diff --git a/Makefile b/Makefile
index aca57b697680e126d3a14606f203e599c4b83bde..beb02377672af60f1750747ce5b82855146f3286 100644
--- a/Makefile
+++ b/Makefile
@@ -273,8 +273,7 @@ endif
 CPPFLAGS		=	${DEFINES} ${INCLUDES} ${MBEDTLS_INC} -nostdinc		\
 				-Wmissing-include-dirs $(ERRORS) $(WARNINGS)
 ASFLAGS			+=	$(CPPFLAGS) $(ASFLAGS_$(ARCH))			\
-				-D__ASSEMBLY__ -ffreestanding 			\
-				-Wa,--fatal-warnings
+				-ffreestanding -Wa,--fatal-warnings
 TF_CFLAGS		+=	$(CPPFLAGS) $(TF_CFLAGS_$(ARCH))		\
 				-ffreestanding -fno-builtin -Wall -std=gnu99	\
 				-Os -ffunction-sections -fdata-sections
@@ -763,14 +762,16 @@ all: msg_start
 msg_start:
 	@echo "Building ${PLAT}"
 
-# Check if deprecated declarations and cpp warnings should be treated as error or not.
 ifeq (${ERROR_DEPRECATED},0)
+# Check if deprecated declarations and cpp warnings should be treated as error or not.
 ifneq ($(findstring clang,$(notdir $(CC))),)
     CPPFLAGS		+= 	-Wno-error=deprecated-declarations
 else
     CPPFLAGS		+= 	-Wno-error=deprecated-declarations -Wno-error=cpp
 endif
-endif
+# __ASSEMBLY__ is deprecated in favor of the compiler-builtin __ASSEMBLER__.
+ASFLAGS	+= -D__ASSEMBLY__
+endif # !ERROR_DEPRECATED
 
 $(eval $(call MAKE_LIB_DIRS))
 $(eval $(call MAKE_LIB,c))
diff --git a/bl32/tsp/tsp_private.h b/bl32/tsp/tsp_private.h
index e39f29166cf036e2ed5af516ec2c85d01f2b0adc..cbd527f37e888c850cd5182b1b7decd04ca98985 100644
--- a/bl32/tsp/tsp_private.h
+++ b/bl32/tsp/tsp_private.h
@@ -20,7 +20,7 @@
 #define TSP_ARGS_END		0x40
 
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -148,6 +148,6 @@ tsp_args_t *tsp_system_off_main(uint64_t arg0,
 				uint64_t arg7);
 
 uint64_t tsp_main(void);
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* TSP_PRIVATE_H */
diff --git a/drivers/arm/css/sds/sds_private.h b/drivers/arm/css/sds/sds_private.h
index 2101dd049e1889c31fabc01ea2f771204a929055..d801a04ddd23e90fa031cd552dcf771e5a605439 100644
--- a/drivers/arm/css/sds/sds_private.h
+++ b/drivers/arm/css/sds/sds_private.h
@@ -58,7 +58,7 @@
 #define SDS_REGION_REGIONSIZE_OFFSET		0x4
 #define SDS_REGION_DESC_SIZE			0x8
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stddef.h>
 #include <stdint.h>
 
@@ -95,6 +95,6 @@ typedef struct region_descriptor {
 	& SDS_REGION_SCH_VERSION_MASK)
 #define GET_SDS_REGION_SIZE(region)		((((region_desc_t *)(region))->reg[1]))
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* SDS_PRIVATE_H */
diff --git a/drivers/imx/uart/imx_uart.h b/drivers/imx/uart/imx_uart.h
index b71504c7f7609e9de7d22fd74bccdbc9db20fb03..4f6d3de2e581d3e813613fc6446a6bb53a93ee11 100644
--- a/drivers/imx/uart/imx_uart.h
+++ b/drivers/imx/uart/imx_uart.h
@@ -152,7 +152,7 @@
 #define IMX_UART_TS_RXFULL	BIT(3)
 #define IMX_UART_TS_SOFTRST	BIT(0)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 typedef struct {
 	console_t console;
@@ -163,6 +163,6 @@ int console_imx_uart_register(uintptr_t baseaddr,
 			      uint32_t clock,
 			      uint32_t baud,
 			      console_imx_uart_t *console);
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* IMX_UART_H */
diff --git a/drivers/renesas/rcar/delay/micro_delay.h b/drivers/renesas/rcar/delay/micro_delay.h
index 193daba631469a8cbc89e81a36d3d49a8ad543f4..37b71f80a68ae667f3c0b1c2e0e49e3285048da0 100644
--- a/drivers/renesas/rcar/delay/micro_delay.h
+++ b/drivers/renesas/rcar/delay/micro_delay.h
@@ -7,7 +7,7 @@
 #ifndef MICRO_DELAY_H
 #define MICRO_DELAY_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stdint.h>
 void rcar_micro_delay(uint64_t micro_sec);
 #endif
diff --git a/drivers/renesas/rcar/pwrc/pwrc.c b/drivers/renesas/rcar/pwrc/pwrc.c
index f4c9d3abcb70132d15814a5864101c8f9d39c4b6..32e04a73a73cdf1bfd07c5e2803f382780a3e381 100644
--- a/drivers/renesas/rcar/pwrc/pwrc.c
+++ b/drivers/renesas/rcar/pwrc/pwrc.c
@@ -148,7 +148,7 @@ RCAR_INSTANTIATE_LOCK
 #define IS_CA57(c) 	((c) == RCAR_CLUSTER_CA57)
 #define IS_CA53(c) 	((c) == RCAR_CLUSTER_CA53)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 IMPORT_SYM(unsigned long, __system_ram_start__, SYSTEM_RAM_START);
 IMPORT_SYM(unsigned long, __system_ram_end__, SYSTEM_RAM_END);
 IMPORT_SYM(unsigned long, __SRAM_COPY_START__, SRAM_COPY_START);
diff --git a/drivers/renesas/rcar/pwrc/pwrc.h b/drivers/renesas/rcar/pwrc/pwrc.h
index e67c6ef2d60c97f1208d561906011b641380ce40..2b817839724dcc56c62fce3a748bf82b85b0a109 100644
--- a/drivers/renesas/rcar/pwrc/pwrc.h
+++ b/drivers/renesas/rcar/pwrc/pwrc.h
@@ -38,7 +38,7 @@
 #define	RCAR_CLUSTER_CA53	(1U)
 #define	RCAR_CLUSTER_CA57	(2U)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 void rcar_pwrc_disable_interrupt_wakeup(uint64_t mpidr);
 void rcar_pwrc_enable_interrupt_wakeup(uint64_t mpidr);
 void rcar_pwrc_clusteroff(uint64_t mpidr);
diff --git a/include/arch/aarch32/smccc_helpers.h b/include/arch/aarch32/smccc_helpers.h
index d3e5e59c5327b6e3b716369d7200651fb980f81d..b2ee3cfe0496a0016603c547fb7736795cea04a7 100644
--- a/include/arch/aarch32/smccc_helpers.h
+++ b/include/arch/aarch32/smccc_helpers.h
@@ -24,7 +24,7 @@
 #define SMC_CTX_PMCR		U(0x88)
 #define SMC_CTX_SIZE		U(0x90)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -156,6 +156,6 @@ void smc_set_next_ctx(unsigned int security_state);
 /* Get the pointer to next `smc_ctx_t` already set by `smc_set_next_ctx()`. */
 void *smc_get_next_ctx(void);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* SMCCC_HELPERS_H */
diff --git a/include/arch/aarch64/smccc_helpers.h b/include/arch/aarch64/smccc_helpers.h
index e28697d7ef0885a6b891f1f2549bb5e4a56ae7fe..fac6fd9cf9f236bc99cee62133d197747c97cc68 100644
--- a/include/arch/aarch64/smccc_helpers.h
+++ b/include/arch/aarch64/smccc_helpers.h
@@ -9,7 +9,7 @@
 
 #include <lib/smccc.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdbool.h>
 
@@ -82,6 +82,6 @@
 		_x4 = read_ctx_reg(regs, CTX_GPREG_X4);		\
 	} while (false)
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* SMCCC_HELPERS_H */
diff --git a/include/bl1/bl1.h b/include/bl1/bl1.h
index 937b8c7e8c12e0bde4b3bb991e22e9b5acc60500..d81f434045088be859fe292e2a6bae385ce49ce6 100644
--- a/include/bl1/bl1.h
+++ b/include/bl1/bl1.h
@@ -61,7 +61,7 @@
 #define is_fwu_fid(_fid) \
     ((_fid >= FWU_SMC_FID_START) && (_fid <= FWU_SMC_FID_END))
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <lib/cassert.h>
 
