| 1 |
2 |
alfik |
/******************************************************************************
|
| 2 |
|
|
* *
|
| 3 |
|
|
* License Agreement *
|
| 4 |
|
|
* *
|
| 5 |
|
|
* Copyright (c) 2003-2005 Altera Corporation, San Jose, California, USA. *
|
| 6 |
|
|
* All rights reserved. *
|
| 7 |
|
|
* *
|
| 8 |
|
|
* Permission is hereby granted, free of charge, to any person obtaining a *
|
| 9 |
|
|
* copy of this software and associated documentation files (the "Software"), *
|
| 10 |
|
|
* to deal in the Software without restriction, including without limitation *
|
| 11 |
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
|
| 12 |
|
|
* and/or sell copies of the Software, and to permit persons to whom the *
|
| 13 |
|
|
* Software is furnished to do so, subject to the following conditions: *
|
| 14 |
|
|
* *
|
| 15 |
|
|
* The above copyright notice and this permission notice shall be included in *
|
| 16 |
|
|
* all copies or substantial portions of the Software. *
|
| 17 |
|
|
* *
|
| 18 |
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
|
| 19 |
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
|
| 20 |
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
|
| 21 |
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
|
| 22 |
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
|
| 23 |
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
|
| 24 |
|
|
* DEALINGS IN THE SOFTWARE. *
|
| 25 |
|
|
* *
|
| 26 |
|
|
* This agreement shall be governed in all respects by the laws of the State *
|
| 27 |
|
|
* of California and by the laws of the United States of America. *
|
| 28 |
|
|
* *
|
| 29 |
|
|
******************************************************************************/
|
| 30 |
|
|
|
| 31 |
|
|
/*
|
| 32 |
|
|
* This is the trap exception handler for Nios2.
|
| 33 |
|
|
*/
|
| 34 |
|
|
|
| 35 |
|
|
/*
|
| 36 |
|
|
* Provide a label which can be used to pull this file in.
|
| 37 |
|
|
*/
|
| 38 |
|
|
|
| 39 |
|
|
.section .exceptions.start
|
| 40 |
|
|
.globl alt_exception_trap
|
| 41 |
|
|
alt_exception_trap:
|
| 42 |
|
|
|
| 43 |
|
|
/*
|
| 44 |
|
|
* Pull in the entry/exit code.
|
| 45 |
|
|
*/
|
| 46 |
|
|
.globl alt_exception
|
| 47 |
|
|
|
| 48 |
|
|
.section .exceptions.soft, "xa"
|
| 49 |
|
|
|
| 50 |
|
|
.Ltrap_handler:
|
| 51 |
|
|
|
| 52 |
|
|
/*
|
| 53 |
|
|
* Did a trap instruction cause the exception?
|
| 54 |
|
|
*
|
| 55 |
|
|
* The instruction which the exception occurred on has been loaded
|
| 56 |
|
|
* into r2 by code in alt_exception_entry.S
|
| 57 |
|
|
*
|
| 58 |
|
|
*/
|
| 59 |
|
|
|
| 60 |
|
|
movhi r3,0x003b /* upper half of trap opcode */
|
| 61 |
|
|
ori r3,r3,0x683a /* lower half of trap opcode */
|
| 62 |
|
|
bne r2,r3,.Lnot_trap
|
| 63 |
|
|
|
| 64 |
|
|
/*
|
| 65 |
|
|
* There is no trap handler defined here, and so executing a trap
|
| 66 |
|
|
* instruction causes a software break. If you provide a trap handler,
|
| 67 |
|
|
* then you must replace the break instruction below with your handler.
|
| 68 |
|
|
* Your handler must preserve ea and the usual callee saved registers.
|
| 69 |
|
|
*/
|
| 70 |
|
|
|
| 71 |
|
|
break
|
| 72 |
|
|
|
| 73 |
|
|
br .Lexception_exit
|
| 74 |
|
|
|
| 75 |
|
|
.Lnot_trap:
|
| 76 |
|
|
|
| 77 |
|
|
|
| 78 |
|
|
.section .exceptions.exit.label
|
| 79 |
|
|
.Lexception_exit:
|
| 80 |
|
|
|
| 81 |
|
|
|
