fix(rockchip): add support for building with LTO enabled

Using the asm .incbin statement in C sources breaks gcc wrapper.
Build fails with a following errors:
  /tmp/ccRXHTU4.s: Assembler messages:
  /tmp/ccRXHTU4.s:34: Warning: dwarf line number information for .pmusram.incbin ignored
  ...
  /tmp/ccRXHTU4.s:2119: Warning: dwarf line number information for .pmusram.incbin ignored
  /tmp/ccRXHTU4.s:112497: Error: leb128 operand is an undefined symbol: .LVU5
  /tmp/ccRXHTU4.s:112498: Error: leb128 operand is an undefined symbol: .LVU6
  /tmp/ccRXHTU4.s:112507: Error: leb128 operand is an undefined symbol: .LVU9
  ...
  /tmp/ccRXHTU4.s:115407: Error: leb128 operand is an undefined symbol: .LVU668
  /tmp/ccRXHTU4.s:115408: Error: leb128 operand is an undefined symbol: .LVU710
  /tmp/ccRXHTU4.s:115409: Error: leb128 operand is an undefined symbol: .LVU713
  lto-wrapper: fatal error: aarch64-none-elf-gcc returned 1 exit status
  compilation terminated.
  aarch64-none-elf/bin/ld: error: lto-wrapper failed
  collect2: error: ld returned 1 exit status

Fix it in a similar way to what the Linux kernel does, see commit
919aa45e43a84d40c27c83f6117cfa6542cee14e (MODSIGN: Avoid using .incbin
in C source). [1]

1. https://lkml.org/lkml/2012/12/4/136

Change-Id: Iecc19729ce59e8c3b3c30fa37b1fddef95e83c96
Signed-off-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>

plat/rockchip/rk3399/drivers/pmu/pmu_fw.S

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2024, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* convoluted way to make sure that the define is pasted just the right way */
+.macro INCBIN file sym sec
+	.section \sec
+	.global \sym
+	.type \sym, @object
+	.align 4
+\sym :
+	.incbin \file
+	.size \sym , .-\sym
+	.global \sym\()_end
+\sym\()_end :
+.endm
+
+INCBIN ""RK3399M0FW"", "rk3399m0_bin", ".sram.incbin"
+INCBIN ""RK3399M0PMUFW"", "rk3399m0pmu_bin", ".pmusram.incbin"

plat/rockchip/rk3399/drivers/pmu/pmu_fw.c

@@ -1,22 +0,0 @@
-/*
- * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-/* convoluted way to make sure that the define is pasted just the right way */
-#define INCBIN(file, sym, sec) \
-	__asm__( \
-		".section " sec "\n" \
-		".global " sym "\n" \
-		".type " sym ", %object\n" \
-		".align 4\n" \
-		sym ":\n" \
-		".incbin \"" file "\"\n" \
-		".size " sym ", .-" sym "\n" \
-		".global " sym "_end\n" \
-		sym "_end:\n" \
-	)
-
-INCBIN(RK3399M0FW, "rk3399m0_bin", ".sram.incbin");
-INCBIN(RK3399M0PMUFW, "rk3399m0pmu_bin", ".pmusram.incbin");

plat/rockchip/rk3399/platform.mk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2016-2020, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2016-2024, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -61,7 +61,7 @@ BL31_SOURCES	+=	${RK_GIC_SOURCES}				\
 			${RK_PLAT_SOC}/plat_sip_calls.c			\
 			${RK_PLAT_SOC}/drivers/gpio/rk3399_gpio.c	\
 			${RK_PLAT_SOC}/drivers/pmu/pmu.c		\
-			${RK_PLAT_SOC}/drivers/pmu/pmu_fw.c		\
+			${RK_PLAT_SOC}/drivers/pmu/pmu_fw.S		\
 			${RK_PLAT_SOC}/drivers/pmu/m0_ctl.c		\
 			${RK_PLAT_SOC}/drivers/pwm/pwm.c		\
 			${RK_PLAT_SOC}/drivers/secure/secure.c		\
@@ -102,7 +102,7 @@ endif
 # CCACHE_EXTRAFILES is needed because ccache doesn't handle .incbin
 export CCACHE_EXTRAFILES
 ${BUILD_PLAT}/bl31/pmu_fw.o: CCACHE_EXTRAFILES=$(RK3399M0FW):$(RK3399M0PMUFW)
-${RK_PLAT_SOC}/drivers/pmu/pmu_fw.c: $(RK3399M0FW)
+${RK_PLAT_SOC}/drivers/pmu/pmu_fw.S: $(RK3399M0FW)
 
 $(eval $(call MAKE_PREREQ_DIR,${BUILD_M0},${BUILD_PLAT}))
 .PHONY: $(RK3399M0FW)