diff --git a/libc/kernel/uapi/asm-arm64/asm/hwcap.h b/libc/kernel/uapi/asm-arm64/asm/hwcap.h
index f5c720a..45cc945 100644
--- a/libc/kernel/uapi/asm-arm64/asm/hwcap.h
+++ b/libc/kernel/uapi/asm-arm64/asm/hwcap.h
@@ -101,4 +101,5 @@
 #define HWCAP2_SME_SF8FMA (1UL << 60)
 #define HWCAP2_SME_SF8DP4 (1UL << 61)
 #define HWCAP2_SME_SF8DP2 (1UL << 62)
+#define HWCAP2_POE (1UL << 63)
 #endif
diff --git a/libc/kernel/uapi/asm-arm64/asm/mman.h b/libc/kernel/uapi/asm-arm64/asm/mman.h
index 1561053..cc92abe 100644
--- a/libc/kernel/uapi/asm-arm64/asm/mman.h
+++ b/libc/kernel/uapi/asm-arm64/asm/mman.h
@@ -9,4 +9,8 @@
 #include <asm-generic/mman.h>
 #define PROT_BTI 0x10
 #define PROT_MTE 0x20
+#define PKEY_DISABLE_EXECUTE 0x4
+#define PKEY_DISABLE_READ 0x8
+#undef PKEY_ACCESS_MASK
+#define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE | PKEY_DISABLE_READ | PKEY_DISABLE_EXECUTE)
 #endif
diff --git a/libc/kernel/uapi/asm-arm64/asm/sigcontext.h b/libc/kernel/uapi/asm-arm64/asm/sigcontext.h
index 8e48d55..a845a03 100644
--- a/libc/kernel/uapi/asm-arm64/asm/sigcontext.h
+++ b/libc/kernel/uapi/asm-arm64/asm/sigcontext.h
@@ -32,6 +32,11 @@
   struct _aarch64_ctx head;
   __u64 esr;
 };
+#define POE_MAGIC 0x504f4530
+struct poe_context {
+  struct _aarch64_ctx head;
+  __u64 por_el0;
+};
 #define EXTRA_MAGIC 0x45585401
 struct extra_context {
   struct _aarch64_ctx head;
@@ -95,12 +100,12 @@
 #define SVE_SIG_REGS_SIZE(vq) (__SVE_FFR_OFFSET(vq) + __SVE_FFR_SIZE(vq))
 #define SVE_SIG_CONTEXT_SIZE(vq) (SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq))
 #define ZA_SIG_REGS_OFFSET ((sizeof(struct za_context) + (__SVE_VQ_BYTES - 1)) / __SVE_VQ_BYTES * __SVE_VQ_BYTES)
-#define ZA_SIG_REGS_SIZE(vq) ((vq * __SVE_VQ_BYTES) * (vq * __SVE_VQ_BYTES))
-#define ZA_SIG_ZAV_OFFSET(vq,n) (ZA_SIG_REGS_OFFSET + (SVE_SIG_ZREG_SIZE(vq) * n))
+#define ZA_SIG_REGS_SIZE(vq) (((vq) * __SVE_VQ_BYTES) * ((vq) * __SVE_VQ_BYTES))
+#define ZA_SIG_ZAV_OFFSET(vq,n) (ZA_SIG_REGS_OFFSET + (SVE_SIG_ZREG_SIZE(vq) * (n)))
 #define ZA_SIG_CONTEXT_SIZE(vq) (ZA_SIG_REGS_OFFSET + ZA_SIG_REGS_SIZE(vq))
 #define ZT_SIG_REG_SIZE 512
 #define ZT_SIG_REG_BYTES (ZT_SIG_REG_SIZE / 8)
 #define ZT_SIG_REGS_OFFSET sizeof(struct zt_context)
-#define ZT_SIG_REGS_SIZE(n) (ZT_SIG_REG_BYTES * n)
+#define ZT_SIG_REGS_SIZE(n) (ZT_SIG_REG_BYTES * (n))
 #define ZT_SIG_CONTEXT_SIZE(n) (sizeof(struct zt_context) + ZT_SIG_REGS_SIZE(n))
 #endif