xref: /openbmc/linux/arch/sparc/include/asm/visasm.h (revision b2441318)
1 /* SPDX-License-Identifier: GPL-2.0 */
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 /* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc */
14 
15 #define VISEntry					\
16 	rd		%fprs, %o5;			\
17 	andcc		%o5, (FPRS_FEF|FPRS_DU), %g0;	\
18 	be,pt		%icc, 297f;			\
19 	 sethi		%hi(297f), %g7;			\
20 	sethi		%hi(VISenter), %g1;		\
21 	jmpl		%g1 + %lo(VISenter), %g0;	\
22 	 or		%g7, %lo(297f), %g7;		\
23 297:	wr		%g0, FPRS_FEF, %fprs;		\
24 
25 #define VISExit						\
26 	wr		%g0, 0, %fprs;
27 
28 /* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc.
29  * Must preserve %o5 between VISEntryHalf and VISExitHalf */
30 
31 #define VISEntryHalf					\
32 	VISEntry
33 
34 #define VISExitHalf					\
35 	VISExit
36 
37 #define VISEntryHalfFast(fail_label)			\
38 	rd		%fprs, %o5;			\
39 	andcc		%o5, FPRS_FEF, %g0;		\
40 	be,pt		%icc, 297f;			\
41 	 nop;						\
42 	ba,a,pt		%xcc, fail_label;		\
43 297:	wr		%o5, FPRS_FEF, %fprs;
44 
45 #define VISExitHalfFast					\
46 	wr		%o5, 0, %fprs;
47 
48 #ifndef __ASSEMBLY__
save_and_clear_fpu(void)49 static inline void save_and_clear_fpu(void) {
50 	__asm__ __volatile__ (
51 "		rd %%fprs, %%o5\n"
52 "		andcc %%o5, %0, %%g0\n"
53 "		be,pt %%icc, 299f\n"
54 "		 sethi %%hi(298f), %%g7\n"
55 "		sethi %%hi(VISenter), %%g1\n"
56 "		jmpl %%g1 + %%lo(VISenter), %%g0\n"
57 "		 or %%g7, %%lo(298f), %%g7\n"
58 "	298:	wr %%g0, 0, %%fprs\n"
59 "	299:\n"
60 "		" : : "i" (FPRS_FEF|FPRS_DU) :
61 		"o5", "g1", "g2", "g3", "g7", "cc");
62 }
63 
64 int vis_emul(struct pt_regs *, unsigned int);
65 #endif
66 
67 #endif /* _SPARC64_ASI_H */
68