linux/arch/sparc/lib/NG2patch.S
Al Viro 31af2f36d5 sparc: switch to RAW_COPY_USER
... and drop zeroing in sparc32.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-04-02 12:53:15 -04:00

34 lines
879 B
ArmAsm

/* NG2patch.S: Patch Ultra-I routines with Niagara-2 variant.
*
* Copyright (C) 2007 David S. Miller <davem@davemloft.net>
*/
#define BRANCH_ALWAYS 0x10680000
#define NOP 0x01000000
#define NG_DO_PATCH(OLD, NEW) \
sethi %hi(NEW), %g1; \
or %g1, %lo(NEW), %g1; \
sethi %hi(OLD), %g2; \
or %g2, %lo(OLD), %g2; \
sub %g1, %g2, %g1; \
sethi %hi(BRANCH_ALWAYS), %g3; \
sll %g1, 11, %g1; \
srl %g1, 11 + 2, %g1; \
or %g3, %lo(BRANCH_ALWAYS), %g3; \
or %g3, %g1, %g3; \
stw %g3, [%g2]; \
sethi %hi(NOP), %g3; \
or %g3, %lo(NOP), %g3; \
stw %g3, [%g2 + 0x4]; \
flush %g2;
.globl niagara2_patch_copyops
.type niagara2_patch_copyops,#function
niagara2_patch_copyops:
NG_DO_PATCH(memcpy, NG2memcpy)
NG_DO_PATCH(raw_copy_from_user, NG2copy_from_user)
NG_DO_PATCH(raw_copy_to_user, NG2copy_to_user)
retl
nop
.size niagara2_patch_copyops,.-niagara2_patch_copyops