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537a873b17
https://llvm.org/docs/HowToBuildWindowsItaniumPrograms.html This is a weird middle ground between `*-windows-gnu` and `*-windows-msvc`. It uses the C++ ABI of the former while using the system libraries of the latter.
50 lines
2.1 KiB
Zig
50 lines
2.1 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const windows = std.os.windows;
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export var _tls_index: u32 = std.os.windows.TLS_OUT_OF_INDEXES;
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export var _tls_start: ?*anyopaque linksection(".tls") = null;
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export var _tls_end: ?*anyopaque linksection(".tls$ZZZ") = null;
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export var __xl_a: windows.PIMAGE_TLS_CALLBACK linksection(".CRT$XLA") = null;
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export var __xl_z: windows.PIMAGE_TLS_CALLBACK linksection(".CRT$XLZ") = null;
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comptime {
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if (builtin.cpu.arch == .x86 and !builtin.abi.isGnu() and builtin.zig_backend != .stage2_c) {
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// The __tls_array is the offset of the ThreadLocalStoragePointer field
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// in the TEB block whose base address held in the %fs segment.
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asm (
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\\ .global __tls_array
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\\ __tls_array = 0x2C
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);
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}
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}
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// TODO this is how I would like it to be expressed
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//export const _tls_used linksection(".rdata$T") = std.os.windows.IMAGE_TLS_DIRECTORY {
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// .StartAddressOfRawData = @intFromPtr(&_tls_start),
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// .EndAddressOfRawData = @intFromPtr(&_tls_end),
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// .AddressOfIndex = @intFromPtr(&_tls_index),
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// .AddressOfCallBacks = @intFromPtr(__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 @intFromPtr at comptime like that.
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pub const IMAGE_TLS_DIRECTORY = extern struct {
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StartAddressOfRawData: *?*anyopaque,
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EndAddressOfRawData: *?*anyopaque,
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AddressOfIndex: *u32,
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AddressOfCallBacks: [*:null]windows.PIMAGE_TLS_CALLBACK,
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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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// __xl_a is just a global variable containing a null pointer; the actual callbacks sit in
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// between __xl_a and __xl_z. So we need to skip over __xl_a here. If there are no callbacks,
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// this just means we point to __xl_z (the null terminator).
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.AddressOfCallBacks = @as([*:null]windows.PIMAGE_TLS_CALLBACK, @ptrCast(&__xl_a)) + 1,
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.SizeOfZeroFill = 0,
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.Characteristics = 0,
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};
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