Thanks for the answer. I go deeper in my thought so that maybe you can give me more infos about how I have to investagte about gcc/gdb
We are developers of embedded software on board designed and build by us; Generally we use 16 bit cisc and 32 bits risc cpu (Renesas h8/h8s; sh 2 / 3 ). We write applications for automotive enviroment mainly. We write the code using c/c++ and we compile using gcc. Because of we do not have much memory (ram and flash) we develop in the following way: each software we write has the same communication protocol running on RS232 or over TCP/IP and we have a simple monitoring progarm able to show the contents of the memory addresses in some format (char, int, long, signed unsigned, strings, ecc). Generally we declare a global variable, we write a debug value into it and during the run time we read at the right moment the content of such a variable. Good. For avoiding to read by hand .map file produced by ld, I developed a flex / bison simple analizer able to extract from .map file the address of a symbol. So into my tool I load the .map file and I write the name of the variable and I can read the content of it. This way of working becomes very hard if I use struct and union in c and classes in c++; I should know the offeset of each field of the struct so addind it to the base address known from the .map file, for each istance of such a struct I coud write "mysrtuct.myfield" into my tool, and, calculating the rigth address, my protocol could ask the target to read/write the content at that address. I prefer to avoid -g option because of my memory is never enough; but a good compromise cound be if I could compile the debug infos into sections I could remove after used by gdb for giving me the informations about the offset of each field. Is it possible? Where can I read more about to use gdb for embedded development with very poor uControllers? Thanks Alle 21:28, sabato 3 marzo 2007, Dave Korn ha scritto: > On 03 March 2007 20:15, Fabio Giovagnini wrote: > > Hi all, > > I'd like to develop a tool able to do the following things: > > 1) to load all the .h and .c/.cpp files; > > 2) to analyze allo the data struct / unions and classes; > > 3) to give me for each data member of a struct or union and for each data > > member of a class, the offset in bytes related to the base addess of a > > generic istance of the struct/union and class. > > > > In this way I could easily calculate the real address of each data member > > of each global declared struct / union and classes, and I clould easily > > read usign a simple communication protocol the content of a memory > > location of an embedded system only knowing the map file and the offset > > of each member of each global variable. > > Sounds like what you really want is a debugger... GDB does things like > that. The information you want is all emitted by the compiler as debug info > in your object files when you use the -g flag. You haven't given details > about the task you're trying to achieve but scripting gdb is probably going > to be the way to go. > > cheers, > DaveK -- Fabio Giovagnini Aurion s.r.l. via degli orti 11, 40050 Funo di Argelato (BO) Tel. +39.335.8350919 Fax +39.051.8659009 www.aurion-tech.com account telefono VoIP skype (www.skype.com): aurion.giovagnini
