}
			base := filepath.Base(path)
			isGo := strings.HasSuffix(filename, ".go") || strings.HasSuffix(filename, ".s")
			isCgo := cgoFiles[filename] || !isGo
			overlayPath, isOverlay := fsys.OverlayPath(path)
			if isCgo && isOverlay {
				hasCgoOverlay = true
			}
			if !isCgo && isOverlay {
				rewrite += overlayPath + "=>" + filepath.Join(rewriteDir, base) + ";"
			} else if isCgo {

	switch sig {
	case _SIGHUP, _SIGINT:
		if atomic.Loaduintptr(&fwdSig[sig]) == _SIG_IGN {
			return false
		}
	}

	if (GOOS == "linux" || GOOS == "android") && !iscgo && sig == sigPerThreadSyscall {
		// sigPerThreadSyscall is the same signal used by glibc for
		// per-thread syscalls on Linux. We use it for the same purpose
		// in non-cgo binaries.
		return true
	}

				p.Doc = synopsis
			}
		}

		// Record Imports and information about cgo.
		isCgo := false
		imports := tf.imports()
		for _, imp := range imports {
			if imp.path == "C" {
				if isTest {
					badGoFile(name, fmt.Errorf("use of cgo in test %s not supported", name))
					continue
				}
				isCgo = true
			}
		}
		if directives := tf.cgoDirectives(); directives != "" {

	var sa usigactiont
	sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
	sa.sa_mask = ^uint32(0)
	if fn == abi.FuncPCABIInternal(sighandler) { // abi.FuncPCABIInternal(sighandler) matches the callers in signal_unix.go
		if iscgo {
			fn = abi.FuncPCABI0(cgoSigtramp)
		} else {
			fn = abi.FuncPCABI0(sigtramp)
		}
	}
	*(*uintptr)(unsafe.Pointer(&sa.__sigaction_u)) = fn
	sigaction(i, &sa, nil)
}

	print("Exception ", hex(info.exceptioncode), " ", hex(info.exceptioninformation[0]), " ", hex(info.exceptioninformation[1]), " ", hex(r.ip()), "\n")

	print("PC=", hex(r.ip()), "\n")
	if g0.m.incgo && gp == g0.m.g0 && g0.m.curg != nil {
		if iscgo {
			print("signal arrived during external code execution\n")
		}
		gp = g0.m.curg
	}
	print("\n")

	g0.m.throwing = throwTypeRuntime
	g0.m.caughtsig.set(gp)

		sa.sa_restorer = abi.FuncPCABI0(sigreturn__sigaction)
	}
	if fn == abi.FuncPCABIInternal(sighandler) { // abi.FuncPCABIInternal(sighandler) matches the callers in signal_unix.go
		if iscgo {
			fn = abi.FuncPCABI0(cgoSigtramp)
		} else {
			fn = abi.FuncPCABI0(sigtramp)
		}
	}
	sa.sa_handler = fn
	sigaction(i, &sa, nil)
}

//go:nosplit
//go:nowritebarrierrec

}

//go:nosplit
func raceinit() (gctx, pctx uintptr) {
	lockInit(&raceFiniLock, lockRankRaceFini)

	// On most machines, cgo is required to initialize libc, which is used by race runtime.
	if !iscgo && GOOS != "darwin" {
		throw("raceinit: race build must use cgo")
	}

	racecall(&__tsan_init, uintptr(unsafe.Pointer(&gctx)), uintptr(unsafe.Pointer(&pctx)), abi.FuncPCABI0(racecallbackthunk), 0)

	//
	// At thread start, in minit, the runtime queries the OS for
	// the actual stack bounds so that the stack size doesn't need
	// to be hard-coded into the runtime.
	oh64.SizeOfStackReserve = 0x00200000
	if !iscgo {
		oh64.SizeOfStackCommit = 0x00001000
	} else {
		// TODO(brainman): Maybe remove optional header writing altogether for cgo.
		// For cgo it is the external linker that is building final executable.

	// At this point we're about to call unlockOSThread.
	// The following code must not change to a different m.
	// This is enforced by checking incgo in the schedule function.
	gp.m.incgo = true
	unlockOSThread()

	if gp.m.isextra {
		gp.m.isExtraInC = true
	}

	if gp.m != checkm {
		throw("m changed unexpectedly in cgocallbackg")
	}

	osPreemptExtEnter(gp.m)

threads and thread-local storage. The runtime package declares a few
variables:

	var (
		iscgo             bool
		_cgo_init         unsafe.Pointer
		_cgo_thread_start unsafe.Pointer
	)

Any package using cgo imports "runtime/cgo", which provides
initializations for these variables. It sets iscgo to true, _cgo_init
to a gcc-compiled function that can be called early during program