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From: "Dorel Zamfir" <dorel_z AT ics-iq DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: RHIDE debugger fails to start on board without floating point unit
Date: Wed, 20 Feb 2002 14:40:37 -0800
Organization: Intelligent Computer Solutions
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

I am trying to develop a program to run on a 486 based ELAN SC400 processor
that does not have a floating point unit.

Even when using a small test program that does not use any floating point
types and I try to step into the first line of code, the RHIDE debugger
displays this error message,
"Program has received signal: SIGFPE, Arithmetic exception".

The program runs just fine if I run it directly from the DOS prompt (outside
of RHIDE).  I have tried stepping into the first line using RHGDB, FSDB, and
GDB 5.0.  They all fail to start but GDB gives more descriptive info that I
am including below.

I am running plain MS-DOS 6.22.  I have 8 MB RAM installed.  I am using
DJGPP v2.03 and RHIDE v1.4.  I have tried
adding each of the floating point libraries (libemu.a and libwmemu) to my
project but it did not correct the issue.  I also tried setting the
following lines for each library but that did not have an effect either:
set 387=N
set emu387=c:\djgpp\bin\emu387.dxe (and emu387.dxe)

Results of go32-v2 are:
    DPMI memory available: 5411 Kb
    DPMI swap space available: 129821 Kb

Results of GDB are:
(starting to 'run' program gives)
    Program received signal SIGEMT, Emulation trap.
    0x59695 in _control87 ()
(trying to nexti gives)
    0x5969a in _control87 ()
(trying to nexti gives)
    Program received signal SIGSEGV, Segmentation fault.
    0x0 in ?? ()
(trying to nexti gives)
    Exiting due to signal SIGSEGV
    General Protection Fault at eip=00000000, error=0004
    eax=00000000 ebx=000671dc ecx=00000008 edx=00000004 esi=00000054
edi=0007827c
    ebp=000f8170 esp=000671e0 program=C:\DJGPP\SOLO2\SOLO2.EXE
    cs: sel=00e7  base=10390000  limit=000fffff
    ds: sel=00ef  base=10390000  limit=000fffff
    es: sel=00ef  base=10390000  limit=000fffff
    fs: sel=00ef  base=10390000  limit=000fffff
    gs: sel=00ff  base=00000000  limit=0010ffff
    ss: sel=00ef  base=10390000  limit=000fffff
    App stack: [000f827c..0007827c] Exceptn stack: [000781d0..00076290]

    Call frame traceback EIPs:
    0x00000000
    0x0004a4b1
    0x0004a180
    0x00049f0e
    0x00059013
    0x00059055
    0x0000037f
    0x0004a0ca
    0x000546ed

    Program exited with code 0377.

If anyone could explain to me what is happening and why I would greatly
appreciate it.  Any info on how to correct this issue or a work around would
be very useful as I am quite stuck at this point.

Thanks,

Dorel Zamfir