Update package locations.

Because the abi will depend on the core types for marshalling (usermem,
context, safemem, safecopy), these need to be flattened from the sentry
directory. These packages contain no sentry-specific details.

PiperOrigin-RevId: 291811289

pkg/abi/abi.go

@@ -39,3 +39,7 @@ func (o OS) String() string {
 		return fmt.Sprintf("OS(%d)", o)
 	}
 }
+
+// ABI is an interface that defines OS-specific interactions.
+type ABI interface {
+}

pkg/context/BUILD

@@ -5,7 +5,7 @@ package(licenses = ["notice"])
 go_library(
     name = "context",
     srcs = ["context.go"],
-    visibility = ["//pkg/sentry:internal"],
+    visibility = ["//:sandbox"],
     deps = [
         "//pkg/amutex",
         "//pkg/log",

pkg/safecopy/BUILD

@@ -16,7 +16,7 @@ go_library(
         "sighandler_amd64.s",
         "sighandler_arm64.s",
     ],
-    visibility = ["//pkg/sentry:internal"],
+    visibility = ["//:sandbox"],
     deps = ["//pkg/syserror"],
 )
 

pkg/safemem/BUILD

@@ -10,9 +10,9 @@ go_library(
         "safemem.go",
         "seq_unsafe.go",
     ],
-    visibility = ["//pkg/sentry:internal"],
+    visibility = ["//:sandbox"],
     deps = [
-        "//pkg/sentry/platform/safecopy",
+        "//pkg/safecopy",
     ],
 )
 

pkg/safemem/block_unsafe.go

@@ -19,7 +19,7 @@ import (
 	"reflect"
 	"unsafe"
 
-	"gvisor.dev/gvisor/pkg/sentry/platform/safecopy"
+	"gvisor.dev/gvisor/pkg/safecopy"
 )
 
 // A Block is a range of contiguous bytes, similar to []byte but with the