u-boot/arch/arm/config.mk
Stefan Agner 75d7a0d7f1 arm: build arch memset/memcpy in Thumb2 mode
Resynchronize memcpy/memset with kernel 3.17 and build them in
Thumb2 mode (unified syntax). Those assembler files can be built
and linked in ARM mode too, however when calling them from Thumb2
built code, the stack got corrupted and the copy did not succeed
(the exact details have not been traced back). However, the Linux
kernel builds those files in Thumb2 mode. Hence U-Boot should
build them in Thumb2 mode too when CONFIG_SYS_THUMB_BUILD is set.

To build the files without warning, some assembler instructions
had to be replaced with their UAL compliant variant (thanks
Jeroen for this input).

To build the file in Thumb2 mode the implicit-it=always option need
to be set to generate Thumb2 compliant IT instructions where needed.
We add this option to the general AFLAGS when building for Thumb2.

Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Stefan Agner <stefan@agner.ch>
2015-01-09 10:20:22 -05:00

137 lines
3.7 KiB
Makefile

#
# (C) Copyright 2000-2002
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# SPDX-License-Identifier: GPL-2.0+
#
ifndef CONFIG_STANDALONE_LOAD_ADDR
ifneq ($(CONFIG_OMAP_COMMON),)
CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
else
CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
endif
endif
LDFLAGS_FINAL += --gc-sections
PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \
-fno-common -ffixed-r9
PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) \
$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
# Support generic board on ARM
__HAVE_ARCH_GENERIC_BOARD := y
PLATFORM_CPPFLAGS += -D__ARM__
# Choose between ARM/Thumb instruction sets
ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
AFLAGS_IMPLICIT_IT := $(call as-option,-Wa$(comma)-mimplicit-it=always)
PF_CPPFLAGS_ARM := $(AFLAGS_IMPLICIT_IT) \
$(call cc-option, -mthumb -mthumb-interwork,\
$(call cc-option,-marm,)\
$(call cc-option,-mno-thumb-interwork,)\
)
else
PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
$(call cc-option,-mno-thumb-interwork,)
endif
# Only test once
ifneq ($(CONFIG_SPL_BUILD),y)
ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
archprepare: checkthumb
checkthumb:
@if test "$(call cc-version)" -lt "0404"; then \
echo -n '*** Your GCC does not produce working '; \
echo 'binaries in THUMB mode.'; \
echo '*** Your board is configured for THUMB mode.'; \
false; \
fi
endif
endif
# Try if EABI is supported, else fall back to old API,
# i. e. for example:
# - with ELDK 4.2 (EABI supported), use:
# -mabi=aapcs-linux
# - with ELDK 4.1 (gcc 4.x, no EABI), use:
# -mabi=apcs-gnu
# - with ELDK 3.1 (gcc 3.x), use:
# -mapcs-32
PF_CPPFLAGS_ABI := $(call cc-option,\
-mabi=aapcs-linux,\
$(call cc-option,\
-mapcs-32,\
$(call cc-option,\
-mabi=apcs-gnu,\
)\
)\
)
PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
# For EABI, make sure to provide raise()
ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
# This file is parsed many times, so the string may get added multiple
# times. Also, the prefix needs to be different based on whether
# CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
# before adding the correct one.
PLATFORM_LIBS := arch/arm/lib/eabi_compat.o \
$(filter-out arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
endif
# needed for relocation
LDFLAGS_u-boot += -pie
#
# FIXME: binutils versions < 2.22 have a bug in the assembler where
# branches to weak symbols can be incorrectly optimized in thumb mode
# to a short branch (b.n instruction) that won't reach when the symbol
# gets preempted
#
# http://sourceware.org/bugzilla/show_bug.cgi?id=12532
#
ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
ifeq ($(GAS_BUG_12532),)
export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
then echo y; else echo n; fi)
endif
ifeq ($(GAS_BUG_12532),y)
PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
endif
endif
ifneq ($(CONFIG_SPL_BUILD),y)
# Check that only R_ARM_RELATIVE relocations are generated.
ALL-y += checkarmreloc
# The movt / movw can hardcode 16 bit parts of the addresses in the
# instruction. Relocation is not supported for that case, so disable
# such usage by requiring word relocations.
PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
endif
# limit ourselves to the sections we want in the .bin.
ifdef CONFIG_ARM64
OBJCOPYFLAGS += -j .text -j .rodata -j .data -j .u_boot_list -j .rela.dyn
else
OBJCOPYFLAGS += -j .text -j .secure_text -j .rodata -j .hash -j .data -j .got.plt -j .u_boot_list -j .rel.dyn
endif
ifdef CONFIG_OF_EMBED
OBJCOPYFLAGS += -j .dtb.init.rodata
endif
ifneq ($(CONFIG_IMX_CONFIG),)
ifdef CONFIG_SPL
ifndef CONFIG_SPL_BUILD
ALL-y += SPL
endif
else
ifeq ($(CONFIG_OF_SEPARATE),y)
ALL-y += u-boot-dtb.imx
else
ALL-y += u-boot.imx
endif
endif
endif