("lr");
    return lrRegister;
}

Produces from main.c:

<info> app: nRF52832 SP 0x2000FFE0, MSP 0x2000FFE0,

and from a called function in the latter case:

<info> app: nRF52832 SP 0x2000FFA8, LR 0x00031631, PC 0x00000000,

RE: Get call stack problem

Sigurd — Fri, 13 Dec 2019 11:45:39 GMT

You can try looking up where the function is located with arm-none-eabi-addr2line, and with the LR value and .axf file as input (.axf is generated when you compile the Keil project)

arm-none-eabi-addr2line -e nrf52832_xxaa.axf 0x00001A61

You will then get the name of the .c file and line-number.

e.g. ..\..\..\..\..\..\components\libraries\queue\/nrf_queue.c:451

RE: Get call stack problem

outspace — Fri, 13 Dec 2019 02:49:11 GMT

Hi, hmolesworth

Thank you for your answer,Others gave me the answer

RE: Get call stack problem

outspace — Fri, 13 Dec 2019 02:47:23 GMT

Hi,Sigurd

Thank you very much for sharing. This is the answer I want. In addition, I would like to ask, is there any way to know the calling method of a function through code implementation in software? Similar to keil's call stack.

Thanks.

RE: Get call stack problem

hmolesworth — Thu, 12 Dec 2019 17:38:01 GMT

Not sure if it helps, but you can use cmsis_gcc.h to get info __get_PSP() and __get_MSP() for process and main stack pointers, plus other stuff.

RE: Get call stack problem

Sigurd — Thu, 12 Dec 2019 16:19:23 GMT

Hi,

With Keil you can do something like this to get the LR,PC and SP:

	unsigned int spReg, lrReg, pcReg;
    __asm
    {
        MOV spReg, __current_sp()
        MOV pcReg, __current_pc()
        MOV lrReg, __return_address()
    }
    NRF_LOG_INFO("SP = 0x%X\n",spReg);
    NRF_LOG_INFO("PC = 0x%X\n",pcReg);
    NRF_LOG_INFO("LR = 0x%X\n",lrReg);

Another approach, is to add a extra context variable in the function call.

Pseudo code:

#DEFINE FOO_FUCNTION 0x4242

func(var_1,var2,context)
{
    NRF_LOG_INFO(func caller: %d,context)
}


foo
{
     func(1,2,FOO_FUCNTION)

}