@@ -98,5 +98,5 @@ CASSERT(FWU_NUM_SMC_CALLS == 	\
 void bl1_calc_bl2_mem_layout(const meminfo_t *bl1_mem_layout,
 			meminfo_t *bl2_mem_layout);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* BL1_H */
diff --git a/include/bl31/ehf.h b/include/bl31/ehf.h
index ee00d09361b7a35fcc4f557b74bb4b78243cf343..c13d28c357b957c77c941183bfbb430618511fd8 100644
--- a/include/bl31/ehf.h
+++ b/include/bl31/ehf.h
@@ -7,7 +7,7 @@
 #ifndef EHF_H
 #define EHF_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <cdefs.h>
 #include <stdint.h>
@@ -87,6 +87,6 @@ void ehf_register_priority_handler(unsigned int pri, ehf_handler_t handler);
 void ehf_allow_ns_preemption(uint64_t preempt_ret_code);
 unsigned int ehf_is_ns_preemption_allowed(void);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* EHF_H */
diff --git a/include/bl31/interrupt_mgmt.h b/include/bl31/interrupt_mgmt.h
index b1683cc11cd8bd80ce16ea492a992050fdcbe86b..8bb1bab248afe41908e54a3ede8dafcf521f99e1 100644
--- a/include/bl31/interrupt_mgmt.h
+++ b/include/bl31/interrupt_mgmt.h
@@ -79,7 +79,7 @@
 #define get_interrupt_src_ss(flag)	(((flag) >> INTR_SRC_SS_FLAG_SHIFT) & \
 					 INTR_SRC_SS_FLAG_MASK)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <errno.h>
 #include <stdint.h>
@@ -143,5 +143,5 @@ interrupt_type_handler_t get_interrupt_type_handler(uint32_t type);
 int disable_intr_rm_local(uint32_t type, uint32_t security_state);
 int enable_intr_rm_local(uint32_t type, uint32_t security_state);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 #endif /* INTERRUPT_MGMT_H */
diff --git a/include/bl32/tsp/tsp.h b/include/bl32/tsp/tsp.h
index 18d3079e2200c7242fb153bbc45254b4dc13d0d5..637e14abf798cf8745c798bf43e9ed89b744f528 100644
--- a/include/bl32/tsp/tsp.h
+++ b/include/bl32/tsp/tsp.h
@@ -84,7 +84,7 @@
 #define TOS_CALL_VERSION	0xbf00ff03 /* Trusted OS Call Version */
 
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -106,6 +106,6 @@ typedef struct tsp_vectors {
 
 void tsp_setup(void);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* TSP_H */
diff --git a/include/common/bl_common.h b/include/common/bl_common.h
index eb96df0b11f55bcc1286d41b7df0fb73d9f506a2..896a03f0a3c4b82955aeda4662a19e8e69599339 100644
--- a/include/common/bl_common.h
+++ b/include/common/bl_common.h
@@ -11,11 +11,11 @@
 #include <common/param_header.h>
 #include <lib/utils_def.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stddef.h>
 #include <stdint.h>
 #include <lib/cassert.h>
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #include <export/common/bl_common_exp.h>
 
@@ -91,7 +91,7 @@
 #define __TEXT_END__			Load$$__TEXT_EPILOGUE__$$Base
 #endif /* USE_ARM_LINK */
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 /*
  * Declarations of linker defined symbols to help determine memory layout of
@@ -178,6 +178,6 @@ void setup_page_tables(const struct mmap_region *bl_regions,
 
 void bl_handle_pauth(void);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* BL_COMMON_H */
diff --git a/include/common/debug.h b/include/common/debug.h
index f8faf6835fd6d31a6560fa4a6521534aebfabbd8..245e698654447b68d3a5e2559b3c4fc0b5837c6b 100644
--- a/include/common/debug.h
+++ b/include/common/debug.h
@@ -27,7 +27,7 @@
 #define LOG_LEVEL_INFO			U(40)
 #define LOG_LEVEL_VERBOSE		U(50)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <cdefs.h>
 #include <stdarg.h>
@@ -110,5 +110,5 @@ void __dead2 __stack_chk_fail(void);
 void tf_log(const char *fmt, ...) __printflike(1, 2);
 void tf_log_set_max_level(unsigned int log_level);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* DEBUG_H */
diff --git a/include/common/ep_info.h b/include/common/ep_info.h
index 6cb903ef695bcaca5a90c737b45700dd5a515f89..29981509bf80f50c2c0e21b64194b67dd86edc69 100644
--- a/include/common/ep_info.h
+++ b/include/common/ep_info.h
@@ -9,10 +9,10 @@
 
 #include <common/param_header.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stdint.h>
 #include <lib/cassert.h>
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #include <export/common/ep_info_exp.h>
 
@@ -30,7 +30,7 @@
 #define SET_SECURITY_STATE(x, security) \
 			((x) = ((x) & ~EP_SECURITY_MASK) | (security))
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 /*
  * Compile time assertions related to the 'entry_point_info' structure to
@@ -56,6 +56,6 @@ CASSERT(sizeof(uintptr_t) ==
 		__builtin_offsetof(entry_point_info_t, pc), \
 		assert_entrypoint_and_spsr_should_be_adjacent);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* EP_INFO_H */
diff --git a/include/common/interrupt_props.h b/include/common/interrupt_props.h
index 6c6a85361e42fca89db95cf8c04a9365a9e07cb7..07bafaae546eab4547ce97653aca36c39b58cafa 100644
--- a/include/common/interrupt_props.h
+++ b/include/common/interrupt_props.h
@@ -7,7 +7,7 @@
 #ifndef INTERRUPT_PROPS_H
 #define INTERRUPT_PROPS_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 /* Create an interrupt property descriptor from various interrupt properties */
 #define INTR_PROP_DESC(num, pri, grp, cfg) \
@@ -25,5 +25,5 @@ typedef struct interrupt_prop {
 	unsigned int intr_cfg:2;
 } interrupt_prop_t;
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* INTERRUPT_PROPS_H */
diff --git a/include/common/param_header.h b/include/common/param_header.h
index b8852869ad6e474f8b4c74006dca7f0ac37ec6a1..4dab4e3c4756c528000014e589bae8ee085c764b 100644
--- a/include/common/param_header.h
+++ b/include/common/param_header.h
@@ -9,9 +9,9 @@
 
 #include <stdbool.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stdint.h>
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #include <export/common/param_header_exp.h>
 
diff --git a/include/common/runtime_svc.h b/include/common/runtime_svc.h
index e5e36c71ef4e8b2669016fcd7af612b8597fe594..3b0a22484e44ebccc62ee089f09191768a624a19 100644
--- a/include/common/runtime_svc.h
+++ b/include/common/runtime_svc.h
@@ -39,7 +39,7 @@
  */
 #define MAX_RT_SVCS		U(128)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 /* Prototype for runtime service initializing function */
 typedef int32_t (*rt_svc_init_t)(void);
@@ -134,5 +134,5 @@ void init_crash_reporting(void);
 
 extern uint8_t rt_svc_descs_indices[MAX_RT_SVCS];
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 #endif /* RUNTIME_SVC_H */
diff --git a/include/drivers/arm/cci.h b/include/drivers/arm/cci.h
index c5ddcfd448b731da41a3b6eed6f01ac7ccc2ed47..5aea95a0c0845370eafed79021464a2821b4472f 100644
--- a/include/drivers/arm/cci.h
+++ b/include/drivers/arm/cci.h
@@ -100,7 +100,7 @@
 
 #define SLAVE_IF_UNUSED			-1
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -121,5 +121,5 @@ void cci_init(uintptr_t base, const int *map, unsigned int num_cci_masters);
 void cci_enable_snoop_dvm_reqs(unsigned int master_id);
 void cci_disable_snoop_dvm_reqs(unsigned int master_id);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* CCI_H */
diff --git a/include/drivers/arm/ccn.h b/include/drivers/arm/ccn.h
index 9c3abac6b17f58af898c276486129b82f9e74605..7f737681ef07790b538bceff53dd9f3cbba53e69 100644
--- a/include/drivers/arm/ccn.h
+++ b/include/drivers/arm/ccn.h
@@ -46,7 +46,7 @@
  */
 #define CCN_GET_RUN_STATE(pstate)	(pstate & 0xf)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stdint.h>
 
 /*
@@ -109,5 +109,5 @@ unsigned long long ccn_read_node_reg(node_types_t node_type,
 					unsigned int node_id,
 					unsigned int reg_offset);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* CCN_H */
diff --git a/include/drivers/arm/css/sds.h b/include/drivers/arm/css/sds.h
index 114ae9258f4f4bd912118e5ce81edcf07e085952..db4cbaaf56ed5862217f72bcf0c0bc73746118da 100644
--- a/include/drivers/arm/css/sds.h
+++ b/include/drivers/arm/css/sds.h
@@ -70,7 +70,7 @@
 #define SDS_ERR_STRUCT_NOT_FOUND	-3
 #define SDS_ERR_STRUCT_NOT_FINALIZED	-4
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stddef.h>
 #include <stdint.h>
 
@@ -85,6 +85,6 @@ int sds_struct_read(uint32_t structure_id, unsigned int fld_off, void *data,
 		size_t size, sds_access_mode_t mode);
 int sds_struct_write(uint32_t structure_id, unsigned int fld_off, void *data,
 		size_t size, sds_access_mode_t mode);
-#endif /*__ASSEMBLY__ */
+#endif /*__ASSEMBLER__ */
 
