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wasm-linker: create TLS symbols

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Initialize TLS symbols when shared-memory is enabled. Those symbols
will be called by synthetic functions created by the linker. (TODO).
This commit is contained in:
Luuk de Gram 2023-03-14 19:51:30 +01:00
parent 00af3a79ae
commit ff28c8b600
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GPG Key ID: A8CFE58E4DC7D664
1 changed files with 42 additions and 2 deletions
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44
src/link/Wasm.zig
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@ -443,6 +443,30 @@ pub fn openPath(allocator: Allocator, sub_path: []const u8, options: link.Option
// at the end during `initializeCallCtorsFunction`.
}
// shared-memory symbols for TLS support
if (wasm_bin.base.options.shared_memory) {
{
const loc = try wasm_bin.createSyntheticSymbol("__tls_base", .global);
const symbol = loc.getSymbol(wasm_bin);
symbol.setFlag(.WASM_SYM_VISIBILITY_HIDDEN);
}
{
const loc = try wasm_bin.createSyntheticSymbol("__tls_size", .global);
const symbol = loc.getSymbol(wasm_bin);
symbol.setFlag(.WASM_SYM_VISIBILITY_HIDDEN);
}
{
const loc = try wasm_bin.createSyntheticSymbol("__tls_align", .global);
const symbol = loc.getSymbol(wasm_bin);
symbol.setFlag(.WASM_SYM_VISIBILITY_HIDDEN);
}
{
const loc = try wasm_bin.createSyntheticSymbol("__wasm_tls_init", .function);
const symbol = loc.getSymbol(wasm_bin);
symbol.setFlag(.WASM_SYM_VISIBILITY_HIDDEN);
}
}
// if (!options.strip and options.module != null) {
// wasm_bin.dwarf = Dwarf.init(allocator, &wasm_bin.base, options.target);
// try wasm_bin.initDebugSections();
@ -2286,12 +2310,28 @@ fn setupMemory(wasm: *Wasm) !void {
// set TLS-related symbols
if (mem.eql(u8, entry.key_ptr.*, ".tdata")) {
if (wasm.findGlobalSymbol("__tls_base")) |loc| {
if (wasm.findGlobalSymbol("__tls_size")) |loc| {
const sym = loc.getSymbol(wasm);
sym.index = @intCast(u32, wasm.wasm_globals.items.len) + wasm.imported_globals_count;
try wasm.wasm_globals.append(wasm.base.allocator, .{
.global_type = .{ .valtype = .i32, .mutable = false },
.init = .{ .i32_const = @intCast(i32, memory_ptr) },
.init = .{ .i32_const = @intCast(i32, segment.size) },
});
}
if (wasm.findGlobalSymbol("__tls_align")) |loc| {
const sym = loc.getSymbol(wasm);
sym.index = @intCast(u32, wasm.wasm_globals.items.len) + wasm.imported_globals_count;
try wasm.wasm_globals.append(wasm.base.allocator, .{
.global_type = .{ .valtype = .i32, .mutable = false },
.init = .{ .i32_const = @intCast(i32, segment.alignment) },
});
}
if (wasm.findGlobalSymbol("__tls_base")) |loc| {
const sym = loc.getSymbol(wasm);
sym.index = @intCast(u32, wasm.wasm_globals.items.len) + wasm.imported_globals_count;
try wasm.wasm_globals.append(wasm.base.allocator, .{
.global_type = .{ .valtype = .i32, .mutable = wasm.base.options.shared_memory },
.init = .{ .i32_const = if (wasm.base.options.shared_memory) @as(u32, 0) else @intCast(i32, memory_ptr) },
});
}
}