mirror of
https://github.com/marqs85/ossc
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96 lines
3.9 KiB
ArmAsm
96 lines
3.9 KiB
ArmAsm
/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2003-2005 Altera Corporation, San Jose, California, USA. *
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* All rights reserved. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the "Software"), *
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* to deal in the Software without restriction, including without limitation *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
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* and/or sell copies of the Software, and to permit persons to whom the *
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* Software is furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in *
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* all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
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* DEALINGS IN THE SOFTWARE. *
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* *
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* This agreement shall be governed in all respects by the laws of the State *
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* of California and by the laws of the United States of America. *
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* *
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******************************************************************************/
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/*
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* This is the trap exception handler for Nios2.
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*/
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/*
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* Provide a label which can be used to pull this file in.
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*/
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.section .exceptions.start
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.globl alt_exception_trap
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alt_exception_trap:
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/*
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* Pull in the entry/exit code.
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*/
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.globl alt_exception
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.section .exceptions.soft, "xa"
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.Ltrap_handler:
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/*
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* Did a trap instruction cause the exception?
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*
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* The instruction which the exception occurred on has been loaded
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* into r2 by code in alt_exception_entry.S
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*
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*/
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#ifdef ALT_CPU_CPU_ARCH_NIOS2_R2
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movhi r3,0xb41d /* upper half of trap opcode */
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ori r3,r3,0x0020 /* lower half of trap opcode */
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beq r2,r3,.Lis_trap
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#ifdef NIOS2_CDX_PRESENT
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mov r3,r2
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andhi r3,r3,0xffff
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ori r3,r3,0xd009 /* trap.n opcode */
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beq r2,r3,.Lis_trap
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#endif
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br .Lnot_trap
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#else
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movhi r3,0x003b /* upper half of trap opcode */
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ori r3,r3,0x683a /* lower half of trap opcode */
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bne r2,r3,.Lnot_trap
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#endif
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.Lis_trap:
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/*
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* There is no trap handler defined here, and so executing a trap
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* instruction causes a software break. If you provide a trap handler,
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* then you must replace the break instruction below with your handler.
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* Your handler must preserve ea and the usual callee saved registers.
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*/
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break
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br .Lexception_exit
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.Lnot_trap:
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.section .exceptions.exit.label
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.Lexception_exit:
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