[patch] libffi, fix powerpc-unknown-freebsd

[Andreas Tobler]

David Edelsohn wrote:
> 	* src/powerpc/ffitarget.h (ffi_abi): Add FFI_LINUX and
> 	FFI_LINUX_SOFT_FLOAT to the POWERPC_FREEBSD enum.
> 	Adjust copyright notice.
> 	* src/powerpc/ffi.c (ffi_prep_cif_machdep): Fix bit position
> 	calculation for FFI_SYSV_TYPE_SMALL_STRUCT.
> 	(ffi_closure_helper_SYSV): Fix return type for
> 	FFI_SYSV_TYPE_SMALL_STRUCT.
> 	Adjust copyright notice.
> 
> Okay.
> 
> Please add more documentation for FFI_SYSV_TYPE_SMALL_STRUCT -- what
> it represents and that it uses two bits.

Sigh, I expected that... I should know you :)

Here another iteration.

Instead of playing with FFI_SYSV_TYPE_SMALL_STRUCT for bit shifts I 
introduced two new flags which tell us if we need r3 or r3 and r4 for 
structs passing.

The issue is this, I need to tell the ppc_closure.S exactly which type I 
expect when returning. And unfortunatley the implementation needs a 
distinction for every type and size. Type 1 to 15 are already used, so I 
can start with using type 16 and up.

If it is still not clear, let me know, I try to be more verbose then.

The attached patch was tested under fbsd-7.0 gcc-4.3 and trunk.
Currently a ppc-linux build is running for base config and also for 
soft-float.


2008-08-21  Andreas Tobler  <a.tobler@schweiz.org>

	* src/powerpc/ffitarget.h (ffi_abi): Add FFI_LINUX and
	FFI_LINUX_SOFT_FLOAT to the POWERPC_FREEBSD enum.
	Adjust copyright notice.
	* src/powerpc/ffi.c: Add two new flags to indicate if we have one
	register or two register to use for FFI_SYSV structs.
	(ffi_prep_cif_machdep): Pass the right register flag introduced above.
	(ffi_closure_helper_SYSV): Fix the return type for
	FFI_SYSV_TYPE_SMALL_STRUCT. Comment.
	Adjust copyright notice.
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