1.环境介绍
开发板：荔枝派
交叉编译器：arm-linux-gnueabihf-
内核版本：linux-4.14-y
2.问题分析
执行交叉编译，生成的文件在班子内显示
# ./mygpio -sh: ./mygpio: not found
(1).一般可能是没有执行权限
(2).缺少库文件
3.解决办法
我的问题可能是2。所以
zqh@linux:~/lichee/Driver learn/LED$ arm-linux-gnueabihf-readelf -e mygpio ELF Header: Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 Class: ELF32 Data: 2's complement, little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: EXEC (Executable file) Machine: ARM Version: 0x1 Entry point address: 0x10434 Start of program headers: 52 (bytes into file) Start of section headers: 15048 (bytes into file) Flags: 0x5000200, Version5 EABI, soft-float ABI Size of this header: 52 (bytes) Size of program headers: 32 (bytes) Number of program headers: 9 Size of section headers: 40 (bytes) Number of section headers: 36 Section header string table index: 33 Section Headers: [Nr] Name Type Addr Off Size ES Flg Lk Inf Al [ 0] NULL 00000000 000000 000000 00 0 0 0 [ 1] .interp PROGBITS 00010154 000154 000013 00 A 0 0 1 [ 2] .note.ABI-tag NOTE 00010168 000168 000020 00 A 0 0 4 [ 3] .note.gnu.build-i NOTE 00010188 000188 000024 00 A 0 0 4 [ 4] .gnu.hash GNU_HASH 000101ac 0001ac 000048 04 A 5 0 4 [ 5] .dynsym DYNSYM 000101f4 0001f4 0000b0 10 A 6 1 4 [ 6] .dynstr STRTAB 000102a4 0002a4 000067 00 A 0 0 1 [ 7] .gnu.version VERSYM 0001030c 00030c 000016 02 A 5 0 2 [ 8] .gnu.version_r VERNEED 00010324 000324 000020 00 A 6 1 4 [ 9] .rel.dyn REL 00010344 000344 000008 08 A 5 0 4 [10] .rel.plt REL 0001034c 00034c 000050 08 AI 5 22 4 [11] .init PROGBITS 0001039c 00039c 00000c 00 AX 0 0 4 [12] .plt PROGBITS 000103a8 0003a8 00008c 04 AX 0 0 4 [13] .text PROGBITS 00010434 000434 00057c 00 AX 0 0 4 [14] .fini PROGBITS 000109b0 0009b0 000008 00 AX 0 0 4 [15] .rodata PROGBITS 000109b8 0009b8 000083 00 A 0 0 4 [16] .ARM.exidx ARM_EXIDX 00010a3c 000a3c 000008 00 AL 13 0 4 [17] .eh_frame PROGBITS 00010a44 000a44 000004 00 A 0 0 4 [18] .init_array INIT_ARRAY 00020f0c 000f0c 000004 00 WA 0 0 4 [19] .fini_array FINI_ARRAY 00020f10 000f10 000004 00 WA 0 0 4 [20] .jcr PROGBITS 00020f14 000f14 000004 00 WA 0 0 4 [21] .dynamic DYNAMIC 00020f18 000f18 0000e8 08 WA 6 0 4 [22] .got PROGBITS 00021000 001000 000038 04 WA 0 0 4 [23] .data PROGBITS 00021038 001038 000008 00 WA 0 0 4 [24] .bss NOBITS 00021040 001040 00000c 00 WA 0 0 4 [25] .comment PROGBITS 00000000 001040 00003b 01 MS 0 0 1 [26] .ARM.attributes ARM_ATTRIBUTES 00000000 00107b 00002a 00 0 0 1 [27] .debug_aranges PROGBITS 00000000 0010a5 000040 00 0 0 1 [28] .debug_info PROGBITS 00000000 0010e5 00089b 00 0 0 1 [29] .debug_abbrev PROGBITS 00000000 001980 0001a2 00 0 0 1 [30] .debug_line PROGBITS 00000000 001b22 0000ee 00 0 0 1 [31] .debug_frame PROGBITS 00000000 001c10 00009c 00 0 0 4 [32] .debug_str PROGBITS 00000000 001cac 001040 01 MS 0 0 1 [33] .shstrtab STRTAB 00000000 003970 000157 00 0 0 1 [34] .symtab SYMTAB 00000000 002cec 000890 10 35 101 4 [35] .strtab STRTAB 00000000 00357c 0003f4 00 0 0 1 Key to Flags: W (write), A (alloc), X (execute), M (merge), S (strings) I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown) O (extra OS processing required) o (OS specific), p (processor specific) Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align EXIDX 0x000a3c 0x00010a3c 0x00010a3c 0x00008 0x00008 R 0x4 PHDR 0x000034 0x00010034 0x00010034 0x00120 0x00120 R E 0x4 INTERP 0x000154 0x00010154 0x00010154 0x00013 0x00013 R 0x1 [Requesting program interpreter: /lib/ld-linux.so.3] LOAD 0x000000 0x00010000 0x00010000 0x00a48 0x00a48 R E 0x10000 LOAD 0x000f0c 0x00020f0c 0x00020f0c 0x00134 0x00140 RW 0x10000 DYNAMIC 0x000f18 0x00020f18 0x00020f18 0x000e8 0x000e8 RW 0x4 NOTE 0x000168 0x00010168 0x00010168 0x00044 0x00044 R 0x4 GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0x10 GNU_RELRO 0x000f0c 0x00020f0c 0x00020f0c 0x000f4 0x000f4 R 0x1 Section to Segment mapping: Segment Sections... 00 .ARM.exidx 01 02 .interp 03 .interp .note.ABI-tag .note.gnu.build-id .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rel.dyn .rel.plt .init .plt .text .fini .rodata .ARM.exidx .eh_frame 04 .init_array .fini_array .jcr .dynamic .got .data .bss 05 .dynamic 06 .note.ABI-tag .note.gnu.build-id 07 08 .init_array .fini_array .jcr .dynamic
看到我高亮的那一行：
[Requesting program interpreter: /lib/ld-linux.so.3]
接着我去板子里面找。发现并没有。所以我尝试将其拷贝到开发板的/lib/下。
接下来
./mygpio: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory
看来还缺少一个库。然后我把这个库放到板子里之后我的文件系统就坏掉了。。。
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1.发现问题
原来是Makefile的问题，我重新写了makefile
TARGET = myGPIO #可执行文件名称 ########################编译参数############################ CC = arm-linux-gnueabihf-gcc CXX = arm-linux-gnueabihf-g++ DEFINES = CFLAGS = -pipe -g -Wall -W -fPIE $(DEFINES) CXXFLAGS = -pipe -g -Wall -W -fPIE $(DEFINES) INCPATH = -I. ########################编译文件############################ SOURCES = ./main.c ./gpio.c OBJECTS = main.o gpio.o $(TARGET) : $(OBJECTS) $(CC) -o $(TARGET) $(OBJECTS) main.o : main.c gpio.h $(CC) $(include) $(CFLAGS) -c main.c gpio.o : gpio.c gpio.h $(CC) $(include) $(CFLAGS) -c gpio.c clean : rm $(TARGET) $(OBJECTS)
这样make就ok了。