 #endif /* SDS_H */
diff --git a/include/drivers/arm/fvp/fvp_pwrc.h b/include/drivers/arm/fvp/fvp_pwrc.h
index ca173f36f88037f61fac927555045e53e7756918..39e2516201f99e1bcbbdffd9aa5a5c252c7cd9c7 100644
--- a/include/drivers/arm/fvp/fvp_pwrc.h
+++ b/include/drivers/arm/fvp/fvp_pwrc.h
@@ -35,7 +35,7 @@
 
 #define PSYSR_INVALID		U(0xffffffff)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -50,6 +50,6 @@ void fvp_pwrc_clr_wen(u_register_t mpidr);
 unsigned int fvp_pwrc_read_psysr(u_register_t mpidr);
 unsigned int fvp_pwrc_get_cpu_wkr(u_register_t mpidr);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* FVP_PWRC_H */
diff --git a/include/drivers/arm/gicv2.h b/include/drivers/arm/gicv2.h
index 6bc5101d13f7007e1fab7d54fc1baf0e95466e1c..ebcb216d6b3e62ba68d67f0e18717f7f70242d0f 100644
--- a/include/drivers/arm/gicv2.h
+++ b/include/drivers/arm/gicv2.h
@@ -116,7 +116,7 @@
 /* Interrupt ID mask for HPPIR, AHPPIR, IAR and AIAR CPU Interface registers */
 #define INT_ID_MASK		U(0x3ff)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <cdefs.h>
 #include <stdint.h>
@@ -184,5 +184,5 @@ void gicv2_clear_interrupt_pending(unsigned int id);
 unsigned int gicv2_set_pmr(unsigned int mask);
 void gicv2_interrupt_set_cfg(unsigned int id, unsigned int cfg);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* GICV2_H */
diff --git a/include/drivers/arm/gicv3.h b/include/drivers/arm/gicv3.h
index 72221acb0fc96d9dd51dbd6922abf91498fdc249..9c72d4dff311fc5d2c0a1793ef693ceaeca6d6f7 100644
--- a/include/drivers/arm/gicv3.h
+++ b/include/drivers/arm/gicv3.h
@@ -208,7 +208,7 @@
 #define GITS_CTLR_QUIESCENT_SHIFT	31
 #define GITS_CTLR_QUIESCENT_BIT		BIT_32(GITS_CTLR_QUIESCENT_SHIFT)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdbool.h>
 #include <stdint.h>
@@ -406,5 +406,5 @@ void gicv3_set_interrupt_pending(unsigned int id, unsigned int proc_num);
 void gicv3_clear_interrupt_pending(unsigned int id, unsigned int proc_num);
 unsigned int gicv3_set_pmr(unsigned int mask);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* GICV3_H */
diff --git a/include/drivers/arm/pl011.h b/include/drivers/arm/pl011.h
index f201f0048fb5a5c6025cf20dc0007f7f84d28aee..8733d196408cab47bb4981d8b706463419f4afa3 100644
--- a/include/drivers/arm/pl011.h
+++ b/include/drivers/arm/pl011.h
@@ -83,7 +83,7 @@
 
 #define CONSOLE_T_PL011_BASE	CONSOLE_T_DRVDATA
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -101,6 +101,6 @@ typedef struct {
 int console_pl011_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			   console_pl011_t *console);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* PL011_H */
diff --git a/include/drivers/arm/sp805.h b/include/drivers/arm/sp805.h
index 551bfe4bae90abfcc99ba60c645339667572d7e8..b00ede1d6db67f7bcf9265ea691d17b06246b3ec 100644
--- a/include/drivers/arm/sp805.h
+++ b/include/drivers/arm/sp805.h
@@ -21,7 +21,7 @@
 #define SP805_CTR_RESEN			(U(1) << 1)
 #define SP805_CTR_INTEN			(U(1) << 0)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -31,6 +31,6 @@ void sp805_start(uintptr_t base, unsigned int ticks);
 void sp805_stop(uintptr_t base);
 void sp805_refresh(uintptr_t base, unsigned int ticks);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* SP805_H */
diff --git a/include/drivers/arm/tzc400.h b/include/drivers/arm/tzc400.h
index 98ef0ec1e0e13f01bec6a81b4575dbd447318b82..32aeb03502cf93d69e2e1f778238c2e66b9dea6f 100644
--- a/include/drivers/arm/tzc400.h
+++ b/include/drivers/arm/tzc400.h
@@ -93,7 +93,7 @@
 #define TZC_400_REGION_SIZE			U(0x20)
 #define TZC_400_ACTION_OFF			U(0x4)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <cdefs.h>
 #include <stdint.h>
@@ -154,6 +154,6 @@ static inline void tzc_disable_filters(void)
 	tzc400_disable_filters();
 }
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* TZC400_H */
diff --git a/include/drivers/arm/tzc_dmc500.h b/include/drivers/arm/tzc_dmc500.h
index 24bfaeb145571e5fc49377c406e51f28697e3e6a..cce074cb9b312b58847ca42baec21d1aa62ea62e 100644
--- a/include/drivers/arm/tzc_dmc500.h
+++ b/include/drivers/arm/tzc_dmc500.h
@@ -121,7 +121,7 @@
 /* Length of registers for configuring each region */
 #define TZC_DMC500_REGION_SIZE				U(0x018)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -147,5 +147,5 @@ void tzc_dmc500_config_complete(void);
 int tzc_dmc500_verify_complete(void);
 
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* TZC_DMC500_H */
diff --git a/include/drivers/auth/mbedtls/mbedtls_config.h b/include/drivers/auth/mbedtls/mbedtls_config.h
index d143d7351f7d93332d717aa1fbf33a1f03bf93cf..acfde268a2e54ad42f83fe4a343b35c4484fff62 100644
--- a/include/drivers/auth/mbedtls/mbedtls_config.h
+++ b/include/drivers/auth/mbedtls/mbedtls_config.h
@@ -86,7 +86,7 @@
 /* Memory buffer allocator options */
 #define MBEDTLS_MEMORY_ALIGN_MULTIPLE        8
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 /* System headers required to build mbed TLS with the current configuration */
 #include <stdlib.h>
 #include "mbedtls/check_config.h"
diff --git a/include/drivers/cadence/cdns_uart.h b/include/drivers/cadence/cdns_uart.h
index 0a1cf77819355fd0222d4c4406937c382aea56cb..64a062ca148da47b83385794a3456b19632580f5 100644
--- a/include/drivers/cadence/cdns_uart.h
+++ b/include/drivers/cadence/cdns_uart.h
@@ -27,7 +27,7 @@
 
 #define CONSOLE_T_CDNS_BASE	CONSOLE_T_DRVDATA
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -45,6 +45,6 @@ typedef struct {
 int console_cdns_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			  console_cdns_t *console);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* CDNS_UART_H */
diff --git a/include/drivers/console.h b/include/drivers/console.h
index f31de95493d802f13c7e5176b1af58a0f30b06b3..cada771b43127a0b0b835a3903c68a9cf290858d 100644
--- a/include/drivers/console.h
+++ b/include/drivers/console.h
@@ -28,7 +28,7 @@
 /* Returned by console_xxx() if no registered console implements xxx. */
 #define ERROR_NO_VALID_CONSOLE		(-128)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -75,6 +75,6 @@ int console_getc(void);
 /* Flush all consoles registered for the current state. */
 int console_flush(void);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* CONSOLE_H */
diff --git a/include/drivers/marvell/cache_llc.h b/include/drivers/marvell/cache_llc.h
index 1aa4c889ee14b135257df34b4103b377da15ad23..85babb8d4b2767efb3986746e308f8c7cf2263bd 100644
--- a/include/drivers/marvell/cache_llc.h
+++ b/include/drivers/marvell/cache_llc.h
@@ -27,7 +27,7 @@
 #define LLC_EXCLUSIVE_EN		0x100
 #define LLC_WAY_MASK			0xFFFFFFFF
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 void llc_cache_sync(int ap_index);
 void llc_flush_all(int ap_index);
 void llc_clean_all(int ap_index);
diff --git a/include/drivers/marvell/ccu.h b/include/drivers/marvell/ccu.h
index 546d9f13bce3f055ca5a38092cdca31808dd11c7..b0d1ec98403f025e97b82279e71a8a32098152fd 100644
--- a/include/drivers/marvell/ccu.h
+++ b/include/drivers/marvell/ccu.h
@@ -10,7 +10,7 @@
 #ifndef CCU_H
 #define CCU_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <drivers/marvell/addr_map.h>
 #endif
 
@@ -36,7 +36,7 @@
 
 #define CCU_SRAM_WIN_CR				CCU_WIN_CR_OFFSET(MVEBU_AP0, 1)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 int init_ccu(int);
 void ccu_win_check(struct addr_map_win *win);
 void ccu_enable_win(int ap_index, struct addr_map_win *win, uint32_t win_id);
diff --git a/include/drivers/marvell/uart/a3700_console.h b/include/drivers/marvell/uart/a3700_console.h
index 5511d96c44dbfc299b825f5803c57862d1bc3a71..517f01a8f9f176f6fdcfef40d3460c443a2b2af2 100644
--- a/include/drivers/marvell/uart/a3700_console.h
+++ b/include/drivers/marvell/uart/a3700_console.h
@@ -56,7 +56,7 @@
 
