Return to x_unsupp.sa CVS log

Up to [local] / sys / arch / m68k / fpsp

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

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