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Annotation of sys/arch/m68k/fpsp/x_unimp.sa, Revision 1.1.1.1

1.1       nbrk        1: *      $OpenBSD: x_unimp.sa,v 1.2 1996/05/29 21:05:50 niklas Exp $
                      2: *      $NetBSD: x_unimp.sa,v 1.2 1994/10/26 07:50:32 cgd Exp $
                      3:
                      4: *      MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
                      5: *      M68000 Hi-Performance Microprocessor Division
                      6: *      M68040 Software Package
                      7: *
                      8: *      M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
                      9: *      All rights reserved.
                     10: *
                     11: *      THE SOFTWARE is provided on an "AS IS" basis and without warranty.
                     12: *      To the maximum extent permitted by applicable law,
                     13: *      MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
                     14: *      INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
                     15: *      PARTICULAR PURPOSE and any warranty against infringement with
                     16: *      regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
                     17: *      and any accompanying written materials.
                     18: *
                     19: *      To the maximum extent permitted by applicable law,
                     20: *      IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
                     21: *      (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
                     22: *      PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR
                     23: *      OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
                     24: *      SOFTWARE.  Motorola assumes no responsibility for the maintenance
                     25: *      and support of the SOFTWARE.
                     26: *
                     27: *      You are hereby granted a copyright license to use, modify, and
                     28: *      distribute the SOFTWARE so long as this entire notice is retained
                     29: *      without alteration in any modified and/or redistributed versions,
                     30: *      and that such modified versions are clearly identified as such.
                     31: *      No licenses are granted by implication, estoppel or otherwise
                     32: *      under any patents or trademarks of Motorola, Inc.
                     33:
                     34: *
                     35: *      x_unimp.sa 3.3 7/1/91
                     36: *
                     37: *      fpsp_unimp --- FPSP handler for unimplemented instruction
                     38: *      exception.
                     39: *
                     40: * Invoked when the user program encounters a floating-point
                     41: * op-code that hardware does not support.  Trap vector# 11
                     42: * (See table 8-1 MC68030 User's Manual).
                     43: *
                     44: *
                     45: * Note: An fsave for an unimplemented inst. will create a short
                     46: * fsave stack.
                     47: *
                     48: *  Input: 1. Six word stack frame for unimplemented inst, four word
                     49: *            for illegal
                     50: *            (See table 8-7 MC68030 User's Manual).
                     51: *         2. Unimp (short) fsave state frame created here by fsave
                     52: *            instruction.
                     53: *
                     54:
                     55: X_UNIMP        IDNT    2,1 Motorola 040 Floating Point Software Package
                     56:
                     57:        section 8
                     58:
                     59:        include fpsp.h
                     60:
                     61:        xref    get_op
                     62:        xref    do_func
                     63:        xref    sto_res
                     64:        xref    gen_except
                     65:        xref    fpsp_fmt_error
                     66:
                     67:        xdef    fpsp_unimp
                     68:        xdef    uni_2
                     69: fpsp_unimp:
                     70:        link            a6,#-LOCAL_SIZE
                     71:        fsave           -(a7)
                     72: uni_2:
                     73:        movem.l         d0-d1/a0-a1,USER_DA(a6)
                     74:        fmovem.x        fp0-fp3,USER_FP0(a6)
                     75:        fmovem.l        fpcr/fpsr/fpiar,USER_FPCR(a6)
                     76:        move.b          (a7),d0         ;test for valid version num
                     77:        andi.b          #$f0,d0         ;test for $4x
                     78:        cmpi.b          #VER_4,d0       ;must be $4x or exit
                     79:        bne.l           fpsp_fmt_error
                     80: *
                     81: *      Temporary D25B Fix
                     82: *      The following lines are used to ensure that the FPSR
                     83: *      exception byte and condition codes are clear before proceeding
                     84: *
                     85:        move.l          USER_FPSR(a6),d0
                     86:        and.l           #$FF00FF,d0     ;clear all but accrued exceptions
                     87:        move.l          d0,USER_FPSR(a6)
                     88:        fmove.l         #0,FPSR ;clear all user bits
                     89:        fmove.l         #0,FPCR ;clear all user exceptions for FPSP
                     90:
                     91:        clr.b           UFLG_TMP(a6)    ;clr flag for unsupp data
                     92:
                     93:        bsr.l           get_op          ;go get operand(s)
                     94:        clr.b           STORE_FLG(a6)
                     95:        bsr.l           do_func         ;do the function
                     96:        fsave           -(a7)           ;capture possible exc state
                     97:        tst.b           STORE_FLG(a6)
                     98:        bne.b           no_store        ;if STORE_FLG is set, no store
                     99:        bsr.l           sto_res         ;store the result in user space
                    100: no_store:
                    101:        bra.l           gen_except      ;post any exceptions and return
                    102:
                    103:        end