TM4C1294KCPDT: Reading core registers in code

Hang Yang

Part Number: TM4C1294KCPDT

Tool/software:

Hi experts,

Could you please help providing couple lines of example that read the core registers into a variable? for example the SP register.

Thanks,

Hang.

6 months ago

0 Charles Tsai 6 months ago

TI__Guru**** 191906 points

Hi Hang,

See below example. The SP is loaded with the content at address pointed by R0. The R0 is later loaded with the value at address APP_START_ADDRESS + 4.

;;
;; Load the stack pointer from the application's vector table.
;;
movw r0, #(APP_START_ADDRESS & 0xffff)
movt r0, #(APP_START_ADDRESS >> 16)

ldr sp, [r0]

;;
;; Load the initial PC from the application's vector table and branch to
;; the application's entry point.
;;
ldr r0, [r0, #4]
bx r0

0 Hang Yang 6 months ago in reply to Charles Tsai

TI__Expert 3051 points

Hi Charles,

Thanks for the example. How I can put them in C environment?

0 Charles Tsai 6 months ago in reply to Hang Yang

TI__Guru**** 191906 points

You can embed assembly code inside C code like below example.

asm(" ldr sp, [r0]);

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TM4C1294KCPDT: Reading core registers in code