gistfile1.txt

#![no_std]
#![feature(asm)]
#![no_main]

use cortex_m_rt::entry;
use panic_halt as _;

extern crate stm32f1xx_hal;

#[entry]
unsafe fn boot() -> ! {
        let sp: * const u32 = 0x08008000 as *const _;
        let sp_val:u32 = *sp;

        let reset: *const u32 = 0x08008004 as *const _;
        let reset_val:u32 = (*reset) as u32;

        do_jump( sp_val, reset_val );

        loop {}
}

pub unsafe extern "C" fn do_jump(_sp: u32, _t: u32) -> () {
        asm! {
                "msr msp, r0",
        };
        asm! {
                "blx r1"
        };
}