mirror/uvm32
1
Fork 0
mirror of https://github.com/ringtailsoftware/uvm32.git synced 2026-06-05 22:43:39 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Rework syscall ABI.

Browse source 
Syscalls now accept two parameters, allowing for things like "int count = read(buf, len)"
Rather than providing safe signatures for syscalls, the user is now given helper functions to safely parse incoming values, c-strings and slices.
This commit is contained in:
Toby Jaffey 2025-12-09 21:51:35 +00:00
parent f046a590c0
commit 76fba39a21
28 changed files with 543 additions and 537 deletions
Download patch file Download diff file Expand all files Collapse all files

11
apps/rust-hello/src/main.rs
View file

@ -11,13 +11,13 @@ include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
// startup code
global_asm!(include_str!("../../crt0.S"), UVM32_SYSCALL_HALT = const UVM32_SYSCALL_HALT);
fn syscall(id: u32, n: u32) -> u32 {
fn syscall(id: u32, param1: u32, param2: u32) -> u32 {
let mut value;
unsafe {
asm!("ecall",
in("a0") n,
in("a0") param1, in("a1") param2,
in("a7") id,
lateout("a1") value,
lateout("a2") value,
);
}
return value;
@ -25,17 +25,18 @@ fn syscall(id: u32, n: u32) -> u32 {
fn println(message: &str) {
let addr_value = message.as_ptr() as u32;
syscall(UVM32_SYSCALL_PRINTLN, addr_value);
syscall(UVM32_SYSCALL_PRINTLN, addr_value, 0);
}
fn printdec(n: u32) {
syscall(UVM32_SYSCALL_PRINTDEC, n);
syscall(UVM32_SYSCALL_PRINTDEC, n, 0);
}
#[no_mangle]
pub extern "C" fn main() {
for i in 0..10 {
printdec(i);
println("\0");
}
println("Hello, world!\0");
}