 #define CONSOLE_T_A3700_BASE	CONSOLE_T_DRVDATA
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -74,6 +74,6 @@ typedef struct {
 int console_a3700_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			   console_a3700_t *console);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif	/* A3700_CONSOLE_H */
diff --git a/include/drivers/meson/meson_console.h b/include/drivers/meson/meson_console.h
index 5da1e3fd457d94df818c8bb115d08d1799709e10..70e3b0bd4e16bec1ea783b69eff77d6299031573 100644
--- a/include/drivers/meson/meson_console.h
+++ b/include/drivers/meson/meson_console.h
@@ -11,7 +11,7 @@
 
 #define CONSOLE_T_MESON_BASE	CONSOLE_T_DRVDATA
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -32,6 +32,6 @@ typedef struct {
 int console_meson_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			   console_meson_t *console);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* MESON_CONSOLE_H */
diff --git a/include/drivers/renesas/rcar/console/console.h b/include/drivers/renesas/rcar/console/console.h
index 5bc10b7b17b6e29866ada036cab096ad1399c05a..0e4ed8f356761826875729645f953a8846507046 100644
--- a/include/drivers/renesas/rcar/console/console.h
+++ b/include/drivers/renesas/rcar/console/console.h
@@ -9,7 +9,7 @@
 
 #define CONSOLE_T_RCAR_BASE	CONSOLE_T_DRVDATA
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -27,6 +27,6 @@ typedef struct {
 int console_rcar_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			  console_rcar_t *console);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* RCAR_PRINTF_H */
diff --git a/include/drivers/st/stm32_console.h b/include/drivers/st/stm32_console.h
index b30376828f09e57063368d559a6cf39cba37a794..a2ad87cb5f01dd65e53261409d9171d7aced2dba 100644
--- a/include/drivers/st/stm32_console.h
+++ b/include/drivers/st/stm32_console.h
@@ -11,7 +11,7 @@
 
 #define CONSOLE_T_STM32_BASE	CONSOLE_T_DRVDATA
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -29,6 +29,6 @@ struct console_stm32 {
 int console_stm32_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			   struct console_stm32 *console);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* STM32_CONSOLE_H */
diff --git a/include/drivers/st/stm32_gpio.h b/include/drivers/st/stm32_gpio.h
index 4320eafcdaf07c8458a00c3928fb5c8fe3f9aaad..e241f584f72a60420af3cf1d6d928c23939bf88a 100644
--- a/include/drivers/st/stm32_gpio.h
+++ b/include/drivers/st/stm32_gpio.h
@@ -45,13 +45,13 @@
 #define GPIO_PULL_DOWN		0x02
 #define GPIO_PULL_MASK		U(0x03)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stdint.h>
 
 int dt_set_pinctrl_config(int node);
 void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t speed,
 	      uint32_t pull, uint32_t alternate, uint8_t status);
 void set_gpio_secure_cfg(uint32_t bank, uint32_t pin, bool secure);
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* STM32_GPIO_H */
diff --git a/include/drivers/ti/uart/uart_16550.h b/include/drivers/ti/uart/uart_16550.h
index 92b1ea8c3a29fcd5255f133566187e6b6ab0de19..32e38f0ac1ef5e462892db41666e19a75c32edb6 100644
--- a/include/drivers/ti/uart/uart_16550.h
+++ b/include/drivers/ti/uart/uart_16550.h
@@ -73,7 +73,7 @@
 
 #define CONSOLE_T_16550_BASE	CONSOLE_T_DRVDATA
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -91,6 +91,6 @@ typedef struct {
 int console_16550_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			   console_16550_t *console);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* UART_16550_H */
diff --git a/include/lib/bakery_lock.h b/include/lib/bakery_lock.h
index a2f540c6274e5858aaed485a7863c0d058932bca..1fece01afd1b36bda9f206a4fe25510293aca5ac 100644
--- a/include/lib/bakery_lock.h
+++ b/include/lib/bakery_lock.h
@@ -11,7 +11,7 @@
 
 #define BAKERY_LOCK_MAX_CPUS		PLATFORM_CORE_COUNT
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <cdefs.h>
 #include <stdbool.h>
 #include <stdint.h>
@@ -101,5 +101,5 @@ void bakery_lock_release(bakery_lock_t *bakery);
 #define DECLARE_BAKERY_LOCK(_name) extern bakery_lock_t _name
 
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* BAKERY_LOCK_H */
diff --git a/include/lib/cpus/aarch32/cortex_a9.h b/include/lib/cpus/aarch32/cortex_a9.h
index 1fb0a923c1c6662ebe4fd142d172c89b986557b8..a8c978a8b3078e6171ce43e7b99240cddef0aba2 100644
--- a/include/lib/cpus/aarch32/cortex_a9.h
+++ b/include/lib/cpus/aarch32/cortex_a9.h
@@ -25,7 +25,7 @@
  ******************************************************************************/
 #define PCR		p15, 0, c15, c0, 0
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <arch_helpers.h>
 DEFINE_COPROCR_RW_FUNCS(pcr, PCR)
 #endif
diff --git a/include/lib/cpus/aarch64/cortex_a75.h b/include/lib/cpus/aarch64/cortex_a75.h
index 204bfdd469196403bce1da1fe578f4e738dd59c9..e5ca1ba313645020b34dd6964681bcb2d2af9ea4 100644
--- a/include/lib/cpus/aarch64/cortex_a75.h
+++ b/include/lib/cpus/aarch64/cortex_a75.h
@@ -41,7 +41,7 @@
 #define CORTEX_A75_AMU_GROUP0_MASK	U(0x7)
 #define CORTEX_A75_AMU_GROUP1_MASK	(U(0) << 3)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stdint.h>
 
 uint64_t cortex_a75_amu_cnt_read(int idx);
@@ -50,6 +50,6 @@ unsigned int cortex_a75_amu_read_cpuamcntenset_el0(void);
 unsigned int cortex_a75_amu_read_cpuamcntenclr_el0(void);
 void cortex_a75_amu_write_cpuamcntenset_el0(unsigned int mask);
 void cortex_a75_amu_write_cpuamcntenclr_el0(unsigned int mask);
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* CORTEX_A75_H */
diff --git a/include/lib/cpus/aarch64/cpuamu.h b/include/lib/cpus/aarch64/cpuamu.h
index 921abdbd420d5140e77000682e05a895a86bd0e3..463f890fd02b428762190107248179f238cffa73 100644
--- a/include/lib/cpus/aarch64/cpuamu.h
+++ b/include/lib/cpus/aarch64/cpuamu.h
@@ -29,7 +29,7 @@
 #define CPUAMEVTYPER3_EL0	S3_3_C15_C10_3
 #define CPUAMEVTYPER4_EL0	S3_3_C15_C10_4
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stdint.h>
 
