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u-boot/tools/Makefile
Paul Burton 703ec9ddf9 MIPS: Stop building position independent code 
U-Boot has up until now built with -fpic for the MIPS architecture,
producing position independent code which uses indirection through a
global offset table, making relocation fairly straightforward as it
simply involves patching up GOT entries.

Using -fpic does however have some downsides. The biggest of these is
that generated code is bloated in various ways. For example, function
calls are indirected through the GOT & the t9 register:

  8f998064   lw     t9,-32668(gp)
  0320f809   jalr   t9

Without -fpic the call is simply:

  0f803f01   jal    be00fc04 <puts>

This is more compact & faster (due to the lack of the load & the
dependency the jump has on its result). It is also easier to read &
debug because the disassembly shows what function is being called,
rather than just an offset from gp which would then have to be looked up
in the ELF to discover the target function.

Another disadvantage of -fpic is that each function begins with a
sequence to calculate the value of the gp register, for example:

  3c1c0004   lui    gp,0x4
  279c3384   addiu  gp,gp,13188
  0399e021   addu   gp,gp,t9

Without using -fpic this sequence no longer appears at the start of each
function, reducing code size considerably.

This patch switches U-Boot from building with -fpic to building with
-fno-pic, in order to gain the benefits described above. The cost of
this is an extra step during the build process to extract relocation
data from the ELF & write it into a new .rel section in a compact
format, plus the added complexity of dealing with multiple types of
relocation rather than the single type that applied to the GOT. The
benefit is smaller, cleaner, more debuggable code. The relocate_code()
function is reimplemented in C to handle the new relocation scheme,
which also makes it easier to read & debug.

Taking maltael_defconfig as an example the size of u-boot.bin built
using the Codescape MIPS 2016.05-06 toolchain (gcc 4.9.2, binutils
2.24.90) shrinks from 254KiB to 224KiB.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: u-boot@lists.denx.de
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Tested-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2017-07-25 20:44:00 +02:00

