[fpc-devel] mips-linux and mipsel-linux snapshots available

[Pierre Free Pascal]

  Hi Mark,

  do you use my patch for mips to
handle stack?
  Without it, the backtrace doesn't work...

 The bad thing is that I submitted it to gdb-patches,
but it was refused, I was told that $fp should be equal to 
$sp according to ABI...

  If you use a stock GDB, try to unpack a recent
GDB source tree, apply the one line patch below,
and recompile GDB.

  Can you tell us if the backtrace looks better after this?

  Pierre Muller

2012-06-11  Pierre Muller  <muller at ics.u-strasbg.fr>

        * mips-tdep.c (mpis32_scan_prologue): Fix value of frame_offset
        for ADDIU $s8,$sp,FrameSize.


Index: src/gdb/mips-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/mips-tdep.c,v
retrieving revision 1.556
diff -u -p -r1.556 mips-tdep.c
--- src/gdb/mips-tdep.c 6 Jun 2012 21:34:12 -0000       1.556
+++ src/gdb/mips-tdep.c 10 Jun 2012 23:43:44 -0000
@@ -3226,6 +3226,7 @@ restart:
                (this_frame, gdbarch_num_regs (gdbarch) + 30);

              alloca_adjust = (unsigned) (frame_addr - (sp + low_word));
+             frame_offset -= low_word;
              if (alloca_adjust > 0)
                {
                   /* FP > SP + frame_size.  This may be because of


> -----Message d'origine-----
> De : fpc-devel-bounces at lists.freepascal.org [mailto:fpc-devel-
> bounces at lists.freepascal.org] De la part de Mark Morgan Lloyd
> Envoyé : samedi 24 novembre 2012 13:45
> À : fpc-devel at lists.freepascal.org
> Objet : Re: [fpc-devel] mips-linux and mipsel-linux snapshots available
> 
> Mark Morgan Lloyd wrote:
> 
> > The previous version that I compiled is around r22655 and builds OK on
> > mipsel implemented by Qemu. I'm trying it for mips (big-endian)... I
> > might be some time.
> 
> Definite problem on a big-endian target:  fpc -i  is OK but  fpc -h
> fails with
> 
> Reading symbols from /usr/local/bin/ppcmips...done.
> (gdb) set arg -h
> (gdb) run
> Starting program: /usr/local/bin/ppcmips -h
> 
> Program received signal SIGBUS, Bus error.
> 0x0043eb88 in SYSUTILS_$$_UNIXTOWINAGE$LONGINT$$LONGINT ()
> (gdb) bt
> #0  0x0043eb88 in SYSUTILS_$$_UNIXTOWINAGE$LONGINT$$LONGINT ()
> #1  0x0043fa6c in
> SYSUTILS_$$_FINDGETFILEINFO$ANSISTRING$TSEARCHREC$$BOOLEAN ()
> #2  0x0043fdc4 in SYSUTILS_$$_FINDNEXT$TSEARCHREC$$LONGINT ()
> Backtrace stopped: previous frame inner to this frame (corrupt stack?)
> (gdb)
> 
> Same failure running  fpc -l  or trying to compile a trivial program.
> Ditto  fpc -l- test.pas, or running with no options/parameters other
> than what are in the standard fpc.cfg.
> 
> --
> Mark Morgan Lloyd
> markMLl .AT. telemetry.co .DOT. uk
> 
> [Opinions above are the author's, not those of his employers or
colleagues]
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