1 files changed, 101 insertions, 0 deletions
diff --git a/lib/libc/amd64/gen/getcontextx.c b/lib/libc/amd64/gen/getcontextx.c
new file mode 100644
index 0000000..7412560
--- /dev/null
+++ b/lib/libc/amd64/gen/getcontextx.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/ucontext.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <machine/cpufunc.h>
+#include <machine/fpu.h>
+#include <machine/specialreg.h>
+#include <machine/sysarch.h>
+
+static int xstate_sz = -1;
+
+int
+__getcontextx_size(void)
+{
+	u_int p[4];
+
+	if (xstate_sz == -1) {
+		do_cpuid(1, p);
+		if ((p[2] & CPUID2_OSXSAVE) != 0) {
+			cpuid_count(0xd, 0x0, p);
+			xstate_sz = p[1] - sizeof(struct savefpu);
+		} else
+			xstate_sz = 0;
+	}
+
+	return (sizeof(ucontext_t) + xstate_sz);
+}
+
+int
+__fillcontextx(char *ctx)
+{
+	struct amd64_get_xfpustate xfpu;
+	ucontext_t *ucp;
+
+	ucp = (ucontext_t *)ctx;
+	if (getcontext(ucp) == -1)
+		return (-1);
+	if (xstate_sz != 0) {
+		xfpu.addr = (char *)(ucp + 1);
+		xfpu.len = xstate_sz;
+		if (sysarch(AMD64_GET_XFPUSTATE, &xfpu) == -1)
+			return (-1);
+		ucp->uc_mcontext.mc_xfpustate = (__register_t)xfpu.addr;
+		ucp->uc_mcontext.mc_xfpustate_len = xstate_sz;
+		ucp->uc_mcontext.mc_flags |= _MC_HASFPXSTATE;
+	} else {
+		ucp->uc_mcontext.mc_xfpustate = 0;
+		ucp->uc_mcontext.mc_xfpustate_len = 0;
+	}
+	return (0);
+}
+
+__weak_reference(__getcontextx, getcontextx);
+
+ucontext_t *
+__getcontextx(void)
+{
+	char *ctx;
+	int error;
+
+	ctx = malloc(__getcontextx_size());
+	if (ctx == NULL)
+		return (NULL);
+	if (__fillcontextx(ctx) == -1) {
+		error = errno;
+		free(ctx);
+		errno = error;
+		return (NULL);
+	}
+	return ((ucontext_t *)ctx);
+}