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/arch/sparc64/lib/U3patch.S

https://bitbucket.org/evzijst/gittest
Assembly | 32 lines | 30 code | 2 blank | 0 comment | 0 complexity | b0ac56bd7257ea4c8a90a0536cb0c00c MD5 | raw file
 1/* U3patch.S: Patch Ultra-I routines with Ultra-III variant.
 2 *
 3 * Copyright (C) 2004 David S. Miller <davem@redhat.com>
 4 */
 5
 6#define BRANCH_ALWAYS	0x10680000
 7#define NOP		0x01000000
 8#define ULTRA3_DO_PATCH(OLD, NEW)	\
 9	sethi	%hi(NEW), %g1; \
10	or	%g1, %lo(NEW), %g1; \
11	sethi	%hi(OLD), %g2; \
12	or	%g2, %lo(OLD), %g2; \
13	sub	%g1, %g2, %g1; \
14	sethi	%hi(BRANCH_ALWAYS), %g3; \
15	srl	%g1, 2, %g1; \
16	or	%g3, %lo(BRANCH_ALWAYS), %g3; \
17	or	%g3, %g1, %g3; \
18	stw	%g3, [%g2]; \
19	sethi	%hi(NOP), %g3; \
20	or	%g3, %lo(NOP), %g3; \
21	stw	%g3, [%g2 + 0x4]; \
22	flush	%g2;
23
24	.globl	cheetah_patch_copyops
25	.type	cheetah_patch_copyops,#function
26cheetah_patch_copyops:
27	ULTRA3_DO_PATCH(memcpy, U3memcpy)
28	ULTRA3_DO_PATCH(___copy_from_user, U3copy_from_user)
29	ULTRA3_DO_PATCH(___copy_to_user, U3copy_to_user)
30	retl
31	 nop
32	.size	cheetah_patch_copyops,.-cheetah_patch_copyops