From 8a9f2a6bbd6bdf164ca987edac34ac72447881a5 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Fri, 15 Feb 2019 01:57:51 +0000
Subject: [PATCH] compiler, runtime: harmonize types referenced by both C and
 Go

    Compiling with LTO revealed a number of cases in the runtime and
    standard library where C and Go disagreed about the type of an object or
    function (or where Go and code generated by the compiler disagreed). In
    all cases the underlying representation was the same (e.g., uintptr vs.
    void*), so this wasn't causing actual problems, but it did result in a
    number of annoying warnings when compiling with LTO.

    Reviewed-on: https://go-review.googlesource.com/c/160700

From-SVN: r268923
---
 gcc/go/gofrontend/MERGE          |  2 +-
 gcc/go/gofrontend/expressions.cc |  6 ++--
 gcc/go/gofrontend/gogo.cc        |  5 ++--
 gcc/go/gofrontend/runtime.cc     | 12 --------
 gcc/go/gofrontend/runtime.def    | 10 +++----
 gcc/go/gofrontend/wb.cc          | 36 +++++++++++++++++++-----
 libgo/go/runtime/mgc.go          |  2 +-
 libgo/go/runtime/netpoll.go      | 22 +++++++++------
 libgo/go/runtime/proc.go         |  2 +-
 libgo/go/runtime/stubs.go        |  3 +-
 libgo/go/syscall/syscall_unix.go | 47 ++++----------------------------
 libgo/go/syscall/wait.c          | 16 +++++------
 libgo/runtime/go-caller.c        |  4 +--
 libgo/runtime/go-callers.c       |  6 ++--
 libgo/runtime/go-libmain.c       |  2 +-
 libgo/runtime/go-main.c          |  2 +-
 libgo/runtime/go-reflect-call.c  |  3 +-
 libgo/runtime/go-varargs.c       | 11 ++++++++
 libgo/runtime/panic.c            |  2 +-
 libgo/runtime/runtime.h          |  6 ++--
 libgo/runtime/stack.c            |  6 ++--
 21 files changed, 100 insertions(+), 105 deletions(-)

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index e8d4f99a57f..4b603d994fd 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-4a6f2bb2c8d3f00966f001a5b03c57cb4a278265
+03e28273a4fcb114f5204d52ed107591404002f4
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/gcc/go/gofrontend/expressions.cc b/gcc/go/gofrontend/expressions.cc
index 40b9f18b9de..d46c7543bd9 100644
--- a/gcc/go/gofrontend/expressions.cc
+++ b/gcc/go/gofrontend/expressions.cc
@@ -1344,7 +1344,7 @@ Func_descriptor_expression::make_func_descriptor_type()
   if (Func_descriptor_expression::descriptor_type != NULL)
     return;
   Type* uintptr_type = Type::lookup_integer_type("uintptr");
-  Type* struct_type = Type::make_builtin_struct_type(1, "code", uintptr_type);
+  Type* struct_type = Type::make_builtin_struct_type(1, "fn", uintptr_type);
   Func_descriptor_expression::descriptor_type =
     Type::make_builtin_named_type("functionDescriptor", struct_type);
 }
@@ -3874,7 +3874,9 @@ Unsafe_type_conversion_expression::do_get_backend(Translate_context* context)
 	      || et->integer_type() != NULL
               || et->is_nil_type());
   else if (et->is_unsafe_pointer_type())
-    go_assert(t->points_to() != NULL);
+    go_assert(t->points_to() != NULL
+	      || (t->integer_type() != NULL
+		  && t->integer_type() == Type::lookup_integer_type("uintptr")->real_type()));
   else if (t->interface_type() != NULL)
     {
       bool empty_iface = t->interface_type()->is_empty();
diff --git a/gcc/go/gofrontend/gogo.cc b/gcc/go/gofrontend/gogo.cc
index 79c3cc9f736..9bd25facbff 100644
--- a/gcc/go/gofrontend/gogo.cc
+++ b/gcc/go/gofrontend/gogo.cc
@@ -4513,13 +4513,13 @@ Build_recover_thunks::can_recover_arg(Location location)
     builtin_return_address =
       Gogo::declare_builtin_rf_address("__builtin_return_address");
 