 uint64_t cpuamu_cnt_read(unsigned int idx);
@@ -43,6 +43,6 @@ int midr_match(unsigned int cpu_midr);
 void cpuamu_context_save(unsigned int nr_counters);
 void cpuamu_context_restore(unsigned int nr_counters);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* CPUAMU_H */
diff --git a/include/lib/cpus/aarch64/denver.h b/include/lib/cpus/aarch64/denver.h
index 81c076a1a7046ee7ade9b039faa737dfafcfe104..02657a0fb14db1583ae3a6a831c5858aaf05dd2a 100644
--- a/include/lib/cpus/aarch64/denver.h
+++ b/include/lib/cpus/aarch64/denver.h
@@ -34,11 +34,11 @@
 #define DENVER_CPU_PMSTATE_C7		U(0x7)
 #define DENVER_CPU_PMSTATE_MASK		U(0xF)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 /* Disable Dynamic Code Optimisation */
 void denver_disable_dco(void);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* DENVER_H */
diff --git a/include/lib/cpus/errata_report.h b/include/lib/cpus/errata_report.h
index 17b2c30f852588055940fa9a2b4ea1530e04cf7d..7cac77ebe671ca372501ff44d97572d7acd0a1b7 100644
--- a/include/lib/cpus/errata_report.h
+++ b/include/lib/cpus/errata_report.h
@@ -7,7 +7,7 @@
 #ifndef ERRATA_REPORT_H
 #define ERRATA_REPORT_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <arch.h>
 #include <arch_helpers.h>
@@ -23,7 +23,7 @@ static inline void print_errata_status(void) {}
 void errata_print_msg(unsigned int status, const char *cpu, const char *id);
 int errata_needs_reporting(spinlock_t *lock, uint32_t *reported);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 /* Errata status */
 #define ERRATA_NOT_APPLIES	0
diff --git a/include/lib/el3_runtime/aarch32/context.h b/include/lib/el3_runtime/aarch32/context.h
index 86ff53a67344d7c52891adf7460fcdd1ad4386e4..c5567c974bc76b351877e32d660f7e126e7494c4 100644
--- a/include/lib/el3_runtime/aarch32/context.h
+++ b/include/lib/el3_runtime/aarch32/context.h
@@ -24,7 +24,7 @@
 #define CTX_NS_SCTLR		U(0x1C)
 #define CTX_REGS_END		U(0x20)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -65,6 +65,6 @@ typedef struct cpu_context {
 CASSERT(CTX_REGS_OFFSET == __builtin_offsetof(cpu_context_t, regs_ctx), \
 	assert_core_context_regs_offset_mismatch);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* CONTEXT_H */
diff --git a/include/lib/el3_runtime/aarch64/context.h b/include/lib/el3_runtime/aarch64/context.h
index 5bd0de4249e3cf2fecc73ce3098567025745658a..a76a59b78580b01924376fe0a43dd0e66137b103 100644
--- a/include/lib/el3_runtime/aarch64/context.h
+++ b/include/lib/el3_runtime/aarch64/context.h
@@ -207,7 +207,7 @@
 #define CTX_PAUTH_REGS_END	U(0)
 #endif /* CTX_INCLUDE_PAUTH_REGS */
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -384,6 +384,6 @@ void fpregs_context_save(fp_regs_t *regs);
 void fpregs_context_restore(fp_regs_t *regs);
 #endif
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* CONTEXT_H */
diff --git a/include/lib/el3_runtime/cpu_data.h b/include/lib/el3_runtime/cpu_data.h
index 9e1d7f16c79e4dd2223be150682f32afa4eb0b2b..66c47ab789fa273922e9591b166eb6fbcd25e174 100644
--- a/include/lib/el3_runtime/cpu_data.h
+++ b/include/lib/el3_runtime/cpu_data.h
@@ -49,7 +49,7 @@
 #define CPU_DATA_PMF_TS0_IDX		0
 #endif
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <arch_helpers.h>
 #include <lib/cassert.h>
@@ -161,5 +161,5 @@ void init_cpu_ops(void);
 						sizeof(((cpu_data_t *)0)->_m))
 
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* CPU_DATA_H */
diff --git a/include/lib/extensions/ras.h b/include/lib/extensions/ras.h
index 98daab601dc2cf8c48d98507af6235e09e66847e..4fc8f04b11d87e4cdd3db24101e69ce6a7e7805a 100644
--- a/include/lib/extensions/ras.h
+++ b/include/lib/extensions/ras.h
@@ -68,7 +68,7 @@
 		.num_intrs = ARRAY_SIZE(_array), \
 	}
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <assert.h>
 
@@ -196,6 +196,6 @@ int ras_ea_handler(unsigned int ea_reason, uint64_t syndrome, void *cookie,
 		void *handle, uint64_t flags);
 void ras_init(void);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* RAS_H */
diff --git a/include/lib/extensions/ras_arch.h b/include/lib/extensions/ras_arch.h
index e9375a35607e9671de4c895086c27edf4d759918..0c98c4a0ea0a2ad67bbe117a4801fb01e93a8462 100644
--- a/include/lib/extensions/ras_arch.h
+++ b/include/lib/extensions/ras_arch.h
@@ -178,7 +178,7 @@
 /* I/DFSC code for synchronous external abort */
 #define SYNC_EA_FSC		0x10
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <arch.h>
 #include <arch_helpers.h>
@@ -256,6 +256,6 @@ static inline void ser_sys_select_record(unsigned int idx)
 /* Library functions to probe Standard Error Record */
 int ser_probe_memmap(uintptr_t base, unsigned int size_num_k, int *probe_data);
 int ser_probe_sysreg(unsigned int idx_start, unsigned int num_idx, int *probe_data);
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* RAS_ARCH_H */
diff --git a/include/lib/libc/aarch64/setjmp_.h b/include/lib/libc/aarch64/setjmp_.h
index 174b3eb18062708c2d3ddd6b16521a19857d0e65..f880a17b7b87fb19881eee02b94b07b342e858bf 100644
--- a/include/lib/libc/aarch64/setjmp_.h
+++ b/include/lib/libc/aarch64/setjmp_.h
@@ -18,13 +18,13 @@
 
 #define JMP_SIZE	(JMP_CTX_END >> 3)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <cdefs.h>
 
 /* Jump buffer hosting x18 - x30 and sp_el0 registers */
 typedef uint64_t jmp_buf[JMP_SIZE] __aligned(16);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* SETJMP__H */
diff --git a/include/lib/libc/setjmp.h b/include/lib/libc/setjmp.h
index 5661201a0b1b1351b1e7b98aff3647cfc700bdd0..be8e2c01ad61b804f562602bf7cfe096fe7e1c13 100644
--- a/include/lib/libc/setjmp.h
+++ b/include/lib/libc/setjmp.h
@@ -9,12 +9,12 @@
 
 #include <setjmp_.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <cdefs.h>
 
 int setjmp(jmp_buf env);
 __dead2 void longjmp(jmp_buf env, int val);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* SETJMP_H */
diff --git a/include/lib/libfdt/fdt.h b/include/lib/libfdt/fdt.h
index 74961f9026d160650f68a5880c1a8a4d8b43c147..ef7c86b6ddbda8e4d2a5af176afd635471319e50 100644
--- a/include/lib/libfdt/fdt.h
+++ b/include/lib/libfdt/fdt.h
@@ -52,7 +52,7 @@
  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 struct fdt_header {
 	fdt32_t magic;			 /* magic word FDT_MAGIC */
@@ -90,7 +90,7 @@ struct fdt_property {
 	char data[0];
 };
 
-#endif /* !__ASSEMBLY */
+#endif /* !__ASSEMBLER__ */
 
 #define FDT_MAGIC	0xd00dfeed	/* 4: version, 4: total size */
 #define FDT_TAGSIZE	sizeof(fdt32_t)
diff --git a/include/lib/psci/psci.h b/include/lib/psci/psci.h
index fe279d4f2c510d1420ee8d4f81014e4140111de5..04e5e3d7261aa09d9fc4e3ca2252f88df5db5e1b 100644
--- a/include/lib/psci/psci.h
+++ b/include/lib/psci/psci.h
@@ -166,7 +166,7 @@
 #define PSCI_RESET2_TYPE_ARCH		(U(0) << PSCI_RESET2_TYPE_VENDOR_SHIFT)
 #define PSCI_RESET2_SYSTEM_WARM_RESET	(PSCI_RESET2_TYPE_ARCH | U(0))
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -348,6 +348,6 @@ int psci_features(unsigned int psci_fid);
 void __dead2 psci_power_down_wfi(void);
 void psci_arch_setup(void);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* PSCI_H */
diff --git a/include/lib/psci/psci_lib.h b/include/lib/psci/psci_lib.h
index 53d7711b1208fda262ddb37c7174950a4abb0c2c..76c1a8dcf48aa236b9a070500a7dbfaea64439cd 100644
--- a/include/lib/psci/psci_lib.h
+++ b/include/lib/psci/psci_lib.h
@@ -9,7 +9,7 @@
 
 #include <common/ep_info.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <cdefs.h>
 #include <stdint.h>
@@ -89,6 +89,6 @@ void psci_warmboot_entrypoint(void);
 void psci_register_spd_pm_hook(const spd_pm_ops_t *pm);
 void psci_prepare_next_non_secure_ctx(
 			  entry_point_info_t *next_image_info);
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* PSCI_LIB_H */
diff --git a/include/lib/runtime_instr.h b/include/lib/runtime_instr.h
index f5a3f1386515008b6fa132f013edd76996b7bd92..303f27e5bfccaabc1d49c643f21d22ac161ff1d2 100644
--- a/include/lib/runtime_instr.h
+++ b/include/lib/runtime_instr.h
@@ -17,9 +17,9 @@
 #define RT_INSTR_EXIT_CFLUSH		U(5)
 #define RT_INSTR_TOTAL_IDS		U(6)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 PMF_DECLARE_CAPTURE_TIMESTAMP(rt_instr_svc)
 PMF_DECLARE_GET_TIMESTAMP(rt_instr_svc)
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* RUNTIME_INSTR_H */
diff --git a/include/lib/smccc.h b/include/lib/smccc.h
index 94c39d2a6dbcfed0d61d21e5620186a1ee8411b0..76e60231f0c992428e654680953e420cd7cde982 100644
--- a/include/lib/smccc.h
+++ b/include/lib/smccc.h
@@ -87,7 +87,7 @@
 #define SMC_FROM_SECURE		(U(0) << 0)
 #define SMC_FROM_NON_SECURE	(U(1) << 0)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -155,5 +155,5 @@ static inline uint32_t smc_uuid_word(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t
 		smc_uuid_word((_uuid).node[2], (_uuid).node[3],			\
 			      (_uuid).node[4], (_uuid).node[5]))
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 #endif /* SMCCC_H */
diff --git a/include/lib/spinlock.h b/include/lib/spinlock.h
index fcd36e85617196e400bcb9d0e974f18f0662cb3a..0bf3ee066f05837cd374a3104a54a6eeaeb57ab5 100644
--- a/include/lib/spinlock.h
+++ b/include/lib/spinlock.h
@@ -7,7 +7,7 @@
 #ifndef SPINLOCK_H
 #define SPINLOCK_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
diff --git a/include/lib/utils.h b/include/lib/utils.h
index 674845404467b2e1df6823d0e07e2af483a83e00..cdb125cfa4dbbce2aceb45682dbd21ccca33db78 100644
--- a/include/lib/utils.h
+++ b/include/lib/utils.h
@@ -11,7 +11,7 @@
  * C code should be put in this part of the header to avoid breaking ASM files
  * or linker scripts including it.
  */
-#if !(defined(__LINKER__) || defined(__ASSEMBLY__))
+#if !(defined(__LINKER__) || defined(__ASSEMBLER__))
 
