include/asm-sparc64/visasm.h

   1 /* $Id: visasm.h,v 1.4 1999/04/19 01:25:55 davem Exp $ */
   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 #define AOFF_task_fpregs        (((ASIZ_task) + (64 - 1)) & ~(64 - 1))
  14
  15 /* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc */
  16
  17 #define VISEntry                                        \
  18         rd              %fprs, %o5;                     \
  19         andcc           %o5, (FPRS_FEF|FPRS_DU), %g0;   \
  20         be,pt           %icc, 297f;                     \
  21          sethi          %hi(297f), %g7;                 \
  22         ba,pt           %xcc, VISenter;                 \
  23          or             %g7, %lo(297f), %g7;            \
  24 297:    wr              %g0, FPRS_FEF, %fprs;           \
  25
  26 #define VISExit                                         \
  27         wr              %g0, 0, %fprs;
  28
  29 /* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc.
  30  * Must preserve %o5 between VISEntryHalf and VISExitHalf */
  31
  32 #define VISEntryHalf                                    \
  33         rd              %fprs, %o5;                     \
  34         andcc           %o5, FPRS_FEF, %g0;             \
  35         be,pt           %icc, 297f;                     \
  36          sethi          %hi(298f), %g7;                 \
  37         ba,pt           %xcc, VISenterhalf;             \
  38          or             %g7, %lo(298f), %g7;            \
  39         clr             %o5;                            \
  40 297:    wr              %o5, FPRS_FEF, %fprs;           \
  41 298:
  42
  43 #define VISExitHalf                                     \
  44         wr              %o5, 0, %fprs;
  45
  46 #ifndef __ASSEMBLY__
  47 extern __inline__ void save_and_clear_fpu(void) {
  48         __asm__ __volatile__ ("
  49                 rd %%fprs, %%o5
  50                 andcc %%o5, %0, %%g0
  51                 be,pt %%icc, 299f
  52                  sethi %%hi(298f), %%g7
  53                 ba VISenter     ! Note. This cannot be bp, as it may be too far from VISenter.
  54                  or %%g7, %%lo(298f), %%g7
  55         298:    wr %%g0, 0, %%fprs
  56         299:
  57                 " : : "i" (FPRS_FEF|FPRS_DU) :
  58                 "o5", "g1", "g2", "g3", "g7", "cc");
  59 }
  60 #endif
  61
  62 #endif /* _SPARC64_ASI_H */