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Makefile
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#
# (C) Copyright 2000-2006
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# SPDX-License-Identifier: GPL-2.0+
#
# Enable all the config-independent tools
ifneq ($(HOST_TOOLS_ALL),)
CONFIG_LCD_LOGO = y
CONFIG_CMD_LOADS = y
CONFIG_CMD_NET = y
CONFIG_XWAY_SWAP_BYTES = y
CONFIG_NETCONSOLE = y
CONFIG_SHA1_CHECK_UB_IMG = y
CONFIG_ARCH_SUNXI = y
endif
subdir-$(HOST_TOOLS_ALL) += easylogo
subdir-$(HOST_TOOLS_ALL) += gdb
# Merge all the different vars for envcrc into one
ENVCRC-$(CONFIG_ENV_IS_EMBEDDED) = y
ENVCRC-$(CONFIG_ENV_IS_IN_DATAFLASH) = y
ENVCRC-$(CONFIG_ENV_IS_IN_EEPROM) = y
ENVCRC-$(CONFIG_ENV_IS_IN_FLASH) = y
ENVCRC-$(CONFIG_ENV_IS_IN_ONENAND) = y
ENVCRC-$(CONFIG_ENV_IS_IN_NAND) = y
ENVCRC-$(CONFIG_ENV_IS_IN_NVRAM) = y
ENVCRC-$(CONFIG_ENV_IS_IN_SPI_FLASH) = y
CONFIG_BUILD_ENVCRC ?= $(ENVCRC-y)
hostprogs-$(CONFIG_SPL_GENERATE_ATMEL_PMECC_HEADER) += atmel_pmecc_params
hostprogs-$(CONFIG_LCD_LOGO) += bmp_logo
hostprogs-$(CONFIG_VIDEO_LOGO) += bmp_logo
HOSTCFLAGS_bmp_logo.o := -pedantic
hostprogs-$(CONFIG_BUILD_ENVCRC) += envcrc
envcrc-objs := envcrc.o lib/crc32.o common/env_embedded.o lib/sha1.o
hostprogs-$(CONFIG_CMD_NET) += gen_eth_addr
HOSTCFLAGS_gen_eth_addr.o := -pedantic
hostprogs-$(CONFIG_CMD_NET) += gen_ethaddr_crc
gen_ethaddr_crc-objs := gen_ethaddr_crc.o lib/crc8.o
HOSTCFLAGS_gen_ethaddr_crc.o := -pedantic
hostprogs-$(CONFIG_CMD_LOADS) += img2srec
HOSTCFLAGS_img2srec.o := -pedantic
hostprogs-$(CONFIG_XWAY_SWAP_BYTES) += xway-swap-bytes
HOSTCFLAGS_xway-swap-bytes.o := -pedantic
hostprogs-y += mkenvimage
mkenvimage-objs := mkenvimage.o os_support.o lib/crc32.o
hostprogs-y += dumpimage mkimage
hostprogs-$(CONFIG_FIT_SIGNATURE) += fit_info fit_check_sign
FIT_SIG_OBJS-$(CONFIG_FIT_SIGNATURE) := common/image-sig.o
# Flattened device tree objects
LIBFDT_CSRCS := fdt.c fdt_ro.c fdt_wip.c fdt_sw.c fdt_rw.c fdt_strerror.c \
fdt_empty_tree.c fdt_addresses.c fdt_overlay.c \
fdt_region.c
# Unfortunately setup.py below cannot handle srctree being ".." which it often
# is. It fails with an error like:
# Fatal error: can't create build/temp.linux-x86_64-2.7/../lib/libfdt/fdt.o:
# No such file or directory
# To fix this, use an absolute path.
libfdt_tree := $(shell readlink -f $(srctree)/lib/libfdt)
LIBFDT_SRCS := $(addprefix $(libfdt_tree)/, $(LIBFDT_CSRCS))
LIBFDT_SWIG := $(addprefix $(libfdt_tree)/, pylibfdt/libfdt.i)
LIBFDT_OBJS := $(addprefix lib/libfdt/, $(patsubst %.c, %.o, $(LIBFDT_CSRCS)))
RSA_OBJS-$(CONFIG_FIT_SIGNATURE) := $(addprefix lib/rsa/, \
rsa-sign.o rsa-verify.o rsa-checksum.o \
rsa-mod-exp.o)
ROCKCHIP_OBS = lib/rc4.o rkcommon.o rkimage.o rksd.o rkspi.o
# common objs for dumpimage and mkimage
dumpimage-mkimage-objs := aisimage.o \
atmelimage.o \
$(FIT_SIG_OBJS-y) \
common/bootm.o \
lib/crc32.o \
default_image.o \
lib/fdtdec_common.o \
lib/fdtdec.o \
fit_common.o \
fit_image.o \
common/image-fit.o \
image-host.o \
