39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
#ifndef _BITS_COMPILER_H
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#define _BITS_COMPILER_H
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#ifndef ASSEMBLY
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/** Declare a function with standard calling conventions */
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#define __asmcall __attribute__ (( cdecl, regparm(0) ))
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/**
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* Declare a function with libgcc implicit linkage
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*
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* It seems as though gcc expects its implicit arithmetic functions to
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* be cdecl, even if -mrtd is specified. This is somewhat
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* inconsistent; for example, if -mregparm=3 is used then the implicit
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* functions do become regparm(3).
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*
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* The implicit calls to memcpy() and memset() which gcc can generate
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* do not seem to have this inconsistency; -mregparm and -mrtd affect
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* them in the same way as any other function.
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*
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* Update (25/4/14): it appears that more recent gcc versions do allow
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* -mrtd to affect calls to the implicit arithmetic functions. There
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* is nothing obvious in the gcc changelogs to indicate precisely when
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* this happened. From experimentation with available gcc versions,
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* the change occurred sometime between v4.6.3 and v4.7.2. We assume
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* that only versions up to v4.6.x require the special treatment.
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*/
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#if ( __GNUC__ < 4 ) || ( ( __GNUC__ == 4 ) && ( __GNUC_MINOR__ <= 6 ) )
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#define __libgcc __attribute__ (( cdecl ))
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#else
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#define __libgcc
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#endif
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#endif /* ASSEMBLY */
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#endif /* _BITS_COMPILER_H */
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