diff --git a/libc/kernel/arch-arm/asm/ucontext.h b/libc/kernel/arch-arm/asm/ucontext.h
new file mode 100644
index 0000000..b9a879d
--- /dev/null
+++ b/libc/kernel/arch-arm/asm/ucontext.h
@@ -0,0 +1,34 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _ASMARM_UCONTEXT_H
+#define _ASMARM_UCONTEXT_H
+#include <asm/fpstate.h>
+struct ucontext {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ unsigned long uc_flags;
+ struct ucontext *uc_link;
+ stack_t uc_stack;
+ struct sigcontext uc_mcontext;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ sigset_t uc_sigmask;
+ int _unused[32 - (sizeof (sigset_t) / sizeof (int))];
+ unsigned long uc_regspace[128] __attribute__((__aligned__(8)));
+};
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif
diff --git a/libc/kernel/arch-mips/asm/ucontext.h b/libc/kernel/arch-mips/asm/ucontext.h
new file mode 100644
index 0000000..aa4d67d
--- /dev/null
+++ b/libc/kernel/arch-mips/asm/ucontext.h
@@ -0,0 +1,19 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#include <asm-generic/ucontext.h>
diff --git a/libc/kernel/arch-x86/asm/ucontext.h b/libc/kernel/arch-x86/asm/ucontext.h
new file mode 100644
index 0000000..e2326e5
--- /dev/null
+++ b/libc/kernel/arch-x86/asm/ucontext.h
@@ -0,0 +1,24 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _ASM_X86_UCONTEXT_H
+#define _ASM_X86_UCONTEXT_H
+#define UC_FP_XSTATE 0x1  
+#include <asm-generic/ucontext.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif
diff --git a/libc/kernel/common/asm-generic/ucontext.h b/libc/kernel/common/asm-generic/ucontext.h
new file mode 100644
index 0000000..f26d1cc
--- /dev/null
+++ b/libc/kernel/common/asm-generic/ucontext.h
@@ -0,0 +1,30 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef __ASM_GENERIC_UCONTEXT_H
+#define __ASM_GENERIC_UCONTEXT_H
+struct ucontext {
+ unsigned long uc_flags;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ struct ucontext *uc_link;
+ stack_t uc_stack;
+ struct sigcontext uc_mcontext;
+ sigset_t uc_sigmask;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+};
+#endif