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76 lines
2.0 KiB
76 lines
2.0 KiB
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| x_unimp.sa 3.3 7/1/91 |
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| fpsp_unimp --- FPSP handler for unimplemented instruction |
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| exception. |
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| Invoked when the user program encounters a floating-point |
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| op-code that hardware does not support. Trap vector# 11 |
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| (See table 8-1 MC68030 User's Manual). |
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| Note: An fsave for an unimplemented inst. will create a short |
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| fsave stack. |
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| Input: 1. Six word stack frame for unimplemented inst, four word |
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| for illegal |
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| (See table 8-7 MC68030 User's Manual). |
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| 2. Unimp (short) fsave state frame created here by fsave |
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| instruction. |
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| Copyright (C) Motorola, Inc. 1990 |
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| All Rights Reserved |
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| For details on the license for this file, please see the |
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| file, README, in this same directory. |
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X_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package |
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|section 8 |
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#include "fpsp.h" |
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|xref get_op |
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|xref do_func |
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|xref sto_res |
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|xref gen_except |
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|xref fpsp_fmt_error |
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.global fpsp_unimp |
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.global uni_2 |
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fpsp_unimp: |
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link %a6,#-LOCAL_SIZE |
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fsave -(%a7) |
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uni_2: |
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moveml %d0-%d1/%a0-%a1,USER_DA(%a6) |
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fmovemx %fp0-%fp3,USER_FP0(%a6) |
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fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) |
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moveb (%a7),%d0 |test for valid version num |
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andib #0xf0,%d0 |test for $4x |
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cmpib #VER_4,%d0 |must be $4x or exit |
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bnel fpsp_fmt_error |
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| Temporary D25B Fix |
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| The following lines are used to ensure that the FPSR |
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| exception byte and condition codes are clear before proceeding |
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movel USER_FPSR(%a6),%d0 |
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andl #0xFF00FF,%d0 |clear all but accrued exceptions |
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movel %d0,USER_FPSR(%a6) |
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fmovel #0,%FPSR |clear all user bits |
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fmovel #0,%FPCR |clear all user exceptions for FPSP |
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clrb UFLG_TMP(%a6) |clr flag for unsupp data |
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bsrl get_op |go get operand(s) |
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clrb STORE_FLG(%a6) |
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bsrl do_func |do the function |
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fsave -(%a7) |capture possible exc state |
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tstb STORE_FLG(%a6) |
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bnes no_store |if STORE_FLG is set, no store |
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bsrl sto_res |store the result in user space |
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no_store: |
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bral gen_except |post any exceptions and return |
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|end
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