Re: [ECOS] Running hello.c on i386

[Teng Chee Wan Philip <tcheewan@dso.org.sg>]

I thought that I made a mistake with the header files and tried to change the
Makefile.  Yes, I made the hello application under the environment as the stub.

Thanks a lot for the helpful advice.  I will try it out.

Philip Teng

Quoting Bart Veer <bartv@redhat.com>:

> >>>>> "Philip" == Philip Teng <tcheewan@dso.org.sg> writes:
> 
>     Philip> I tried to make hello.c using the Makefile given in the
> /examples.
>     Philip> bash.exe-2.04$ make hello.o
>     Philip> i386-elf-gcc -c -o hello.o -g -Wall
>     Philip> -I//c/users/philip/ecos/stub1_install/include
> -ffunction-sections
>     Philip> -fdata-sections hello.c
>     Philip> hello.c:2: stdio.h: No such file or directory
>     Philip> make: *** [hello.o] Error 1
> 
>     Philip> I encountered some errors and I fixed it by adding one
>     Philip> more include path...
> 
>     Philip> bash.exe-2.04$ make hello.o
>     Philip> i386-elf-gcc -c -o hello.o -g -Wall
>     Philip> -I//c/users/philip/ecos/stub1_install/include -I/usr/include
> -ffunction-sections
>     Philip> -fdata-sections hello.c
>     Philip> bash.exe-2.04$
> 
>     Philip> The compilation was successful. The target I used is a
>     Philip> PIII machine, host is Windows NT. I started up the i386
>     Philip> target using the gdb stub floppy and run the following:
> 
> No, that is wrong. The header file /usr/include/stdio.h will be for
> use by cygwin applications, not eCos applications. I suspect that you
> are trying to re-use the same configuration for the boot floppy and
> for "hello world".
> 
> When targetting a PC, you are essentially building two different
> applications. The first application is the gdb stub for the boot
> floppy, and serves the same purpose as a ROM monitor on a conventional
> embedded target. The second application is the "hello world" program.
> The two applications run in very different environments, e.g. they
> need completely separate startup code, so you need two different
> configurations. 
> 
> First you need to create a configuration for building the gdb stub,
> build that, and install the resulting executable on a floppy. It looks
> like you have already done this. The requirements for the gdb stub are
> fairly simple, e.g. there is no need for a C library, so the C library
> does not get built and its header files do not get installed.
> 
> Now create a new configuration using the default template, i.e. a
> configuration suitable for ordinary applications. This will include
> the C library, so the <stdio.h> header file will get installed. The
> two configurations should live in completely separate directories.
> 
>     Philip> bash.exe-2.04$ i386-elf-gdb -nw hello.o
>     Philip> GNU gdb 5.0
>     Philip> Copyright 2000 Free Software Foundation, Inc.
>     Philip> GDB is free software, covered by the GNU General Public
> License, and you
>     Philip> are
>     Philip> welcome to change it and/or distribute copies of it under
> certain
>     Philip> conditions.
>     Philip> Type "show copying" to see the conditions.
>     Philip> There is absolutely no warranty for GDB.  Type "show
> warranty" for
>     Philip> details.
>     Philip> This GDB was configured as "--host=i686-pc-cygwin
> --target=i386-elf"...
>     Philip> (gdb) set remotebaud 38400
>     Philip> (gdb) target remote com1
>     Philip> Remote debugging using com1
>     Philip> 0x37dc in ?? ()
>     Philip> (gdb) continue
>     Philip> Continuing.
> 
>     Philip> Program received signal SIGTRAP, Trace/breakpoint trap.
>     Philip> 0x37dc in ?? ()
> 
>     Philip> Anyone has any idea why the program hit a stop?
> 
> Another mistake I am afraid. You are trying to debug hello.o, an
> intermediate object file. You must first link the object file with the
> appropriate libraries. This will give you an executable file a.out or
> hello or hello.exe, depending on exactly how you drive the tools,
> and it is this executable which can then be debugged with gdb.
> 
> Bart
>