 #include <stddef.h>
 #include <stdint.h>
@@ -91,6 +91,6 @@ static inline u_register_t load_addr_## _name(void)		\
 /* Helper to invoke the function defined by DEFINE_LOAD_SYM_ADDR() */
 #define LOAD_ADDR_OF(_name)	(typeof(_name) *) load_addr_## _name()
 
-#endif /* !(defined(__LINKER__) || defined(__ASSEMBLY__)) */
+#endif /* !(defined(__LINKER__) || defined(__ASSEMBLER__)) */
 
 #endif /* UTILS_H */
diff --git a/include/lib/utils_def.h b/include/lib/utils_def.h
index 41f71e84ab5e9bb031367147286e7136dfb807b4..7098bace15d104f5a169012bcfa99f1cc6cd9549 100644
--- a/include/lib/utils_def.h
+++ b/include/lib/utils_def.h
@@ -32,7 +32,7 @@
  * position @h. For example
  * GENMASK_64(39, 21) gives us the 64bit vector 0x000000ffffe00000.
  */
-#if defined(__LINKER__) || defined(__ASSEMBLY__)
+#if defined(__LINKER__) || defined(__ASSEMBLER__)
 #define GENMASK_32(h, l) \
 	(((0xFFFFFFFF) << (l)) & (0xFFFFFFFF >> (32 - 1 - (h))))
 
diff --git a/include/lib/xlat_tables/xlat_mmu_helpers.h b/include/lib/xlat_tables/xlat_mmu_helpers.h
index 85effcaa50895eca3b04368fe0f08257c9e28bc7..efe0dd5e581d33600fe6cd3887595d0b0c23748d 100644
--- a/include/lib/xlat_tables/xlat_mmu_helpers.h
+++ b/include/lib/xlat_tables/xlat_mmu_helpers.h
@@ -50,7 +50,7 @@
 #define MMU_CFG_TTBR0		2
 #define MMU_CFG_PARAM_MAX	3
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdbool.h>
 #include <stdint.h>
@@ -86,6 +86,6 @@ void enable_mmu_direct_el3(unsigned int flags);
 bool xlat_arch_is_granule_size_supported(size_t size);
 size_t xlat_arch_get_max_supported_granule_size(void);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* XLAT_MMU_HELPERS_H */
diff --git a/include/lib/xlat_tables/xlat_tables.h b/include/lib/xlat_tables/xlat_tables.h
index 9e2543fbbc21ff2fcce0afef865e42187badc160..082bb5e454782a3b28e561095357b31b12078d71 100644
--- a/include/lib/xlat_tables/xlat_tables.h
+++ b/include/lib/xlat_tables/xlat_tables.h
@@ -9,7 +9,7 @@
 
 #include <lib/xlat_tables/xlat_tables_defs.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stddef.h>
 #include <stdint.h>
 
@@ -88,5 +88,5 @@ void mmap_add_region(unsigned long long base_pa, uintptr_t base_va,
 		     size_t size, unsigned int attr);
 void mmap_add(const mmap_region_t *mm);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 #endif /* XLAT_TABLES_H */
diff --git a/include/lib/xlat_tables/xlat_tables_v2.h b/include/lib/xlat_tables/xlat_tables_v2.h
index 55514268380242807903aaeebc31dc5346d63d33..0e099987e40eeaaa3028e120f4195fbfbfa33077 100644
--- a/include/lib/xlat_tables/xlat_tables_v2.h
+++ b/include/lib/xlat_tables/xlat_tables_v2.h
@@ -10,7 +10,7 @@
 #include <lib/xlat_tables/xlat_tables_defs.h>
 #include <lib/xlat_tables/xlat_tables_v2_helpers.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stddef.h>
 #include <stdint.h>
 
@@ -364,5 +364,5 @@ int xlat_get_mem_attributes_ctx(const xlat_ctx_t *ctx, uintptr_t base_va,
 				uint32_t *attr);
 int xlat_get_mem_attributes(uintptr_t base_va, uint32_t *attr);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 #endif /* XLAT_TABLES_V2_H */
diff --git a/include/lib/xlat_tables/xlat_tables_v2_helpers.h b/include/lib/xlat_tables/xlat_tables_v2_helpers.h
index 6a1be3258ce00e48002368f9527a5cf69ad78554..b17b71a872004aae44aedd27d0a91daa0ec551e6 100644
--- a/include/lib/xlat_tables/xlat_tables_v2_helpers.h
+++ b/include/lib/xlat_tables/xlat_tables_v2_helpers.h
@@ -16,7 +16,7 @@
 #error "Do not include this header file directly. Include xlat_tables_v2.h instead."
 #endif
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdbool.h>
 #include <stddef.h>
@@ -160,6 +160,6 @@ struct xlat_ctx {
 		.initialized = false,					\
 	}
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* XLAT_TABLES_V2_HELPERS_H */
diff --git a/include/plat/arm/board/common/board_css_def.h b/include/plat/arm/board/common/board_css_def.h
index f982b57b48bcf816309f339361612c2bb8b748ba..4637b6785a26c884d6f54ef6c09d479c8d605db4 100644
--- a/include/plat/arm/board/common/board_css_def.h
+++ b/include/plat/arm/board/common/board_css_def.h
@@ -29,7 +29,7 @@
 #define BOARD_CSS_PLAT_TYPE_EMULATOR		0x02
 #define BOARD_CSS_PLAT_TYPE_FVP			0x03
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <lib/mmio.h>
 
@@ -37,7 +37,7 @@
 	((mmio_read_32(addr) & BOARD_CSS_PLAT_ID_REG_ID_MASK)		\
 	>> BOARD_CSS_PLAT_ID_REG_ID_SHIFT)
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 
 #define MAX_IO_DEVICES			3
diff --git a/include/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h
index ec28db0750d3833c6311ad047fd0b7df1aa1dc1c..2adf11d66e6c6144c37eebd62486d7a2a7c4ee94 100644
--- a/include/plat/arm/css/common/css_def.h
+++ b/include/plat/arm/css/common/css_def.h
@@ -136,7 +136,7 @@
 #define SPIDEN_INT_CLR_SHIFT	6
 #define SPIDEN_SEL_SET_SHIFT	7
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 /* SSC_VERSION related accessors */
 
@@ -150,7 +150,7 @@
 		(((val) >> SSC_VERSION_CONFIG_SHIFT) &		\
 		SSC_VERSION_CONFIG_MASK)
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 /*************************************************************************
  * Required platform porting definitions common to all
diff --git a/include/services/spm_svc.h b/include/services/spm_svc.h
index 57912e883488bb73c94e7a3a03d047d17aabec65..a3723a0f50e6a840d266b21282475ee1e4733619 100644
--- a/include/services/spm_svc.h
+++ b/include/services/spm_svc.h
@@ -63,7 +63,7 @@
 
 #endif /* SPM_MM */
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -85,6 +85,6 @@ uint64_t spm_sp_call(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3);
 
 #endif /* SPM_MM */
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* SPM_SVC_H */
diff --git a/lib/romlib/Makefile b/lib/romlib/Makefile
index 60c14580878d0d730d3199fe2cc946e58a6c51da..cec94043dd23accd2d47c00656d70486c1581345 100644
--- a/lib/romlib/Makefile
+++ b/lib/romlib/Makefile
@@ -15,7 +15,7 @@ LIB_DIR     = ../../$(BUILD_PLAT)/lib
 WRAPPER_DIR = ../../$(BUILD_PLAT)/libwrapper
 LIBS        = -lmbedtls -lfdt -lc
 INC         = $(INCLUDES:-I%=-I../../%)
-PPFLAGS     = $(INC) $(DEFINES) -P -D__ASSEMBLY__ -D__LINKER__ -MD -MP -MT $(BUILD_DIR)/romlib.ld
+PPFLAGS     = $(INC) $(DEFINES) -P -x assembler-with-cpp -D__LINKER__ -MD -MP -MT $(BUILD_DIR)/romlib.ld
 OBJS        = $(BUILD_DIR)/jmptbl.o $(BUILD_DIR)/init.o
 MAPFILE     = ../../$(BUILD_PLAT)/romlib/romlib.map
 
diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk
index 2d41b2db17ac640914a38f5c8e33e717c95f6935..4a9677b0d85c424079eb5298b42895b8a3cad1dc 100644
--- a/make_helpers/build_macros.mk
+++ b/make_helpers/build_macros.mk
@@ -273,7 +273,7 @@ $(eval IMAGE := IMAGE_BL$(call uppercase,$(3)))
 
