soft fp emulation for m68k

• Date: Thu, 31 Oct 1996 13:44:04 -0600 (CST)
• From:
  "Joel Sherrill <joel@merlin.gcs.redstone.army.mil>" <joel@merlin.gcs.redstone.army.mil>
• Reply-To:
  "Joel Sherrill <joel@merlin.gcs.redstone.army.mil>" <joel@merlin.gcs.redstone.army.mil>
• Content-Type: TEXT/PLAIN; charset=US-ASCII

An rtems user has informed me that this library is not reentrant.  Is
there a way to save the state of this library so a context switch between
different tasks could perform this action?

A quick look at the output of nm for the msoft-float libgcc.a shows only 
a handful of symbols which I think have to be addressed.  Is the lb1sf68.asm
code considered volatile?  Here is the worst case list I think would have 
to be switched:

00000000 D __shtab
00000032 D __new_handler
0000006c D _fpCCR
0000006c d __exception_bits
0000006e d __trap_enable_bits
00000070 d __sticky_bits
00000072 d __rounding_mode
00000074 d __format
00000076 d __last_operation
00000078 d __operand1
00000080 d __operand2

If I remember everything right, some of these symbols don't even have to 
do with software FP.

Ideas, hints, suggestions appreciated.

--joel
Joel Sherrill                    Sr. Computer Scientist
joel@OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
   Support Available             (205) 722-9985

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