include/asm-sparc64/visasm.h

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 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__ voidsave_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 */