UPX /src/stub/Makefile 编译 armv7

1. 编译不同平台对应的 GCC 不同，这个是编译为 arm32，对应的 gcc 是 arm-linux-androideabi-gcc，这个 GCC 的安装命令： sudo apt-get install gcc-arm-linux-androideabi

-march 对应的是系统架构，在跟踪 UPX 源码的时候，armv7 的 so 文件对应这个

arm.v5t-linux.shlib%.h : tc_list = arm.v5t-linux.elf default
arm.v5t-linux.shlib%.h : tc_bfdname = elf32-littlearm

tc.arm.v5t-linux.elf.gcc  = arm-linux-androideabi-gcc -march=armv5t

arm.v5t-linux.shlib%.h : $(srcdir)/src/$$T.S
    $(call tc,gcc) -c -x assembler-with-cpp $< -o tmp/$T.bin
    $(call tc,f-embed_objinfo,tmp/$T.bin)
    $(call tc,bin2h-c) tmp/$T.bin $@

在 /src/stub/ 目录下：make 进行编译

2. 下面是把原 Makefile 文件的 multiarch 改为 arm-linux-androideabi：

# default multiarch-binutils
tc.default.m-ar       = arm-linux-androideabi-ar
tc.default.m-ld       = arm-linux-androideabi-ld $(if $(tc_bfdname),-b $(tc_bfdname))
tc.default.m-nm       = arm-linux-androideabi-nm $(if $(tc_bfdname),--target=$(tc_bfdname))
tc.default.m-objcopy  = arm-linux-androideabi-objcopy $(if $(tc_bfdname),-F $(tc_bfdname))
tc.default.m-objdump  = arm-linux-androideabi-objdump $(if $(tc_bfdname),-b $(tc_bfdname)) $(if $(tc_bfdarch),-m $(tc_bfdarch))
tc.default.m-readelf  = arm-linux-androideabi-readelf

# default binutils
tc.default.ld         = $(call tc,m-ld)
tc.default.nm         = $(call tc,m-nm)
tc.default.objcopy    = $(call tc,m-objcopy)
tc.default.objdump    = $(call tc,m-objdump)
tc.default.readelf    = $(call tc,m-readelf)

3. 删除了其他平台架构的条目，只留以下的一个

# /***********************************************************************
# // arm.v5t-linux.shlib (arm.v5t)
# ************************************************************************/

arm.v5t-linux.shlib%.h : tc_list = arm.v5t-linux.elf default
arm.v5t-linux.shlib%.h : tc_bfdname = elf32-littlearm

tc.arm.v5t-linux.elf.gcc  = arm-linux-androideabi-gcc -march=armv5t

arm.v5t-linux.shlib%.h : $(srcdir)/src/$$T.S
    $(call tc,gcc) -c -x assembler-with-cpp $< -o tmp/$T.bin
    $(call tc,f-embed_objinfo,tmp/$T.bin)
    $(call tc,bin2h-c) tmp/$T.bin $@

4. arm64 GCC 安装

gcc host.c -o host_32 -m32 //生成 32 位的 elf x86 文件...默认是 64 位的
gcc -v // 查看版本信息

arm-linux-androideabi-gcc host.c -o host_arm //生成 arm 汇编的 elf 文件

sudo apt-get install gcc-aarch64-linux-gnu // 安装 arm64 交叉编译环境

5. 附 arm64 Makefile 文件

#
# UPX stub Makefile - needs GNU make 3.81 or better
#
# You also will need a number of special build tools like various
# cross-assemblers and cross-compilers - please see README.SRC
# for details.
#
# Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer
#

MAKEFLAGS += -rR
.SUFFIXES:
.SECONDEXPANSION:
.NOTPARALLEL:
export LC_ALL = C
export SHELL = /bin/sh

