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__
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
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