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visasm.h

#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                            \
      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");
}
#endif

#endif /* _SPARC64_ASI_H */

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