Configuring the Stack Pointer in the Bare Metal Rust Bootloader

Configuring the Stack Pointer in an x86 Bootloader Using Rust

Rust with Inline Assembly

#![no_std]
#![no_main]
#[no_mangle]
fn entry() -> ! {
    // Set the stack pointer to 0x7c00
    unsafe {
        core::arch::asm!(
            "mov sp, 0x7c00",
            options(nostack)
        );
    }
    // Define local variables
    let bootloader_variable_1 = 42;
    let bootloader_variable_2 = 84;
    // Your bootloader logic here
    loop {}
}

Maintaining stable stack pointers in the Rust bootloader

Assembly with Rust Integration

global _start
section .text
_start:
    cli                 ; Clear interrupts
    mov sp, 0x7c00      ; Set stack pointer
    call rust_entry     ; Call Rust entry point
section .data
section .bss
extern rust_entry

How to set the stack pointer in Rust using inline assembly.

Common Questions Regarding Bare Metal Rust Stack Pointer Configuration

#![no_std]
#![no_main]
#[no_mangle]
fn entry() -> ! {
    unsafe {
        asm!(
            "mov sp, 0x7c00",
            options(noreturn)
        );
    }
    let _var1 = 123;
    let _var2 = 456;
    loop {}
}

Common Questions Regarding Bare Metal Rust Stack Pointer Configuration

1. Common Questions Regarding Bare Metal Rust Stack Pointer Configuration
2. Common Questions Regarding Bare Metal Rust Stack Pointer Configuration
3. Common Questions Regarding Bare Metal Rust Stack Pointer Configuration
4. Common Questions Regarding Bare Metal Rust Stack Pointer Configuration
5. Common Questions Regarding Bare Metal Rust Stack Pointer Configuration
6. Common Questions Regarding Bare Metal Rust Stack Pointer Configuration
7. Common Questions Regarding Bare Metal Rust Stack Pointer Configuration
8. Common Questions Regarding Bare Metal Rust Stack Pointer Configuration
9. What function does 5 serve in inline assembly?
10. To avoid conflicts, it alerts the compiler that the assembly code does not use or modify the stack.
11. Why do bootloaders use the cli instruction?
12. Clearing the interrupt flag ensures that the first boot code runs uninterrupted.
13. What does 7 do?
14. It is required to create the stack in a bare-metal environment since it assigns the stack pointer to the specified address.
15. What is the purpose of an unending loop 8 in a bootloader.
16. It prevents the program from abruptly terminating by keeping the bootloader active indefinitely.
17. How does assembly integration utilize the 9 keyword?
18. It facilitates calls between assembly and Rust code by defining variables or functions that are already defined elsewhere.

Common Questions Regarding Bare Metal Rust Stack Pointer Configuration

Common Questions Regarding Bare Metal Rust Stack Pointer Configuration