62 lines
1.8 KiB
Diff
62 lines
1.8 KiB
Diff
diff --git openjdk/src/hotspot/os/linux/os_linux.cpp openjdk/src/hotspot/os/linux/os_linux.cpp
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--- openjdk/src/hotspot/os/linux/os_linux.cpp
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+++ openjdk/src/hotspot/os/linux/os_linux.cpp
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@@ -107,6 +107,8 @@
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# include <inttypes.h>
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# include <sys/ioctl.h>
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+#include <sys/prctl.h>
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+
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#include <sched.h>
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@@ -4984,6 +4986,48 @@
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extern void report_error(char* file_name, int line_no, char* title,
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char* format, ...);
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+/* Per task speculation control */
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+#ifndef PR_GET_SPECULATION_CTRL
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+# define PR_GET_SPECULATION_CTRL 52
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+#endif
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+#ifndef PR_SET_SPECULATION_CTRL
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+# define PR_SET_SPECULATION_CTRL 53
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+#endif
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+/* Speculation control variants */
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+#ifndef PR_SPEC_STORE_BYPASS
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+# define PR_SPEC_STORE_BYPASS 0
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+#endif
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+/* Return and control values for PR_SET/GET_SPECULATION_CTRL */
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+
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+#ifndef PR_SPEC_NOT_AFFECTED
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+# define PR_SPEC_NOT_AFFECTED 0
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+#endif
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+#ifndef PR_SPEC_PRCTL
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+# define PR_SPEC_PRCTL (1UL << 0)
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+#endif
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+#ifndef PR_SPEC_ENABLE
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+# define PR_SPEC_ENABLE (1UL << 1)
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+#endif
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+#ifndef PR_SPEC_DISABLE
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+# define PR_SPEC_DISABLE (1UL << 2)
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+#endif
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+#ifndef PR_SPEC_FORCE_DISABLE
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+# define PR_SPEC_FORCE_DISABLE (1UL << 3)
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+#endif
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+#ifndef PR_SPEC_DISABLE_NOEXEC
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+# define PR_SPEC_DISABLE_NOEXEC (1UL << 4)
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+#endif
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+
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+static void set_speculation() __attribute__((constructor));
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+static void set_speculation() {
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+ if ( prctl(PR_SET_SPECULATION_CTRL,
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+ PR_SPEC_STORE_BYPASS,
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+ PR_SPEC_DISABLE_NOEXEC, 0, 0) == 0 ) {
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+ return;
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+ }
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+ prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_DISABLE, 0, 0);
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+}
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+
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// this is called _before_ most of the global arguments have been parsed
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void os::init(void) {
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char dummy; // used to get a guess on initial stack address
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