/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SPARC64_VISASM_H
#define _SPARC64_VISASM_H

/* visasm.h:  FPU saving macros for VIS routines
 *
 * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
 */

#include <asm/pstate.h>
#include <asm/ptrace.h>

/* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc */

#define VISEntry                                        \
        rd              %fprs, %o5;                     \
        andcc           %o5, (FPRS_FEF|FPRS_DU), %g0;   \
        be,pt           %icc, 297f;                     \
         sethi          %hi(297f), %g7;                 \
        sethi           %hi(VISenter), %g1;             \
        jmpl            %g1 + %lo(VISenter), %g0;       \
         or             %g7, %lo(297f), %g7;            \
297:    wr              %g0, FPRS_FEF, %fprs;           \

#define VISExit                                         \
        wr              %g0, 0, %fprs;

/* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc.
 * Must preserve %o5 between VISEntryHalf and VISExitHalf */

#define VISEntryHalf                                    \
        VISEntry

#define VISExitHalf                                     \
        VISExit

#define VISEntryHalfFast(fail_label)                    \
        rd              %fprs, %o5;                     \
        andcc           %o5, FPRS_FEF, %g0;             \
        be,pt           %icc, 297f;                     \
         nop;                                           \
        ba,a,pt         %xcc, fail_label;               \
297:    wr              %o5, FPRS_FEF, %fprs;

#define VISExitHalfFast                                 \
        wr              %o5, 0, %fprs;

#ifndef __ASSEMBLER__
static inline void save_and_clear_fpu(void) {
        __asm__ __volatile__ (
"               rd %%fprs, %%o5\n"
"               andcc %%o5, %0, %%g0\n"
"               be,pt %%icc, 299f\n"
"                sethi %%hi(298f), %%g7\n"
"               sethi %%hi(VISenter), %%g1\n"
"               jmpl %%g1 + %%lo(VISenter), %%g0\n"
"                or %%g7, %%lo(298f), %%g7\n"
"       298:    wr %%g0, 0, %%fprs\n"
"       299:\n"
"               " : : "i" (FPRS_FEF|FPRS_DU) :
                "o5", "g1", "g2", "g3", "g7", "cc");
}

int vis_emul(struct pt_regs *, unsigned int);
#endif

#endif /* _SPARC64_ASI_H */