On 04/19/2016 08:31 PM, Mark Hatle wrote:
On 4/19/16 2:33 AM, Hongxu Jia wrote:
Hi all,
With some investigation, there is an example to explain how to do remote debug.
Also file [YOCTO #9481] for document.
Hi Andreas,
Would you please have a look the example, to see if it could fit your case.
Example:
1. Build a image with gdbserver and gzip installed. The gzip
is the debug binary. Append the following to local.conf
...
IMAGE_INSTALL_append = " gdbserver gzip"
...
$ bitbake core-image-sato
2. Build gdb-cross for remote debug on host
$ bitbake gdb-cross-i586
3. start qemu
$ runqemu qemux86 core-image-sato
4. On host side, create symlink /usr/src/debug to
${BASE_WORKDIR}/${MULTIMACH_TARGET_SYS} which the
location of sources is /usr/src/debug.
$ ln -snf /TOPDIR/tmp/work/i586-poky-linux /usr/src/debug
This is incorrect. On the host you use the combination of:
(gdb) set sysroot <your debug capable fs path>
(gdb) set substitute-path /usr/src/debug <your debug capable fs
path>/usr/src/debug
Yes! Yours is more reasonable. It is verified on my case:
4. On host side, Set a substitution rule for finding source files.
Replace /usr/src/debug with ${BASE_WORKDIR}/${MULTIMACH_TARGET_SYS}
(gdb) set substitute-path /usr/src/debug /TOPDIR/tmp/work/i586-poky-linux
//Hongxu
5. On target side, ipaddr is 128.224.163.187,
run gdbserver to debug "gzip -h"
root@qemux86-64:~# gdbserver localhost:1024 gzip -h
Process gzip created; pid = 530
Listening on port 1024
6. On host side, enter gzip's devshell
$ bitbake -cdevshell gzip
7. On host side, run gdb-cross to remote debug gzip
gzip-1.6# i586-poky-linux-gdb ../build/gzip
8. Use path ${STAGING_DIR_HOST} as the system root for
the program being debugged. Any absolute shared
library paths will be prefixed with path;
(gdb) set sysroot /TOPDIR/tmp/sysroots/qemux86
9. Start remote target, set break point at help()
(gdb) target remote 128.224.163.187:1024
(gdb) break gzip.c:325
(gdb) info break
Num Type Disp Enb Address What
1 breakpoint keep y 0x0000000000401ec1 in main at
/usr/src/debug/gzip/1.6-r0/gzip-1.6/gzip.c:325
(gdb) c
Continuing.
Breakpoint 1, main (argc=2, argv=0x7fffffffeca8) at
/usr/src/debug/gzip/1.6-r0/gzip-1.6/gzip.c:465
465 help(); do_exit(OK); break;
(gdb) list
460 case 'd':
461 decompress = 1; break;
462 case 'f':
463 force++; break;
464 case 'h': case 'H':
465 help(); do_exit(OK); break;
466 case 'k':
467 keep = 1; break;
468 case 'l':
469 list = decompress = to_stdout = 1; break;
(gdb) c
Continuing.
[Inferior 1 (process 1246) exited normally]
10. On target side, get output of "gzip -h"
[snip]
Remote debugging from host 128.224.153.74
Usage: gzip [OPTION]... [FILE]...
Compress or uncompress FILEs (by default, compress FILES in-place).
Mandatory arguments to long options are mandatory for short options too.
-c, --stdout write on standard output, keep original files unchanged
-d, --decompress decompress
-f, --force force overwrite of output file and compress links
-h, --help give this help
-k, --keep keep (don't delete) input files
-l, --list list compressed file contents
-L, --license display software license
-n, --no-name do not save or restore the original name and time stamp
-N, --name save or restore the original name and time stamp
-q, --quiet suppress all warnings
-r, --recursive operate recursively on directories
-S, --suffix=SUF use suffix SUF on compressed files
-t, --test test compressed file integrity
-v, --verbose verbose mode
-V, --version display version number
-1, --fast compress faster
-9, --best compress better
With no FILE, or when FILE is -, read standard input.
Report bugs to <bug-g...@gnu.org>.
Child exited with status 0
GDBserver exiting
[snip]
//Hongxu
--
_______________________________________________
Openembedded-core mailing list
Openembedded-core@lists.openembedded.org
http://lists.openembedded.org/mailman/listinfo/openembedded-core
