visasm.h

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#ifndef _SPARC64_VISASM_H
#define _SPARC64_VISASM_H

/* visasm.h:  FPU saving macros for VIS routines
 *
 * Copyright (C) 1998 Jakub Jelinek ([email protected])
 */

#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                    \
    rd      %fprs, %o5;         \
    andcc       %o5, FPRS_FEF, %g0;     \
    be,pt       %icc, 297f;         \
     sethi      %hi(298f), %g7;         \
    sethi       %hi(VISenterhalf), %g1;     \
    jmpl        %g1 + %lo(VISenterhalf), %g0;   \
     or     %g7, %lo(298f), %g7;        \
    clr     %o5;                \
297:    wr      %o5, FPRS_FEF, %fprs;       \
298:

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

#ifndef __ASSEMBLY__
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");
}
extern int vis_emul(struct pt_regs *, unsigned int);
#endif

#endif /* _SPARC64_ASI_H */