The Linux Development Platform Configuring, Using, and ... - Classes

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CH08.fm Page 256 Monday, October 7, 2002 9:16 PM 256 Chapter 8 • Cross-Platform and Embedded Systems Development 8.5.3 Using Stubs with GNU Debugger Stubs are software routines that you can link with your program. Using a stub, you can connect the process created by the program to the GNU debugger from a remote target, eliminating the need for the gdbserver program. Stubs are different for different targets. The GNU debugger contains some stubs by default in the source code tree. For example, the i386-stub.c file can be used for targets that use Intel CPUs. However you have to customize your stub depending on the target. Some instructions are included in the example source code files for the stub. 8.5.4 Debugging the Debug Session If you are not successful in connecting to the target machine using GDB, you can get help from the remote debug mode of GNU debugger. After turning this mode ON, you will see a lot on information on your screen when gdb establishes or tries to establish connection to a remote target. This information shows packets sent and received by gdb. The following session shows that we set the baud rate to 9600 using the remotebaud command, turn the remote debug mode ON and then connect to the remote target on serial port /dev/ttyS0. [root@desktop /root]# gdb sum GNU gdb 5.1.1 Copyright 2002 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i686-pc-linux-gnu"... (gdb) break main Breakpoint 1 at 0x8048496: file sum.c, line 6. (gdb) set remotebaud 9600 (gdb) set debug remote 1 (gdb) target remote /dev/ttyS0 Remote debugging using /dev/ttyS0 Sending packet: $Hc-1#09...Ack Packet received: OK Sending packet: $qC#b4...Ack Packet received: Sending packet: $qOffsets#4b...Ack Packet received: Sending packet: $?#3f...Ack Packet received: T0508:30190040;05:00000000;04:f8fdffbf; Sending packet: $m40001930,8#62...Ack Packet received: 54e8520000005b89 Sending packet: $m40001930,7#61...Ack
CH08.fm Page 257 Monday, October 7, 2002 9:16 PM Connecting to Target 257 Packet received: 54e8520000005b 0x40001930 in ?? () Sending packet: $qSymbol::#5b...Ack Packet received: Packet qSymbol (symbol-lookup) is NOT supported (gdb) continue Continuing. Sending packet: $Z0,8048496,1#8a...Ack Packet received: Packet Z0 (software-breakpoint) is NOT supported Sending packet: $m8048496,1#41...Ack Packet received: 83 Sending packet: $X8048496,0:#65...Ack Packet received: binary downloading NOT supported by target Sending packet: $M8048496,1:cc#21...Ack Packet received: OK Sending packet: $m4000e060,1#89...Ack Packet received: 8b Sending packet: $M4000e060,1:cc#69...Ack Packet received: OK Sending packet: $Hc0#db...Ack Packet received: OK Sending packet: $c#63...Ack Packet received: T0508:97840408;05:a8fdffbf;04:90fdffbf; Sending packet: $Hg0#df...Ack Packet received: OK Sending packet: $g#67...Ack Packet received: f830114090840408384f1140ac40114090fdffbfa8fdffbfa0b60040fcfdff bf9784040886020000230000002b0000002b0000002b000000000000000000 00000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000 Sending packet: $P8=96840408#6c...Ack Packet received: Sending packet: $Gf830114090840408384f1140ac40114090fdffbfa8fdffbfa0b60040fcfd ffbf9684040886020000230000002b0000002b0000002b0000000000000000 00000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000
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