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Annotation of sys/arch/m68k/fpsp/x_unsupp.sa, Revision 1.1

1.1     ! nbrk        1: *      $OpenBSD: x_unsupp.sa,v 1.2 1996/05/29 21:05:50 niklas Exp $
        !             2: *      $NetBSD: x_unsupp.sa,v 1.2 1994/10/26 07:50:33 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_unsupp.sa 3.3 7/1/91
        !            36: *
        !            37: *      fpsp_unsupp --- FPSP handler for unsupported data type exception
        !            38: *
        !            39: * Trap vector #55      (See table 8-1 Mc68030 User's manual).
        !            40: * Invoked when the user program encounters a data format (packed) that
        !            41: * hardware does not support or a data type (denormalized numbers or un-
        !            42: * normalized numbers).
        !            43: * Normalizes denorms and unnorms, unpacks packed numbers then stores
        !            44: * them back into the machine to let the 040 finish the operation.
        !            45: *
        !            46: * Unsupp calls two routines:
        !            47: *      1. get_op -  gets the operand(s)
        !            48: *      2. res_func - restore the function back into the 040 or
        !            49: *                      if fmove.p fpm,<ea> then pack source (fpm)
        !            50: *                      and store in users memory <ea>.
        !            51: *
        !            52: *  Input: Long fsave stack frame
        !            53: *
        !            54:
        !            55: X_UNSUPP       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    res_func
        !            63:        xref    gen_except
        !            64:        xref    fpsp_fmt_error
        !            65:
        !            66:        xdef    fpsp_unsupp
        !            67: fpsp_unsupp:
        !            68: *
        !            69:        link            a6,#-LOCAL_SIZE
        !            70:        fsave           -(a7)
        !            71:        movem.l         d0-d1/a0-a1,USER_DA(a6)
        !            72:        fmovem.x        fp0-fp3,USER_FP0(a6)
        !            73:        fmovem.l        fpcr/fpsr/fpiar,USER_FPCR(a6)
        !            74:
        !            75:
        !            76:        move.b          (a7),VER_TMP(a6) ;save version number
        !            77:        move.b          (a7),d0         ;test for valid version num
        !            78:        andi.b          #$f0,d0         ;test for $4x
        !            79:        cmpi.b          #VER_4,d0       ;must be $4x or exit
        !            80:        bne.l           fpsp_fmt_error
        !            81:
        !            82:        fmove.l         #0,FPSR         ;clear all user status bits
        !            83:        fmove.l         #0,FPCR         ;clear all user control bits
        !            84: *
        !            85: *      The following lines are used to ensure that the FPSR
        !            86: *      exception byte and condition codes are clear before proceeding,
        !            87: *      except in the case of fmove, which leaves the cc's intact.
        !            88: *
        !            89: unsupp_con:
        !            90:        move.l          USER_FPSR(a6),d1
        !            91:        btst            #5,CMDREG1B(a6) ;looking for fmove out
        !            92:        bne             fmove_con
        !            93:        and.l           #$FF00FF,d1     ;clear all but aexcs and qbyte
        !            94:        bra.b           end_fix
        !            95: fmove_con:
        !            96:        and.l           #$0FFF40FF,d1   ;clear all but cc's, snan bit, aexcs, and qbyte
        !            97: end_fix:
        !            98:        move.l          d1,USER_FPSR(a6)
        !            99:
        !           100:        st              UFLG_TMP(a6)    ;set flag for unsupp data
        !           101:
        !           102:        bsr.l           get_op          ;everything okay, go get operand(s)
        !           103:        bsr.l           res_func        ;fix up stack frame so can restore it
        !           104:        clr.l           -(a7)
        !           105:        move.b          VER_TMP(a6),(a7) ;move idle fmt word to top of stack
        !           106:        bra.l           gen_except
        !           107: *
        !           108:        end