[Bug libffi/29152] 64-bit darwin ppc port needed for libffi

[howarth at nitro dot med dot uc dot edu]

------- Comment #4 from howarth at nitro dot med dot uc dot edu  2007-12-18 17:14 -------
Andreas,
    Can't we duplicate the existing code in darwin.S, darwin_closure.S,
ffi_darwin.c and sysv.S and wrapper it with a test for __powerpc64__ as a
starting point. I think if we at least get discussion going about what needs
changed we might slowly progress this PR. Looking at...

http://developer.apple.com/documentation/DeveloperTools/Conceptual/LowLevelABI/Articles/32bitPowerPC.html#//apple_ref/doc/uid/TP40002438
http://developer.apple.com/documentation/DeveloperTools/Conceptual/LowLevelABI/Articles/64bitPowerPC.html#//apple_ref/doc/uid/TP40002471

I see that in the Size and natural alignment of the scalar data types table the
main differences between 32-bit and 64-bit are...

                  32-bit        64-bit
Bool                 4             1
unsigned long        4             8
signed long          4             8
pointer              4             8

Parameter area to general-purpose register mapping
                 32-bit        64-bit
GPR3             SP+24         SP+48
GPR4             SP+28         SP+56
GPR5             SP+32         SP+64
GPR6             SP+36         SP+72
GRP7             SP+40         SP+80
GPR8             SP+44         SP+88
GPR9             SP+48         SP+96
GPR10            SP+52         SP+104


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29152