1 files changed, 38 insertions, 0 deletions
diff --git a/src/lib/TrapFrame.zig b/src/lib/TrapFrame.zig
new file mode 100644
index 0000000..71556ed
--- /dev/null
+++ b/src/lib/TrapFrame.zig
@@ -0,0 +1,38 @@
+// SPDX-FileCopyrightText: 2024 Himbeer <himbeer@disroot.org>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+general_purpose_registers: [32]usize, // Offset: 0
+floating_point_registers: [32]usize, // Offset: 256
+satp: usize, // Offset: 512
+stack_pointer: *allowzero u8, // Offset: 520
+hart_id: usize, // Offset: 528
+
+const Self = @This();
+
+pub fn setReturnValue(self: *Self, value: anytype) void {
+    switch (@typeInfo(@TypeOf(value))) {
+        .ErrorUnion => self.returnErrorUnion(value),
+        .ErrorSet => self.returnError(value),
+        else => self.returnValue(value),
+    }
+}
+
+fn returnErrorUnion(self: *Self, error_union: anytype) void {
+    if (error_union) |value| {
+        self.returnValue(value);
+    } else |err| {
+        self.returnError(err);
+    }
+}
+
+fn returnError(self: *Self, err: anyerror) void {
+    self.general_purpose_registers[11] = @intFromError(err);
+}
+
+fn returnValue(self: *Self, value: anytype) void {
+    self.general_purpose_registers[11] = 0;
+    if (@typeInfo(@TypeOf(value)) != .Void) {
+        self.general_purpose_registers[10] = @bitCast(value);
+    }
+}