case sys.AMD64:
		ldr.SetAttrReachable(pdata, true)
		if xdata != 0 {
			ldr.SetAttrReachable(xdata, true)
		}
		return processSEHAMD64(ldr, pdata)
	default:
		// TODO: support SEH on other architectures.
		return fmt.Errorf("unsupported architecture for SEH: %v", arch.Family)
	}
}

func processSEHAMD64(ldr *loader.Loader, pdata sym.LoaderSym) error {
	// The following loop traverses a list of pdata entries,

		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())

func (b *sehbuf) write32(v uint32) {
	b.ctxt.Arch.ByteOrder.PutUint32(b.data[b.off:], v)
	b.off += 4
}

func (b *sehbuf) writecode(op, value uint8) {
	b.write8(value<<4 | op)
}

// populateSeh generates the SEH unwind information for s.
func populateSeh(ctxt *obj.Link, s *obj.LSym) (sehsym *obj.LSym) {
	if s.NoFrame() {
		return
	}

	// This implementation expects the following function prologue layout:

	}

	// VEH is called before SEH, but arm64 MSVC DLLs use SEH to trap
	// illegal instructions during runtime initialization to determine
	// CPU features, so if we make it to the last handler and we're
	// arm64 and it's an illegal instruction and this is coming from
	// non-Go code, then assume it's this runtime probing happen, and
	// pass that onward to SEH.

        c->Rsp += 8;
#elif defined(_X86_)
        c->Eip = *(DWORD *)c->Esp;
        c->Esp += 4;
#else
        c->Pc = c->Lr;
#endif
#ifdef _ARM64_
        // TODO: remove when windows/arm64 supports SEH stack unwinding.
        return EXCEPTION_CONTINUE_EXECUTION;
#endif
    }
    return EXCEPTION_CONTINUE_SEARCH;
}
LONG WINAPI customContinueHandlder(struct _EXCEPTION_POINTERS *ExceptionInfo)
{

	"MULD",
	"MULF",
	"MULU",
	"MULW",
	"NEGD",
	"NEGF",
	"NEGW",
	"NEGV",
	"NOOP",
	"NOR",
	"OR",
	"REM",
	"REMU",
	"RFE",
	"ROTR",
	"ROTRV",
	"SC",
	"SCV",
	"SEB",
	"SEH",
	"SGT",
	"SGTU",
	"SLL",
	"SQRTD",
	"SQRTF",
	"SRA",
	"SRL",
	"SUB",
	"SUBD",
	"SUBF",
	"SUBU",
	"SUBW",
	"SYNC",
	"SYSCALL",
	"TEQ",
	"TLBP",
	"TLBR",
	"TLBWI",

	if runtime.Compiler != "gc" {
		// The exact function names are not going to be the same.
		t.Skip("skipping for non-gc toolchain")
	}
	if runtime.GOARCH != "amd64" {
		// TODO: support SEH on other architectures.
		t.Skip("skipping on non-amd64")
	}
	// Only frames in the test package are checked.
	want := []string{
		"test._Cfunc_backtrace",
		"test.testCallbackCallersSEH.func1.1",

// a.rc, simply contains a reference to its own bytes:
//
//    resname RCDATA a.rc
//
// Object dumping the resultant rsrc.syso, we can see the split sections and
// the @feat.00 SEH symbol:
//
//     rsrc.syso:      file format coff-x86-64
//
//     architecture: x86_64
//     start address: 0x0000000000000000
//
//     Export Table:
//     Sections:

		if fn == 0 {
			break
		}
		pcs[i] = ctx.GetPC()
		n++
		windows.RtlVirtualUnwind(0, base, ctx.GetPC(), fn, uintptr(unsafe.Pointer(ctx)), nil, &frame, nil)
	}
	return pcs[:n]
}

// SEH unwinding does not report inlined frames.
//
//go:noinline
func sehf3(pan bool) []uintptr {
	return sehf4(pan)
}

//go:noinline
func sehf4(pan bool) []uintptr {
	var pcs []uintptr
	if pan {

		ctxt.Arch.Assemble(ctxt, s, newprog)
		if ctxt.Errors > 0 {
			continue
		}
		linkpcln(ctxt, s)
		ctxt.populateDWARF(plist.Curfn, s)
		if ctxt.Headtype == objabi.Hwindows && ctxt.Arch.SEH != nil {
			s.Func().sehUnwindInfoSym = ctxt.Arch.SEH(ctxt, s)
		}
	}
}

func (ctxt *Link) InitTextSym(s *LSym, flag int, start src.XPos) {
	if s == nil {
		// func _() { }
		return
	}
	if s.Func() != nil {