3 files changed, 23 insertions, 1 deletions
diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h
index 055381b2c615..48d46b768eae 100644
--- a/arch/arm64/include/uapi/asm/hwcap.h
+++ b/arch/arm64/include/uapi/asm/hwcap.h
@@ -21,7 +21,7 @@
  * HWCAP flags - for AT_HWCAP
  *
  * Bits 62 and 63 are reserved for use by libc.
- * Bits 32-61 are unallocated for potential use by libc.
+ * Bits 33-61 are unallocated for potential use by libc.
  */
 #define HWCAP_FP		(1 << 0)
 #define HWCAP_ASIMD		(1 << 1)
@@ -55,6 +55,7 @@
 #define HWCAP_SB		(1 << 29)
 #define HWCAP_PACA		(1 << 30)
 #define HWCAP_PACG		(1UL << 31)
+#define HWCAP_GCS		(1UL << 32)
 
 /*
  * HWCAP2 flags - for AT_HWCAP2
@@ -124,4 +125,8 @@
 #define HWCAP2_SME_SF8DP2	(1UL << 62)
 #define HWCAP2_POE		(1UL << 63)
 
+/*
+ * HWCAP3 flags - for AT_HWCAP3
+ */
+
 #endif /* _UAPI__ASM_HWCAP_H */
diff --git a/arch/arm64/include/uapi/asm/ptrace.h b/arch/arm64/include/uapi/asm/ptrace.h
index 7fa2f7036aa7..0f39ba4f3efd 100644
--- a/arch/arm64/include/uapi/asm/ptrace.h
+++ b/arch/arm64/include/uapi/asm/ptrace.h
@@ -324,6 +324,14 @@ struct user_za_header {
 #define ZA_PT_SIZE(vq)						\
 	(ZA_PT_ZA_OFFSET + ZA_PT_ZA_SIZE(vq))
 
+/* GCS state (NT_ARM_GCS) */
+
+struct user_gcs {
+	__u64 features_enabled;
+	__u64 features_locked;
+	__u64 gcspr_el0;
+};
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _UAPI__ASM_PTRACE_H */
diff --git a/arch/arm64/include/uapi/asm/sigcontext.h b/arch/arm64/include/uapi/asm/sigcontext.h
index bb7af77a30a7..d42f7a92238b 100644
--- a/arch/arm64/include/uapi/asm/sigcontext.h
+++ b/arch/arm64/include/uapi/asm/sigcontext.h
@@ -183,6 +183,15 @@ struct zt_context {
 	__u16 __reserved[3];
 };
 
+#define GCS_MAGIC	0x47435300
+
+struct gcs_context {
+	struct _aarch64_ctx head;
+	__u64 gcspr;
+	__u64 features_enabled;
+	__u64 reserved;
+};
+
 #endif /* !__ASSEMBLY__ */
 
 #include <asm/sve_context.h>