fff3c1fff4
Previously, the compiler had special logic to determine whether to include the startup code, which was in `std/special/start.zig`. Now, the file is moved to `std/start.zig`, and there is no special logic in the compiler. Instead, the standard library unconditionally imports the `start.zig` file, which then has a `comptime` block that does the logic of determining what, if any, start symbols to export. Instead of `start.zig` being in its own special package, it is just another normal file that is part of the standard library. `std.builtin.TestFn` is now part of the standard library rather than specially generated by the compiler.
49 lines
1.8 KiB
Zig
49 lines
1.8 KiB
Zig
const std = @import("std");
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const builtin = std.builtin;
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export var _tls_index: u32 = std.os.windows.TLS_OUT_OF_INDEXES;
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export var _tls_start: u8 linksection(".tls") = 0;
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export var _tls_end: u8 linksection(".tls$ZZZ") = 0;
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export var __xl_a: std.os.windows.PIMAGE_TLS_CALLBACK linksection(".CRT$XLA") = null;
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export var __xl_z: std.os.windows.PIMAGE_TLS_CALLBACK linksection(".CRT$XLZ") = null;
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comptime {
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if (builtin.arch == .i386) {
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// The __tls_array is the offset of the ThreadLocalStoragePointer field
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// in the TEB block whose base address held in the %fs segment.
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asm (
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\\ .global __tls_array
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\\ __tls_array = 0x2C
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);
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}
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}
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// TODO this is how I would like it to be expressed
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// TODO also note, ReactOS has a +1 on StartAddressOfRawData and AddressOfCallBacks. Investigate
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// why they do that.
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//export const _tls_used linksection(".rdata$T") = std.os.windows.IMAGE_TLS_DIRECTORY {
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// .StartAddressOfRawData = @ptrToInt(&_tls_start),
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// .EndAddressOfRawData = @ptrToInt(&_tls_end),
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// .AddressOfIndex = @ptrToInt(&_tls_index),
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// .AddressOfCallBacks = @ptrToInt(__xl_a),
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// .SizeOfZeroFill = 0,
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// .Characteristics = 0,
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//};
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// This is the workaround because we can't do @ptrToInt at comptime like that.
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pub const IMAGE_TLS_DIRECTORY = extern struct {
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StartAddressOfRawData: *c_void,
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EndAddressOfRawData: *c_void,
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AddressOfIndex: *c_void,
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AddressOfCallBacks: *c_void,
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SizeOfZeroFill: u32,
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Characteristics: u32,
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};
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export const _tls_used linksection(".rdata$T") = IMAGE_TLS_DIRECTORY{
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.StartAddressOfRawData = &_tls_start,
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.EndAddressOfRawData = &_tls_end,
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.AddressOfIndex = &_tls_index,
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.AddressOfCallBacks = &__xl_a,
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.SizeOfZeroFill = 0,
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.Characteristics = 0,
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};
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