1pub const encoding = @import("../codegen.zig").aarch64.encoding;
 2
 3pub fn writeAddImmInst(value: u12, code: *[4]u8) void {
 4    var inst: encoding.Instruction = .read(code);
 5    inst.data_processing_immediate.add_subtract_immediate.group.imm12 = value;
 6    inst.write(code);
 7}
 8
 9pub fn writeLoadStoreRegInst(value: u12, code: *[4]u8) void {
10    var inst: encoding.Instruction = .read(code);
11    inst.load_store.register_unsigned_immediate.group.imm12 = value;
12    inst.write(code);
13}
14
15pub fn calcNumberOfPages(saddr: i64, taddr: i64) error{Overflow}!i33 {
16    return math.cast(i21, (taddr >> 12) - (saddr >> 12)) orelse error.Overflow;
17}
18
19pub fn writeAdrInst(imm: i33, code: *[4]u8) void {
20    var inst: encoding.Instruction = .read(code);
21    inst.data_processing_immediate.pc_relative_addressing.group.immhi = @intCast(imm >> 2);
22    inst.data_processing_immediate.pc_relative_addressing.group.immlo = @bitCast(@as(i2, @truncate(imm)));
23    inst.write(code);
24}
25
26pub fn writeBranchImm(disp: i28, code: *[4]u8) void {
27    var inst: encoding.Instruction = .read(code);
28    inst.branch_exception_generating_system.unconditional_branch_immediate.group.imm26 = @intCast(@shrExact(disp, 2));
29    inst.write(code);
30}
31
32const assert = std.debug.assert;
33const builtin = @import("builtin");
34const math = std.math;
35const mem = std.mem;
36const std = @import("std");