>> The official definition is called the "ARM Procedure Calling Standard"
>> (APCS).
>
>It is available from ARM-Limited's web-site at :
>
>http://www.arm.com/armwww.ns4/img/12-Technical+Specs-ARM+Thumb+Procedure+Call+
>Standard+PDF/$File/ATPCSA05.pdf?OpenElement
That's the ATPCS, not the APCS. ATPCS is a newer standard incorporating
elements from APCS, elements from TPCS and some new stuff. GCC, and hence
GNU/Linux, doesn't yet implement all of ATPCS, so you need to exercise some
care if you use it as a reference.
>Does anybody know what R11 is used for if -fomit-frame-pointer is specified ?
Nothing. Recent versions of GCC will use it as just another callee-save
register in this situation but it looks like your compiler is too old for that.
You could try GCC 3.0.
p.
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