diff --git a/include/common/ep_info.h b/include/common/ep_info.h
index 2998150..4bfa1fa 100644
--- a/include/common/ep_info.h
+++ b/include/common/ep_info.h
@@ -41,7 +41,7 @@
 		__builtin_offsetof(entry_point_info_t, pc), \
 		assert_BL31_pc_offset_mismatch);
 
-#ifdef AARCH32
+#ifndef __aarch64__
 CASSERT(ENTRY_POINT_INFO_LR_SVC_OFFSET ==
 		__builtin_offsetof(entry_point_info_t, lr_svc),
 		assert_entrypoint_lr_offset_error);
diff --git a/include/common/runtime_svc.h b/include/common/runtime_svc.h
index 3b0a224..472a32a 100644
--- a/include/common/runtime_svc.h
+++ b/include/common/runtime_svc.h
@@ -20,15 +20,15 @@
  * Constants to allow the assembler access a runtime service
  * descriptor
  */
-#ifdef AARCH32
-#define RT_SVC_SIZE_LOG2	U(4)
-#define RT_SVC_DESC_INIT	U(8)
-#define RT_SVC_DESC_HANDLE	U(12)
-#else
+#ifdef __aarch64__
 #define RT_SVC_SIZE_LOG2	U(5)
 #define RT_SVC_DESC_INIT	U(16)
 #define RT_SVC_DESC_HANDLE	U(24)
-#endif /* AARCH32 */
+#else
+#define RT_SVC_SIZE_LOG2	U(4)
+#define RT_SVC_DESC_INIT	U(8)
+#define RT_SVC_DESC_HANDLE	U(12)
+#endif /* __aarch64__ */
 #define SIZEOF_RT_SVC_DESC	(U(1) << RT_SVC_SIZE_LOG2)
 
 
diff --git a/include/lib/el3_runtime/context_mgmt.h b/include/lib/el3_runtime/context_mgmt.h
index f23f9cd..7c996d1 100644
--- a/include/lib/el3_runtime/context_mgmt.h
+++ b/include/lib/el3_runtime/context_mgmt.h
@@ -35,7 +35,7 @@
 void cm_setup_context(cpu_context_t *ctx, const entry_point_info_t *ep);
 void cm_prepare_el3_exit(uint32_t security_state);
 
-#ifndef AARCH32
+#ifdef __aarch64__
 void cm_el1_sysregs_context_save(uint32_t security_state);
 void cm_el1_sysregs_context_restore(uint32_t security_state);
 void cm_set_elr_el3(uint32_t security_state, uintptr_t entrypoint);
@@ -78,6 +78,6 @@
 #else
 void *cm_get_next_context(void);
 void cm_set_next_context(void *context);
-#endif /* AARCH32 */
+#endif /* __aarch64__ */
 
 #endif /* CONTEXT_MGMT_H */
diff --git a/include/lib/el3_runtime/cpu_data.h b/include/lib/el3_runtime/cpu_data.h
index 66c47ab..55db4cf 100644
--- a/include/lib/el3_runtime/cpu_data.h
+++ b/include/lib/el3_runtime/cpu_data.h
@@ -11,15 +11,7 @@
 
 #include <bl31/ehf.h>
 
-#ifdef AARCH32
-
-#if CRASH_REPORTING
-#error "Crash reporting is not supported in AArch32"
-#endif
-#define CPU_DATA_CPU_OPS_PTR		0x0
-#define CPU_DATA_CRASH_BUF_OFFSET	0x4
-
-#else /* AARCH32 */
+#ifdef __aarch64__
 
 /* Offsets for the cpu_data structure */
 #define CPU_DATA_CRASH_BUF_OFFSET	0x18
@@ -27,9 +19,17 @@
 #define CPU_DATA_CRASH_BUF_SIZE		64
 #define CPU_DATA_CPU_OPS_PTR		0x10
 
-#endif /* AARCH32 */
+#else /* __aarch64__ */
 
 #if CRASH_REPORTING
+#error "Crash reporting is not supported in AArch32"
+#endif
+#define CPU_DATA_CPU_OPS_PTR		0x0
+#define CPU_DATA_CRASH_BUF_OFFSET	0x4
+
+#endif /* __aarch64__ */
+
+#if CRASH_REPORTING
 #define CPU_DATA_CRASH_BUF_END		(CPU_DATA_CRASH_BUF_OFFSET + \
 						CPU_DATA_CRASH_BUF_SIZE)
 #else
@@ -84,7 +84,7 @@
  * used for this.
  ******************************************************************************/
 typedef struct cpu_data {
-#ifndef AARCH32
+#ifdef __aarch64__
 	void *cpu_context[2];
 #endif
 	uintptr_t cpu_ops_ptr;
@@ -127,7 +127,7 @@
 
 struct cpu_data *_cpu_data_by_index(uint32_t cpu_index);
 
