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