我的最终目标是为我的NAS编译rtorrent,这是一台Synology DS107 +。为了熟悉交叉编译,我想编译一个helloworld。对我来说这已经成了一个新手的障碍。
执行程序会导致分段错误。我使用gcc-arm-none-eabi在Ubuntu x84_64上编译它。
为目标编译程序需要哪些工具?我还咨询了"Cross compile from linux to ARM-ELF (ARM926EJ-S/MT7108)"并需要workaround,因为gcc抱怨没有声明_exit。
以下是更详细的信息:
的/ proc内/ cpuinfo
Processor : ARM926EJ-Sid(wb) rev 0 (v5l)
BogoMIPS : 499.71
Features : swp half thumb fastmult vfp edsp
CPU implementer : 0x41
CPU architecture: 5TEJ
CPU variant : 0x0
CPU part : 0x926
CPU revision : 0
Cache type : write-back
Cache clean : cp15 c7 ops
Cache lockdown : format C
Cache format : Harvard
I size : 32768
I assoc : 1
I line length : 32
I sets : 1024
D size : 32768
D assoc : 4
D line length : 32
D sets : 256
Hardware : MV-88fxx81
Revision : 0000
Serial : 0000000000000000
uname -a
Linux DiskStation 2.6.15 #1637 Sat May 4 05:59:19 CST 2013
armv5tejl GNU/Linux synology_88f5281_107+
dmesg (来自头部的片段似乎对我有用)
Linux version 2.6.15 (root@build2) (gcc version 3.4.3 (CSL 2005Q1B) (Marvell 2006Q3))
#1637 Sat May 4 05:59:19 CST 2013
CPU: ARM926EJ-Sid(wb) [41069260] revision 0 (ARMv5TEJ)
Machine: MV-88fxx81
...
Synology Hareware Version: DS107v20
Memory policy: ECC disabled, Data cache writeback
...
CPU0: D VIVT write-back cache
CPU0: I cache: 32768 bytes, associativity 1, 32 byte lines, 1024 sets
CPU0: D cache: 32768 bytes, associativity 4, 32 byte lines, 256 sets
readelf -h busybox (从设备中取出)
ELF Header:
Magic: 7f 45 4c 46 01 01 01 61 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: ARM
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x8de0
Start of program headers: 52 (bytes into file)
Start of section headers: 1319468 (bytes into file)
Flags: 0x602, has entry point, GNU EABI, software FP, VFP
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 3
Size of section headers: 40 (bytes)
Number of section headers: 20
Section header string table index: 19
编辑:命令行
我使用了选项-march=armv5te -mtune=arm926ej-s -mno-long-calls -msoft-float -static
。我还尝试通过 mcpu 取消 march oder替换 mtune 。如果没有 static ,则说找不到。还尝试了-mfpu=vfp
和Debian软件包的armel二进制文件。例如 busybox-static 在我的HTC Desire S(armv7l)上正常运行,也会导致段错误。
使用:
arm-linux-gnueabi-gcc
→细分错误arm-none-eabi-gcc
→分段错误(或非法指令,但很少,无法判断何时)我尝试的代码是:
# include <stdlib.h>
void _exit (int x) { while (1) {} } // only needed for arm-none-eabi-gcc
int main (int argc, char* argv[]) {
return 47;
}