# internal make variables
comma := ,
empty :=
space := $(empty) $(empty)
tab   := $(empty)   $(empty)

ifneq ($(findstring $(firstword $(MAKE_VERSION)),3.77 3.78 3.78.1 3.79 3.79.1 3.80),)
$(error GNU make 3.81 or better is required)
endif

ifndef srcdir
srcdir := $(dir $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST)))
srcdir := $(shell echo '$(srcdir)' | sed 's,/*$$,,')
endif
ifndef top_srcdir
top_srcdir := $(srcdir)/../..
endif
include $(wildcard $(top_srcdir)/Makevars.global ./Makevars.local)

# update $PATH for our special stub build tools
ifneq ($(wildcard $(HOME)/local/bin/bin-upx/upx-stubtools-check-version),)
export PATH := $(HOME)/local/bin/bin-upx:$(PATH)
else ifneq ($(wildcard $(HOME)/.local/bin/bin-upx/upx-stubtools-check-version),)
export PATH := $(HOME)/.local/bin/bin-upx:$(PATH)
else ifneq ($(wildcard $(HOME)/bin/bin-upx/upx-stubtools-check-version),)
export PATH := $(HOME)/bin/bin-upx:$(PATH)
endif


# /***********************************************************************
# //
# ************************************************************************/

$(step 1)
ifndef STUBS
STUBS += arm64-linux.shlib-init.h
endif


ifndef default.targets
ifeq ($(wildcard .all-stamp),)
default.targets =
default:
    @echo "UPX info: type 'make all' if you have all the required build tools."
else
default.targets = all
default: $$(default.targets)
endif
endif


all.targets ?= .upx-stubtools-stamp tmp/.tmp-stamp .all-stamp
all: $$(all.targets)
.upx-stubtools-stamp: $(MAKEFILE_LIST)
    upx-stubtools-check-version 20160918
    $(step 4)
    @echo "timestamp" > $@
.DELETE_ON_ERROR: .upx-stubtools-stamp
%/.tmp-stamp:
    @mkdir -p $(dir $@)
    @echo "timestamp" > $@
.PRECIOUS: %/.tmp-stamp
.all-stamp: $$(STUBS)
    @echo "timestamp" > $@

ifeq ($(wildcard .all-stamp),)
mostlyclean clean: distclean
else
mostlyclean clean: maintainer-clean
endif
distclean:
    rm -f .*-stamp
    rm -rf tmp
maintainer-clean:
    rm -f .upx-stubtools-stamp
    rm -rf tmp
    rm -f $(STUBS)
list-stubs: $(STUBS)
#   @ls -l $(STUBS)
    @wc $(STUBS)

.PHONY: default all mostlyclean clean distclean maintainer-clean list-stubs


# util var for use in the rules - basename of the current target
override T = $(basename $(notdir $@))

# clear some vars, just in case
LABEL_PREFIX =
PP_FLAGS =
tc_bfdarch =
tc_bfdname =
tc_list =
tc_objdump_disasm_options =

# commands
ECHO_e     = /bin/echo -e
ECHO_E     = /bin/echo -E
PERL       = perl
PYTHON     = python
UNIX2DOS  := $(PERL) -i -pe 's/$$/\r/;'

# trim (strip) trailing whitespace
RTRIM     := sed -e 's/[ $(tab)]*$$//'
# squeeze duplicate blank lines, delete empty first & last line
BLSQUEEZE := $(RTRIM) | cat --squeeze-blank | sed -e '1{/^$$/d}' -e '$${/^$$/d}'
# delete blank lines
BLDEL     := $(RTRIM) | sed -e '/^$$/d'
# delete blank lines at top (beginning) of file
BLDELTOP  := sed -e '/./,$$!d'
# delete blank lines at bottom (end) of file
BLDELBOT  := sed -e ':a' -e '/^\n*$$/{$$d;N;ba' -e '}'


# /***********************************************************************
# // setup toolchain globals
# ************************************************************************/

