Re: [patch/mips] Fix simple floating-point struct for eabi

[Michael Snyder <msnyder at cygnus dot com>]

Andrew Cagney wrote:
> 
> FYI,
> 
> The attatched fixes the case where GDB is calling an inferior function
> with a structure containing just a single floating point value.  The
> EABI likes to squeeze it into a floating-point register.

Hmmm, I'll have to look at this!  Sparc64 likes to do the same thing.

> 
>         Andrew
> 
>     ---------------------------------------------------------------
> Sun Jun 18 00:27:15 2000  Andrew Cagney  <cagney@b1.cygnus.com>
> 
>         * mips-tdep.c (mips_push_arguments): For MIPS_EABI, squeeze a
>         strut containing a floating-point into an FP register.
> 
> Index: mips-tdep.c
> ===================================================================
> RCS file: /cvs/src/src/gdb/mips-tdep.c,v
> retrieving revision 1.18
> diff -p -r1.18 mips-tdep.c
> *** mips-tdep.c 2000/06/17 05:42:50     1.18
> --- mips-tdep.c 2000/06/17 14:29:01
> *************** mips_push_arguments (nargs, args, sp, st
> *** 2143,2149 ****
>            don't use float registers for arguments.  This duplication of
>            arguments in general registers can't hurt non-MIPS16 functions
>            because those registers are normally skipped.  */
> !       if (typecode == TYPE_CODE_FLT
>           && float_argreg <= MIPS_LAST_FP_ARG_REGNUM
>           && MIPS_FPU_TYPE != MIPS_FPU_NONE)
>         {
> --- 2143,2156 ----
>            don't use float registers for arguments.  This duplication of
>            arguments in general registers can't hurt non-MIPS16 functions
>            because those registers are normally skipped.  */
> !       /* MIPS_EABI squeeses a struct that contains a single floating
> !          point value into an FP register instead of pusing it onto the
> !          stack. */
> !       if ((typecode == TYPE_CODE_FLT
> !          || (MIPS_EABI
> !              && (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION)
> !              && TYPE_NFIELDS (arg_type) == 1
> !              && TYPE_CODE (TYPE_FIELD_TYPE (arg_type, 0)) == TYPE_CODE_FLT))
>           && float_argreg <= MIPS_LAST_FP_ARG_REGNUM
>           && MIPS_FPU_TYPE != MIPS_FPU_NONE)
>         {