Add API for obtaining extended machine context states that cannot be

fit into existing mcontext_t.

On i386 and amd64 do return the extended FPU states using
getcontextx(3). For other architectures, getcontextx(3) returns the
same information as getcontext(2).

Tested by:  pho
MFC after:  1 month

19 files changed, 693 insertions, 10 deletions

diff --git a/lib/libc/amd64/gen/Makefile.inc b/lib/libc/amd64/gen/Makefile.inc
index 30fb05f..fb4f7f4 100644
--- a/lib/libc/amd64/gen/Makefile.inc
+++ b/lib/libc/amd64/gen/Makefile.inc
@@ -2,7 +2,7 @@
 # $FreeBSD$
 
 SRCS+=	_setjmp.S _set_tp.c rfork_thread.S setjmp.S sigsetjmp.S \
-	fabs.S \
+	fabs.S getcontextx.c \
 	infinity.c ldexp.c makecontext.c signalcontext.c \
 	flt_rounds.c fpgetmask.c fpsetmask.c fpgetprec.c fpsetprec.c \
 	fpgetround.c fpsetround.c fpgetsticky.c
diff --git a/lib/libc/amd64/gen/getcontextx.c b/lib/libc/amd64/gen/getcontextx.c
new file mode 100644
index 0000000..24361bc
--- /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;
+
+size_t
+__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);
+}
diff --git a/lib/libc/arm/gen/Makefile.inc b/lib/libc/arm/gen/Makefile.inc
index 56d6e2e..b47f57d 100644
--- a/lib/libc/arm/gen/Makefile.inc
+++ b/lib/libc/arm/gen/Makefile.inc
@@ -2,5 +2,5 @@
 # $FreeBSD$
 
 SRCS+=	_ctx_start.S _setjmp.S _set_tp.c alloca.S fabs.c \
-	infinity.c ldexp.c makecontext.c \
+	getcontextx.c infinity.c ldexp.c makecontext.c \
 	setjmp.S signalcontext.c sigsetjmp.S divsi3.S flt_rounds.c
diff --git a/lib/libc/arm/gen/getcontextx.c b/lib/libc/arm/gen/getcontextx.c
new file mode 100644
index 0000000..b701c18
--- /dev/null
+++ b/lib/libc/arm/gen/getcontextx.c
@@ -0,0 +1,69 @@
+/*
+ * 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 <stdlib.h>
+
+size_t
+__getcontextx_size(void)
+{
+
+	return (sizeof(ucontext_t));
+}
+
+int
+__fillcontextx(char *ctx)
+{
+	ucontext_t *ucp;
+
+	ucp = (ucontext_t *)ctx;
+	return (getcontext(ucp));
+}
+
+__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);
+}
diff --git a/lib/libc/gen/Symbol.map b/lib/libc/gen/Symbol.map
index e00e746..d794c0a 100644
--- a/lib/libc/gen/Symbol.map
+++ b/lib/libc/gen/Symbol.map
@@ -384,6 +384,7 @@ FBSD_1.2 {
 FBSD_1.3 {
 	 fdlopen;
 	__FreeBSD_libc_enter_restricted_mode;
+	getcontextx;
 };
 
