mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-07-17 17:37:30 +02:00
Kevin Thomas
42 lines
1.6 KiB
Markdown
42 lines
1.6 KiB
Markdown
# Embedded Systems Reverse Engineering
|
|
[Repository](https://github.com/mytechnotalent/Embedded-Hacking)
|
|
|
|
## Week 1
|
|
Introduction and Overview of Embedded Reverse Engineering: Ethics, Scoping, and Basic Concepts
|
|
|
|
### Non-Credit Practice Exercise 1 Solution: Explore in Ghidra
|
|
|
|
#### Answers
|
|
|
|
##### Question 1: What does the function return?
|
|
`stdio_init_all()` returns `_Bool`. The function signature is `_Bool stdio_init_all(void)`.
|
|
|
|
##### Question 2: What parameters does it take?
|
|
None. The signature uses `(void)`, which means zero parameters.
|
|
|
|
##### Question 3: What functions does it call?
|
|
In this build, it calls `stdio_uart_init()` to initialize serial output.
|
|
|
|
##### Question 4: What's the purpose?
|
|
Its purpose is to initialize standard I/O so `printf()`/`puts()` output can be transmitted over UART.
|
|
|
|
##### Expected Output
|
|
|
|
```
|
|
stdio_init_all() returns: _Bool
|
|
It takes 0 parameters
|
|
It calls the following functions: UART init
|
|
Based on these calls, I believe it initializes: Standard I/O for UART serial communication
|
|
```
|
|
|
|
#### Reflection Answers
|
|
|
|
1. **Why would we need to initialize standard I/O before using `printf()`?**
|
|
Without initialization, there is no configured output path. `printf()` needs a destination (UART in this exercise) to transmit characters.
|
|
|
|
2. **Can you find other functions in the Symbol Tree that might be related to I/O?**
|
|
Yes - `stdio_uart_init`, `__wrap_puts`, and related low-level serial/output helpers are I/O-related.
|
|
|
|
3. **How does this function support the `printf("hello, world\r\n")` call in main?**
|
|
It configures the UART output path so when `printf()` (optimized to `__wrap_puts`) runs, the string is sent over serial.
|