diff options
| -rw-r--r-- | src/os.zig | 105 | ||||
| -rw-r--r-- | src/root.zig | 102 |
2 files changed, 106 insertions, 101 deletions
diff --git a/src/os.zig b/src/os.zig new file mode 100644 index 0000000..42ef2d0 --- /dev/null +++ b/src/os.zig @@ -0,0 +1,105 @@ +// SPDX-FileCopyrightText: 2024 Himbeer <himbeer@disroot.org> +// +// SPDX-License-Identifier: AGPL-3.0-or-later + +const std = @import("std"); +pub const hwinfo = @import("hwinfo.zig"); + +pub const max_args = 6; + +const Result = struct { + value: usize, + error_code: usize, +}; + +const SyscallError = error{Kernel}; + +fn autoCast(value: anytype) usize { + return switch (@typeInfo(@TypeOf(value))) { + .Type => @compileError("cannot pass type to system call"), + .Void => @compileError("cannot pass void to system call"), + .NoReturn => @compileError("cannot pass noreturn to system call"), + .Pointer => @intFromPtr(value), + else => value, + }; +} + +fn ecall(number: usize, args: anytype) Result { + var registers = [_]usize{0} ** max_args; + inline for (args, 0..) |arg, i| { + if (i >= max_args) @compileError("too many arguments to system call"); + registers[i] = autoCast(arg); + } + + var result: Result = undefined; + asm volatile ( + \\ ecall + \\ sd a0, 0(%[value]) + \\ sd a1, 0(%[error_code]) + : + : [value] "r" (&result.value), + [error_code] "r" (&result.error_code), + [a0] "{a0}" (registers[0]), + [a1] "{a1}" (registers[1]), + [a2] "{a2}" (registers[2]), + [a3] "{a3}" (registers[3]), + [a4] "{a4}" (registers[4]), + [a5] "{a5}" (registers[5]), + [number] "{a7}" (number), + ); + return result; +} + +pub fn errorName(code: u16, buffer: []u8) !usize { + const result = ecall(100000, .{ + code, + buffer.ptr, + buffer.len, + }); + if (result.error_code != 0) return SyscallError.Kernel; + return result.value; +} + +pub fn consoleWrite(bytes: []const u8) !usize { + const result = ecall(100001, .{ bytes.ptr, bytes.len }); + if (result.error_code != 0) return SyscallError.Kernel; + return result.value; +} + +pub fn launch(bytes: []align(@alignOf(std.elf.Elf64_Ehdr)) const u8) !usize { + const result = ecall(100002, .{ bytes.ptr, bytes.len }); + if (result.error_code != 0) return SyscallError.Kernel; + return result.value; +} + +pub fn end() noreturn { + _ = ecall(100003, .{}); + unreachable; +} + +pub fn terminate(pid: u16, thread: usize) !void { + const result = ecall(100004, .{ pid, thread }); + if (result.error_code != 0) return SyscallError.Kernel; +} + +pub fn processId() u16 { + const result = ecall(100005, .{}); + return result.value; +} + +pub fn threadId() usize { + const result = ecall(100006, .{}); + return result.value; +} + +pub fn rawUserinit() []const u8 { + var ptr: [*]const u8 = undefined; + const result = ecall(100007, .{&ptr}); + return ptr[0..result.value]; +} + +pub fn devicesByKind(kind: hwinfo.DevKind, devices: []hwinfo.Dev) !usize { + const result = ecall(100008, .{ kind, devices.ptr, devices.len }); + if (result.error_code != 0) return SyscallError.Kernel; + return result.value; +} diff --git a/src/root.zig b/src/root.zig index 6f6c9cb..d6362e6 100644 --- a/src/root.zig +++ b/src/root.zig @@ -4,17 +4,7 @@ const builtin = @import("builtin"); const root = @import("root"); -const std = @import("std"); -pub const hwinfo = @import("hwinfo.zig"); - -pub const max_args = 6; - -const Result = struct { - value: usize, - error_code: usize, -}; - -const SyscallError = error{Kernel}; +pub const os = @import("os.zig"); fn _start() callconv(.C) noreturn { if (!@hasDecl(root, "main")) @compileError("no main function"); @@ -25,93 +15,3 @@ fn _start() callconv(.C) noreturn { comptime { if (!builtin.is_test) @export(_start, .{ .name = "_start" }); } - -fn autoCast(value: anytype) usize { - return switch (@typeInfo(@TypeOf(value))) { - .Type => @compileError("cannot pass type to system call"), - .Void => @compileError("cannot pass void to system call"), - .NoReturn => @compileError("cannot pass noreturn to system call"), - .Pointer => @intFromPtr(value), - else => value, - }; -} - -fn ecall(number: usize, args: anytype) Result { - var registers = [_]usize{0} ** max_args; - inline for (args, 0..) |arg, i| { - if (i >= max_args) @compileError("too many arguments to system call"); - registers[i] = autoCast(arg); - } - - var result: Result = undefined; - asm volatile ( - \\ ecall - \\ sd a0, 0(%[value]) - \\ sd a1, 0(%[error_code]) - : - : [value] "r" (&result.value), - [error_code] "r" (&result.error_code), - [a0] "{a0}" (registers[0]), - [a1] "{a1}" (registers[1]), - [a2] "{a2}" (registers[2]), - [a3] "{a3}" (registers[3]), - [a4] "{a4}" (registers[4]), - [a5] "{a5}" (registers[5]), - [number] "{a7}" (number), - ); - return result; -} - -pub fn errorName(code: u16, buffer: []u8) !usize { - const result = ecall(100000, .{ - code, - buffer.ptr, - buffer.len, - }); - if (result.error_code != 0) return SyscallError.Kernel; - return result.value; -} - -pub fn consoleWrite(bytes: []const u8) !usize { - const result = ecall(100001, .{ bytes.ptr, bytes.len }); - if (result.error_code != 0) return SyscallError.Kernel; - return result.value; -} - -pub fn launch(bytes: []align(@alignOf(std.elf.Elf64_Ehdr)) const u8) !usize { - const result = ecall(100002, .{ bytes.ptr, bytes.len }); - if (result.error_code != 0) return SyscallError.Kernel; - return result.value; -} - -pub fn end() noreturn { - _ = ecall(100003, .{}); - unreachable; -} - -pub fn terminate(pid: u16, thread: usize) !void { - const result = ecall(100004, .{ pid, thread }); - if (result.error_code != 0) return SyscallError.Kernel; -} - -pub fn processId() u16 { - const result = ecall(100005, .{}); - return result.value; -} - -pub fn threadId() usize { - const result = ecall(100006, .{}); - return result.value; -} - -pub fn rawUserinit() []const u8 { - var ptr: [*]const u8 = undefined; - const result = ecall(100007, .{&ptr}); - return ptr[0..result.value]; -} - -pub fn devicesByKind(kind: hwinfo.DevKind, devices: []hwinfo.Dev) !usize { - const result = ecall(100008, .{ kind, devices.ptr, devices.len }); - if (result.error_code != 0) return SyscallError.Kernel; - return result.value; -} |