# enumerate the names of all variables that will get tested (from basename and $(tc_list))
__tc_varlist   = tc.$(basename $(notdir $@)).$1 $(foreach v,$(tc_list),tc.$v.$1)
# return the name of the first variable that is not empty
__tc_varsearch = $(firstword $(foreach v,$1,$(if $($v),$v,)))
# error sentinel for missing commands
__tc_FALSE     = false tc_FALSE: '1:$1 2:$2 3:$3 4:$4 5:$5' '$@' '$<' '$(tc_list)'
# call (expand) the first variable that is not empty
  # [move the next comment line within the "tc" macro for debugging]
  # tc debug '1:$1 2:$2 3:$3 4:$4 5:$5' '$@' '$<' '$(tc_list)'
define tc
  $(call $(call __tc_varsearch,$(call __tc_varlist,$1) __tc_FALSE),$2,$3,$4,$5)
endef

# default tools
tc.default.bin2h      = $(PYTHON) $(top_srcdir)/src/stub/scripts/bin2h.py --ident=auto-stub
##tc.default.bin2h-c    = $(call tc,bin2h) --compress=14,15,0
tc.default.bin2h-c    = $(call tc,bin2h) --compress=0
tc.default.brandelf   = $(PYTHON) $(top_srcdir)/src/stub/scripts/brandelf.py $(if $(tc_bfdname),--bfdname=$(tc_bfdname))
tc.default.gpp_inc    = $(PYTHON) $(top_srcdir)/src/stub/scripts/gpp_inc.py
tc.default.gpp_mkdep  = $(PYTHON) $(top_srcdir)/src/stub/scripts/gpp_inc.py -o /dev/null

tc.default.sstrip     = sstrip-20060518
tc.default.xstrip     = $(PYTHON) $(top_srcdir)/src/stub/scripts/xstrip.py

# default multiarch-binutils
tc.default.m-ar       = aarch64-linux-android-ar
tc.default.m-ld       = aarch64-linux-android-ld $(if $(tc_bfdname),-b $(tc_bfdname))
tc.default.m-nm       = aarch64-linux-android-nm $(if $(tc_bfdname),--target=$(tc_bfdname))
tc.default.m-objcopy  = aarch64-linux-android-objcopy $(if $(tc_bfdname),-F $(tc_bfdname))
tc.default.m-objdump  = aarch64-linux-android-objdump $(if $(tc_bfdname),-b $(tc_bfdname)) $(if $(tc_bfdarch),-m $(tc_bfdarch))
tc.default.m-readelf  = aarch64-linux-android-readelf

# default binutils
tc.default.ld         = $(call tc,m-ld)
tc.default.nm         = $(call tc,m-nm)
tc.default.objcopy    = $(call tc,m-objcopy)
tc.default.objdump    = $(call tc,m-objdump)
tc.default.readelf    = $(call tc,m-readelf)

# default binutils functions
define tc.default.f-embed_objinfo
    chmod a-x $1
    $(call tc,objcopy) --strip-unneeded $1
    $(call tc,objcopy) -R .text -R .data -R .bss $1
    $(call tc,objcopy) -R .comment -R .note -R .note.GNU-stack -R .reginfo $1
    $(call tc,objdump) -Dr $(tc_objdump_disasm_options) $1 | $(RTRIM) > $1.disasm
    $(call tc,objdump) -htr -w $1 | $(BLSQUEEZE) | sed -e '1s/^.*: *file format/file format/' > $1.dump
    $(call tc,xstrip) --with-dump=$1.dump $1
    cat $1.dump >> $1
endef

tc.default.f-objstrip-disasm.bin = @true
tc.default.f-objstrip-disasm.o   = $(call tc,objdump) -dr $(tc_objdump_disasm_options) $1 | $(RTRIM) > $1.disasm
tc.default.f-objstrip-disasm.obj = $(call tc,objdump) -dr $(tc_objdump_disasm_options) $1 | $(RTRIM) > $1.disasm
define tc.default.f-objstrip
    chmod a-x $1
    $(call tc,objcopy) -R .comment -R .note -R .note.GNU-stack -R .reginfo $1
    $(call tc,f-objstrip-disasm$(suffix $1),$1)
endef

