diff --git a/arch/arm64/include/uapi/asm/sigcontext.h b/arch/arm64/include/uapi/asm/sigcontext.h
index f23c1dc3f002..7b66d245f2d2 100644
--- a/arch/arm64/include/uapi/asm/sigcontext.h
+++ b/arch/arm64/include/uapi/asm/sigcontext.h
@@ -168,6 +168,15 @@ 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>
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index b5dff91274fb..7ff775495f3e 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -88,6 +88,7 @@ struct rt_sigframe_user_layout {
 
 	unsigned long fpsimd_offset;
 	unsigned long esr_offset;
+	unsigned long gcs_offset;
 	unsigned long sve_offset;
 	unsigned long tpidr2_offset;
 	unsigned long za_offset;
@@ -214,6 +215,8 @@ struct user_ctxs {
 	u32 za_size;
 	struct zt_context __user *zt;
 	u32 zt_size;
+	struct gcs_context __user *gcs;
+	u32 gcs_size;
 };
 
 static int preserve_fpsimd_context(struct fpsimd_context __user *ctx)
@@ -606,6 +609,82 @@ extern int restore_zt_context(struct user_ctxs *user);
 
 #endif /* ! CONFIG_ARM64_SME */
 
+#ifdef CONFIG_ARM64_GCS
+
+static int preserve_gcs_context(struct gcs_context __user *ctx)
+{
+	int err = 0;
+	u64 gcspr;
+
+	/*
+	 * We will add a cap token to the frame, include it in the
+	 * GCSPR_EL0 we report to support stack switching via
+	 * sigreturn.
+	 */
+	gcs_preserve_current_state();
+	gcspr = current->thread.gcspr_el0;
+	if (task_gcs_el0_enabled(current))
+		gcspr -= 8;
+
+	__put_user_error(GCS_MAGIC, &ctx->head.magic, err);
+	__put_user_error(sizeof(*ctx), &ctx->head.size, err);
+	__put_user_error(gcspr, &ctx->gcspr, err);
+	__put_user_error(current->thread.gcs_el0_mode,
+			 &ctx->features_enabled, err);
+
+	return err;
+}
+
+static int restore_gcs_context(struct user_ctxs *user)
+{
+	u64 gcspr, enabled;
+	int err = 0;
+
+	if (user->gcs_size != sizeof(*user->gcs))
+		return -EINVAL;
+
+	__get_user_error(gcspr, &user->gcs->gcspr, err);
+	__get_user_error(enabled, &user->gcs->features_enabled, err);
+	if (err)
+		return err;
+
+	/* Don't allow unknown modes */
+	if (enabled & ~PR_SHADOW_STACK_SUPPORTED_STATUS_MASK)
+		return -EINVAL;
+
+	err = gcs_check_locked(current, enabled);
+	if (err != 0)
+		return err;
+
+	/* Don't allow enabling */
+	if (!task_gcs_el0_enabled(current) &&
+	    (enabled & PR_SHADOW_STACK_ENABLE))
+		return -EINVAL;
+
+	/* If we are disabling disable everything */
+	if (!(enabled & PR_SHADOW_STACK_ENABLE))
+		enabled = 0;
+
+	current->thread.gcs_el0_mode = enabled;
+
+	/*
+	 * We let userspace set GCSPR_EL0 to anything here, we will
+	 * validate later in gcs_restore_signal().
+	 */
+	current->thread.gcspr_el0 = gcspr;
+	write_sysreg_s(current->thread.gcspr_el0, SYS_GCSPR_EL0);
+
+	return 0;
+}
+
+#else /* ! CONFIG_ARM64_GCS */
+
+/* Turn any non-optimised out attempts to use these into a link error: */
+extern int preserve_gcs_context(void __user *ctx);
+extern int restore_gcs_context(struct user_ctxs *user);
+
+#endif /* ! CONFIG_ARM64_GCS */
+
 static int parse_user_sigframe(struct user_ctxs *user,
 			       struct rt_sigframe __user *sf)
 {
@@ -622,6 +701,7 @@ static int parse_user_sigframe(struct user_ctxs *user,
 	user->tpidr2 = NULL;
 	user->za = NULL;
 	user->zt = NULL;
+	user->gcs = NULL;
 
 	if (!IS_ALIGNED((unsigned long)base, 16))
 		goto invalid;
@@ -716,6 +796,17 @@ static int parse_user_sigframe(struct user_ctxs *user,
 			user->zt_size = size;
 			break;
 
+		case GCS_MAGIC:
+			if (!system_supports_gcs())
+				goto invalid;
+
+			if (user->gcs)
+				goto invalid;
+
+			user->gcs = (struct gcs_context __user *)head;
+			user->gcs_size = size;
+			break;
+
 		case EXTRA_MAGIC:
 			if (have_extra_context)
 				goto invalid;
@@ -835,6 +926,9 @@ static int restore_sigframe(struct pt_regs *regs,
 			err = restore_fpsimd_context(&user);
 	}
 
+	if (err == 0 && system_supports_gcs() && user.gcs)
+		err = restore_gcs_context(&user);
+
 	if (err == 0 && system_supports_tpidr2() && user.tpidr2)
 		err = restore_tpidr2_context(&user);
 
@@ -949,6 +1043,13 @@ static int setup_sigframe_layout(struct rt_sigframe_user_layout *user,
 			return err;
 	}
 
+	if (system_supports_gcs()) {
+		err = sigframe_alloc(user, &user->gcs_offset,
+				     sizeof(struct gcs_context));
+		if (err)
+			return err;
+	}
+
 	if (system_supports_sve() || system_supports_sme()) {
 		unsigned int vq = 0;
 
@@ -1042,6 +1143,12 @@ static int setup_sigframe(struct rt_sigframe_user_layout *user,
 		__put_user_error(current->thread.fault_code, &esr_ctx->esr, err);
 	}
 
+	if (system_supports_gcs() && err == 0 && user->gcs_offset) {
+		struct gcs_context __user *gcs_ctx =
+			apply_user_offset(user, user->gcs_offset);
+		err |= preserve_gcs_context(gcs_ctx);
+	}
+
 	/* Scalable Vector Extension state (including streaming), if present */
 	if ((system_supports_sve() || system_supports_sme()) &&
 	    err == 0 && user->sve_offset) {
