| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | | |
| Matt Waddel | e00d82d | 2006-02-11 17:55:48 -0800 | [diff] [blame] | 25 | | For details on the license for this file, please see the |
| 26 | | file, README, in this same directory. |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
| 28 | X_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package |
| 29 | |
| 30 | |section 8 |
| 31 | |
| 32 | #include "fpsp.h" |
| 33 | |
| 34 | |xref get_op |
| 35 | |xref do_func |
| 36 | |xref sto_res |
| 37 | |xref gen_except |
| 38 | |xref fpsp_fmt_error |
| 39 | |
| 40 | .global fpsp_unimp |
| 41 | .global uni_2 |
| 42 | fpsp_unimp: |
| 43 | link %a6,#-LOCAL_SIZE |
| 44 | fsave -(%a7) |
| 45 | uni_2: |
| 46 | moveml %d0-%d1/%a0-%a1,USER_DA(%a6) |
| 47 | fmovemx %fp0-%fp3,USER_FP0(%a6) |
| 48 | fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) |
| 49 | moveb (%a7),%d0 |test for valid version num |
| 50 | andib #0xf0,%d0 |test for $4x |
| 51 | cmpib #VER_4,%d0 |must be $4x or exit |
| 52 | bnel fpsp_fmt_error |
| 53 | | |
| 54 | | Temporary D25B Fix |
| 55 | | The following lines are used to ensure that the FPSR |
| 56 | | exception byte and condition codes are clear before proceeding |
| 57 | | |
| 58 | movel USER_FPSR(%a6),%d0 |
| 59 | andl #0xFF00FF,%d0 |clear all but accrued exceptions |
| 60 | movel %d0,USER_FPSR(%a6) |
| 61 | fmovel #0,%FPSR |clear all user bits |
| 62 | fmovel #0,%FPCR |clear all user exceptions for FPSP |
| 63 | |
| 64 | clrb UFLG_TMP(%a6) |clr flag for unsupp data |
| 65 | |
| 66 | bsrl get_op |go get operand(s) |
| 67 | clrb STORE_FLG(%a6) |
| 68 | bsrl do_func |do the function |
| 69 | fsave -(%a7) |capture possible exc state |
| 70 | tstb STORE_FLG(%a6) |
| 71 | bnes no_store |if STORE_FLG is set, no store |
| 72 | bsrl sto_res |store the result in user space |
| 73 | no_store: |
| 74 | bral gen_except |post any exceptions and return |
| 75 | |
| 76 | |end |