sparc/lib/M7patch.S

0001 /*
0002  * M7patch.S: Patch generic routines with M7 variant.
0003  *
0004  * Copyright (c) 2016, Oracle and/or its affiliates.  All rights reserved.
0005  */
0006
0007 #include <linux/linkage.h>
0008
0009 #define BRANCH_ALWAYS   0x10680000
0010 #define NOP     0x01000000
0011 #define NG_DO_PATCH(OLD, NEW)   \
0012     sethi   %hi(NEW), %g1; \
0013     or  %g1, %lo(NEW), %g1; \
0014     sethi   %hi(OLD), %g2; \
0015     or  %g2, %lo(OLD), %g2; \
0016     sub %g1, %g2, %g1; \
0017     sethi   %hi(BRANCH_ALWAYS), %g3; \
0018     sll %g1, 11, %g1; \
0019     srl %g1, 11 + 2, %g1; \
0020     or  %g3, %lo(BRANCH_ALWAYS), %g3; \
0021     or  %g3, %g1, %g3; \
0022     stw %g3, [%g2]; \
0023     sethi   %hi(NOP), %g3; \
0024     or  %g3, %lo(NOP), %g3; \
0025     stw %g3, [%g2 + 0x4]; \
0026     flush   %g2;
0027
0028 ENTRY(m7_patch_copyops)
0029     NG_DO_PATCH(memcpy, M7memcpy)
0030     NG_DO_PATCH(raw_copy_from_user, M7copy_from_user)
0031     NG_DO_PATCH(raw_copy_to_user, M7copy_to_user)
0032     retl
0033      nop
0034 ENDPROC(m7_patch_copyops)
0035
0036 ENTRY(m7_patch_bzero)
0037     NG_DO_PATCH(memset, M7memset)
0038     NG_DO_PATCH(__bzero, M7bzero)
0039     NG_DO_PATCH(__clear_user, NGclear_user)
0040     NG_DO_PATCH(tsb_init, NGtsb_init)
0041     retl
0042      nop
0043 ENDPROC(m7_patch_bzero)
0044
0045 ENTRY(m7_patch_pageops)
0046     NG_DO_PATCH(copy_user_page, NG4copy_user_page)
0047     NG_DO_PATCH(_clear_page, M7clear_page)
0048     NG_DO_PATCH(clear_user_page, M7clear_user_page)
0049     retl
0050      nop
0051 ENDPROC(m7_patch_pageops)