common/image.o \
imagetool.o \
imximage.o \
kwbimage.o \
lib/md5.o \
lpc32xximage.o \
mxsimage.o \
omapimage.o \
os_support.o \
pblimage.o \
pbl_crc32.o \
vybridimage.o \
$(ROCKCHIP_OBS) \
socfpgaimage.o \
lib/sha1.o \
lib/sha256.o \
common/hash.o \
ublimage.o \
zynqimage.o \
zynqmpimage.o \
$(LIBFDT_OBJS) \
gpimage.o \
gpimage-common.o \
$(RSA_OBJS-y)
dumpimage-objs := $(dumpimage-mkimage-objs) dumpimage.o
mkimage-objs := $(dumpimage-mkimage-objs) mkimage.o
fit_info-objs := $(dumpimage-mkimage-objs) fit_info.o
fit_check_sign-objs := $(dumpimage-mkimage-objs) fit_check_sign.o
# Unfortunately setup.py (or actually the Python distutil implementation)
# puts files into the same directory as the .i file. We cannot touch the source
# directory, so we copy the .i file into the tools/ build subdirectory before
# calling setup. This directory is safe to write to. This ensures that we get
# all three files in $(obj)/tools: _libfdt.so, libfdt.py and libfdt_wrap.c
# The latter is a temporary file which we could actually remove.
tools/_libfdt.so: $(LIBFDT_SRCS) $(LIBFDT_SWIG)
cp $(LIBFDT_SWIG) tools/.
unset CC; \
unset CROSS_COMPILE; \
LDFLAGS="$(HOSTLDFLAGS)" CFLAGS= VERSION="u-boot-$(UBOOTVERSION)" \
CPPFLAGS="$(_hostc_flags)" OBJDIR=tools \
SOURCES="$(LIBFDT_SRCS) tools/libfdt.i" \
SWIG_OPTS="-I$(srctree)/lib/libfdt -I$(srctree)/lib" \
$(libfdt_tree)/pylibfdt/setup.py --quiet build_ext \
--build-lib tools
ifneq ($(CONFIG_MX23)$(CONFIG_MX28),)
# Add CONFIG_MXS into host CFLAGS, so we can check whether or not register
# the mxsimage support within tools/mxsimage.c .
HOSTCFLAGS_mxsimage.o += -DCONFIG_MXS
endif
ifdef CONFIG_FIT_SIGNATURE
# This affects include/image.h, but including the board config file
# is tricky, so manually define this options here.
HOST_EXTRACFLAGS += -DCONFIG_FIT_SIGNATURE
endif
ifdef CONFIG_SYS_U_BOOT_OFFS
HOSTCFLAGS_kwbimage.o += -DCONFIG_SYS_U_BOOT_OFFS=$(CONFIG_SYS_U_BOOT_OFFS)
endif
ifneq ($(CONFIG_ARMADA_38X)$(CONFIG_ARMADA_39X),)
HOSTCFLAGS_kwbimage.o += -DCONFIG_KWB_SECURE
endif
# MXSImage needs LibSSL
ifneq ($(CONFIG_MX23)$(CONFIG_MX28)$(CONFIG_ARMADA_38X)$(CONFIG_ARMADA_39X)$(CONFIG_FIT_SIGNATURE),)
HOSTLOADLIBES_mkimage += \
$(shell pkg-config --libs libssl libcrypto 2> /dev/null || echo "-lssl -lcrypto")
# OS X deprecate openssl in favour of CommonCrypto, supress deprecation
# warnings on those systems
ifeq ($(HOSTOS),darwin)
HOSTCFLAGS_mxsimage.o += -Wno-deprecated-declarations
HOSTCFLAGS_image-sig.o += -Wno-deprecated-declarations
HOSTCFLAGS_rsa-sign.o += -Wno-deprecated-declarations
endif
endif
HOSTCFLAGS_fit_image.o += -DMKIMAGE_DTC=\"$(DTC)\"
HOSTLOADLIBES_dumpimage := $(HOSTLOADLIBES_mkimage)
HOSTLOADLIBES_fit_info := $(HOSTLOADLIBES_mkimage)
HOSTLOADLIBES_fit_check_sign := $(HOSTLOADLIBES_mkimage)
hostprogs-$(CONFIG_EXYNOS5250) += mkexynosspl
hostprogs-$(CONFIG_EXYNOS5420) += mkexynosspl
HOSTCFLAGS_mkexynosspl.o := -pedantic
ifdtool-objs := $(LIBFDT_OBJS) ifdtool.o
hostprogs-$(CONFIG_X86) += ifdtool
