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To: Andrew Cagney <ac131313@cygnus.com>
cc: Richard.Earnshaw@arm.com, gdb@sources.redhat.com
Reply-To: Richard.Earnshaw@arm.com
Organization: ARM Ltd.
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Subject: Re: ARM floating point regs regression 
In-reply-to: Your message of "Tue, 22 Jan 2002 12:26:28 EST."
             <3C4DA0C4.9060506@cygnus.com> 
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Date: Tue, 22 Jan 2002 09:30:00 -0000
From: Richard Earnshaw <rearnsha@arm.com>
X-SW-Source: 2002-01/txt/msg00244.txt.bz2

> Hmm, type->type_specific.floatformat shouldn't be NULL here.  Checking 
> gdbtypes.c:
> 
>    builtin_type_i387_ext =
>      init_type (TYPE_CODE_FLT, floatformat_i387_ext.totalsize / 8,
> 	       0, "builtin_type_i387_ext", NULL);
>    TYPE_FLOATFORMAT (builtin_type_i387_ext) = &floatformat_i387_ext;
> 
> which is good, but:
> 
>    builtin_type_arm_ext_littlebyte_bigword =
>      init_type (TYPE_CODE_FLT, 
> floatformat_arm_ext_littlebyte_bigword.totalsize / 8,
> 	       0, "builtin_type_arm_ext_littlebyte_bigword", NULL);
> 
> is bad.
> 
> I don't know how but almost all the lines initializing TYPE_FLOATFORMAT 
> were lost.
> 

Hmm, I think I understand why it is failing.

Although the FPA has an extended float format (which is used for stacking 
regs across function calls), this type isn't used for "long double".  So I 
suspect the initialization code in gdbtypes.c is not setting it up 
correctly for this case.

R.