contrib/loaders: Enforce Little Endian ARM machine code

arm-none-eabi target triplet defaults to Little Endian, and so far any
submitted machine code snippets have been verified to be Little Endian.
However a user might override [ARM_]CROSS_COMPILE with an armeb toolchain,
potentially resulting in invalid machine code.

Let's be safe and enforce Little Endian mode for assembler and compiler.

Change-Id: I9cefe24689eaded25d60ffb1f254b254e8d76f9d
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-on: http://openocd.zylin.com/3498
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

contrib/loaders/checksum/Makefile

@@ -4,10 +4,12 @@ ARM_CROSS_COMPILE ?= arm-none-eabi-
 ARM_AS      ?= $(ARM_CROSS_COMPILE)as
 ARM_OBJCOPY ?= $(ARM_CROSS_COMPILE)objcopy
 
+ARM_AFLAGS = -EL
+
 arm: armv4_5_crc.inc armv7m_crc.inc
 
 armv4_5_%.elf: armv4_5_%.s
-	$(ARM_AS) $< -o $@
+	$(ARM_AS) $(ARM_AFLAGS) $< -o $@
 
 armv4_5_%.bin: armv4_5_%.elf
 	$(ARM_OBJCOPY) -Obinary $< $@
@@ -16,7 +18,7 @@ armv4_5_%.inc: armv4_5_%.bin
 	$(BIN2C) < $< > $@
 
 armv7m_%.elf: armv7m_%.s
-	$(ARM_AS) $< -o $@
+	$(ARM_AS) $(ARM_AFLAGS) $< -o $@
 
 armv7m_%.bin: armv7m_%.elf
 	$(ARM_OBJCOPY) -Obinary $< $@

contrib/loaders/erase_check/Makefile

@@ -4,10 +4,12 @@ ARM_CROSS_COMPILE ?= arm-none-eabi-
 ARM_AS      ?= $(ARM_CROSS_COMPILE)as
 ARM_OBJCOPY ?= $(ARM_CROSS_COMPILE)objcopy
 
+ARM_AFLAGS = -EL
+
 arm: armv4_5_erase_check.inc armv7m_erase_check.inc armv7m_0_erase_check.inc
 
 armv4_5_%.elf: armv4_5_%.s
-	$(ARM_AS) $< -o $@
+	$(ARM_AS) $(ARM_AFLAGS) $< -o $@
 
 armv4_5_%.bin: armv4_5_%.elf
 	$(ARM_OBJCOPY) -Obinary $< $@
@@ -16,7 +18,7 @@ armv4_5_%.inc: armv4_5_%.bin
 	$(BIN2C) < $< > $@
 
 armv7m_%.elf: armv7m_%.s
-	$(ARM_AS) $< -o $@
+	$(ARM_AS) $(ARM_AFLAGS) $< -o $@
 
 armv7m_%.bin: armv7m_%.elf
 	$(ARM_OBJCOPY) -Obinary $< $@

contrib/loaders/flash/fm4/Makefile

@@ -6,6 +6,8 @@ CC=$(CROSS_COMPILE)gcc
 OBJCOPY=$(CROSS_COMPILE)objcopy
 OBJDUMP=$(CROSS_COMPILE)objdump
 
+CFLAGS = -static -nostartfiles -mlittle-endian -Wa,-EL
+
 all: erase.inc write.inc
 
 .PHONY: clean
@@ -15,7 +17,7 @@ all: erase.inc write.inc
 erase.elf write.elf: fm4.h
 
 %.elf: %.S
-	$(CC) -static -nostartfiles $< -o $@
+	$(CC) $(CFLAGS) $< -o $@
 
 %.lst: %.elf
 	$(OBJDUMP) -S $< > $@

contrib/loaders/flash/kinetis_ke/Makefile

@@ -4,10 +4,12 @@ CROSS_COMPILE ?= arm-none-eabi-
 AS      = $(CROSS_COMPILE)as
 OBJCOPY = $(CROSS_COMPILE)objcopy
 
+AFLAGS = -EL
+
 all: kinetis_ke_flash.inc kinetis_ke_watchdog.inc
 
 %.elf: %.s
-	$(AS) $< -o $@
+	$(AS) $(AFLAGS) $< -o $@
 
 %.bin: %.elf
 	$(OBJCOPY) -Obinary $< $@

contrib/loaders/flash/xmc1xxx/Makefile

@@ -6,6 +6,8 @@ CC=$(CROSS_COMPILE)gcc
 OBJCOPY=$(CROSS_COMPILE)objcopy
 OBJDUMP=$(CROSS_COMPILE)objdump
 
+CFLAGS = -static -nostartfiles -mlittle-endian -Wa,-EL
+
 all: erase.inc erase_check.inc write.inc
 
 .PHONY: clean
@@ -15,7 +17,7 @@ all: erase.inc erase_check.inc write.inc
 erase.elf erase_check.elf write.elf: xmc1xxx.S
 
 %.elf: %.S
-	$(CC) -static -nostartfiles $< -o $@
+	$(CC) $(CFLAGS) $< -o $@
 
 %.lst: %.elf
 	$(OBJDUMP) -S $< > $@

contrib/loaders/watchdog/Makefile

@@ -4,10 +4,12 @@ ARM_CROSS_COMPILE ?= arm-none-eabi-
 ARM_AS      ?= $(ARM_CROSS_COMPILE)as
 ARM_OBJCOPY ?= $(ARM_CROSS_COMPILE)objcopy
 
+ARM_AFLAGS = -EL -mthumb
+
 arm: armv7m_kinetis_wdog.inc
 
 armv7m_%.elf: armv7m_%.s
-	$(ARM_AS) -mthumb $< -o $@
+	$(ARM_AS) $(ARM_AFLAGS) $< -o $@
 
 armv7m_%.bin: armv7m_%.elf
 	$(ARM_OBJCOPY) -Obinary $< $@