syscall: Fix unaligned arguments to launch() causing a kernel panic

1 files changed, 3 insertions, 2 deletions

diff --git a/src/lib/syscall.zig b/src/lib/syscall.zig
index 5ca10cf..6b94e16 100644
--- a/src/lib/syscall.zig
+++ b/src/lib/syscall.zig
@@ -90,8 +90,9 @@ fn consoleWrite(trap_frame: *const TrapFrame) !usize {
 fn launch(trap_frame: *const TrapFrame) !usize {
     const alignment = @alignOf(std.elf.Elf64_Ehdr);
     const bytes_addr = trap_frame.general_purpose_registers[10];
-    const bytes_opt: ?[*]align(alignment) const u8 = @ptrFromInt(bytes_addr);
-    const bytes_ptr = bytes_opt orelse return Error.ZeroAddressSupplied;
+    const bytes_opt: ?[*]const u8 = @ptrFromInt(bytes_addr);
+    const bytes_noalign = bytes_opt orelse return Error.ZeroAddressSupplied;
+    const bytes_ptr = try std.math.alignCast(alignment, bytes_noalign);
     const len = trap_frame.general_purpose_registers[11];
 
     const bytes = bytes_ptr[0..len];