+  Type* uintptr_type = Type::lookup_integer_type("uintptr");
   static Named_object* can_recover;
   if (can_recover == NULL)
     {
       const Location bloc = Linemap::predeclared_location();
       Typed_identifier_list* param_types = new Typed_identifier_list();
-      Type* voidptr_type = Type::make_pointer_type(Type::make_void_type());
-      param_types->push_back(Typed_identifier("a", voidptr_type, bloc));
+      param_types->push_back(Typed_identifier("a", uintptr_type, bloc));
       Type* boolean_type = Type::lookup_bool_type();
       Typed_identifier_list* results = new Typed_identifier_list();
       results->push_back(Typed_identifier("", boolean_type, bloc));
@@ -4539,6 +4539,7 @@ Build_recover_thunks::can_recover_arg(Location location)
   args->push_back(zexpr);
 
   Expression* call = Expression::make_call(fn, args, false, location);
+  call = Expression::make_unsafe_cast(uintptr_type, call, location);
 
   args = new Expression_list();
   args->push_back(call);
diff --git a/gcc/go/gofrontend/runtime.cc b/gcc/go/gofrontend/runtime.cc
index bb30cc15aad..7ecbf689409 100644
--- a/gcc/go/gofrontend/runtime.cc
+++ b/gcc/go/gofrontend/runtime.cc
@@ -60,8 +60,6 @@ enum Runtime_function_type
   RFT_IFACE,
   // Go type interface{}, C type struct __go_empty_interface.
   RFT_EFACE,
-  // Go type func(unsafe.Pointer), C type void (*) (void *).
-  RFT_FUNC_PTR,
   // Pointer to Go type descriptor.
   RFT_TYPE,
   // [2]string.
@@ -176,15 +174,6 @@ runtime_function_type(Runtime_function_type bft)
 	  t = Type::make_empty_interface_type(bloc);
 	  break;
 
-	case RFT_FUNC_PTR:
-	  {
-	    Typed_identifier_list* param_types = new Typed_identifier_list();
-	    Type* ptrtype = runtime_function_type(RFT_POINTER);
-	    param_types->push_back(Typed_identifier("", ptrtype, bloc));
-	    t = Type::make_function_type(NULL, param_types, NULL, bloc);
-	  }
-	  break;
-
 	case RFT_TYPE:
 	  t = Type::make_type_descriptor_ptr_type();
 	  break;
@@ -265,7 +254,6 @@ convert_to_runtime_function_type(Runtime_function_type bft, Expression* e,
     case RFT_COMPLEX128:
     case RFT_STRING:
     case RFT_POINTER:
-    case RFT_FUNC_PTR:
       {
 	Type* t = runtime_function_type(bft);
 	if (!Type::are_identical(t, e->type(), true, NULL))
diff --git a/gcc/go/gofrontend/runtime.def b/gcc/go/gofrontend/runtime.def
index ded62514832..273c8604091 100644
--- a/gcc/go/gofrontend/runtime.def
+++ b/gcc/go/gofrontend/runtime.def
@@ -168,10 +168,10 @@ DEF_GO_RUNTIME(GORECOVER, "runtime.gorecover", P0(), R1(EFACE))
 DEF_GO_RUNTIME(DEFERREDRECOVER, "runtime.deferredrecover", P0(), R1(EFACE))
 
 // Decide whether this function can call recover.
-DEF_GO_RUNTIME(CANRECOVER, "runtime.canrecover", P1(POINTER), R1(BOOL))
+DEF_GO_RUNTIME(CANRECOVER, "runtime.canrecover", P1(UINTPTR), R1(BOOL))
 
 // Set the return address for defer in a defer thunk.
-DEF_GO_RUNTIME(SETDEFERRETADDR, "runtime.setdeferretaddr", P1(POINTER),
+DEF_GO_RUNTIME(SETDEFERRETADDR, "runtime.setdeferretaddr", P1(UINTPTR),
 	       R1(BOOL))
 