# some common arch settings
tc.arch-i086.gcc      = i386-linux-gcc-3.4.6 -m32 -march=i386 -nostdinc -MMD -MT $@
tc.arch-i086.wdis     = $(WATCOM)/binl/wdis
tc.arch-i386.gcc      = i386-linux-gcc-3.4.6 -m32 -march=i386 -nostdinc -MMD -MT $@
tc.arch-i386.djasm    = djasm-20060614




# /***********************************************************************
# // arm64-linux.shlib arm64        >> arm64-linux-objcopy-2.25     arm64-linux-objdump-2.25
# ************************************************************************/
arm64-linux.shlib%.h : tc_list = arm64-linux.elf default
arm64-linux.shlib%.h : tc_bfdname = elf64-littleaarch64
tc.arm64-linux.shlib-init.objcopy  = aarch64-linux-gnu-objcopy -F elf64-littleaarch64
tc.arm64-linux.shlib-init.objdump  = aarch64-linux-gnu-objdump

tc.arm64-linux.elf.gcc  = aarch64-linux-android-gcc

arm64-linux.shlib%.h : $(srcdir)/src/$$T.S
    $(call tc,gcc) -c -x assembler-with-cpp $< -o tmp/$T.bin
    $(call tc,f-embed_objinfo,tmp/$T.bin)
    $(call tc,bin2h-c) tmp/$T.bin $@


# /***********************************************************************
# // dependencies
# ************************************************************************/

ifneq ($(strip $(STUBS)),)
$(step 4)
# FIXME: we want a dependency-only prerequisite here
$(STUBS): tmp/.tmp-stamp $(MAKEFILE_LIST)
$(STUBS): $(top_srcdir)/src/stub/scripts/bin2h.py
$(STUBS): $(top_srcdir)/src/stub/scripts/xstrip.py
endif
-include tmp/*.d

ifneq ($(strip $(STUBS)),)
.DELETE_ON_ERROR: $(STUBS)
endif


# /***********************************************************************
# // extra-all
# // extra-clean
# ************************************************************************/

ifndef EXTRA_MAKEFILES
EXTRA_MAKEFILES :=
##ifneq ($(filter extra-%,$(MAKECMDGOALS)),)
EXTRA_MAKEFILES += $(sort $(wildcard src/arch/*/Makefile.extra))
EXTRA_MAKEFILES += $(sort $(wildcard src/arch/*/*/Makefile.extra))
EXTRA_MAKEFILES += $(sort $(wildcard src/arch/*/*/*/Makefile.extra))
####EXTRA_MAKEFILES += $(shell find src/arch -name Makefile.extra 2>/dev/null)
##endif
endif

ifneq ($(strip $(EXTRA_MAKEFILES)),)
EXTRA_MAKEFILES.targets :=
EXTRA_MAKEFILES.targets += $(addsuffix .~all,$(sort $(EXTRA_MAKEFILES)))
EXTRA_MAKEFILES.targets += $(addsuffix .~clean,$(sort $(EXTRA_MAKEFILES)))

$(EXTRA_MAKEFILES.targets): MAKEFLAGS += --no-print-directory
$(EXTRA_MAKEFILES.targets): $$(basename $$@)
    $(MAKE) -C $(dir $@) -f $(basename $(notdir $@)) $(subst .~,,$(suffix $@))

extra-all:   $$(filter %.~all,$$(EXTRA_MAKEFILES.targets))
extra-clean: $$(filter %.~clean,$$(EXTRA_MAKEFILES.targets))

.PHONY: extra-all extra-clean $(EXTRA_MAKEFILES.targets)
endif

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