 FBSDprivate_1.0 {
@@ -507,4 +508,6 @@ FBSDprivate_1.0 {
 
 	__elf_aux_vector;
 	__pthread_map_stacks_exec;
+	__fillcontextx;
+	__getcontextx_size;
 };
diff --git a/lib/libc/gen/getcontext.3 b/lib/libc/gen/getcontext.3
index 2fda6b8..5b801fd 100644
--- a/lib/libc/gen/getcontext.3
+++ b/lib/libc/gen/getcontext.3
@@ -35,11 +35,11 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd September 10, 2002
+.Dd December 26, 2011
 .Dt GETCONTEXT 3
 .Os
 .Sh NAME
-.Nm getcontext , setcontext
+.Nm getcontext , getcontextx , setcontext
 .Nd get and set user thread context
 .Sh LIBRARY
 .Lb libc
@@ -59,6 +59,20 @@ This saved context may then later be restored by calling
 .Fn setcontext .
 .Pp
 The
+.Fn getcontextx
+function saves the current execution context in the newly allocated structure
+.Vt ucontext_t ,
+which is returned on success.
+If architecture defines additional CPU states that can be stored in extended
+blocks referenced from the
+.Vt ucontext_t ,
+the memory for them may be allocated and their context also stored.
+Memory returned by
+.Fn getcontextx
+function shall be freed using
+.Fn free 3 .
+.Pp
+The
 .Fn setcontext
 function
 makes a previously saved thread context the current thread context, i.e.,
@@ -109,11 +123,24 @@ If successful,
 returns zero and
 .Fn setcontext
 does not return; otherwise \-1 is returned.
+The
+.Fn getcontextx
+returns pointer to the allocated and initialized context on success, and
+.Va NULL
+on failure.
 .Sh ERRORS
 No errors are defined for
 .Fn getcontext
 or
 .Fn setcontext .
+The
+.Fn getcontextx
+may return the following errors in
+.Va errno :
+.Bl -tag -width Er
+.It Bq Er ENOMEM
+No memory was available to allocate for the context or some extended state.
+.El
 .Sh SEE ALSO
 .Xr sigaction 2 ,
 .Xr sigaltstack 2 ,
diff --git a/lib/libc/gen/ucontext.3 b/lib/libc/gen/ucontext.3
index 0574322..69ecbc1 100644
--- a/lib/libc/gen/ucontext.3
+++ b/lib/libc/gen/ucontext.3
@@ -92,6 +92,9 @@ structures:
 .Ft int
 .Fn getcontext "ucontext_t *" ;
 .It
+.Ft "ucontext_t *"
+.Fn getcontextx "void" ;
+.It
 .Ft int
 .Fn setcontext "const ucontext_t *" ;
 .It
@@ -104,4 +107,5 @@ structures:
 .Sh SEE ALSO
 .Xr sigaltstack 2 ,
 .Xr getcontext 3 ,
+.Xr getcontextx 3 ,
 .Xr makecontext 3
diff --git a/lib/libc/i386/gen/Makefile.inc b/lib/libc/i386/gen/Makefile.inc
index 45e69ca..73dcabb 100644
--- a/lib/libc/i386/gen/Makefile.inc
+++ b/lib/libc/i386/gen/Makefile.inc
@@ -2,5 +2,5 @@
 # $FreeBSD$
 
 SRCS+=	_ctx_start.S _setjmp.S _set_tp.c fabs.S \
-	flt_rounds.c infinity.c ldexp.c makecontext.c \
+	flt_rounds.c getcontextx.c infinity.c ldexp.c makecontext.c \
 	rfork_thread.S setjmp.S signalcontext.c sigsetjmp.S
diff --git a/lib/libc/i386/gen/getcontextx.c b/lib/libc/i386/gen/getcontextx.c
new file mode 100644
index 0000000..de0a1a3
--- /dev/null
+++ b/lib/libc/i386/gen/getcontextx.c
@@ -0,0 +1,133 @@
+/*
+ * 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/npx.h>
+#include <machine/specialreg.h>
+#include <machine/sysarch.h>
+
+static int xstate_sz = -1;
+
+size_t
+__getcontextx_size(void)
+{
+	u_int p[4];
+	int cpuid_supported;
+
+	if (xstate_sz == -1) {
+		__asm __volatile(
+		    "	pushfl\n"
+		    "	popl	%%eax\n"
+		    "	movl    %%eax,%%ecx\n"
+		    "	xorl    $0x200000,%%eax\n"
+		    "	pushl	%%eax\n"
+		    "	popfl\n"
+		    "	pushfl\n"
+		    "	popl    %%eax\n"
+		    "	xorl    %%eax,%%ecx\n"
+		    "	je	1f\n"
+		    "	movl	$1,%0\n"
+		    "	jmp	2f\n"
+		    "1:	movl	$0,%0\n"
+		    "2:\n"
+		    : "=r" (cpuid_supported) : : "eax", "ecx");
+		if (cpuid_supported) {
+			__asm __volatile(
+			    "	pushl	%%ebx\n"
+			    "	cpuid\n"
+			    "	movl	%%ebx,%1\n"
+			    "	popl	%%ebx\n"
+			    : "=a" (p[0]), "=r" (p[1]), "=c" (p[2]), "=d" (p[3])
+			    :  "0" (0x0));
+			if ((p[2] & CPUID2_OSXSAVE) != 0) {
+				__asm __volatile(
+				    "	pushl	%%ebx\n"
+				    "	cpuid\n"
+				    "	movl	%%ebx,%1\n"
+				    "	popl	%%ebx\n"
+				    : "=a" (p[0]), "=r" (p[1]), "=c" (p[2]),
+					"=d" (p[3])
+				    :  "0" (0xd), "2" (0x0));
+				xstate_sz = p[1] - sizeof(struct savexmm);
+			} else
+				xstate_sz = 0;
+		} else
+			xstate_sz = 0;
+	}
+
+	return (sizeof(ucontext_t) + xstate_sz);
+}
+
+int
+__fillcontextx(char *ctx)
+{
+	struct i386_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(I386_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);
+}
diff --git a/lib/libc/ia64/gen/Makefile.inc b/lib/libc/ia64/gen/Makefile.inc
index 685ab86..1e3373a 100644
--- a/lib/libc/ia64/gen/Makefile.inc
+++ b/lib/libc/ia64/gen/Makefile.inc
@@ -3,7 +3,7 @@
 SRCS+=	__divdf3.S __divdi3.S __divsf3.S __divsi3.S __moddi3.S __modsi3.S \
 	__udivdi3.S __udivsi3.S __umoddi3.S __umodsi3.S _mcount.S _set_tp.c \
 	_setjmp.S fabs.S flt_rounds.c fpgetmask.c fpgetround.c fpsetmask.c \
-	fpsetround.c infinity.c ldexp.c makecontext.c setjmp.S \
+	fpsetround.c getcontextx.c infinity.c ldexp.c makecontext.c setjmp.S \
 	signalcontext.c sigsetjmp.S
 