hostprogs-$(CONFIG_MX23) += mxsboot
hostprogs-$(CONFIG_MX28) += mxsboot
HOSTCFLAGS_mxsboot.o := -pedantic
hostprogs-$(CONFIG_ARCH_SUNXI) += mksunxiboot
hostprogs-$(CONFIG_ARCH_SUNXI) += sunxi-spl-image-builder
sunxi-spl-image-builder-objs := sunxi-spl-image-builder.o lib/bch.o
hostprogs-$(CONFIG_NETCONSOLE) += ncb
hostprogs-$(CONFIG_SHA1_CHECK_UB_IMG) += ubsha1
ubsha1-objs := os_support.o ubsha1.o lib/sha1.o
HOSTCFLAGS_ubsha1.o := -pedantic
hostprogs-$(CONFIG_KIRKWOOD) += kwboot
hostprogs-$(CONFIG_ARCH_MVEBU) += kwboot
hostprogs-y += proftool
hostprogs-$(CONFIG_STATIC_RELA) += relocate-rela
hostprogs-y += fdtgrep
fdtgrep-objs += $(LIBFDT_OBJS) fdtgrep.o
hostprogs-$(CONFIG_MIPS) += mips-relocs
# We build some files with extra pedantic flags to try to minimize things
# that won't build on some weird host compiler -- though there are lots of
# exceptions for files that aren't complaint.
HOSTCFLAGS_crc32.o := -pedantic
HOSTCFLAGS_crc8.o := -pedantic
HOSTCFLAGS_md5.o := -pedantic
HOSTCFLAGS_sha1.o := -pedantic
HOSTCFLAGS_sha256.o := -pedantic
quiet_cmd_wrap = WRAP $@
cmd_wrap = echo "\#include <../$(patsubst $(obj)/%,%,$@)>" >$@
$(obj)/lib/%.c $(obj)/common/%.c:
$(call cmd,wrap)
clean-dirs := lib common
always := $(hostprogs-y)
# Build a libfdt Python module if swig is available
# Use 'sudo apt-get install swig libpython-dev' to enable this
always += $(if $(shell which swig 2> /dev/null),_libfdt.so)
# Generated LCD/video logo
LOGO_H = $(objtree)/include/bmp_logo.h
LOGO_DATA_H = $(objtree)/include/bmp_logo_data.h
LOGO-$(CONFIG_LCD_LOGO) += $(LOGO_H)
LOGO-$(CONFIG_LCD_LOGO) += $(LOGO_DATA_H)
LOGO-$(CONFIG_VIDEO_LOGO) += $(LOGO_H)
LOGO-$(CONFIG_VIDEO_LOGO) += $(LOGO_DATA_H)
# Generic logo
ifeq ($(LOGO_BMP),)
LOGO_BMP= $(srctree)/$(src)/logos/denx.bmp
# Use board logo and fallback to vendor
ifneq ($(wildcard $(srctree)/$(src)/logos/$(BOARD).bmp),)
LOGO_BMP= $(srctree)/$(src)/logos/$(BOARD).bmp
else
ifneq ($(wildcard $(srctree)/$(src)/logos/$(VENDOR).bmp),)
LOGO_BMP= $(srctree)/$(src)/logos/$(VENDOR).bmp
endif
endif
endif # !LOGO_BMP
#
# Use native tools and options
# Define __KERNEL_STRICT_NAMES to prevent typedef overlaps
# Define _GNU_SOURCE to obtain the getline prototype from stdio.h
#
HOST_EXTRACFLAGS += -include $(srctree)/include/libfdt_env.h \
$(patsubst -I%,-idirafter%, $(filter -I%, $(UBOOTINCLUDE))) \
-I$(srctree)/lib/libfdt \
-I$(srctree)/tools \
-DUSE_HOSTCC \
-D__KERNEL_STRICT_NAMES \
-D_GNU_SOURCE
__build: $(LOGO-y)
$(LOGO_H): $(obj)/bmp_logo $(LOGO_BMP)
$(obj)/bmp_logo --gen-info $(LOGO_BMP) > $@
$(LOGO_DATA_H): $(obj)/bmp_logo $(LOGO_BMP)
$(obj)/bmp_logo --gen-data $(LOGO_BMP) > $@
# Let clean descend into subdirs
subdir- += env
ifneq ($(CROSS_BUILD_TOOLS),)
override HOSTCC = $(CC)
quiet_cmd_crosstools_strip = STRIP $^
cmd_crosstools_strip = $(STRIP) $^; touch $@
$(obj)/.strip: $(call objectify,$(filter $(always),$(hostprogs-y)))
$(call cmd,crosstools_strip)
always += .strip
endif
clean-files += .strip
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