include/asm/visasm.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _SPARC64_VISASM_H
0003 #define _SPARC64_VISASM_H
0004
0005 /* visasm.h:  FPU saving macros for VIS routines
0006  *
0007  * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
0008  */
0009
0010 #include <asm/pstate.h>
0011 #include <asm/ptrace.h>
0012
0013 /* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc */
0014
0015 #define VISEntry                    \
0016     rd      %fprs, %o5;         \
0017     andcc       %o5, (FPRS_FEF|FPRS_DU), %g0;   \
0018     be,pt       %icc, 297f;         \
0019      sethi      %hi(297f), %g7;         \
0020     sethi       %hi(VISenter), %g1;     \
0021     jmpl        %g1 + %lo(VISenter), %g0;   \
0022      or     %g7, %lo(297f), %g7;        \
0023 297:    wr      %g0, FPRS_FEF, %fprs;       \
0024
0025 #define VISExit                     \
0026     wr      %g0, 0, %fprs;
0027
0028 /* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc.
0029  * Must preserve %o5 between VISEntryHalf and VISExitHalf */
0030
0031 #define VISEntryHalf                    \
0032     VISEntry
0033
0034 #define VISExitHalf                 \
0035     VISExit
0036
0037 #define VISEntryHalfFast(fail_label)            \
0038     rd      %fprs, %o5;         \
0039     andcc       %o5, FPRS_FEF, %g0;     \
0040     be,pt       %icc, 297f;         \
0041      nop;                       \
0042     ba,a,pt     %xcc, fail_label;       \
0043 297:    wr      %o5, FPRS_FEF, %fprs;
0044
0045 #define VISExitHalfFast                 \
0046     wr      %o5, 0, %fprs;
0047
0048 #ifndef __ASSEMBLY__
0049 static inline void save_and_clear_fpu(void) {
0050     __asm__ __volatile__ (
0051 "       rd %%fprs, %%o5\n"
0052 "       andcc %%o5, %0, %%g0\n"
0053 "       be,pt %%icc, 299f\n"
0054 "        sethi %%hi(298f), %%g7\n"
0055 "       sethi %%hi(VISenter), %%g1\n"
0056 "       jmpl %%g1 + %%lo(VISenter), %%g0\n"
0057 "        or %%g7, %%lo(298f), %%g7\n"
0058 "   298:    wr %%g0, 0, %%fprs\n"
0059 "   299:\n"
0060 "       " : : "i" (FPRS_FEF|FPRS_DU) :
0061         "o5", "g1", "g2", "g3", "g7", "cc");
0062 }
0063
0064 int vis_emul(struct pt_regs *, unsigned int);
0065 #endif
0066
0067 #endif /* _SPARC64_ASI_H */