arm-linux-gnueabihf-gcc
arm-linux-gnueabihf-ld
arm-linux-gnueabihf-objcopy
arm-linux-gnueabihf-objdump
1.arm-linux-gnueabihf-gcc
简介：编译文件用
作用：具体使用中使用 -g -c (编译文件.s) -o (可执行文件.o)
-g：为使用GDB进行调试
-c：编译源文件但不进行链接
-o：指定编译产生的文件
```bash
-pass-exit-codes Exit with highest error code from a phase
--help Display this information
--target-help Display target specific command line options
--help={common|optimizers|params|target|warnings|[^]{joined|separate|undocumented}}[,...]
Display specific types of command line options
(Use '-v --help' to display command line options of sub-processes)
--version Display compiler version information
-dumpspecs Display all of the built in spec strings
-dumpversion Display the version of the compiler
-dumpmachine Display the compiler's target processor
-print-search-dirs Display the directories in the compiler's search path
-print-libgcc-file-name Display the name of the compiler's companion library
-print-file-name=<lib> Display the full path to library <lib>
-print-prog-name=<prog> Display the full path to compiler component <prog>
-print-multiarch Display the target's normalized GNU triplet, used as
a component in the library path
-print-multi-directory Display the root directory for versions of libgcc
-print-multi-lib Display the mapping between command line options and
multiple library search directories
-print-multi-os-directory Display the relative path to OS libraries
-print-sysroot Display the target libraries directory
-print-sysroot-headers-suffix Display the sysroot suffix used to find headers
-Wa,<options> Pass comma-separated <options> on to the assembler
-Wp,<options> Pass comma-separated <options> on to the preprocessor
-Wl,<options> Pass comma-separated <options> on to the linker
-Xassembler <arg> Pass <arg> on to the assembler
-Xpreprocessor <arg> Pass <arg> on to the preprocessor
-Xlinker <arg> Pass <arg> on to the linker
-save-temps Do not delete intermediate files
-save-temps=<arg> Do not delete intermediate files
-no-canonical-prefixes Do not canonicalize paths when building relative
prefixes to other gcc components
-pipe Use pipes rather than intermediate files
-time Time the execution of each subprocess
-specs=<file> Override built-in specs with the contents of <file>
-std=<standard> Assume that the input sources are for <standard>
--sysroot=<directory> Use <directory> as the root directory for headers
and libraries
-B <directory> Add <directory> to the compiler's search paths
-v Display the programs invoked by the compiler
-### Like -v but options quoted and commands not executed
-E Preprocess only; do not compile, assemble or link
-S Compile only; do not assemble or link
-c Compile and assemble, but do not link
-o <file> Place the output into <file>
-pie Create a position independent executable
-shared Create a shared library
-x <language> Specify the language of the following input files
Permissible languages include: c c++ assembler none
'none' means revert to the default behavior of
guessing the language based on the file's extension
参考写法：
arm-linux-gnueabihf-gcc -g -c led.s -o led.o
使用指令前：
使用指令后：
2.arm-linux-gnueabihf-ld
简介：链接文件用
作用：将生成的.o类文件链接到一个指定的链接地址
-Ttext （地址）：指定链接地址，后期可以编写.lds链接
-o：选择指定生成的.elf文件名
-a KEYWORD Shared library control for HP/UX compatibility
-A ARCH, --architecture ARCH
Set architecture
-b TARGET, --format TARGET Specify target for following input files
-c FILE, --mri-script FILE Read MRI format linker script
-d, -dc, -dp Force common symbols to be defined
-e ADDRESS, --entry ADDRESS Set start address
-E, --export-dynamic Export all dynamic symbols
--no-export-dynamic Undo the effect of --export-dynamic
-EB Link big-endian objects
-EL Link little-endian objects
-f SHLIB, --auxiliary SHLIB Auxiliary filter for shared object symbol table
-F SHLIB, --filter SHLIB Filter for shared object symbol table
-g Ignored
-G SIZE, --gpsize SIZE Small data size (if no size, same as --shared)
-h FILENAME, -soname FILENAME
Set internal name of shared library
-I PROGRAM, --dynamic-linker PROGRAM
Set PROGRAM as the dynamic linker to use
-l LIBNAME, --library LIBNAME
Search for library LIBNAME
-L DIRECTORY, --library-path DIRECTORY
Add DIRECTORY to library search path
--sysroot=<DIRECTORY> Override the default sysroot location
-m EMULATION Set emulation
-M, --print-map Print map file on standard output
-n, --nmagic Do not page align data
-N, --omagic Do not page align data, do not make text readonly
--no-omagic Page align data, make text readonly
-o FILE, --output FILE Set output file name
-O Optimize output file
-plugin PLUGIN Load named plugin
-plugin-opt ARG Send arg to last-loaded plugin
-flto Ignored for GCC LTO option compatibility
-flto-partition= Ignored for GCC LTO option compatibility
-fuse-ld= Ignored for GCC linker option compatibility
-Qy Ignored for SVR4 compatibility
-q, --emit-relocs Generate relocations in final output
-r, -i, --relocatable Generate relocatable output
-R FILE, --just-symbols FILE
Just link symbols (if directory, same as --rpath)
-s, --strip-all Strip all symbols
-S, --strip-debug Strip debugging symbols
--strip-discarded Strip symbols in discarded sections
--no-strip-discarded Do not strip symbols in discarded sections
-t, --trace Trace file opens
-T FILE, --script FILE Read linker script
--default-script FILE, -dT Read default linker script
-u SYMBOL, --undefined SYMBOL
Start with undefined reference to SYMBOL
--unique [=SECTION] Don't merge input [SECTION | orphan] sections
-Ur Build global constructor/destructor tables
-v, --version Print version information
-V Print version and emulation information
-x, --discard-all Discard all local symbols
-X, --discard-locals Discard temporary local symbols (default)
--discard-none Don't discard any local symbols
-y SYMBOL, --trace-symbol SYMBOL
Trace mentions of SYMBOL
-Y PATH Default search path for Solaris compatibility
-(, --start-group Start a group
-), --end-group End a group
..............