 # The following may go away if function _Unwind_FindTableEntry()
diff --git a/lib/libc/ia64/gen/getcontextx.c b/lib/libc/ia64/gen/getcontextx.c
new file mode 100644
index 0000000..b701c18
--- /dev/null
+++ b/lib/libc/ia64/gen/getcontextx.c
@@ -0,0 +1,69 @@
+/*
+ * 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 <stdlib.h>
+
+size_t
+__getcontextx_size(void)
+{
+
+	return (sizeof(ucontext_t));
+}
+
+int
+__fillcontextx(char *ctx)
+{
+	ucontext_t *ucp;
+
+	ucp = (ucontext_t *)ctx;
+	return (getcontext(ucp));
+}
+
+__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);
+}
diff --git a/lib/libc/mips/gen/Makefile.inc b/lib/libc/mips/gen/Makefile.inc
index 8ee69d0..9d9cc7a 100644
--- a/lib/libc/mips/gen/Makefile.inc
+++ b/lib/libc/mips/gen/Makefile.inc
@@ -6,4 +6,5 @@ SRCS+=	infinity.c fabs.c ldexp.c
 # SRCS+=	flt_rounds.c fpgetmask.c fpgetround.c fpgetsticky.c fpsetmask.c \
 #	fpsetround.c fpsetsticky.c
 
-SRCS+=	_ctx_start.S _set_tp.c _setjmp.S makecontext.c setjmp.S signalcontext.c sigsetjmp.S
+SRCS+=	_ctx_start.S _set_tp.c _setjmp.S getcontextx.c makecontext.c \
+	setjmp.S signalcontext.c sigsetjmp.S
diff --git a/lib/libc/mips/gen/getcontextx.c b/lib/libc/mips/gen/getcontextx.c
new file mode 100644
index 0000000..b701c18
--- /dev/null
+++ b/lib/libc/mips/gen/getcontextx.c
@@ -0,0 +1,69 @@
+/*
+ * 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 <stdlib.h>
+
+size_t
+__getcontextx_size(void)
+{
+
+	return (sizeof(ucontext_t));
+}
+
+int
+__fillcontextx(char *ctx)
+{
+	ucontext_t *ucp;
+
+	ucp = (ucontext_t *)ctx;
+	return (getcontext(ucp));
+}
+
+__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);
+}
diff --git a/lib/libc/powerpc/gen/Makefile.inc b/lib/libc/powerpc/gen/Makefile.inc
index 3bfabda..79a2746 100644
--- a/lib/libc/powerpc/gen/Makefile.inc
+++ b/lib/libc/powerpc/gen/Makefile.inc
@@ -1,7 +1,7 @@
 # $FreeBSD$
 
