Commit 344480b9 authored by Paul Mackerras's avatar Paul Mackerras
Browse files

powerpc: Fix a corner case in __div64_32 



The code was incorrectly doing a division by 0 in the case where
the denominator was 0x100000000 and the divisor was 0xffffffff.
Thanks to Fred Liu of Motorola for pointing this out.

Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent a4bcc95a

arch/powerpc/lib/div64.S

+2 −1
Original line number Diff line number Diff line
@@ -33,9 +33,10 @@ _GLOBAL(__div64_32) 
	cntlzw	r0,r5		# we are shifting the dividend right

	li	r10,-1		# to make it < 2^32, and shifting

	srw	r10,r10,r0	# the divisor right the same amount,

	add	r9,r4,r10	# rounding up (so the estimate cannot

	addc	r9,r4,r10	# rounding up (so the estimate cannot

	andc	r11,r6,r10	# ever be too large, only too small)

	andc	r9,r9,r10

	addze	r9,r9

	or	r11,r5,r11

	rotlw	r9,r9,r0

	rotlw	r11,r11,r0