 // Check for a deferred function in an exception handler.
@@ -213,10 +213,10 @@ DEF_GO_RUNTIME(REGISTER_GC_ROOTS, "runtime.registerGCRoots", P1(POINTER), R0())
 DEF_GO_RUNTIME(NEW, "runtime.newobject", P1(TYPE), R1(POINTER))
 
 // Start a new goroutine.
-DEF_GO_RUNTIME(GO, "__go_go", P2(FUNC_PTR, POINTER), R0())
+DEF_GO_RUNTIME(GO, "__go_go", P2(UINTPTR, POINTER), R1(POINTER))
 
 // Defer a function.
-DEF_GO_RUNTIME(DEFERPROC, "runtime.deferproc", P3(BOOLPTR, FUNC_PTR, POINTER),
+DEF_GO_RUNTIME(DEFERPROC, "runtime.deferproc", P3(BOOLPTR, UINTPTR, POINTER),
 	       R0())
 
 
@@ -303,7 +303,7 @@ DEF_GO_RUNTIME(IFACEEFACEEQ, "runtime.ifaceefaceeq", P2(IFACE, EFACE),
 
 // Set *dst = src where dst is a pointer to a pointer and src is a pointer.
 DEF_GO_RUNTIME(GCWRITEBARRIER, "runtime.gcWriteBarrier",
-	       P2(POINTER, POINTER), R0())
+	       P2(POINTER, UINTPTR), R0())
 
 // Set *dst = *src for an arbitrary type.
 DEF_GO_RUNTIME(TYPEDMEMMOVE, "runtime.typedmemmove",
diff --git a/gcc/go/gofrontend/wb.cc b/gcc/go/gofrontend/wb.cc
index 8620e405b2e..04619d3f31f 100644
--- a/gcc/go/gofrontend/wb.cc
+++ b/gcc/go/gofrontend/wb.cc
@@ -664,11 +664,19 @@ Gogo::write_barrier_variable()
     {
       Location bloc = Linemap::predeclared_location();
 
-      // We pretend that writeBarrier is a uint32, so that we do a
-      // 32-bit load.  That is what the gc toolchain does.
-      Type* uint32_type = Type::lookup_integer_type("uint32");
-      Variable* var = new Variable(uint32_type, NULL, true, false, false,
-				   bloc);
+      Type* bool_type = Type::lookup_bool_type();
+      Array_type* pad_type = Type::make_array_type(this->lookup_global("byte")->type_value(),
+						   Expression::make_integer_ul(3, NULL, bloc));
+      Type* uint64_type = Type::lookup_integer_type("uint64");
+      Type* wb_type = Type::make_builtin_struct_type(5,
+						     "enabled", bool_type,
+						     "pad", pad_type,
+						     "needed", bool_type,
+						     "cgo", bool_type,
+						     "alignme", uint64_type);
+
+      Variable* var = new Variable(wb_type, NULL,
+				    true, false, false, bloc);
 
       bool add_to_globals;
       Package* package = this->add_imported_package("runtime", "_", false,
@@ -850,8 +858,12 @@ Gogo::assign_with_write_barrier(Function* function, Block* enclosing,
     case Type::TYPE_FUNCTION:
     case Type::TYPE_MAP:
     case Type::TYPE_CHANNEL:
-      // These types are all represented by a single pointer.
-      call = Runtime::make_call(Runtime::GCWRITEBARRIER, loc, 2, lhs, rhs);
+      {
+	// These types are all represented by a single pointer.
+	Type* uintptr_type = Type::lookup_integer_type("uintptr");
+	rhs = Expression::make_unsafe_cast(uintptr_type, rhs, loc);
+	call = Runtime::make_call(Runtime::GCWRITEBARRIER, loc, 2, lhs, rhs);
+      }
       break;
 