-#ifndef AARCH32
+#ifdef __aarch64__
 /* Return the cpu_data structure for the current CPU. */
 static inline struct cpu_data *_cpu_data(void)
 {
diff --git a/include/lib/el3_runtime/pubsub_events.h b/include/lib/el3_runtime/pubsub_events.h
index 8e4a87a..5012082 100644
--- a/include/lib/el3_runtime/pubsub_events.h
+++ b/include/lib/el3_runtime/pubsub_events.h
@@ -24,7 +24,7 @@
 REGISTER_PUBSUB_EVENT(psci_suspend_pwrdown_start);
 REGISTER_PUBSUB_EVENT(psci_suspend_pwrdown_finish);
 
-#ifdef AARCH64
+#ifdef __aarch64__
 /*
  * These events are published by the AArch64 context management framework
  * after the secure context is restored/saved via
@@ -40,4 +40,4 @@
  */
 REGISTER_PUBSUB_EVENT(cm_entering_normal_world);
 REGISTER_PUBSUB_EVENT(cm_exited_normal_world);
-#endif /* AARCH64 */
+#endif /* __aarch64__ */
diff --git a/include/lib/utils_def.h b/include/lib/utils_def.h
index 7098bac..35ae33a 100644
--- a/include/lib/utils_def.h
+++ b/include/lib/utils_def.h
@@ -21,10 +21,10 @@
 #define BIT_32(nr)			(U(1) << (nr))
 #define BIT_64(nr)			(ULL(1) << (nr))
 
-#ifdef AARCH32
-#define BIT				BIT_32
-#else
+#ifdef __aarch64__
 #define BIT				BIT_64
+#else
+#define BIT				BIT_32
 #endif
 
 /*
@@ -46,10 +46,10 @@
 	(((~UINT64_C(0)) << (l)) & (~UINT64_C(0) >> (64 - 1 - (h))))
 #endif
 
-#ifdef AARCH32
-#define GENMASK				GENMASK_32
-#else
+#ifdef __aarch64__
 #define GENMASK				GENMASK_64
+#else
+#define GENMASK				GENMASK_32
 #endif
 
 /*
@@ -109,10 +109,10 @@
 	((_u32) > (UINT32_MAX - (_inc)))
 
 /* Register size of the current architecture. */
-#ifdef AARCH32
-#define REGSZ		U(4)
-#else
+#ifdef __aarch64__
 #define REGSZ		U(8)
+#else
+#define REGSZ		U(4)
 #endif
 
 /*
diff --git a/include/lib/xlat_tables/xlat_mmu_helpers.h b/include/lib/xlat_tables/xlat_mmu_helpers.h
index efe0dd5..abdf1b6 100644
--- a/include/lib/xlat_tables/xlat_mmu_helpers.h
+++ b/include/lib/xlat_tables/xlat_mmu_helpers.h
@@ -65,14 +65,7 @@
 		   const uint64_t *base_table, unsigned long long max_pa,
 		   uintptr_t max_va, int xlat_regime);
 
-#ifdef AARCH32
-/* AArch32 specific translation table API */
-void enable_mmu_svc_mon(unsigned int flags);
-void enable_mmu_hyp(unsigned int flags);
-
-void enable_mmu_direct_svc_mon(unsigned int flags);
-void enable_mmu_direct_hyp(unsigned int flags);
-#else
+#ifdef __aarch64__
 /* AArch64 specific translation table APIs */
 void enable_mmu_el1(unsigned int flags);
 void enable_mmu_el2(unsigned int flags);
@@ -81,7 +74,14 @@
 void enable_mmu_direct_el1(unsigned int flags);
 void enable_mmu_direct_el2(unsigned int flags);
 void enable_mmu_direct_el3(unsigned int flags);
-#endif /* AARCH32 */
+#else
+/* AArch32 specific translation table API */
+void enable_mmu_svc_mon(unsigned int flags);
+void enable_mmu_hyp(unsigned int flags);
+
+void enable_mmu_direct_svc_mon(unsigned int flags);
+void enable_mmu_direct_hyp(unsigned int flags);
+#endif /* __aarch64__ */
 
 bool xlat_arch_is_granule_size_supported(size_t size);
 size_t xlat_arch_get_max_supported_granule_size(void);
diff --git a/include/lib/xlat_tables/xlat_tables_arch.h b/include/lib/xlat_tables/xlat_tables_arch.h
index 7237534..0ce0cac 100644
--- a/include/lib/xlat_tables/xlat_tables_arch.h
+++ b/include/lib/xlat_tables/xlat_tables_arch.h
@@ -7,10 +7,10 @@
 #ifndef XLAT_TABLES_ARCH_H
 #define XLAT_TABLES_ARCH_H
 
