Re: [Gcl-devel] BFD related issues - belated reply.

[Camm Maguire]

Greetings!  Good to see you two are working on this!  For the sake of
time efficiency, I'll leave the bfd stuff to you guys and focus on the
fast-link problem myself.  Please let me know if you get stuck.

Take care, 

"Mike Thomas" <address@hidden> writes:

> Hi Aurelien
> 
> | Sure I'd like to help out.
> 
> Thanks for that.
> 
> |  I know about this
> | bfdtest.c file, which I happen to have used myself to
> | test BFD dynamic loading for Mac OS X.  Unfortunately,
> | I'm absolutely unacquainted to PE, which is probably
> | the object file format you're using.  What I'd do is
> | look at this in gdb to see what exactly is happening.
> | As I don't have access to any Windows machine running
> | cygwin or mingw (or whatever you're using), I can't
> | look into the matter myself.  Could you provide a
> | stack trace along with a generous context ?  Then, as
> | I've been working on BFD for quite some time now,
> | maybe I can come up with a solution.
> 
> Sounds good.
> 
> The example oputput I sent you yesterday used the standard MinGW32 libbfd
> etc.
> 
> I built bfdtest from the GCL CVS bfd build today and had a complete
> disaster - the exe_bfd structure gets trashed during bfd_openr() before the
> executable symbol table is even built. I'll try and get to the bottom of why
> it went so badly wrong before I bring you in on the debugging.
> 
> 
> | >From my experience, the code in bfdtest.c (and in
> | sfasfbfd.c) is fairly experimental, and heavily relies
> | on the behavior for ELF.  Is BFD reputedly working for
> | PE ?
> 
> MinGW32 and Cygwin each use it so, yes, but apparently not the parts we
> need.
> 
> 
> | I know that there's support for Windows DLL in
> | GNU ld, so I suspect there should be some kind of
> | minimal support for BFD as well.  Fixing the matter
> | might not be that much of a headache.
> 
> For you maybe!!
> 
> Cheers
> 
> Mike Thomas.
> 
> 
> $ gdb --directory binutils/bfd --directory binutils/libiberty/ ./bfdtest.exe
> GNU gdb 6.0
> Copyright 2003 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-mingw32"...
> (gdb) b bfd_init
> Breakpoint 1 at 0x407033: file init.c, line 50.
> (gdb) l
> 227
> 228             fprintf ( stderr, "mnotice\n");
> 229             return MY_BFD_FALSE;
> 230
> 231         }
> 232
> 233
> 234     int main ( int argc, char ** argv )
> 235     {
> 236         int init_address=-1;
> (gdb) set args ./unixport/raw_gcl.exe ./lsp/gcl_sloop.o
> (gdb) r
> Starting program: c:\cvs\head\gcl-bfd/./bfdtest.exe ./unixport/raw_gcl.exe
> ./lsp
> /gcl_sloop.o
> In BFD fast load test. Reloc_howto_type size 52
> BUILDING EXECUTABLE SYMBOL TABLE FOR ./unixport/raw_gcl.exe
> 
> Breakpoint 1, 0x00407033 in bfd_init () at init.c:50
> 50      {
> (gdb) n
> build_symbol_table_bfd (oname=0x3d2cbc "./unixport/raw_gcl.exe")
>     at bfdtest.c:21
> 21          if ( ! ( exe_bfd = bfd_openr ( oname, 0 ) ) ) {
> (gdb) n
> 26          if ( ! bfd_check_format ( exe_bfd, bfd_object ) ) {
> (gdb) n
> 31          if ( !(link_info.hash = bfd_link_hash_table_create (
> exe_bfd ) ) ) {
> 
> (gdb) p oname
> $1 = 0x3d2cbc "./unixport/raw_gcl.exe"
> (gdb) p exe_bfd
> $2 = (bfd *) 0x3d5058
> (gdb) p *exe_bfd
> $3 = {id = 4009148, filename = 0x41c990 "l?A", xvec = 0x77c5ace0,
>   iostream = 0x1, cacheable = 1, target_defaulted = 4018264,
>   lru_prev = 0x3d5058, lru_next = 0x9, where = 0, opened_once = 0,
>   mtime_set = 0, mtime = 0, ifd = 1, format = bfd_object, direction = 314,
>   flags = 0, origin = 0, output_has_begun = 4026664, section_htab = {
>     table = 0xfd3, size = 4230544, newfunc = 0x3d6100, memory = 0x3d613c},
>   sections = 0x3d6440, section_tail = 0x6, section_count = 4198400,
>   start_address = 11909, symcount = 0, outsymbols = 0x413cd0, dynsymcount =
> 0,
>   arch_info = 0x0, arelt_data = 0x0, my_archive = 0x0, next = 0x0,
>   archive_head = 0x0, has_armap = 0, link_next = 0x3d51f0, archive_pass = 0,
>   tdata = {aout_data = 0x3d2d50, aout_ar_data = 0x3d2d50,
>     oasys_obj_data = 0x3d2d50, oasys_ar_data = 0x3d2d50,
>     coff_obj_data = 0x3d2d50, pe_obj_data = 0x3d2d50,
>     xcoff_obj_data = 0x3d2d50, ecoff_obj_data = 0x3d2d50,
>     ieee_data = 0x3d2d50, ieee_ar_data = 0x3d2d50, srec_data = 0x3d2d50,
>     ihex_data = 0x3d2d50, tekhex_data = 0x3d2d50, elf_obj_data = 0x3d2d50,
>     nlm_obj_data = 0x3d2d50, bout_data = 0x3d2d50, mmo_data = 0x3d2d50,
>     sun_core_data = 0x3d2d50, sco5_core_data = 0x3d2d50,
>     trad_core_data = 0x3d2d50, som_data = 0x3d2d50, hpux_core_data =
> 0x3d2d50,
>     hppabsd_core_data = 0x3d2d50, sgi_core_data = 0x3d2d50,
>     lynx_core_data = 0x3d2d50, osf_core_data = 0x3d2d50,
>     cisco_core_data = 0x3d2d50, versados_data = 0x3d2d50,
>     netbsd_core_data = 0x3d2d50, mach_o_data = 0x3d2d50,
> ---Type <return> to continue, or q <return> to quit---
>     mach_o_fat_data = 0x3d2d50, pef_data = 0x3d2d50, pef_xlib_data =
> 0x3d2d50,
>     sym_data = 0x3d2d50, any = 0x3d2d50}, usrdata = 0xabababab,
>   memory = 0xabababab}
> (gdb) p _bfd_link_hash_table_create
> No symbol "_bfd_link_hash_table_create" in current context.
> (gdb) p exe_bfd->xvec
> $4 = (const struct bfd_target *) 0x77c5ace0
> (gdb) p exe_bfd->xvec->_bfd_link_hash_table_create
> $5 = (struct bfd_link_hash_table *(*)()) 0
> (gdb)
> 
> 
> 
> 
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> 
> 

-- 
Camm Maguire                                            address@hidden
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