     case Type::TYPE_STRING:
@@ -882,7 +894,17 @@ Gogo::check_write_barrier(Block* enclosing, Statement* without,
 {
   Location loc = without->location();
   Named_object* wb = this->write_barrier_variable();
+  // We pretend that writeBarrier is a uint32, so that we do a
+  // 32-bit load.  That is what the gc toolchain does.
+  Type* void_type = Type::make_void_type();
+  Type* unsafe_pointer_type = Type::make_pointer_type(void_type);
+  Type* uint32_type = Type::lookup_integer_type("uint32");
+  Type* puint32_type = Type::make_pointer_type(uint32_type);
   Expression* ref = Expression::make_var_reference(wb, loc);
+  ref = Expression::make_unary(OPERATOR_AND, ref, loc);
+  ref = Expression::make_cast(unsafe_pointer_type, ref, loc);
+  ref = Expression::make_cast(puint32_type, ref, loc);
+  ref = Expression::make_unary(OPERATOR_MULT, ref, loc);
   Expression* zero = Expression::make_integer_ul(0, ref->type(), loc);
   Expression* cond = Expression::make_binary(OPERATOR_EQEQ, ref, zero, loc);
 
diff --git a/libgo/go/runtime/mgc.go b/libgo/go/runtime/mgc.go
index 0973f1de6f7..b8c91ac29a1 100644
--- a/libgo/go/runtime/mgc.go
+++ b/libgo/go/runtime/mgc.go
@@ -238,7 +238,7 @@ func setGCPercent(in int32) (out int32) {
 var gcphase uint32
 
 // The compiler knows about this variable.
-// If you change it, you must change builtin/runtime.go, too.
+// If you change it, you must change gofrontend/wb.cc, too.
 // If you change the first four bytes, you must also change the write
 // barrier insertion code.
 var writeBarrier struct {
diff --git a/libgo/go/runtime/netpoll.go b/libgo/go/runtime/netpoll.go
index 6d391146a44..35159221dc2 100644
--- a/libgo/go/runtime/netpoll.go
+++ b/libgo/go/runtime/netpoll.go
@@ -112,7 +112,7 @@ func poll_runtime_isPollServerDescriptor(fd uintptr) bool {
 }
 
 //go:linkname poll_runtime_pollOpen internal..z2fpoll.runtime_pollOpen
-func poll_runtime_pollOpen(fd uintptr) (*pollDesc, int) {
+func poll_runtime_pollOpen(fd uintptr) (uintptr, int) {
 	pd := pollcache.alloc()
 	lock(&pd.lock)
 	if pd.wg != 0 && pd.wg != pdReady {
@@ -133,11 +133,12 @@ func poll_runtime_pollOpen(fd uintptr) (*pollDesc, int) {
 
 	var errno int32
 	errno = netpollopen(fd, pd)
-	return pd, int(errno)
+	return uintptr(unsafe.Pointer(pd)), int(errno)
 }
 
 //go:linkname poll_runtime_pollClose internal..z2fpoll.runtime_pollClose
-func poll_runtime_pollClose(pd *pollDesc) {
+func poll_runtime_pollClose(ctx uintptr) {
+	pd := (*pollDesc)(unsafe.Pointer(ctx))
 	if !pd.closing {
 		throw("runtime: close polldesc w/o unblock")
 	}
@@ -159,7 +160,8 @@ func (c *pollCache) free(pd *pollDesc) {
 }
 
 //go:linkname poll_runtime_pollReset internal..z2fpoll.runtime_pollReset
-func poll_runtime_pollReset(pd *pollDesc, mode int) int {
+func poll_runtime_pollReset(ctx uintptr, mode int) int {
+	pd := (*pollDesc)(unsafe.Pointer(ctx))
 	err := netpollcheckerr(pd, int32(mode))
 	if err != 0 {
 		return err
@@ -173,7 +175,8 @@ func poll_runtime_pollReset(pd *pollDesc, mode int) int {
 }
 
