DevHeads IoT Integration Server•4mo ago

I have discovered that it seems r0 is always set to 1, meaning INIT2 is never skipped.

Good day guys, this code here is part of the initialization code for a firmware of an STM32F030 microcontroller, disassembled using Radare2. It is executed after the clock initialization but before the heap setup.

0x0800335c      00f00bf8       bl fcn.08003376
0x08003360      0028           cmp r0, 0       
0x08003362      01d0           beq 0x8003368   
0x08003364      fff7d4ff       bl INIT2        
0x08003368      0020           movs r0, 0
[...]
0x08003376      0120           movs r0, 1      
0x08003378      7047           bx lr

0x0800335c      00f00bf8       bl fcn.08003376
0x08003360      0028           cmp r0, 0       
0x08003362      01d0           beq 0x8003368   
0x08003364      fff7d4ff       bl INIT2        
0x08003368      0020           movs r0, 0
[...]
0x08003376      0120           movs r0, 1      
0x08003378      7047           bx lr

I have discovered that it seems r0 is always set to 1, meaning INIT2 is never skipped. What am I missing? @Middleware & OS

3 Replies

Enthernet Code•4mo ago

What are you trying to do

Enthernet Code•4mo ago

From there we would know if u re Missing something

Sterling•4mo ago

Well, I am just trying to understand the control flow and conditions under which INIT2 is called.

Gaming

Programming

I have discovered that it seems r0 is always set to 1, meaning INIT2 is never skipped.