diff --git a/src/runtime/cgo/gcc_386.S b/src/runtime/cgo/gcc_386.S
index 5bd677f4d68..d4c5934bcc1 100644
--- a/src/runtime/cgo/gcc_386.S
+++ b/src/runtime/cgo/gcc_386.S
@@ -14,20 +14,26 @@
 #endif
 
 /*
- * void crosscall_386(void (*fn)(void))
+ * void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g)
  *
- * Calling into the 8c tool chain, where all registers are caller save.
+ * Calling into the gc tool chain, where all registers are caller save.
  * Called from standard x86 ABI, where %ebp, %ebx, %esi,
  * and %edi are callee-save, so they must be saved explicitly.
  */
-.globl EXT(crosscall_386)
-EXT(crosscall_386):
+.globl EXT(crosscall1)
+EXT(crosscall1):
 	pushl %ebp
 	movl %esp, %ebp
 	pushl %ebx
 	pushl %esi
 	pushl %edi
 
+	movl 16(%ebp), %eax	/* g */
+	pushl %eax
+	movl 12(%ebp), %eax	/* setg_gcc */
+	call *%eax
+	popl %eax
+
 	movl 8(%ebp), %eax	/* fn */
 	call *%eax
 
diff --git a/src/runtime/cgo/gcc_freebsd_386.c b/src/runtime/cgo/gcc_freebsd_386.c
index e56fad6a5b9..ee4306071c6 100644
--- a/src/runtime/cgo/gcc_freebsd_386.c
+++ b/src/runtime/cgo/gcc_freebsd_386.c
@@ -47,6 +47,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	}
 }
 
+extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
 static void*
 threadentry(void *v)
 {
@@ -55,11 +56,6 @@ threadentry(void *v)
 	ts = *(ThreadStart*)v;
 	free(v);
 
-	/*
-	 * Set specific keys.
-	 */
-	setg_gcc((void*)ts.g);
-
-	crosscall_386(ts.fn);
+	crosscall1(ts.fn, setg_gcc, ts.g);
 	return nil;
 }
diff --git a/src/runtime/cgo/gcc_linux_386.c b/src/runtime/cgo/gcc_linux_386.c
index 13a5aa90dec..9c23c903087 100644
--- a/src/runtime/cgo/gcc_linux_386.c
+++ b/src/runtime/cgo/gcc_linux_386.c
@@ -50,6 +50,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	}
 }
 
+extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
 static void*
 threadentry(void *v)
 {
@@ -58,11 +59,6 @@ threadentry(void *v)
 	ts = *(ThreadStart*)v;
 	free(v);
 
-	/*
-	 * Set specific keys.
-	 */
-	setg_gcc((void*)ts.g);
-
-	crosscall_386(ts.fn);
+	crosscall1(ts.fn, setg_gcc, ts.g);
 	return nil;
 }
diff --git a/src/runtime/cgo/gcc_netbsd_386.c b/src/runtime/cgo/gcc_netbsd_386.c
index b8cb5d0bc95..2e775647189 100644
--- a/src/runtime/cgo/gcc_netbsd_386.c
+++ b/src/runtime/cgo/gcc_netbsd_386.c
@@ -46,6 +46,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	}
 }
 
+extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
 static void*
 threadentry(void *v)
 {
@@ -55,11 +56,6 @@ threadentry(void *v)
 	ts = *(ThreadStart*)v;
 	free(v);
 
-	/*
-	 * Set specific keys.
-	 */
-	setg_gcc((void*)ts.g);
-
 	// On NetBSD, a new thread inherits the signal stack of the
 	// creating thread. That confuses minit, so we remove that
 	// signal stack here before calling the regular mstart. It's
@@ -71,6 +67,6 @@ threadentry(void *v)
 	ss.ss_flags = SS_DISABLE;
 	sigaltstack(&ss, nil);
 
-	crosscall_386(ts.fn);
+	crosscall1(ts.fn, setg_gcc, ts.g);
 	return nil;
 }
diff --git a/src/runtime/cgo/gcc_openbsd_386.c b/src/runtime/cgo/gcc_openbsd_386.c
index 092da4a6d24..5fd2c2f10fb 100644
--- a/src/runtime/cgo/gcc_openbsd_386.c
+++ b/src/runtime/cgo/gcc_openbsd_386.c
@@ -46,6 +46,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	}
 }
 
+extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
 static void*
 threadentry(void *v)
 {
@@ -54,11 +55,6 @@ threadentry(void *v)
 	ts = *(ThreadStart*)v;
 	free(v);
 
-	/*
-	 * Set specific keys.
-	 */
-	setg_gcc((void*)ts.g);
-
-	crosscall_386(ts.fn);
+	crosscall1(ts.fn, setg_gcc, ts.g);
 	return nil;
 }
diff --git a/src/runtime/cgo/gcc_windows_386.c b/src/runtime/cgo/gcc_windows_386.c
index 0f4f01c7c03..983e14b7c8f 100644
--- a/src/runtime/cgo/gcc_windows_386.c
+++ b/src/runtime/cgo/gcc_windows_386.c
@@ -12,21 +12,23 @@
 #include "libcgo_windows.h"
 
 static void threadentry(void*);
+static void (*setg_gcc)(void*);
 static DWORD *tls_g;
 
 void
 x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
 {
+	setg_gcc = setg;
 	tls_g = (DWORD *)tlsg;
 }
 
-
 void
 _cgo_sys_thread_start(ThreadStart *ts)
 {
 	_cgo_beginthread(threadentry, ts);
 }
 
+extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
 static void
 threadentry(void *v)
 {
@@ -47,5 +49,5 @@ threadentry(void *v)
 		:: "r"(ts.tls), "r"(*tls_g), "r"(ts.g) : "%eax"
 	);
 
-	crosscall_386(ts.fn);
+	crosscall1(ts.fn, setg_gcc, ts.g);
 }
diff --git a/src/runtime/cgo/libcgo.h b/src/runtime/cgo/libcgo.h
index 1d2da2d0dfc..443aa2696d4 100644
--- a/src/runtime/cgo/libcgo.h
+++ b/src/runtime/cgo/libcgo.h
@@ -68,11 +68,6 @@ void _cgo_sys_thread_start(ThreadStart *ts);
  */
 uintptr_t _cgo_wait_runtime_init_done(void);
 
-/*
- * Call fn in the 8c world.
- */
-void crosscall_386(void (*fn)(void));
-
 /*
  * Prints error then calls abort. For linux and android.
  */