 //go:linkname poll_runtime_pollWait internal..z2fpoll.runtime_pollWait
-func poll_runtime_pollWait(pd *pollDesc, mode int) int {
+func poll_runtime_pollWait(ctx uintptr, mode int) int {
+	pd := (*pollDesc)(unsafe.Pointer(ctx))
 	err := netpollcheckerr(pd, int32(mode))
 	if err != 0 {
 		return err
@@ -195,7 +198,8 @@ func poll_runtime_pollWait(pd *pollDesc, mode int) int {
 }
 
 //go:linkname poll_runtime_pollWaitCanceled internal..z2fpoll.runtime_pollWaitCanceled
-func poll_runtime_pollWaitCanceled(pd *pollDesc, mode int) {
+func poll_runtime_pollWaitCanceled(ctx uintptr, mode int) {
+	pd := (*pollDesc)(unsafe.Pointer(ctx))
 	// This function is used only on windows after a failed attempt to cancel
 	// a pending async IO operation. Wait for ioready, ignore closing or timeouts.
 	for !netpollblock(pd, int32(mode), true) {
@@ -203,7 +207,8 @@ func poll_runtime_pollWaitCanceled(pd *pollDesc, mode int) {
 }
 
 //go:linkname poll_runtime_pollSetDeadline internal..z2fpoll.runtime_pollSetDeadline
-func poll_runtime_pollSetDeadline(pd *pollDesc, d int64, mode int) {
+func poll_runtime_pollSetDeadline(ctx uintptr, d int64, mode int) {
+	pd := (*pollDesc)(unsafe.Pointer(ctx))
 	lock(&pd.lock)
 	if pd.closing {
 		unlock(&pd.lock)
@@ -288,7 +293,8 @@ func poll_runtime_pollSetDeadline(pd *pollDesc, d int64, mode int) {
 }
 
 //go:linkname poll_runtime_pollUnblock internal..z2fpoll.runtime_pollUnblock
-func poll_runtime_pollUnblock(pd *pollDesc) {
+func poll_runtime_pollUnblock(ctx uintptr) {
+	pd := (*pollDesc)(unsafe.Pointer(ctx))
 	lock(&pd.lock)
 	if pd.closing {
 		throw("runtime: unblock on closing polldesc")
diff --git a/libgo/go/runtime/proc.go b/libgo/go/runtime/proc.go
index b4fa88fe5d8..e9375635b3e 100644
--- a/libgo/go/runtime/proc.go
+++ b/libgo/go/runtime/proc.go
@@ -153,7 +153,7 @@ var runtimeInitTime int64
 var initSigmask sigset
 
 // The main goroutine.
-func main() {
+func main(unsafe.Pointer) {
 	g := getg()
 
 	// Max stack size is 1 GB on 64-bit, 250 MB on 32-bit.
diff --git a/libgo/go/runtime/stubs.go b/libgo/go/runtime/stubs.go
index f2b0ee8abaa..9f5191bc661 100644
--- a/libgo/go/runtime/stubs.go
+++ b/libgo/go/runtime/stubs.go
@@ -283,8 +283,7 @@ func eqstring(x, y string) bool {
 // For gccgo this is in the C code.
 func osyield()
 
-// For gccgo this can be called directly.
-//extern syscall
+//extern __go_syscall6
 func syscall(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) uintptr
 
 // For gccgo, to communicate from the C code to the Go code.
diff --git a/libgo/go/syscall/syscall_unix.go b/libgo/go/syscall/syscall_unix.go
index 450173a1451..b786dc5228b 100644
--- a/libgo/go/syscall/syscall_unix.go
+++ b/libgo/go/syscall/syscall_unix.go
@@ -19,11 +19,8 @@ var (
 	Stderr = 2
 )
 
