在iPhone4s iOS6.1.3上使用GDB调试，碰到如下问题
GNU gdb 6.3.50-20050815 (Apple version gdb-1708 + reverse.put.as patches v0.4) (Mon Apr 16 00:53:47 UTC 2012)
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This GDB was configured as "arm-apple-darwin".
gdb$ attach 11609
Attaching to process 11609.
Reading symbols for shared libraries . done
bfd_mach_o_scan: unknown architecture 0x0/0xb
bfd_mach_o_scan: unknown architecture 0x100000c/0x0
bfd_mach_o_scan: unknown architecture 0x100000c/0x0
bfd_mach_o_scan: unknown architecture 0x100000c/0x0
bfd_mach_o_scan: unknown architecture 0x100000c/0x0
bfd_mach_o_scan: unknown architecture 0x100000c/0x0
Reading symbols for shared libraries ......................bfd_mach_o_scan_read_symtab_symbol: unable to read 12 bytes at 124984
........................................................................................................................................................... done
bfd_mach_o_scan: unknown architecture 0x0/0xb
bfd_mach_o_scan: unknown architecture 0x100000c/0x0
bfd_mach_o_scan: unknown architecture 0x100000c/0x0
bfd_mach_o_scan: unknown architecture 0x100000c/0x0
bfd_mach_o_scan: unknown architecture 0x100000c/0x0
bfd_mach_o_scan: unknown architecture 0x100000c/0x0
Reading symbols for shared libraries + done
0x3a6b6eb4 in mach_msg_trap ()
Error while running hook_stop:
No symbol table is loaded. Use the "file" command.
虽然attach成功，但是无法识别函数名，只能在内存地址处下断点，而且由于无法识别architecture，调试的时候会按照ARM的4字节命令执行，而APP是Thumb指令，混合2字节和4字节指令的，单步的时候显示的汇编指令就是错误的。
希望各位能给出解决方法，先谢谢了~