-#ifdef AARCH32
-#include "aarch32/xlat_tables_aarch32.h"
-#else
+#ifdef __aarch64__
 #include "aarch64/xlat_tables_aarch64.h"
+#else
+#include "aarch32/xlat_tables_aarch32.h"
 #endif
 
 /*
diff --git a/include/lib/xlat_tables/xlat_tables_defs.h b/include/lib/xlat_tables/xlat_tables_defs.h
index 000811f..76cfc0b 100644
--- a/include/lib/xlat_tables/xlat_tables_defs.h
+++ b/include/lib/xlat_tables/xlat_tables_defs.h
@@ -62,7 +62,7 @@
 #define OSH			(U(0x2) << 6)
 #define ISH			(U(0x3) << 6)
 
-#ifdef AARCH64
+#ifdef __aarch64__
 /* Guarded Page bit */
 #define GP			(ULL(1) << 50)
 #endif
diff --git a/include/plat/arm/common/arm_def.h b/include/plat/arm/common/arm_def.h
index ead1a8b..53bd13f 100644
--- a/include/plat/arm/common/arm_def.h
+++ b/include/plat/arm/common/arm_def.h
@@ -434,7 +434,7 @@
 #endif
 #endif
 
-#if defined(AARCH32) || JUNO_AARCH32_EL3_RUNTIME
+#if !defined(__aarch64__) || JUNO_AARCH32_EL3_RUNTIME
 /*******************************************************************************
  * BL32 specific defines for EL3 runtime in AArch32 mode
  ******************************************************************************/
@@ -498,17 +498,17 @@
 # else
 #  error "Unsupported ARM_TSP_RAM_LOCATION_ID value"
 # endif
-#endif /* AARCH32 || JUNO_AARCH32_EL3_RUNTIME */
+#endif /* !__aarch64__ || JUNO_AARCH32_EL3_RUNTIME */
 
 /*
  * BL32 is mandatory in AArch32. In AArch64, undefine BL32_BASE if there is no
  * SPD and no SPM, as they are the only ones that can be used as BL32.
  */
-#if !(defined(AARCH32) || JUNO_AARCH32_EL3_RUNTIME)
+#if defined(__aarch64__) && !JUNO_AARCH32_EL3_RUNTIME
 # if defined(SPD_none) && !ENABLE_SPM
 #  undef BL32_BASE
 # endif /* defined(SPD_none) && !ENABLE_SPM */
-#endif /* !(defined(AARCH32) || JUNO_AARCH32_EL3_RUNTIME) */
+#endif /* defined(__aarch64__) && !JUNO_AARCH32_EL3_RUNTIME */
 
 /*******************************************************************************
  * FWU Images: NS_BL1U, BL2U & NS_BL2U defines.
diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index c8260e8..07a46c5 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -69,7 +69,7 @@
 
 void arm_setup_romlib(void);
 
-#if defined(IMAGE_BL31) || (defined(AARCH32) && defined(IMAGE_BL32))
+#if defined(IMAGE_BL31) || (!defined(__aarch64__) && defined(IMAGE_BL32))
 /*
  * Use this macro to instantiate lock before it is used in below
  * arm_lock_xxx() macros
@@ -102,7 +102,7 @@
 #define arm_lock_get()
 #define arm_lock_release()
 
-#endif /* defined(IMAGE_BL31) || (defined(AARCH32) && defined(IMAGE_BL32)) */
+#endif /* defined(IMAGE_BL31) || (!defined(__aarch64__) && defined(IMAGE_BL32)) */
 
 #if ARM_RECOM_STATE_ID_ENC
 /*
diff --git a/include/plat/common/common_def.h b/include/plat/common/common_def.h
index 66c88ba..14ae603 100644
--- a/include/plat/common/common_def.h
+++ b/include/plat/common/common_def.h
@@ -20,13 +20,13 @@
 /*
  * Platform binary types for linking
  */
-#ifdef AARCH32
-#define PLATFORM_LINKER_FORMAT          "elf32-littlearm"
-#define PLATFORM_LINKER_ARCH            arm
-#else
+#ifdef __aarch64__
 #define PLATFORM_LINKER_FORMAT          "elf64-littleaarch64"
 #define PLATFORM_LINKER_ARCH            aarch64
-#endif /* AARCH32 */
+#else
+#define PLATFORM_LINKER_FORMAT          "elf32-littlearm"
+#define PLATFORM_LINKER_ARCH            arm
+#endif /* __aarch64__ */
 
 /*
  * Generic platform constants