-//extern syscall
-func c_syscall32(trap int32, a1, a2, a3, a4, a5, a6 int32) int32
-
-//extern syscall
-func c_syscall64(trap int64, a1, a2, a3, a4, a5, a6 int64) int64
+//extern __go_syscall6
+func syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) uintptr
 
 const (
 	darwin64Bit    = runtime.GOOS == "darwin" && sizeofPtr == 8
@@ -38,14 +35,7 @@ const (
 func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
 	Entersyscall()
 	SetErrno(0)
-	var r uintptr
-	if unsafe.Sizeof(r) == 4 {
-		r1 := c_syscall32(int32(trap), int32(a1), int32(a2), int32(a3), 0, 0, 0)
-		r = uintptr(r1)
-	} else {
-		r1 := c_syscall64(int64(trap), int64(a1), int64(a2), int64(a3), 0, 0, 0)
-		r = uintptr(r1)
-	}
+	r := syscall6(trap, a1, a2, a3, 0, 0, 0)
 	err = GetErrno()
 	Exitsyscall()
 	return r, 0, err
@@ -54,47 +44,22 @@ func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
 func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) {
 	Entersyscall()
 	SetErrno(0)
-	var r uintptr
-	if unsafe.Sizeof(r) == 4 {
-		r1 := c_syscall32(int32(trap), int32(a1), int32(a2), int32(a3),
-			int32(a4), int32(a5), int32(a6))
-		r = uintptr(r1)
-	} else {
-		r1 := c_syscall64(int64(trap), int64(a1), int64(a2), int64(a3),
-			int64(a4), int64(a5), int64(a6))
-		r = uintptr(r1)
-	}
+	r := syscall6(trap, a1, a2, a3, a4, a5, a6)
 	err = GetErrno()
 	Exitsyscall()
 	return r, 0, err
 }
 
 func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
-	var r uintptr
 	SetErrno(0)
-	if unsafe.Sizeof(r) == 4 {
-		r1 := c_syscall32(int32(trap), int32(a1), int32(a2), int32(a3), 0, 0, 0)
-		r = uintptr(r1)
-	} else {
-		r1 := c_syscall64(int64(trap), int64(a1), int64(a2), int64(a3), 0, 0, 0)
-		r = uintptr(r1)
-	}
+	r := syscall6(trap, a1, a2, a3, 0, 0, 0)
 	err = GetErrno()
 	return r, 0, err
 }
 
 func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) {
-	var r uintptr
 	SetErrno(0)
-	if unsafe.Sizeof(r) == 4 {
-		r1 := c_syscall32(int32(trap), int32(a1), int32(a2), int32(a3),
-			int32(a4), int32(a5), int32(a6))
-		r = uintptr(r1)
-	} else {
-		r1 := c_syscall64(int64(trap), int64(a1), int64(a2), int64(a3),
-			int64(a4), int64(a5), int64(a6))
-		r = uintptr(r1)
-	}
+	r := syscall6(trap, a1, a2, a3, a4, a5, a6)
 	err = GetErrno()
 	return r, 0, err
 }
diff --git a/libgo/go/syscall/wait.c b/libgo/go/syscall/wait.c
index 9555a41b986..0b234d0c35b 100644
--- a/libgo/go/syscall/wait.c
+++ b/libgo/go/syscall/wait.c
@@ -65,10 +65,10 @@ CoreDump (uint32_t *w)
   return WCOREDUMP (*w) != 0;
 }
 
-extern int ExitStatus (uint32_t *w)
+extern intgo ExitStatus (uint32_t *w)
   __asm__ (GOSYM_PREFIX "syscall.WaitStatus.ExitStatus");
 
-int
+intgo
 ExitStatus (uint32_t *w)
 {
   if (!WIFEXITED (*w))
@@ -76,10 +76,10 @@ ExitStatus (uint32_t *w)
   return WEXITSTATUS (*w);
 }
 
-extern int Signal (uint32_t *w)
+extern intgo Signal (uint32_t *w)
   __asm__ (GOSYM_PREFIX "syscall.WaitStatus.Signal");
 
-int
+intgo
 Signal (uint32_t *w)
 {
   if (!WIFSIGNALED (*w))
@@ -87,10 +87,10 @@ Signal (uint32_t *w)
   return WTERMSIG (*w);
 }
 
-extern int StopSignal (uint32_t *w)
+extern intgo StopSignal (uint32_t *w)
   __asm__ (GOSYM_PREFIX "syscall.WaitStatus.StopSignal");
 
