projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | | |
| 2 | | x_unimp.sa 3.3 7/1/91 | |
| 3 | | | |
| 4 | | fpsp_unimp --- FPSP handler for unimplemented instruction | |
| 5 | | exception. | |
| 6 | | | |
| 7 | | Invoked when the user program encounters a floating-point | |
| 8 | | op-code that hardware does not support. Trap vector# 11 | |
| 9 | | (See table 8-1 MC68030 User's Manual). | |
| 10 | | | |
| 11 | | | |
| 12 | | Note: An fsave for an unimplemented inst. will create a short | |
| 13 | | fsave stack. | |
| 14 | | | |
| 15 | | Input: 1. Six word stack frame for unimplemented inst, four word | |
| 16 | | for illegal | |
| 17 | | (See table 8-7 MC68030 User's Manual). | |
| 18 | | 2. Unimp (short) fsave state frame created here by fsave | |
| 19 | | instruction. | |
| 20 | | | |
| 21 | | | |
| 22 | | Copyright (C) Motorola, Inc. 1990 | |
| 23 | | All Rights Reserved | |
| 24 | | | |
| 25 | | THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA | |
| 26 | | The copyright notice above does not evidence any | |
| 27 | | actual or intended publication of such source code. | |
| 28 | ||
| 29 | X_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package | |
| 30 | ||
| 31 | |section 8 | |
| 32 | ||
| 33 | #include "fpsp.h" | |
| 34 | ||
| 35 | |xref get_op | |
| 36 | |xref do_func | |
| 37 | |xref sto_res | |
| 38 | |xref gen_except | |
| 39 | |xref fpsp_fmt_error | |
| 40 | ||
| 41 | .global fpsp_unimp | |
| 42 | .global uni_2 | |
| 43 | fpsp_unimp: | |
| 44 | link %a6,#-LOCAL_SIZE | |
| 45 | fsave -(%a7) | |
| 46 | uni_2: | |
| 47 | moveml %d0-%d1/%a0-%a1,USER_DA(%a6) | |
| 48 | fmovemx %fp0-%fp3,USER_FP0(%a6) | |
| 49 | fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) | |
| 50 | moveb (%a7),%d0 |test for valid version num | |
| 51 | andib #0xf0,%d0 |test for $4x | |
| 52 | cmpib #VER_4,%d0 |must be $4x or exit | |
| 53 | bnel fpsp_fmt_error | |
| 54 | | | |
| 55 | | Temporary D25B Fix | |
| 56 | | The following lines are used to ensure that the FPSR | |
| 57 | | exception byte and condition codes are clear before proceeding | |
| 58 | | | |
| 59 | movel USER_FPSR(%a6),%d0 | |
| 60 | andl #0xFF00FF,%d0 |clear all but accrued exceptions | |
| 61 | movel %d0,USER_FPSR(%a6) | |
| 62 | fmovel #0,%FPSR |clear all user bits | |
| 63 | fmovel #0,%FPCR |clear all user exceptions for FPSP | |
| 64 | ||
| 65 | clrb UFLG_TMP(%a6) |clr flag for unsupp data | |
| 66 | ||
| 67 | bsrl get_op |go get operand(s) | |
| 68 | clrb STORE_FLG(%a6) | |
| 69 | bsrl do_func |do the function | |
| 70 | fsave -(%a7) |capture possible exc state | |
| 71 | tstb STORE_FLG(%a6) | |
| 72 | bnes no_store |if STORE_FLG is set, no store | |
| 73 | bsrl sto_res |store the result in user space | |
| 74 | no_store: | |
| 75 | bral gen_except |post any exceptions and return | |
| 76 | ||
| 77 | |end |