Problem about reading/writing registers to let gdb support WDB agent on i386-vxw

[WANG KING]

Hi,
 Recently I want to let gdb5.0 debug the application on i386-vxworks 
target platform,with gdb communicating with vxworks's wdb agent.Now I have 
a patch "gdb-5.0-wdbpatch-1.1" for gdb5.0,which support powerpc-vxworks 
with wdb agent,Please read details at 
http://www.slac.stanford.edu/~strauman/gdb/index.html.After I imitate the 
file remote-vxppc.c's read/write register functions ,by adding a file 
remote-vxi386.c,I can generate gdb5.0 for i386-wrs-vxworks.I have read 
pc,esp,ebp registers.But I think I don't know whether the read/write 
register functions are right.Gdb export the error like this:
(vxgdb) run myproc
Starting program: D:/cygwin/tillRdb_1_0/test.o myproc
Allocating 0x4e20 bytes of stack on target
Using priority 100
Task options 0x0
Segmentation fault (core dumped)
   I don't know how to resolve it.Can you give me some idea about which 
register should be read/write when implementing the file remote-vxi386.c? 
Or tell me where to find gdb source code's program structure?

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