diff options
Diffstat (limited to 'c/src/lib/libcpu/m68k/m68040/fpsp/x_unsupp.S')
| -rw-r--r-- | c/src/lib/libcpu/m68k/m68040/fpsp/x_unsupp.S | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/m68k/m68040/fpsp/x_unsupp.S b/c/src/lib/libcpu/m68k/m68040/fpsp/x_unsupp.S new file mode 100644 index 0000000000..d1371d05f3 --- /dev/null +++ b/c/src/lib/libcpu/m68k/m68040/fpsp/x_unsupp.S @@ -0,0 +1,85 @@ +// +// $Id$ +// +// x_unsupp.sa 3.3 7/1/91 +// +// fpsp_unsupp --- FPSP handler for unsupported data type exception +// +// Trap vector #55 (See table 8-1 Mc68030 User's manual). +// Invoked when the user program encounters a data format (packed) that +// hardware does not support or a data type (denormalized numbers or un- +// normalized numbers). +// Normalizes denorms and unnorms, unpacks packed numbers then stores +// them back into the machine to let the 040 finish the operation. +// +// Unsupp calls two routines: +// 1. get_op - gets the operand(s) +// 2. res_func - restore the function back into the 040 or +// if fmove.p fpm,<ea> then pack source (fpm) +// and store in users memory <ea>. +// +// Input: Long fsave stack frame +// +// + +// Copyright (C) Motorola, Inc. 1990 +// All Rights Reserved +// +// THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA +// The copyright notice above does not evidence any +// actual or intended publication of such source code. + +X_UNSUPP: //idnt 2,1 | Motorola 040 Floating Point Software Package + + |section 8 + +#include "fpsp.defs" + + |xref get_op + |xref res_func + |xref gen_except + |xref fpsp_fmt_error + + .global fpsp_unsupp +fpsp_unsupp: +// + link %a6,#-LOCAL_SIZE + fsave -(%a7) + moveml %d0-%d1/%a0-%a1,USER_DA(%a6) + fmovemx %fp0-%fp3,USER_FP0(%a6) + fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) + + + moveb (%a7),VER_TMP(%a6) //save version number + moveb (%a7),%d0 //test for valid version num + andib #0xf0,%d0 //test for $4x + cmpib #VER_4,%d0 //must be $4x or exit + bnel fpsp_fmt_error + + fmovel #0,%FPSR //clear all user status bits + fmovel #0,%FPCR //clear all user control bits +// +// The following lines are used to ensure that the FPSR +// exception byte and condition codes are clear before proceeding, +// except in the case of fmove, which leaves the cc's intact. +// +unsupp_con: + movel USER_FPSR(%a6),%d1 + btst #5,CMDREG1B(%a6) //looking for fmove out + bne fmove_con + andl #0xFF00FF,%d1 //clear all but aexcs and qbyte + bras end_fix +fmove_con: + andl #0x0FFF40FF,%d1 //clear all but cc's, snan bit, aexcs, and qbyte +end_fix: + movel %d1,USER_FPSR(%a6) + + st UFLG_TMP(%a6) //set flag for unsupp data + + bsrl get_op //everything okay, go get operand(s) + bsrl res_func //fix up stack frame so can restore it + clrl -(%a7) + moveb VER_TMP(%a6),(%a7) //move idle fmt word to top of stack + bral gen_except +// + |end |