 SRCS += _ctx_start.S fabs.S flt_rounds.c fpgetmask.c fpgetround.c \
-	fpgetsticky.c fpsetmask.c fpsetround.c \
+	fpgetsticky.c fpsetmask.c fpsetround.c getcontextx.c \
 	infinity.c ldexp.c makecontext.c _setjmp.S \
 	setjmp.S sigsetjmp.S signalcontext.c syncicache.c \
 	_set_tp.c
diff --git a/lib/libc/powerpc/gen/getcontextx.c b/lib/libc/powerpc/gen/getcontextx.c
new file mode 100644
index 0000000..b701c18
--- /dev/null
+++ b/lib/libc/powerpc/gen/getcontextx.c
@@ -0,0 +1,69 @@
+/*
+ * 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 <stdlib.h>
+
+size_t
+__getcontextx_size(void)
+{
+
+	return (sizeof(ucontext_t));
+}
+
+int
+__fillcontextx(char *ctx)
+{
+	ucontext_t *ucp;
+
+	ucp = (ucontext_t *)ctx;
+	return (getcontext(ucp));
+}
+
+__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);
+}
diff --git a/lib/libc/powerpc64/gen/Makefile.inc b/lib/libc/powerpc64/gen/Makefile.inc
index 3bfabda..79a2746 100644
--- a/lib/libc/powerpc64/gen/Makefile.inc
+++ b/lib/libc/powerpc64/gen/Makefile.inc
@@ -1,7 +1,7 @@
 # $FreeBSD$
 
 SRCS += _ctx_start.S fabs.S flt_rounds.c fpgetmask.c fpgetround.c \
-	fpgetsticky.c fpsetmask.c fpsetround.c \
+	fpgetsticky.c fpsetmask.c fpsetround.c getcontextx.c \
 	infinity.c ldexp.c makecontext.c _setjmp.S \
 	setjmp.S sigsetjmp.S signalcontext.c syncicache.c \
 	_set_tp.c
diff --git a/lib/libc/powerpc64/gen/getcontextx.c b/lib/libc/powerpc64/gen/getcontextx.c
new file mode 100644
index 0000000..b701c18
--- /dev/null
+++ b/lib/libc/powerpc64/gen/getcontextx.c
@@ -0,0 +1,69 @@
+/*
+ * 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 <stdlib.h>
+
+size_t
+__getcontextx_size(void)
+{
+
+	return (sizeof(ucontext_t));
+}
+
+int
+__fillcontextx(char *ctx)
+{
+	ucontext_t *ucp;
+
+	ucp = (ucontext_t *)ctx;
+	return (getcontext(ucp));
+}
+
+__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);
+}
diff --git a/lib/libc/sparc64/gen/Makefile.inc b/lib/libc/sparc64/gen/Makefile.inc
index f82f225..d3fbfe4 100644
--- a/lib/libc/sparc64/gen/Makefile.inc
+++ b/lib/libc/sparc64/gen/Makefile.inc
@@ -2,5 +2,5 @@
 
 SRCS+=	_ctx_start.S _setjmp.S fabs.S fixunsdfsi.S flt_rounds.c fpgetmask.c \
 	fpgetround.c fpgetsticky.c fpsetmask.c fpsetround.c \
-	infinity.c ldexp.c makecontext.c \
+	getcontextx.c infinity.c ldexp.c makecontext.c \
 	signalcontext.c setjmp.S sigsetjmp.S _set_tp.c
diff --git a/lib/libc/sparc64/gen/getcontextx.c b/lib/libc/sparc64/gen/getcontextx.c
new file mode 100644
index 0000000..b701c18
--- /dev/null
+++ b/lib/libc/sparc64/gen/getcontextx.c
@@ -0,0 +1,69 @@
+/*
+ * 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 <stdlib.h>
+
+size_t
+__getcontextx_size(void)
+{
+
+	return (sizeof(ucontext_t));
+}
+
+int
+__fillcontextx(char *ctx)
+{
+	ucontext_t *ucp;
+
+	ucp = (ucontext_t *)ctx;
+	return (getcontext(ucp));
+}
+
+__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);
+}