diff --git a/libc/kernel/uapi/asm-x86/asm/mman.h b/libc/kernel/uapi/asm-x86/asm/mman.h
index 1061a6f..693ab82 100644
--- a/libc/kernel/uapi/asm-x86/asm/mman.h
+++ b/libc/kernel/uapi/asm-x86/asm/mman.h
@@ -19,5 +19,7 @@
 #ifndef _ASM_X86_MMAN_H
 #define _ASM_X86_MMAN_H
 #define MAP_32BIT 0x40
+#define MAP_ABOVE4G 0x80
+#define SHADOW_STACK_SET_TOKEN (1ULL << 0)
 #include <asm-generic/mman.h>
 #endif
diff --git a/libc/kernel/uapi/asm-x86/asm/prctl.h b/libc/kernel/uapi/asm-x86/asm/prctl.h
index e2fe9df..51b0035 100644
--- a/libc/kernel/uapi/asm-x86/asm/prctl.h
+++ b/libc/kernel/uapi/asm-x86/asm/prctl.h
@@ -38,4 +38,11 @@
 #define ARCH_ENABLE_TAGGED_ADDR 0x4002
 #define ARCH_GET_MAX_TAG_BITS 0x4003
 #define ARCH_FORCE_TAGGED_SVA 0x4004
+#define ARCH_SHSTK_ENABLE 0x5001
+#define ARCH_SHSTK_DISABLE 0x5002
+#define ARCH_SHSTK_LOCK 0x5003
+#define ARCH_SHSTK_UNLOCK 0x5004
+#define ARCH_SHSTK_STATUS 0x5005
+#define ARCH_SHSTK_SHSTK (1ULL << 0)
+#define ARCH_SHSTK_WRSS (1ULL << 1)
 #endif
diff --git a/libc/kernel/uapi/asm-x86/asm/unistd_32.h b/libc/kernel/uapi/asm-x86/asm/unistd_32.h
index f9d8dbd..19155f2 100644
--- a/libc/kernel/uapi/asm-x86/asm/unistd_32.h
+++ b/libc/kernel/uapi/asm-x86/asm/unistd_32.h
@@ -459,4 +459,5 @@
 #define __NR_futex_waitv 449
 #define __NR_set_mempolicy_home_node 450
 #define __NR_cachestat 451
+#define __NR_fchmodat2 452
 #endif
diff --git a/libc/kernel/uapi/asm-x86/asm/unistd_64.h b/libc/kernel/uapi/asm-x86/asm/unistd_64.h
index 34a9ecc..7cb6d0d 100644
--- a/libc/kernel/uapi/asm-x86/asm/unistd_64.h
+++ b/libc/kernel/uapi/asm-x86/asm/unistd_64.h
@@ -381,4 +381,6 @@
 #define __NR_futex_waitv 449
 #define __NR_set_mempolicy_home_node 450
 #define __NR_cachestat 451
+#define __NR_fchmodat2 452
+#define __NR_map_shadow_stack 453
 #endif
diff --git a/libc/kernel/uapi/asm-x86/asm/unistd_x32.h b/libc/kernel/uapi/asm-x86/asm/unistd_x32.h
index de6c857..386e66c 100644
--- a/libc/kernel/uapi/asm-x86/asm/unistd_x32.h
+++ b/libc/kernel/uapi/asm-x86/asm/unistd_x32.h
@@ -334,6 +334,7 @@
 #define __NR_futex_waitv (__X32_SYSCALL_BIT + 449)
 #define __NR_set_mempolicy_home_node (__X32_SYSCALL_BIT + 450)
 #define __NR_cachestat (__X32_SYSCALL_BIT + 451)
+#define __NR_fchmodat2 (__X32_SYSCALL_BIT + 452)
 #define __NR_rt_sigaction (__X32_SYSCALL_BIT + 512)
 #define __NR_rt_sigreturn (__X32_SYSCALL_BIT + 513)
 #define __NR_ioctl (__X32_SYSCALL_BIT + 514)