GDB version: 5.2
Compilation:
compiler (version): gcc 2.95.3 (host and target)
procedure for gdb:
configure
make
cd gdb/gdbserver
export CC=/usr/arm-linux-uclibc/bin/gcc #(see www.uclibc.org)
rm *.cache
configure --build=i686-pc-linux
--target=arm-linux
--prefix=/usr/arm-linux-uclibc
make clean
make
procedure for debugged prog:
this program is a simple loop showing integers
from 0 to 9 compiled with same gcc
Platforms:
host: IBM compatible pc (i686-pc-linux-gnu)
target: ARM CS89712 processor
note:
Target has a strange word alignment. With the contents:
Adress: 4k+0 4k+1 4k+2 4k+3
Data: 0 1 2 3
reading an int from
4k+0 gives 03 02 01 00
4k+1 gives 00 03 02 01
4k+2 gives 01 00 03 02
4k+3 gives 02 01 00 03
Commands:
target:
gdbserver host_ip:123 test.arm
host
gdb test.arm
target remote target_ip:123
break main
continue
The error is:
Could not write to memory at ...
After a little debug I found that:
1. after 'continue' command
2. the host send some 'm' packets (read memory)
3. and then tries two times to write by sending 'M' packets
4. in gdbserver, linux-low.h, write_inferior_memory
5. a call to ptrace(PTRACE_POKETEXT,...) is made
6. and this call returns errno=5=EIO.
bye,
radu
PS: please reply.
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