 $(1): $(2) $(filter-out %.d,$(MAKEFILE_LIST)) | bl$(3)_dirs
 	$$(ECHO) "  PP      $$<"
-	$$(Q)$$(CPP) $$(CPPFLAGS) -P -D__ASSEMBLY__ -D__LINKER__ $(MAKE_DEP) -D$(IMAGE) -o $$@ $$<
+	$$(Q)$$(CPP) $$(CPPFLAGS) -P -x assembler-with-cpp -D__LINKER__ $(MAKE_DEP) -D$(IMAGE) -o $$@ $$<
 
 -include $(DEP)
 
diff --git a/plat/arm/css/sgi/include/sgi_base_platform_def.h b/plat/arm/css/sgi/include/sgi_base_platform_def.h
index 032a1f473f82f0aaa1ff4b3ae68ce31e2c900a1a..a9cc852789e5e132767d8a93046cbfd14a2c9414 100644
--- a/plat/arm/css/sgi/include/sgi_base_platform_def.h
+++ b/plat/arm/css/sgi/include/sgi_base_platform_def.h
@@ -187,7 +187,7 @@
 
 /* Platform ID address */
 #define SSC_VERSION                     (SSC_REG_BASE + SSC_VERSION_OFFSET)
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 /* SSC_VERSION related accessors */
 /* Returns the part number of the platform */
 #define GET_SGI_PART_NUM                                       \
@@ -195,7 +195,7 @@
 /* Returns the configuration number of the platform */
 #define GET_SGI_CONFIG_NUM                                     \
 		GET_SSC_VERSION_CONFIG(mmio_read_32(SSC_VERSION))
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 /*******************************************************************************
  * Memprotect definitions
diff --git a/plat/arm/css/sgm/include/sgm_base_platform_def.h b/plat/arm/css/sgm/include/sgm_base_platform_def.h
index 4ecfc969a729a56c34c3b7659abdbca865e0e763..f349c196ddcde2953f133ceef4e2f234b20b8464 100644
--- a/plat/arm/css/sgm/include/sgm_base_platform_def.h
+++ b/plat/arm/css/sgm/include/sgm_base_platform_def.h
@@ -51,7 +51,7 @@
 
 /* Platform ID address */
 #define SSC_VERSION                     (SSC_REG_BASE + SSC_VERSION_OFFSET)
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 /* SSC_VERSION related accessors */
 /* Returns the part number of the platform */
 #define GET_PLAT_PART_NUM                                       \
@@ -59,7 +59,7 @@
 /* Returns the configuration number of the platform */
 #define GET_PLAT_CONFIG_NUM                                     \
 		GET_SSC_VERSION_CONFIG(mmio_read_32(SSC_VERSION))
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 
 /*************************************************************************
diff --git a/plat/hisilicon/hikey/include/hisi_pwrc.h b/plat/hisilicon/hikey/include/hisi_pwrc.h
index f1cc297dd427750f6c3ecc40c4a871bd5465558a..cbb465134e2ecf8051be98c11f28c0a3af74e3a8 100644
--- a/plat/hisilicon/hikey/include/hisi_pwrc.h
+++ b/plat/hisilicon/hikey/include/hisi_pwrc.h
@@ -7,7 +7,7 @@
 #ifndef HISI_PWRC_H
 #define HISI_PWRC_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 void hisi_pwrc_set_cluster_wfi(unsigned int id);
 void hisi_pwrc_set_core_bx_addr(unsigned int core,
@@ -17,6 +17,6 @@ void hisi_pwrc_enable_debug(unsigned int core,
 			    unsigned int cluster);
 int hisi_pwrc_setup(void);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* HISI_PWRC_H */
diff --git a/plat/imx/common/include/imx8_lpuart.h b/plat/imx/common/include/imx8_lpuart.h
index 63449e7def607c6f18f53728fe25a54af078d0e9..0ea284fdf15cf5cf03b2f9348debd45434ae85a7 100644
--- a/plat/imx/common/include/imx8_lpuart.h
+++ b/plat/imx/common/include/imx8_lpuart.h
@@ -50,7 +50,7 @@
 #define LPUART_BAUD_BOTHEDGE_MASK                (0x20000U)
 #define LPUART_BAUD_M10_MASK                     (0x20000000U)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -61,6 +61,6 @@ typedef struct {
 
 int console_lpuart_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			   console_lpuart_t *console);
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* IMX8_LPUART_H */
diff --git a/plat/imx/common/include/imx_uart.h b/plat/imx/common/include/imx_uart.h
index 1b52e2f0b8878223c875573d9e2840d8a0fe511d..cc1b5318ea6ed104013ef8ee4b8845b2525a105f 100644
--- a/plat/imx/common/include/imx_uart.h
+++ b/plat/imx/common/include/imx_uart.h
@@ -9,7 +9,7 @@
 
 #include <drivers/console.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 typedef struct {
 	console_t console;
@@ -18,6 +18,6 @@ typedef struct {
 
 int console_imx_uart_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			   console_uart_t *console);
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif  /* IMX_UART_H */
diff --git a/plat/layerscape/common/include/ls_16550.h b/plat/layerscape/common/include/ls_16550.h
index b0b1856f03dc9f50cdb7d070971b4955bf73bb0f..cb4514f3f4816dddc3d6c5f616613a22eadae645 100644
--- a/plat/layerscape/common/include/ls_16550.h
+++ b/plat/layerscape/common/include/ls_16550.h
@@ -63,7 +63,7 @@
 
 #define CONSOLE_T_16550_BASE	CONSOLE_T_DRVDATA
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -81,6 +81,6 @@ typedef struct {
 int console_ls_16550_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			   console_ls_16550_t *console);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* LS_16550_H */
diff --git a/plat/marvell/a3700/common/include/platform_def.h b/plat/marvell/a3700/common/include/platform_def.h
index 16865c4d23e0037795c823738b3131e5c81c95dd..591f045857cefdab5e0fb9f1dce0ce233763a6f8 100644
--- a/plat/marvell/a3700/common/include/platform_def.h
+++ b/plat/marvell/a3700/common/include/platform_def.h
@@ -8,9 +8,9 @@
 #ifndef PLATFORM_DEF_H
 #define PLATFORM_DEF_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stdio.h>
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #include <board_marvell_def.h>
 #include <mvebu_def.h>
diff --git a/plat/marvell/a8k/common/include/platform_def.h b/plat/marvell/a8k/common/include/platform_def.h
index 3f6154e75e090a5d39a2467e0562ea851e26ee78..b9c2e0ed7a5cd0b9e82f5c89975a1aed75f25d3a 100644
--- a/plat/marvell/a8k/common/include/platform_def.h
+++ b/plat/marvell/a8k/common/include/platform_def.h
@@ -8,9 +8,9 @@
 #ifndef PLATFORM_DEF_H
 #define PLATFORM_DEF_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stdio.h>
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #include <common/interrupt_props.h>
 #include <drivers/arm/gic_common.h>
diff --git a/plat/mediatek/mt8183/drivers/mcsi/mcsi.h b/plat/mediatek/mt8183/drivers/mcsi/mcsi.h
index 8a588bfb3e6035a9af0d0cfb7e629b4e7c675479..863e7dab10232d768c259b71d3fd1071a8a2d80c 100644
--- a/plat/mediatek/mt8183/drivers/mcsi/mcsi.h
+++ b/plat/mediatek/mt8183/drivers/mcsi/mcsi.h
@@ -85,7 +85,7 @@
 
 #define CCI_CLK_CTRL			(MCUCFG_BASE + 0x660)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <plat/common/common_def.h>
 #include <stdint.h>
@@ -112,5 +112,5 @@ void cci_secure_switch(unsigned int ns);
 void cci_init_sf(void);
 unsigned long cci_reg_access(unsigned int op, unsigned long offset, unsigned long val);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* MCSI_H */
diff --git a/plat/nvidia/tegra/include/drivers/memctrl_v2.h b/plat/nvidia/tegra/include/drivers/memctrl_v2.h
index 9cbadd3e6592e8617b8fde232a23cbf292b4b19b..a4085e2472f37beb2522ecde41fcd5310771fef0 100644
--- a/plat/nvidia/tegra/include/drivers/memctrl_v2.h
+++ b/plat/nvidia/tegra/include/drivers/memctrl_v2.h
@@ -9,7 +9,7 @@
 
