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Commit 6cc0735d authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC32]: Add __cmpdi2() libcall implementation ala. MIPS. 



Device mapper generates calls to this with recent versions
of gcc.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6c8f5b90

arch/sparc/lib/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ lib-y := mul.o rem.o sdiv.o udiv.o umul.o urem.o ashrdi3.o memcpy.o memset.o \ 
         strlen.o checksum.o blockops.o memscan.o memcmp.o strncmp.o \

	 strncpy_from_user.o divdi3.o udivdi3.o strlen_user.o \

	 copy_user.o locks.o atomic.o \

	 lshrdi3.o ashldi3.o rwsem.o muldi3.o bitext.o

	 lshrdi3.o ashldi3.o rwsem.o muldi3.o bitext.o \

	 cmpdi2.o



obj-y += iomap.o atomic32.o

arch/sparc/lib/cmpdi2.c

0 → 100644
+27 −0
Original line number Diff line number Diff line 
#include <linux/module.h>



#include "libgcc.h"



word_type __cmpdi2(long long a, long long b)

{

	const DWunion au = {

		.ll = a

	};

	const DWunion bu = {

		.ll = b

	};



	if (au.s.high < bu.s.high)

		return 0;

	else if (au.s.high > bu.s.high)

		return 2;



	if ((unsigned int) au.s.low < (unsigned int) bu.s.low)

		return 0;

	else if ((unsigned int) au.s.low > (unsigned int) bu.s.low)

		return 2;



	return 1;

}



EXPORT_SYMBOL(__cmpdi2);

arch/sparc/lib/libgcc.h

0 → 100644
+18 −0
Original line number Diff line number Diff line 
#ifndef __ASM_LIBGCC_H

#define __ASM_LIBGCC_H



#include <asm/byteorder.h>



typedef int word_type __attribute__ ((mode (__word__)));



struct DWstruct {

	int high, low;

};



typedef union

{

	struct DWstruct s;

	long long ll;

} DWunion;



#endif /* __ASM_LIBGCC_H */