-int
+intgo
 StopSignal (uint32_t *w)
 {
   if (!WIFSTOPPED (*w))
@@ -98,10 +98,10 @@ StopSignal (uint32_t *w)
   return WSTOPSIG (*w);
 }
 
-extern int TrapCause (uint32_t *w)
+extern intgo TrapCause (uint32_t *w)
   __asm__ (GOSYM_PREFIX "syscall.WaitStatus.TrapCause");
 
-int
+intgo
 TrapCause (uint32_t *w __attribute__ ((unused)))
 {
 #ifndef __linux__
diff --git a/libgo/runtime/go-caller.c b/libgo/runtime/go-caller.c
index 6fe43402459..214344694e8 100644
--- a/libgo/runtime/go-caller.c
+++ b/libgo/runtime/go-caller.c
@@ -192,12 +192,12 @@ struct caller_ret
   _Bool ok;
 };
 
-struct caller_ret Caller (int n) __asm__ (GOSYM_PREFIX "runtime.Caller");
+struct caller_ret Caller (intgo n) __asm__ (GOSYM_PREFIX "runtime.Caller");
 
 /* Implement runtime.Caller.  */
 
 struct caller_ret
-Caller (int skip)
+Caller (intgo skip)
 {
   struct caller_ret ret;
   Location loc;
diff --git a/libgo/runtime/go-callers.c b/libgo/runtime/go-callers.c
index 7ea70851c68..a72b4e85454 100644
--- a/libgo/runtime/go-callers.c
+++ b/libgo/runtime/go-callers.c
@@ -236,11 +236,11 @@ runtime_callers (int32 skip, Location *locbuf, int32 m, bool keep_thunks)
   return data.index;
 }
 
-int Callers (int, struct __go_open_array)
+intgo Callers (intgo, struct __go_open_array)
   __asm__ (GOSYM_PREFIX "runtime.Callers");
 
-int
-Callers (int skip, struct __go_open_array pc)
+intgo
+Callers (intgo skip, struct __go_open_array pc)
 {
   Location *locbuf;
   int ret;
diff --git a/libgo/runtime/go-libmain.c b/libgo/runtime/go-libmain.c
index 4f4763947e4..00a8e6b1bda 100644
--- a/libgo/runtime/go-libmain.c
+++ b/libgo/runtime/go-libmain.c
@@ -231,7 +231,7 @@ gostart (void *arg)
   setpagesize (getpagesize ());
   runtime_sched = runtime_getsched();
   runtime_schedinit ();
-  __go_go (runtime_main, NULL);
+  __go_go ((uintptr)(runtime_main), NULL);
   runtime_mstart (runtime_m ());
   abort ();
 }
diff --git a/libgo/runtime/go-main.c b/libgo/runtime/go-main.c
index 1048161786c..301ac4ed803 100644
--- a/libgo/runtime/go-main.c
+++ b/libgo/runtime/go-main.c
@@ -55,7 +55,7 @@ main (int argc, char **argv)
   setpagesize (getpagesize ());
   runtime_sched = runtime_getsched();
   runtime_schedinit ();
-  __go_go (runtime_main, NULL);
+  __go_go ((uintptr)(runtime_main), NULL);
   runtime_mstart (runtime_m ());
   abort ();
 }
diff --git a/libgo/runtime/go-reflect-call.c b/libgo/runtime/go-reflect-call.c
index 6a9a7f35a1a..abd598b46c4 100644
--- a/libgo/runtime/go-reflect-call.c
+++ b/libgo/runtime/go-reflect-call.c
@@ -229,7 +229,8 @@ reflect_call (const struct __go_func_type *func_type, FuncVal *func_val,
 
   call_result = (unsigned char *) malloc (go_results_size (func_type));
 
-  ffi_call_go (&cif, func_val->fn, call_result, params, func_val);
+  ffi_call_go (&cif, (void (*)(void)) func_val->fn, call_result, params,
+	       func_val);
 
