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Experimentation reveals that gcc ignores -mrtd for the implicit arithmetic functions (e.g. __udivdi3), but not for the implicit memcpy() and memset() functions. Mark the implicit arithmetic functions with __attribute__((cdecl)) to compensate for this. (Note: we cannot mark with with __cdecl, because we define __cdecl to incorporate regparm(0) as well.)
27 lines
900 B
C
27 lines
900 B
C
#ifndef _LIBGCC_H
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#define _LIBGCC_H
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#include <stdint.h>
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#include <stddef.h>
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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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*/
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#define LIBGCC __attribute__ (( cdecl ))
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extern LIBGCC uint64_t __udivmoddi4(uint64_t num, uint64_t den, uint64_t *rem);
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extern LIBGCC uint64_t __udivdi3(uint64_t num, uint64_t den);
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extern LIBGCC uint64_t __umoddi3(uint64_t num, uint64_t den);
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extern LIBGCC int64_t __divdi3(int64_t num, int64_t den);
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extern LIBGCC int64_t __moddi3(int64_t num, int64_t den);
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#endif /* _LIBGCC_H */
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