参考写法：
arm-linux-gnueabihf-ld -Ttext 0x87800000 led.o -o led.elf
使用指令前：
使用指令后：
PS：本次使用的开发板IMX6ULL存储的地址为外部的DDR起始地址为0X80000000，但因为后期的开发需要都写到0x87800000
（内部的RAM地址为0x900000~0x91FFFF）
3.arm-linux-gnueabihf-objcopy
简介：格式转换工具
作用：将.elf文件转换为.bin文件
-O binary：-O表示输出的格式命令 binary为输出二级制
-S：不要复制源文件中的重定位信息和符号信息
-g：不复制源文件中的调试信息
-I --input-target <bfdname> Assume input file is in format <bfdname>
-O --output-target <bfdname> Create an output file in format <bfdname>
-B --binary-architecture <arch> Set output arch, when input is arch-less
-F --target <bfdname> Set both input and output format to <bfdname>
--debugging Convert debugging information, if possible
-p --preserve-dates Copy modified/access timestamps to the output
-D --enable-deterministic-archives
Produce deterministic output when stripping archives
-U --disable-deterministic-archives
Disable -D behavior (default)
-j --only-section <name> Only copy section <name> into the output
--add-gnu-debuglink=<file> Add section .gnu_debuglink linking to <file>
-R --remove-section <name> Remove section <name> from the output
-S --strip-all Remove all symbol and relocation information
-g --strip-debug Remove all debugging symbols & sections
--strip-dwo Remove all DWO sections
--strip-unneeded Remove all symbols not needed by relocations
-N --strip-symbol <name> Do not copy symbol <name>
--strip-unneeded-symbol <name>
Do not copy symbol <name> unless needed by
relocations
--only-keep-debug Strip everything but the debug information
--extract-dwo Copy only DWO sections
--extract-symbol Remove section contents but keep symbols
-K --keep-symbol <name> Do not strip symbol <name>
--keep-file-symbols Do not strip file symbol(s)
--localize-hidden Turn all ELF hidden symbols into locals
-L --localize-symbol <name> Force symbol <name> to be marked as a local
--globalize-symbol <name> Force symbol <name> to be marked as a global
-G --keep-global-symbol <name> Localize all symbols except <name>
-W --weaken-symbol <name> Force symbol <name> to be marked as a weak
--weaken Force all global symbols to be marked as weak
-w --wildcard Permit wildcard in symbol comparison
-x --discard-all Remove all non-global symbols
-X --discard-locals Remove any compiler-generated symbols
参考写法：
arm-linux-gnueabihf-objcopy -O binary -S -g led.elf led.bin
使用指令前：
使用指令后：
4.arm-linux-gnueabihf-objdump
简介：elf反汇编
作用：反汇编.elf到.dis
-D ：反汇编全部的段落
-a --archive-headers Display archive header information
-f --file-headers Display the contents of the overall file header
-p --private-headers Display object format specific file header contents
-P --private=OPT,OPT... Display object format specific contents
-h --[section-]headers Display the contents of the section headers
-x --all-headers Display the contents of all headers
-d --disassemble Display assembler contents of executable sections
-D --disassemble-all Display assembler contents of all sections
-S --source Intermix source code with disassembly
-s --full-contents Display the full contents of all sections requested
-g --debugging Display debug information in object file
-e --debugging-tags Display debug information using ctags style
-G --stabs Display (in raw form) any STABS info in the file
-W[lLiaprmfFsoRt] or
--dwarf[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,
=frames-interp,=str,=loc,=Ranges,=pubtypes,
=gdb_index,=trace_info,=trace_abbrev,=trace_aranges,
=addr,=cu_index]
Display DWARF info in the file
-t, --syms Display the contents of the symbol table(s)
-T, --dynamic-syms Display the contents of the dynamic symbol table
-r, --reloc Display the relocation entries in the file
-R, --dynamic-reloc Display the dynamic relocation entries in the file
@<file> Read options from <file>
-v, --version Display this program's version number
-i, --info List object formats and architectures supported
-H, --help Display this information
参考写法：
arm-linux-gnueabihf-objdump -D led.elf > led.dis
使用指令前：
使用指令后：
