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Commit 79db7958 authored by David S. Miller's avatar David S. Miller
Browse files

sparc64: Don't clibber fixed registers in __multi4. 



%g4 and %g5 are fixed registers used by the kernel for the thread
pointer and the per-cpu offset.  Use %o4 and %g7 instead.

Diagnosis by Anthony Yznaga.

Fixes: 1b4af13f ("sparc64: Add __multi3 for gcc 7.x and later.")
Reported-by: default avatarAnatoly Pugachev <matorola@gmail.com>
Tested-by: default avatarAnatoly Pugachev <matorola@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9157259d

arch/sparc/lib/multi3.S

+12 −12
Original line number Diff line number Diff line
@@ -5,26 +5,26 @@ 
	.align	4

ENTRY(__multi3) /* %o0 = u, %o1 = v */

	mov	%o1, %g1

	srl	%o3, 0, %g4

	mulx	%g4, %g1, %o1

	srl	%o3, 0, %o4

	mulx	%o4, %g1, %o1

	srlx	%g1, 0x20, %g3

	mulx	%g3, %g4, %g5

	sllx	%g5, 0x20, %o5

	srl	%g1, 0, %g4

	mulx	%g3, %o4, %g7

	sllx	%g7, 0x20, %o5

	srl	%g1, 0, %o4

	sub	%o1, %o5, %o5

	srlx	%o5, 0x20, %o5

	addcc	%g5, %o5, %g5

	addcc	%g7, %o5, %g7

	srlx	%o3, 0x20, %o5

	mulx	%g4, %o5, %g4

	mulx	%o4, %o5, %o4

	mulx	%g3, %o5, %o5

	sethi	%hi(0x80000000), %g3

	addcc	%g5, %g4, %g5

	srlx	%g5, 0x20, %g5

	addcc	%g7, %o4, %g7

	srlx	%g7, 0x20, %g7

	add	%g3, %g3, %g3

	movcc	%xcc, %g0, %g3

	addcc	%o5, %g5, %o5

	sllx	%g4, 0x20, %g4

	add	%o1, %g4, %o1

	addcc	%o5, %g7, %o5

	sllx	%o4, 0x20, %o4

	add	%o1, %o4, %o1

	add	%o5, %g3, %g2

	mulx	%g1, %o2, %g1

	add	%g1, %g2, %g1