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

10
apps/zig-mandel/src/uvm.zig
View file

@ -4,25 +4,25 @@ const uvm32 = @cImport({
});
const std = @import("std");
pub inline fn syscall(id: u32, param: u32) u32 {
pub inline fn syscall(id: u32, param1: u32, param2: u32) u32 {
var val: u32 = undefined;
asm volatile ("ecall"
: [val] "={a1}" (val),
: [param] "{a0}" (param),
: [param1] "{a0}" (param1), [param2] "{a1}" (param2),
[id] "{a7}" (id),
: .{ .memory = true });
return val;
}
pub inline fn println(val: [:0]const u8) void {
_ = syscall(uvm32.UVM32_SYSCALL_PRINTLN, @intFromPtr(val.ptr));
_ = syscall(uvm32.UVM32_SYSCALL_PRINTLN, @intFromPtr(val.ptr), 0);
}
pub inline fn yield() void {
_ = syscall(uvm32.UVM32_SYSCALL_YIELD, 0);
_ = syscall(uvm32.UVM32_SYSCALL_YIELD, 0, 0);
}
pub inline fn putc(c:u8) void {
_ = syscall(uvm32.UVM32_SYSCALL_PUTC, c);
_ = syscall(uvm32.UVM32_SYSCALL_PUTC, c, 0);
}