qemu_v8.mk: -march=armv8.3-a for TF-A PAUTH=y

When building TF-A with pointer authentication enabled (PAUTH=y or
SPMC_AT_EL=2), the compiler will need features from Arm Architecture
version 8.3 for some instructions. The TF-A port for the QEMU platform
by default uses Arm Arch 8.0 so with pointer authentication we need to
specify a higher version to avoid errors like:
  CC      common/backtrace/backtrace.c
/tmp/cc6mqzev.s: Assembler messages:
/tmp/cc6mqzev.s:57: Error: selected processor does not support `xpaci x0'

These errors are currently limited to configurations with TF_A_DEBUG=1
but to keep it simple, always select armv8.3-a if pointer authentication
is needed.

Signed-off-by: Jens Wiklander <[email protected]>
Reviewed-by: Jerome Forissier <[email protected]>
Tested-by: Jerome Forissier <[email protected]> (vexpress-qemu_armv8a)

qemu_v8.mk

@@ -210,6 +210,7 @@ TF_A_FLAGS_SPMC_AT_EL_2 += QEMU_TOS_FW_CONFIG_DTS=../build/qemu_v8/spmc_el2_mani
 TF_A_FLAGS_SPMC_AT_EL_2 += QEMU_TB_FW_CONFIG_DTS=../build/qemu_v8/tb_fw_config.dts
 ifneq ($(PAUTH),y)
 TF_A_FLAGS_SPMC_AT_EL_2 += BRANCH_PROTECTION=1
+TF_A_FLAGS_SPMC_AT_EL_2 += ARM_ARCH_MAJOR=8 ARM_ARCH_MINOR=3
 endif
 ifneq ($(MEMTAG),y)
 TF_A_FLAGS_SPMC_AT_EL_2 += ENABLE_FEAT_MTE2=2
@@ -231,6 +232,7 @@ endif
 
 ifeq ($(PAUTH),y)
 TF_A_FLAGS += BRANCH_PROTECTION=1
+TF_A_FLAGS += ARM_ARCH_MAJOR=8 ARM_ARCH_MINOR=3
 endif
 ifeq ($(MEMTAG),y)
 TF_A_FLAGS += ENABLE_FEAT_MTE2=2