[patch,avr] device specific instruction support for avr devices
Mon Mar 24 08:23:00 GMT 2014
> -----Original Message-----
> From: email@example.com [mailto:firstname.lastname@example.org]
> On Behalf Of S, Pitchumani
> Sent: Monday, March 03, 2014 11:21 AM
> To: email@example.com
> Cc: firstname.lastname@example.org
> Subject: [patch,avr] device specific instruction support for avr devices
> Few AVR Xmega devices have specific instruction support than the
> it belongs to. For example atxmega128b1 device has RMW instructions
> LAS and LAT) support, but not all avrxmega6 devices have.
> Now, avr-gcc passes architecture name to assembler instead of device name.
> 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.
I have updated the patch to include -mrmw option to binutils.
Patch for gcc update submitted in avr-gcc list.
2014-03-24 Pitchumani Sivanupandi <email@example.com>
* config/tc-avr.c: Add specified_mcu variable for selected mcu.
(enum options): add OPTION_ISA_RMW for -mrmw option.
(struct option md_longopts): Add mrmw option.
(md_show_usage): add -mrmw option description.
(md_parse_option): Update isa details if -mrmw option specified.
* doc/c-avr.texi: Add doc for new option -mrmw.
2014-02-25 Pitchumani Sivanupandi <firstname.lastname@example.org>
* gas/avr/avr.exp: Run new tests.
* gas/avr/rmw.d: Add test for additional ISA support.
* gas/avr/rmw.s: Ditto.
More information about the Binutils