 #include <tegra_def.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <lib/mmio.h>
 #include <stdint.h>
@@ -173,6 +173,6 @@ tegra_mc_settings_t *tegra_get_mc_settings(void);
  ******************************************************************************/
 void plat_memctrl_tzdram_setup(uint64_t phys_base, uint64_t size_in_bytes);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* MEMCTRL_V2_H */
diff --git a/plat/nvidia/tegra/include/tegra_platform.h b/plat/nvidia/tegra/include/tegra_platform.h
index b9c378240e0279d1bd955580f57ce5d65f2dc989..d83ce48b8d4e60c8b98155f215f49b93ef07eb8a 100644
--- a/plat/nvidia/tegra/include/tegra_platform.h
+++ b/plat/nvidia/tegra/include/tegra_platform.h
@@ -30,7 +30,7 @@
 #define TEGRA_CHIPID_TEGRA21		U(0x21)
 #define TEGRA_CHIPID_TEGRA18		U(0x18)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 /*
  * Tegra chip ID major/minor identifiers
@@ -57,6 +57,6 @@ bool tegra_platform_is_fpga(void);
 bool tegra_platform_is_unit_fpga(void);
 bool tegra_platform_is_virt_dev_kit(void);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* TEGRA_PLATFORM_H */
diff --git a/plat/renesas/rcar/include/platform_def.h b/plat/renesas/rcar/include/platform_def.h
index bbe4a5481cc9e47ab0d6becd93194c229bc7f59d..b7f0ca113e581d99586c606106698f87c97bd06a 100644
--- a/plat/renesas/rcar/include/platform_def.h
+++ b/plat/renesas/rcar/include/platform_def.h
@@ -7,7 +7,7 @@
 #ifndef PLATFORM_DEF_H
 #define PLATFORM_DEF_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stdlib.h>
 #endif
 
diff --git a/plat/rockchip/common/include/plat_private.h b/plat/rockchip/common/include/plat_private.h
index 66b61850db4eab23e34def2dc0e9f1588b53336d..9041bdb3e5ee20103161ca9e06af4a0ae8d3d1a2 100644
--- a/plat/rockchip/common/include/plat_private.h
+++ b/plat/rockchip/common/include/plat_private.h
@@ -7,7 +7,7 @@
 #ifndef PLAT_PRIVATE_H
 #define PLAT_PRIVATE_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -140,7 +140,7 @@ extern const mmap_region_t plat_rk_mmap[];
 
 uint32_t rockchip_get_uart_base(void);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 /******************************************************************************
  * cpu up status
diff --git a/plat/rockchip/common/pmusram/cpus_on_fixed_addr.h b/plat/rockchip/common/pmusram/cpus_on_fixed_addr.h
index b22ddc29cd6756d39adfa7f741253cf6f7584bb3..34af29a8ab9c687200924e5703feda161283b403 100644
--- a/plat/rockchip/common/pmusram/cpus_on_fixed_addr.h
+++ b/plat/rockchip/common/pmusram/cpus_on_fixed_addr.h
@@ -26,7 +26,7 @@
 #define PM_WARM_BOOT_SHT	0
 #define PM_WARM_BOOT_BIT	(1 << PM_WARM_BOOT_SHT)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 struct psram_data_t {
 	uint64_t sp;
@@ -50,6 +50,6 @@ CASSERT(__builtin_offsetof(struct psram_data_t, boot_mpidr) == PSRAM_DT_MPIDR,
 
 extern void *sys_sleep_flag_sram;
 
-#endif  /* __ASSEMBLY__ */
+#endif  /* __ASSEMBLER__ */
 
 #endif
diff --git a/plat/st/stm32mp1/stm32mp1_def.h b/plat/st/stm32mp1/stm32mp1_def.h
index 94c4c5b38a1c4507459c8b569119174ed6deeb16..37941aa74b556fc27d2fedf932af224aca5acc2e 100644
--- a/plat/st/stm32mp1/stm32mp1_def.h
+++ b/plat/st/stm32mp1/stm32mp1_def.h
@@ -14,7 +14,7 @@
 #include <lib/utils_def.h>
 #include <lib/xlat_tables/xlat_tables_defs.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <drivers/st/stm32mp1_clk.h>
 
 #include <boot_api.h>
@@ -40,7 +40,7 @@
 #endif
 
 /* DDR power initializations */
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 enum ddr_type {
 	STM32MP_DDR3,
 	STM32MP_LPDDR2,
@@ -254,7 +254,7 @@ enum ddr_type {
 #define TAMP_BASE			U(0x5C00A000)
 #define TAMP_BKP_REGISTER_BASE		(TAMP_BASE + U(0x100))
 
-#if !(defined(__LINKER__) || defined(__ASSEMBLY__))
+#if !(defined(__LINKER__) || defined(__ASSEMBLER__))
 static inline uint32_t tamp_bkpr(uint32_t idx)
 {
 	return TAMP_BKP_REGISTER_BASE + (idx << 2);
diff --git a/services/spd/opteed/opteed_private.h b/services/spd/opteed/opteed_private.h
index 847b9c5c1a0c93ec1d1caf5bbdd7a082be9fdc4e..242154f0ecf135983057faf8b66df49371c73d23 100644
--- a/services/spd/opteed/opteed_private.h
+++ b/services/spd/opteed/opteed_private.h
@@ -79,7 +79,7 @@
 #define OPTEED_C_RT_CTX_SIZE		0x60
 #define OPTEED_C_RT_CTX_ENTRIES		(OPTEED_C_RT_CTX_SIZE >> DWORD_SHIFT)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -157,6 +157,6 @@ void opteed_init_optee_ep_state(struct entry_point_info *optee_entry_point,
 extern optee_context_t opteed_sp_context[OPTEED_CORE_COUNT];
 extern uint32_t opteed_rw;
 extern struct optee_vectors *optee_vector_table;
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* OPTEED_PRIVATE_H */
diff --git a/services/spd/tlkd/tlkd_private.h b/services/spd/tlkd/tlkd_private.h
index 53f9e20c30961e333e759bbc8c393e117fb426c7..5d5d0e8590cb19ef1a84e028f86bada02e48f678 100644
--- a/services/spd/tlkd/tlkd_private.h
+++ b/services/spd/tlkd/tlkd_private.h
@@ -71,7 +71,7 @@
 #define TLKD_C_RT_CTX_SIZE		0x60
 #define TLKD_C_RT_CTX_ENTRIES		(TLKD_C_RT_CTX_SIZE >> DWORD_SHIFT)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -119,6 +119,6 @@ void tlkd_init_tlk_ep_state(struct entry_point_info *tlk_entry_point,
 				uint64_t pc,
 				tlk_context_t *tlk_ctx);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* TLKD_PRIVATE_H */
diff --git a/services/spd/tspd/tspd_private.h b/services/spd/tspd/tspd_private.h
index 50f3b875e58c30f5bcb2f335c4e3ad522cc019e1..a81eb212ed21d8424c08b178ae6544558d4e4933 100644
--- a/services/spd/tspd/tspd_private.h
+++ b/services/spd/tspd/tspd_private.h
@@ -126,7 +126,7 @@
 #define TSPD_SP_CTX_SIZE	0x90
 #define TSPD_SP_CTX_ENTRIES		(TSPD_SP_CTX_SIZE >> DWORD_SHIFT)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -227,6 +227,6 @@ uint64_t tspd_handle_sp_preemption(void *handle);
 
 extern tsp_context_t tspd_sp_context[TSPD_CORE_COUNT];
 extern tsp_vectors_t *tsp_vectors;
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* TSPD_PRIVATE_H */
diff --git a/services/std_svc/spm/spm_private.h b/services/std_svc/spm/spm_private.h
index 740fee58b089ee2f06ee9b8b9fb7729ceb4c75d4..efc91cb41d78f3fe1a2db03077fd0419d1d43e88 100644
--- a/services/std_svc/spm/spm_private.h
+++ b/services/std_svc/spm/spm_private.h
@@ -32,7 +32,7 @@
 /* Value returned by spm_sp_synchronous_entry() when a partition is preempted */
 #define SPM_SECURE_PARTITION_PREEMPTED	U(0x1234)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -114,6 +114,6 @@ int spm_response_add(uint16_t client_id, uint16_t handle, uint32_t token,
 int spm_response_get(uint16_t client_id, uint16_t handle, uint32_t token,
 		     u_register_t *x1, u_register_t *x2, u_register_t *x3);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* SPM_PRIVATE_H */
diff --git a/services/std_svc/spm_mm/spm_private.h b/services/std_svc/spm_mm/spm_private.h
index 8e94a282464739a8ab337b65a9bbd1f0da8f2593..ba94a4d0884fd53f7fb496c689df4e318d14761b 100644
--- a/services/std_svc/spm_mm/spm_private.h
+++ b/services/std_svc/spm_mm/spm_private.h
@@ -29,7 +29,7 @@
 #define SP_C_RT_CTX_SIZE	0x60
 #define SP_C_RT_CTX_ENTRIES	(SP_C_RT_CTX_SIZE >> DWORD_SHIFT)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -66,6 +66,6 @@ int spm_memory_attributes_set_smc_handler(sp_context_t *sp_ctx,
 					  u_register_t pages_count,
 					  u_register_t smc_attributes);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* SPM_PRIVATE_H */