Commit b35cd988 authored by Palmer Dabbelt's avatar Palmer Dabbelt
Browse files

lib: Add shared copies of some GCC library routines 



Many ports (m32r, microblaze, mips, parisc, score, and sparc) use
functionally identical copies of various GCC library routine files,
which came up as we were submitting the RISC-V port (which also uses
some of these).

This patch adds a new copy of these library routine files, which are
functionally identical to the various other copies.  These are
availiable via Kconfig as CONFIG_GENERIC_$ROUTINE, which currently isn't
used anywhere.

Reviewed-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: default avatarPalmer Dabbelt <palmer@dabbelt.com>
parent c98cfe4a

include/lib/libgcc.h

0 → 100644
+43 −0
Original line number Diff line number Diff line 
/*

 * include/lib/libgcc.h

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, see the file COPYING, or write

 * to the Free Software Foundation, Inc.

 */



#ifndef __LIB_LIBGCC_H

#define __LIB_LIBGCC_H



#include <asm/byteorder.h>



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



#ifdef __BIG_ENDIAN

struct DWstruct {

	int high, low;

};

#elif defined(__LITTLE_ENDIAN)

struct DWstruct {

	int low, high;

};

#else

#error I feel sick.

#endif



typedef union {

	struct DWstruct s;

	long long ll;

} DWunion;



#endif /* __ASM_LIBGCC_H */

lib/Kconfig

+18 −0
Original line number Diff line number Diff line
@@ -587,3 +587,21 @@ config STRING_SELFTEST 
	bool "Test string functions"



endmenu



config GENERIC_ASHLDI3

	bool



config GENERIC_ASHRDI3

	bool



config GENERIC_LSHRDI3

	bool



config GENERIC_MULDI3

	bool



config GENERIC_CMPDI2

	bool



config GENERIC_UCMPDI2

	bool

lib/Makefile

+8 −0
Original line number Diff line number Diff line
@@ -247,3 +247,11 @@ UBSAN_SANITIZE_ubsan.o := n 
obj-$(CONFIG_SBITMAP) += sbitmap.o



obj-$(CONFIG_PARMAN) += parman.o



# GCC library routines

obj-$(CONFIG_GENERIC_ASHLDI3) += ashldi3.o

obj-$(CONFIG_GENERIC_ASHRDI3) += ashrdi3.o

obj-$(CONFIG_GENERIC_LSHRDI3) += lshrdi3.o

obj-$(CONFIG_GENERIC_MULDI3) += muldi3.o

obj-$(CONFIG_GENERIC_CMPDI2) += cmpdi2.o

obj-$(CONFIG_GENERIC_UCMPDI2) += ucmpdi2.o

lib/ashldi3.c

0 → 100644
+44 −0
Original line number Diff line number Diff line 
/*

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, see the file COPYING, or write

 * to the Free Software Foundation, Inc.

 */



#include <linux/export.h>



#include <lib/libgcc.h>



long long notrace __ashldi3(long long u, word_type b)

{

	DWunion uu, w;

	word_type bm;



	if (b == 0)

		return u;



	uu.ll = u;

	bm = 32 - b;



	if (bm <= 0) {

		w.s.low = 0;

		w.s.high = (unsigned int) uu.s.low << -bm;

	} else {

		const unsigned int carries = (unsigned int) uu.s.low >> bm;



		w.s.low = (unsigned int) uu.s.low << b;

		w.s.high = ((unsigned int) uu.s.high << b) | carries;

	}



	return w.ll;

}

EXPORT_SYMBOL(__ashldi3);

lib/ashrdi3.c

0 → 100644
+46 −0
Original line number Diff line number Diff line 
/*

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, see the file COPYING, or write

 * to the Free Software Foundation, Inc.

 */



#include <linux/export.h>



#include <lib/libgcc.h>



long long notrace __ashrdi3(long long u, word_type b)

{

	DWunion uu, w;

	word_type bm;



	if (b == 0)

		return u;



	uu.ll = u;

	bm = 32 - b;



	if (bm <= 0) {

		/* w.s.high = 1..1 or 0..0 */

		w.s.high =

		    uu.s.high >> 31;

		w.s.low = uu.s.high >> -bm;

	} else {

		const unsigned int carries = (unsigned int) uu.s.high << bm;



		w.s.high = uu.s.high >> b;

		w.s.low = ((unsigned int) uu.s.low >> b) | carries;

	}



	return w.ll;

}

EXPORT_SYMBOL(__ashrdi3);

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