mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-14 22:44:27 +08:00
34060b8fff
Add accurate exception reporting in M7memcpy Signed-off-by: Babu Moger <babu.moger@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
52 lines
1017 B
ArmAsm
52 lines
1017 B
ArmAsm
/*
|
|
* M7copy_to_user.S: SPARC M7 optimized copy to userspace.
|
|
*
|
|
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
|
|
*/
|
|
|
|
|
|
#define EX_ST(x, y) \
|
|
98: x; \
|
|
.section __ex_table,"a"; \
|
|
.align 4; \
|
|
.word 98b, y; \
|
|
.text; \
|
|
.align 4;
|
|
|
|
#define EX_ST_FP(x, y) \
|
|
98: x; \
|
|
.section __ex_table,"a"; \
|
|
.align 4; \
|
|
.word 98b, y##_fp; \
|
|
.text; \
|
|
.align 4;
|
|
|
|
|
|
#ifndef ASI_AIUS
|
|
#define ASI_AIUS 0x11
|
|
#endif
|
|
|
|
#ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
|
|
#define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
|
|
#endif
|
|
|
|
#define FUNC_NAME M7copy_to_user
|
|
#define STORE(type,src,addr) type##a src, [addr] %asi
|
|
#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_AIUS
|
|
#define STORE_MRU_ASI ASI_ST_BLKINIT_MRU_S
|
|
#define EX_RETVAL(x) 0
|
|
|
|
#ifdef __KERNEL__
|
|
/* Writing to %asi is _expensive_ so we hardcode it.
|
|
* Reading %asi to check for KERNEL_DS is comparatively
|
|
* cheap.
|
|
*/
|
|
#define PREAMBLE \
|
|
rd %asi, %g1; \
|
|
cmp %g1, ASI_AIUS; \
|
|
bne,pn %icc, raw_copy_in_user; \
|
|
nop
|
|
#endif
|
|
|
|
#include "M7memcpy.S"
|