LXR linux/arch/sparc/lib/U3patch.S

   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        sll     %g1, 11, %g1; \
  16        srl     %g1, 11 + 2, %g1; \
  17        or      %g3, %lo(BRANCH_ALWAYS), %g3; \
  18        or      %g3, %g1, %g3; \
  19        stw     %g3, [%g2]; \
  20        sethi   %hi(NOP), %g3; \
  21        or      %g3, %lo(NOP), %g3; \
  22        stw     %g3, [%g2 + 0x4]; \
  23        flush   %g2;
  24
  25        .globl  cheetah_patch_copyops
  26        .type   cheetah_patch_copyops,#function
  27cheetah_patch_copyops:
  28        ULTRA3_DO_PATCH(memcpy, U3memcpy)
  29        ULTRA3_DO_PATCH(___copy_from_user, U3copy_from_user)
  30        ULTRA3_DO_PATCH(___copy_to_user, U3copy_to_user)
  31        retl
  32         nop
  33        .size   cheetah_patch_copyops,.-cheetah_patch_copyops
  34