Re: crt0.S debug

[Mark Yang <markarmlinux at yahoo dot com>]

thanks for the answer! I did a "patch p0<sysarm.patch"
in my /newlib/libc/sys/arm/ directory, then looks like
it does the patch.
but I start my gdb, I still couldn't find the crt0.S
file in my gdb, I tried "directory
/newlib/libc/sys/arm/ " then I did:
gdb) jump *0x0
Error: No source file has been specified.

then I don't know what to do next, my crt0.S code
actually starts from 0x0, and I am using insight, but
I still couldn't see my crt0.S file but while my other
newlib files (memset.c maloc.c...) can be seen.

Any sugestion is appreciated!!!
Mark





--- "J. Johnston" <jjohnstn@redhat.com> wrote:
> Mark Yang wrote:
> > 
> > Hi,
> >    Anyone knows how I could change the newlib
> makefile
> > so I can debug crt0.S using GDB? I know there is
> some
> > place I could add a "-g" for adding debug symbols,
> I
> > just don't know where it is, I am compiling the
> gdb
> > for my arm7 board.
> >     Appreciate your help!
> > Mark
> > 
> 
> The problem is that the assembler needs to use the
> --gdwarf2 or
> --gstabs options to generate debug symbol
> information.  The code
> is compiled with the -g option but the gcc compiler
> does not translate
> this into an appropriate assembler option when
> compiling a .S file.
> It would be nice if the gcc compiler would do this,
> but this is not
> an issue for this forum.
> 
> Try the attached patch which overrides the rule for
> .S.o and adds the -Wa,--gdwarf2 option.
> 
> In the debugger, you may have to use the "directory"
> command to specify
> where the crt0.S source directory is.
> 
> -- Jeff J.> Index: Makefile.am
>
===================================================================
> RCS file:
> /cvs/src/src/newlib/libc/sys/arm/Makefile.am,v
> retrieving revision 1.2
> diff -u -r1.2 Makefile.am
> --- Makefile.am 12 Mar 2002 21:25:12 -0000 1.2
> +++ Makefile.am 14 Aug 2002 18:31:57 -0000
> @@ -10,5 +10,10 @@
>  
>  all: crt0.o
>  
> +ASFLAGS_FOR_TARGET = -Wa,-gdwarf2
> +
> +.S.o:
> + $(COMPILE) $(ASFLAGS_FOR_TARGET) -c $<
> +
>  ACLOCAL_AMFLAGS = -I ../../..
>  CONFIG_STATUS_DEPENDENCIES =
> $(newlib_basedir)/configure.host
> Index: Makefile.in
>
===================================================================
> RCS file:
> /cvs/src/src/newlib/libc/sys/arm/Makefile.in,v
> retrieving revision 1.6
> diff -u -r1.6 Makefile.in
> --- Makefile.in 4 Jul 2002 19:57:44 -0000 1.6
> +++ Makefile.in 14 Aug 2002 18:31:57 -0000
> @@ -91,6 +91,8 @@
>  
>  lib_a_SOURCES = access.c syscalls.c libcfunc.c
> trap.S setjmp.S
>  
> +ASFLAGS_FOR_TARGET = -Wa,-gdwarf2
> +
>  ACLOCAL_AMFLAGS = -I ../../..
>  CONFIG_STATUS_DEPENDENCIES =
> $(newlib_basedir)/configure.host
>  ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
> @@ -153,9 +155,6 @@
>  .s.o:
>   $(COMPILE) -c $<
>  
> -.S.o:
> - $(COMPILE) -c $<
> -
>  mostlyclean-compile:
>   -rm -f *.o core *.core
>  
> @@ -323,6 +322,9 @@
>  
>  
>  all: crt0.o
> +
> +.S.o:
> + $(COMPILE) $(ASFLAGS_FOR_TARGET) -c $<
>  
>  # Tell versions [3.59,3.63) of GNU make to not
> export all variables.
>  # Otherwise a system limit (for SysV at least) may
> be exceeded.
> 

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