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Rework host/target interface to use ecall and proper syscalls instead of CSRs

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This commit is contained in:
Toby Jaffey 2025-12-08 02:44:38 +00:00
parent a305fce466
commit 751f068486
26 changed files with 360 additions and 364 deletions
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29
apps/rust-hello/src/main.rs
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@ -9,26 +9,27 @@ use core::panic::PanicInfo;
include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
// startup code
global_asm!(include_str!("../../crt0.s"));
global_asm!(include_str!("../../crt0.S"));
fn println(message: &str) {
fn syscall(id: u32, n: u32) -> u32 {
let mut value;
unsafe {
asm!(
"csrw {i}, {x}",
i = const IOREQ_PRINTLN,
x = in(reg) message.as_ptr(),
asm!("ecall",
in("a0") n,
in("a7") id,
lateout("a1") value,
);
}
return value;
}
fn println(message: &str) {
let addr_value = message.as_ptr() as u32;
syscall(IOREQ_PRINTLN, addr_value);
}
fn printd(n: u32) {
unsafe {
asm!(
"csrw {i}, {x}",
i = const IOREQ_PRINTD,
x = in(reg) n,
);
}
syscall(IOREQ_PRINTD, n);
}
#[no_mangle]
@ -36,7 +37,7 @@ pub extern "C" fn main() {
for i in 0..10 {
printd(i);
}
println("Hello, world!");
println("Hello, world!\0");
}
#[panic_handler]