   /* Some day we may need to free result values if RESULTS is
      NULL.  */
diff --git a/libgo/runtime/go-varargs.c b/libgo/runtime/go-varargs.c
index 691ee56582d..dda99590dc7 100644
--- a/libgo/runtime/go-varargs.c
+++ b/libgo/runtime/go-varargs.c
@@ -89,3 +89,14 @@ __go_openat (int fd, char *path, int flags, mode_t mode)
 }
 
 #endif
+
+// __go_syscall6 is called by both the runtime and syscall packages.
+// We use uintptr_t to make sure that the types match, since the Go
+// and C "int" types are not the same.
+
+uintptr_t
+__go_syscall6(uintptr_t flag, uintptr_t a1, uintptr_t a2, uintptr_t a3,
+	      uintptr_t a4, uintptr_t a5, uintptr_t a6)
+{
+  return syscall (flag, a1, a2, a3, a4, a5, a6);
+}
diff --git a/libgo/runtime/panic.c b/libgo/runtime/panic.c
index 9cd69ee983a..90255059fcc 100644
--- a/libgo/runtime/panic.c
+++ b/libgo/runtime/panic.c
@@ -34,7 +34,7 @@ runtime_panicstring(const char *s)
 			runtime_throw("panic holding locks");
 		}
 	}
-	runtime_newErrorCString(s, &err);
+	runtime_newErrorCString((uintptr) s, &err);
 	runtime_panic(err);
 }
 
diff --git a/libgo/runtime/runtime.h b/libgo/runtime/runtime.h
index 5da34fbc4a3..a6135b04820 100644
--- a/libgo/runtime/runtime.h
+++ b/libgo/runtime/runtime.h
@@ -94,7 +94,7 @@ struct String
 
 struct FuncVal
 {
-	void	(*fn)(void);
+	uintptr_t fn;
 	// variable-size, fn-specific data here
 };
 
@@ -295,7 +295,7 @@ void	runtime_entersyscall()
   __asm__ (GOSYM_PREFIX "runtime.entersyscall");
 void	runtime_entersyscallblock()
   __asm__ (GOSYM_PREFIX "runtime.entersyscallblock");
-G*	__go_go(void (*pfn)(void*), void*);
+G*	__go_go(uintptr, void*);
 int32	runtime_callers(int32, Location*, int32, bool keep_callers);
 int64	runtime_nanotime(void)	// monotonic time
   __asm__(GOSYM_PREFIX "runtime.nanotime");
@@ -389,7 +389,7 @@ void runtime_panic(Eface)
 /*
  * runtime c-called (but written in Go)
  */
-void	runtime_newErrorCString(const char*, Eface*)
+void	runtime_newErrorCString(uintptr, Eface*)
      __asm__ (GOSYM_PREFIX "runtime.NewErrorCString");
 
 /*
diff --git a/libgo/runtime/stack.c b/libgo/runtime/stack.c
index 2d5d1e09c15..be5e52363d2 100644
--- a/libgo/runtime/stack.c
+++ b/libgo/runtime/stack.c
@@ -20,7 +20,7 @@ extern void * __splitstack_find_context (void *context[10], size_t *, void **,
 // tail call to doscanstack1.
 #pragma GCC optimize ("-fno-optimize-sibling-calls")
 
-extern void scanstackblock(void *addr, uintptr size, void *gcw)
+extern void scanstackblock(uintptr addr, uintptr size, void *gcw)
   __asm__("runtime.scanstackblock");
 
 static bool doscanstack1(G*, void*)
@@ -84,11 +84,11 @@ static bool doscanstack1(G *gp, void *gcw) {
 		}
 	}
 	if(sp != nil) {
-		scanstackblock(sp, (uintptr)(spsize), gcw);
+		scanstackblock((uintptr)(sp), (uintptr)(spsize), gcw);
 		while((sp = __splitstack_find(next_segment, next_sp,
 					      &spsize, &next_segment,
 					      &next_sp, &initial_sp)) != nil)
-			scanstackblock(sp, (uintptr)(spsize), gcw);
+			scanstackblock((uintptr)(sp), (uintptr)(spsize), gcw);
 	}
 #else
 	byte* bottom;
-- 
2.30.2