gdb 遠端qemu arm除錯

把 c 編譯成 arm 指令的可執行檔案

/usr/bin/arm-linux-gnueabi-g++ hello.cpp 

cat hello.cpp 

#include void crash()
int main()

直接執行報錯，因為 host 是 linux x86

$ ./a.out 

-bash: ./a.out: cannot execute binary file

需要用 qemu-arm 來執行， 結果是期望的

qemu-arm -l  /usr/arm-linux-gnueabi/  a.out 

hello world

qemu: uncaught target signal 11 (segmentation fault) - core dumped

segmentation fault (core dumped)

進行遠端除錯（關鍵是增加 -g 引數，指定埠為1235) 

qemu-arm -g 1235

-l  /usr/arm-linux-gnueabi/  a.out 

執行用 linux-x86 的 gdb 並不能列印 symbol

(gdb) target remote :1235

remote debugging using :1235
(gdb) c
continuing.
program received signal sigsegv, segmentation fault.
0x00000000 in ?? ()
(gdb) bt
#0 0x00000000 in ?? ()
cannot access memory at address 0x0
(gdb) file /home/payne/hello/a.out
a program is being debugged already.
are you sure you want to change the file? (y or n) y
reading symbols from /home/payne/hello/a.out...(no debugging symbols found)...done.
(gdb) bt
#0 0x00000000 in ?? ()
cannot access memory at address 0x0
(gdb)

懷疑要使用 arm 的 gdb 

參見 編譯了 arm 的gdb, 執行後定位到 crash()

qemu-arm -l  /usr/arm-linux-gnueabi/  ./gdb 

(gdb) target remote :1235
remote debugging using :1235
warning: can not parse xml target description; xml support was disabled at compile time
0x40801c40 in ?? ()
(gdb) file /home/payne/hello/a.out
a program is being debugged already.
are you sure you want to change the file? (y or n) y
reading symbols from /home/payne/hello/a.out...(no debugging symbols found)...done.
(gdb) c
continuing.
program received signal sigsegv, segmentation fault.
0x0000841e in crash() ()
(gdb)

結論：

難道說 arm 的 gdbserver, 就只能用 arm 的 gdb？

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