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e419ddeabe
Use the kernels own generic lib/muldi3.c implementation of muldi3 for 68K machines. Some 68K CPUs support 64bit multiplies so move the arch specific umul_ppmm() macro into a header file that is included by lib/muldi3.c. That way it can take advantage of the single instruction when available. There does not appear to be any existing mechanism for the generic lib/muldi3.c code to pick up an external arch definition of umul_ppmm(). Create an arch specific libgcc.h that can optionally be included by the system include/linux/libgcc.h to allow for this. Somewhat oddly there is also a similar definition of umul_ppmm() in the non-architecture code in lib/crypto/mpi/longlong.h for a wide range or machines. Its presence ends up complicating the include setup and means not being able to use something like compiler.h instead. Actually there is a few other defines of umul_ppmm() macros spread around in various architectures, but not directly usable for the m68k case. Signed-off-by: Greg Ungerer <gerg@linux-m68k.org> Link: https://lore.kernel.org/20231113133209.1367286-1-gerg@linux-m68k.org Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
16 lines
331 B
Makefile
16 lines
331 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for m68k-specific library files..
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#
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lib-y := memcpy.o memset.o memmove.o
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lib-$(CONFIG_MMU) += uaccess.o
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lib-$(CONFIG_CPU_HAS_NO_MULDIV64) += mulsi3.o divsi3.o udivsi3.o
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lib-$(CONFIG_CPU_HAS_NO_MULDIV64) += modsi3.o umodsi3.o
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ifndef CONFIG_GENERIC_CSUM
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lib-y += checksum.o
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endif
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