26b40ef78f
The content of this branch was automatically imported from Fedora ELN with the following as its source: https://src.fedoraproject.org/rpms/java-1.8.0-openjdk#f805bfcfda0b8f4d8cb73219c5604fee0ed6a9cd
45 lines
1.4 KiB
Diff
45 lines
1.4 KiB
Diff
diff --git openjdk.orig/hotspot/src/os/linux/vm/os_linux.cpp openjdk/hotspot/src/os/linux/vm/os_linux.cpp
|
|
--- openjdk.orig/hotspot/src/os/linux/vm/os_linux.cpp
|
|
+++ openjdk/hotspot/src/os/linux/vm/os_linux.cpp
|
|
@@ -103,6 +103,8 @@
|
|
# include <inttypes.h>
|
|
# include <sys/ioctl.h>
|
|
|
|
+#include <sys/prctl.h>
|
|
+
|
|
PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
|
|
|
|
#ifndef _GNU_SOURCE
|
|
@@ -4997,6 +4999,31 @@
|
|
}
|
|
}
|
|
|
|
+/* Per task speculation control */
|
|
+#ifndef PR_GET_SPECULATION_CTRL
|
|
+#define PR_GET_SPECULATION_CTRL 52
|
|
+#endif
|
|
+#ifndef PR_SET_SPECULATION_CTRL
|
|
+#define PR_SET_SPECULATION_CTRL 53
|
|
+#endif
|
|
+/* Speculation control variants */
|
|
+# undef PR_SPEC_STORE_BYPASS
|
|
+# define PR_SPEC_STORE_BYPASS 0
|
|
+/* Return and control values for PR_SET/GET_SPECULATION_CTRL */
|
|
+# undef PR_SPEC_NOT_AFFECTED
|
|
+# undef PR_SPEC_PRCTL
|
|
+# undef PR_SPEC_ENABLE
|
|
+# undef PR_SPEC_DISABLE
|
|
+# define PR_SPEC_NOT_AFFECTED 0
|
|
+# define PR_SPEC_PRCTL (1UL << 0)
|
|
+# define PR_SPEC_ENABLE (1UL << 1)
|
|
+# define PR_SPEC_DISABLE (1UL << 2)
|
|
+
|
|
+static void set_speculation() __attribute__((constructor));
|
|
+static void set_speculation() {
|
|
+ prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_DISABLE, 0, 0);
|
|
+}
|
|
+
|
|
// this is called _before_ most of the global arguments have been parsed
|
|
void os::init(void) {
|
|
char dummy; /* used to get a guess on initial stack address */
|