1/* $Id: visasm.h,v 1.1.1.1 2008/10/15 03:27:27 james26_jang Exp $ */
2#ifndef _SPARC64_VISASM_H
3#define _SPARC64_VISASM_H
4
5/* visasm.h:  FPU saving macros for VIS routines
6 *
7 * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
8 */
9
10#include <asm/pstate.h>
11#include <asm/ptrace.h>
12
13#define AOFF_task_fpregs	(((ASIZ_task) + (64 - 1)) & ~(64 - 1))
14
15/* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc */
16
17#define VISEntry					\
18	rd		%fprs, %o5;			\
19	andcc		%o5, (FPRS_FEF|FPRS_DU), %g0;	\
20	be,pt		%icc, 297f;			\
21	 sethi		%hi(297f), %g7;			\
22	ba,pt		%xcc, VISenter;			\
23	 or		%g7, %lo(297f), %g7;		\
24297:	wr		%g0, FPRS_FEF, %fprs;		\
25
26#define VISExit						\
27	wr		%g0, 0, %fprs;
28
29/* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc.
30 * Must preserve %o5 between VISEntryHalf and VISExitHalf */
31
32#define VISEntryHalf					\
33	rd		%fprs, %o5;			\
34	andcc		%o5, FPRS_FEF, %g0;		\
35	be,pt		%icc, 297f;			\
36	 sethi		%hi(298f), %g7;			\
37	ba,pt		%xcc, VISenterhalf;		\
38	 or		%g7, %lo(298f), %g7;		\
39	clr		%o5;				\
40297:	wr		%o5, FPRS_FEF, %fprs;		\
41298:
42
43#define VISExitHalf					\
44	wr		%o5, 0, %fprs;
45
46#ifndef __ASSEMBLY__
47extern __inline__ void save_and_clear_fpu(void) {
48	__asm__ __volatile__ (
49"		rd %%fprs, %%o5\n"
50"		andcc %%o5, %0, %%g0\n"
51"		be,pt %%icc, 299f\n"
52"		 sethi %%hi(298f), %%g7\n"
53"		ba VISenter	! Note. This cannot be bp, as it may be too far from VISenter.\n"
54"		 or %%g7, %%lo(298f), %%g7\n"
55"	298:	wr %%g0, 0, %%fprs\n"
56"	299:\n"
57"		" : : "i" (FPRS_FEF|FPRS_DU) :
58		"o5", "g1", "g2", "g3", "g7", "cc");
59}
60#endif
61
62#endif /* _SPARC64_ASI_H */
63