[patch,avr] device specific instruction support for avr devices

Denis Chertykov chertykov@gmail.com
Tue Mar 25 17:07:00 GMT 2014


2014-03-24 12:23 GMT+04:00 S, Pitchumani <Pitchumani.S@atmel.com>:
>> -----Original Message-----
>> From: binutils-owner@sourceware.org [mailto:binutils-owner@sourceware.org]
>> On Behalf Of S, Pitchumani
>> Sent: Monday, March 03, 2014 11:21 AM
>> To: binutils@sourceware.org
>> Cc: chertykov@gmail.com
>> Subject: [patch,avr] device specific instruction support for avr devices
>>
>> Hi,
>>
>> Few AVR Xmega devices have specific instruction support than the
>> architecture
>> it belongs to. For example atxmega128b1 device has RMW instructions
>> (XCH,LAC,
>> LAS and LAT) support, but not all avrxmega6 devices have.
>>
>> Now, avr-gcc passes architecture name to assembler instead of device name.
>> So,
>> RMW instructions are not recognized (illegal opcode error) by assembler.
>>
>> I have attached a patch to address this issue in assembler.
>> - It adds a option '-mrmw' to assembler.
>> - Based on -mrmw option device specific instructions are added to current
>>   instruction set (mcu_types[i].isa | AVR_ISA_RMW)
>> Now assembler can recognize rmw instructions for respective devices.
>>
>> It is necessary to update gcc to pass -mrmw option to assembler if the
>> selected device has rmw instructions. I'll send a patch for gcc as well.
>>
>> Please review the attached patch and give your suggestions.
>
> Hi,
>
> I have updated the patch to include -mrmw option to binutils.

Where is the patch ?

Denis.



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