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path: root/src/runtime/memmove_linux_amd64_test.go
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Diffstat (limited to 'src/runtime/memmove_linux_amd64_test.go')
-rw-r--r--src/runtime/memmove_linux_amd64_test.go61
1 files changed, 61 insertions, 0 deletions
diff --git a/src/runtime/memmove_linux_amd64_test.go b/src/runtime/memmove_linux_amd64_test.go
new file mode 100644
index 000000000..f7221f4f5
--- /dev/null
+++ b/src/runtime/memmove_linux_amd64_test.go
@@ -0,0 +1,61 @@
+// Copyright 2013 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_test
+
+import (
+ "io/ioutil"
+ "os"
+ "reflect"
+ "syscall"
+ "testing"
+ "unsafe"
+)
+
+// TestMemmoveOverflow maps 3GB of memory and calls memmove on
+// the corresponding slice.
+func TestMemmoveOverflow(t *testing.T) {
+ // Create a temporary file.
+ tmp, err := ioutil.TempFile("", "go-memmovetest")
+ if err != nil {
+ t.Fatal(err)
+ }
+ _, err = tmp.Write(make([]byte, 65536))
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer os.Remove(tmp.Name())
+ defer tmp.Close()
+
+ // Set up mappings.
+ base, _, errno := syscall.Syscall6(syscall.SYS_MMAP,
+ 0xa0<<32, 3<<30, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_PRIVATE|syscall.MAP_ANONYMOUS, ^uintptr(0), 0)
+ if errno != 0 {
+ t.Skipf("could not create memory mapping: %s", errno)
+ }
+ syscall.Syscall(syscall.SYS_MUNMAP, base, 3<<30, 0)
+
+ for off := uintptr(0); off < 3<<30; off += 65536 {
+ _, _, errno := syscall.Syscall6(syscall.SYS_MMAP,
+ base+off, 65536, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED|syscall.MAP_FIXED, tmp.Fd(), 0)
+ if errno != 0 {
+ t.Fatalf("could not map a page at requested 0x%x: %s", base+off, errno)
+ }
+ defer syscall.Syscall(syscall.SYS_MUNMAP, base+off, 65536, 0)
+ }
+
+ var s []byte
+ sp := (*reflect.SliceHeader)(unsafe.Pointer(&s))
+ sp.Data = base
+ sp.Len, sp.Cap = 3<<30, 3<<30
+
+ n := copy(s[1:], s)
+ if n != 3<<30-1 {
+ t.Fatalf("copied %d bytes, expected %d", n, 3<<30-1)
+ }
+ n = copy(s, s[1:])
+ if n != 3<<30-1 {
+ t.Fatalf("copied %d bytes, expected %d", n, 3<<30-1)
+ }
+}