linux/arch/sparc/lib/NG4copy_to_user.S
David S. Miller 9570770480 sparc64: Convert NG4copy_{from,to}_user to accurate exception reporting.
Report the exact number of bytes which have not been successfully
copied when an exception occurs, using the running remaining length.

Signed-off-by: David S. Miller <davem@davemloft.net>
2016-10-24 18:58:05 -07:00

48 lines
943 B
ArmAsm

/* NG4copy_to_user.S: Niagara-4 optimized copy to userspace.
*
* Copyright (C) 2012 David S. Miller (davem@davemloft.net)
*/
#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 NG4copy_to_user
#define STORE(type,src,addr) type##a src, [addr] %asi
#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_AIUS
#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, ___copy_in_user; \
nop
#endif
#include "NG4memcpy.S"