LXR linux/arch/sparc/lib/GENpatch.S

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* GENpatch.S: Patch Ultra-I routines with generic variant.
   3 *
   4 * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
   5 */
   6
   7#define BRANCH_ALWAYS   0x10680000
   8#define NOP             0x01000000
   9#define GEN_DO_PATCH(OLD, NEW)  \
  10        sethi   %hi(NEW), %g1; \
  11        or      %g1, %lo(NEW), %g1; \
  12        sethi   %hi(OLD), %g2; \
  13        or      %g2, %lo(OLD), %g2; \
  14        sub     %g1, %g2, %g1; \
  15        sethi   %hi(BRANCH_ALWAYS), %g3; \
  16        sll     %g1, 11, %g1; \
  17        srl     %g1, 11 + 2, %g1; \
  18        or      %g3, %lo(BRANCH_ALWAYS), %g3; \
  19        or      %g3, %g1, %g3; \
  20        stw     %g3, [%g2]; \
  21        sethi   %hi(NOP), %g3; \
  22        or      %g3, %lo(NOP), %g3; \
  23        stw     %g3, [%g2 + 0x4]; \
  24        flush   %g2;
  25
  26        .globl  generic_patch_copyops
  27        .type   generic_patch_copyops,#function
  28generic_patch_copyops:
  29        GEN_DO_PATCH(memcpy, GENmemcpy)
  30        GEN_DO_PATCH(raw_copy_from_user, GENcopy_from_user)
  31        GEN_DO_PATCH(raw_copy_to_user, GENcopy_to_user)
  32        retl
  33         nop
  34        .size   generic_patch_copyops,.-generic_patch_copyops
  35