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| author | Greg Ungerer <gerg@uclinux.org> | 2011-11-11 06:13:08 +0100 |
|---|---|---|
| committer | Greg Ungerer <gerg@uclinux.org> | 2011-12-24 12:47:57 +0100 |
| commit | 84f3fb7a2aadeda3c0a34e61591a8eccf5e367b4 (patch) | |
| tree | a1d64dd3c6da8726cb74bb206d4da15228cfdae2 /arch/m68k/lib | |
| parent | m68k: simpler m68k and ColdFire CPU's can use generic csum code (diff) | |
| download | linux-84f3fb7a2aadeda3c0a34e61591a8eccf5e367b4.tar.xz linux-84f3fb7a2aadeda3c0a34e61591a8eccf5e367b4.zip | |
m68k: handle presence of 64bit mul/div instructions cleanly
The traditional 68000 processors and the newer reduced instruction set
ColdFire processors do not support the 32*32->64 multiply or the 64/32->32
divide instructions. This is not a difference based on the presence of
a hardware MMU or not.
Create a new config symbol to mark that a CPU type doesn't support the
longer multiply/divide instructions. Use this then as a basis for using
the fast 64bit based divide (in div64.h) and for linking in the extra
libgcc functions that may be required (mulsi3, divsi3, etc).
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/lib')
| -rw-r--r-- | arch/m68k/lib/Makefile | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/m68k/lib/Makefile b/arch/m68k/lib/Makefile index b3b40e4ed339..a9d782d34276 100644 --- a/arch/m68k/lib/Makefile +++ b/arch/m68k/lib/Makefile @@ -6,11 +6,9 @@ lib-y := ashldi3.o ashrdi3.o lshrdi3.o muldi3.o \ memcpy.o memset.o memmove.o -ifdef CONFIG_MMU -lib-y += string.o uaccess.o -else -lib-y += mulsi3.o divsi3.o udivsi3.o modsi3.o umodsi3.o -endif +lib-$(CONFIG_MMU) += string.o uaccess.o +lib-$(CONFIG_CPU_HAS_NO_MULDIV64) += mulsi3.o divsi3.o udivsi3.o +lib-$(CONFIG_CPU_HAS_NO_MULDIV64) += modsi3.o umodsi3.o ifndef CONFIG_GENERIC_CSUM lib-y += checksum.o |