fix(trp): preserve RMI SMC X4 when not used as return
This patch adds X2-X6 and 'smc_ret' parameters to trp_rmi_handler().
The last 'smc_ret' parameter passed in X7 contains address of
'trp_smc_result' structure on stack to return result of RMI SMC call.
This allows to preserve X4 if not used as a return argument as per
SMCCCv1.2. The patch also removes use of trp_args_t in RMI handling.
Signed-off-by: AlexeiFedorov <Alexei.Fedorov@arm.com>
Change-Id: I9e3387a7380b37863eeccc53d13e92e0ac5cffbd
diff --git a/include/services/trp/trp_helpers.h b/include/services/trp/trp_helpers.h
index 8e786e2..83ec740 100644
--- a/include/services/trp/trp_helpers.h
+++ b/include/services/trp/trp_helpers.h
@@ -39,5 +39,12 @@
__dead2 void trp_boot_abort(uint64_t err);
+/* TRP SMC result registers X0-X4 */
+#define TRP_SMC_RESULT_REGS 5
+
+struct trp_smc_result {
+ unsigned long long x[TRP_SMC_RESULT_REGS];
+};
+
#endif /* __ASSEMBLER __ */
#endif /* TRP_HELPERS_H */