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📁 ..
📄 ar.go(7.15 KB)
📄 asmb.go(5.44 KB)
📄 config.go(5.64 KB)
📄 data.go(99.49 KB)
📄 data_test.go(2.27 KB)
📄 deadcode.go(18.8 KB)
📄 deadcode_test.go(1.69 KB)
📄 decodesym.go(10.12 KB)
📄 dwarf.go(72.42 KB)
📄 dwarf_test.go(48.49 KB)
📄 elf.go(63.2 KB)
📄 elf_test.go(4.18 KB)
📄 errors.go(1.89 KB)
📄 execarchive.go(876 B)
📄 execarchive_noexec.go(320 B)
📄 fallocate_test.go(1.69 KB)
📄 go.go(11.17 KB)
📄 go_test.go(2.67 KB)
📄 heap.go(1.89 KB)
📄 heap_test.go(1.87 KB)
📄 inittask.go(6.18 KB)
📄 issue33808_test.go(792 B)
📄 ld.go(7.98 KB)
📄 ld_test.go(10.34 KB)
📄 lib.go(86.45 KB)
📄 link.go(5.13 KB)
📄 macho.go(43.68 KB)
📄 macho_combine_dwarf.go(13.1 KB)
📄 main.go(15.99 KB)
📄 msync_darwin_libc.go(307 B)
📄 nooptcgolink_test.go(733 B)
📄 outbuf.go(8.05 KB)
📄 outbuf_darwin.go(1.35 KB)
📄 outbuf_freebsd.go(515 B)
📄 outbuf_linux.go(304 B)
📄 outbuf_mmap.go(1.46 KB)
📄 outbuf_nofallocate.go(301 B)
📄 outbuf_nommap.go(741 B)
📄 outbuf_notdarwin.go(236 B)
📄 outbuf_test.go(2.21 KB)
📄 outbuf_windows.go(2.31 KB)
📄 pcln.go(29.75 KB)
📄 pe.go(48.82 KB)
📄 seh.go(2.05 KB)
📄 stackcheck.go(11.88 KB)
📄 stackcheck_test.go(2.25 KB)
📄 sym.go(3.91 KB)
📄 symtab.go(29.17 KB)
📄 target.go(3.86 KB)
📁 testdata
📄 typelink.go(1.87 KB)
📄 util.go(2.5 KB)
📄 xcoff.go(51.76 KB)

Editing: seh.go

// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package ld

import (
	"cmd/internal/sys"
	"cmd/link/internal/loader"
	"cmd/link/internal/sym"
)

var sehp struct {
	pdata []sym.LoaderSym
	xdata []sym.LoaderSym
}

func writeSEH(ctxt *Link) {
	switch ctxt.Arch.Family {
	case sys.AMD64:
		writeSEHAMD64(ctxt)
	}
}

func writeSEHAMD64(ctxt *Link) {
	ldr := ctxt.loader
	mkSecSym := func(name string, kind sym.SymKind) *loader.SymbolBuilder {
		s := ldr.CreateSymForUpdate(name, 0)
		s.SetType(kind)
		s.SetAlign(4)
		return s
	}
	pdata := mkSecSym(".pdata", sym.SSEHSECT)
	xdata := mkSecSym(".xdata", sym.SSEHSECT)
	// The .xdata entries have very low cardinality
	// as it only contains frame pointer operations,
	// which are very similar across functions.
	// These are referenced by .pdata entries using
	// an RVA, so it is possible, and binary-size wise,
	// to deduplicate .xdata entries.
	uwcache := make(map[string]int64) // aux symbol name --> .xdata offset
	for _, s := range ctxt.Textp {
		if fi := ldr.FuncInfo(s); !fi.Valid() {
			continue
		}
		uw := ldr.SEHUnwindSym(s)
		if uw == 0 {
			continue
		}
		name := ctxt.SymName(uw)
		off, cached := uwcache[name]
		if !cached {
			off = xdata.Size()
			uwcache[name] = off
			xdata.AddBytes(ldr.Data(uw))
			// The SEH unwind data can contain relocations,
			// make sure those are copied over.
			rels := ldr.Relocs(uw)
			for i := 0; i < rels.Count(); i++ {
				r := rels.At(i)
				rel, _ := xdata.AddRel(r.Type())
				rel.SetOff(int32(off) + r.Off())
				rel.SetSiz(r.Siz())
				rel.SetSym(r.Sym())
				rel.SetAdd(r.Add())
			}
		}

// Reference:
		// https://learn.microsoft.com/en-us/cpp/build/exception-handling-x64#struct-runtime_function
		pdata.AddPEImageRelativeAddrPlus(ctxt.Arch, s, 0)
		pdata.AddPEImageRelativeAddrPlus(ctxt.Arch, s, ldr.SymSize(s))
		pdata.AddPEImageRelativeAddrPlus(ctxt.Arch, xdata.Sym(), off)
	}
	sehp.pdata = append(sehp.pdata, pdata.Sym())
	sehp.xdata = append(sehp.xdata, xdata.Sym())
}

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Editing: seh.go

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