diff --git a/src/runtime/defs_linux_386.go b/src/runtime/defs_linux_386.go
index ba349845cf..ba5ef18e02 100644
--- a/src/runtime/defs_linux_386.go
+++ b/src/runtime/defs_linux_386.go
@@ -227,3 +227,14 @@ type sockaddr_un struct {
 	family uint16
 	path   [108]byte
 }
+
+const __NEW_UTS_LEN = 64
+
+type new_utsname struct {
+	sysname    [__NEW_UTS_LEN + 1]byte
+	nodename   [__NEW_UTS_LEN + 1]byte
+	release    [__NEW_UTS_LEN + 1]byte
+	version    [__NEW_UTS_LEN + 1]byte
+	machine    [__NEW_UTS_LEN + 1]byte
+	domainname [__NEW_UTS_LEN + 1]byte
+}
diff --git a/src/runtime/os_linux_386.go b/src/runtime/os_linux_386.go
deleted file mode 100644
index 9be88a5ad2..0000000000
--- a/src/runtime/os_linux_386.go
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright 2019 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 runtime
-
-func osArchInit() {}
diff --git a/src/runtime/os_linux_amd64.go b/src/runtime/os_linux_x86.go
similarity index 98%
rename from src/runtime/os_linux_amd64.go
rename to src/runtime/os_linux_x86.go
index cbfcf2e40a..61c51f2327 100644
--- a/src/runtime/os_linux_amd64.go
+++ b/src/runtime/os_linux_x86.go
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux
+// +build 386 amd64
+
 package runtime
 
 //go:noescape
diff --git a/src/runtime/sys_linux_386.s b/src/runtime/sys_linux_386.s
index 373d9d3bc2..8e05acf894 100644
--- a/src/runtime/sys_linux_386.s
+++ b/src/runtime/sys_linux_386.s
@@ -39,6 +39,8 @@
 #define SYS_socketcall		102
 #define SYS_setittimer		104
 #define SYS_clone		120
+#define SYS_uname		122
+#define SYS_mlock		150
 #define SYS_sched_yield 	158
 #define SYS_nanosleep		162
 #define SYS_rt_sigreturn	173
@@ -776,3 +778,20 @@ TEXT runtime·sbrk0(SB),NOSPLIT,$0-4
 	INVOKE_SYSCALL
 	MOVL	AX, ret+0(FP)
 	RET
+
+// func uname(utsname *new_utsname) int
+TEXT ·uname(SB),NOSPLIT,$0-8
+	MOVL    $SYS_uname, AX
+	MOVL    utsname+0(FP), BX
+	INVOKE_SYSCALL
+	MOVL	AX, ret+4(FP)
+	RET
+
+// func mlock(addr, len uintptr) int
+TEXT ·mlock(SB),NOSPLIT,$0-12
+	MOVL    $SYS_mlock, AX
+	MOVL    addr+0(FP), BX
+	MOVL    len+4(FP), CX
+	INVOKE_SYSCALL
+	MOVL	AX, ret+8(FP)
+	RET