[Bug ld/21472] New: [avr] Add new emulation for ATtiny416 et al.

[gjl at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=21472

            Bug ID: 21472
           Summary: [avr] Add new emulation for ATtiny416 et al.
           Product: binutils
           Version: 2.29 (HEAD)
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: gjl at gcc dot gnu.org
  Target Milestone: ---

WHilst the ISA of AVR ATtiny416 / 417 / 816 / 817 would fit avrxmega2, these
sevices feature the flash being accessible via the SRAM address range and
instructions.  This means that .rodata need not to be part of .data which is
the case for all other AVR devices (except avrtiny).

Using SRAM addresses for .rodata requires that such SRAM addresses are offset
by 0x8000 compared to the flash addresses as accessible by LPM, for example
like so:

__RODATA_PM_OFFSET__ = DEFINED(__RODATA_PM_OFFSET__) ? __RODATA_PM_OFFSET__ :
0x8000;


  .text   :
  {
     ...   
  }  > text
  .rodata ADDR(.text) + SIZEOF (.text) + __RODATA_PM_OFFSET__ :
  {
    *(.rodata)
    *(.rodata*)
    *(.gnu.linkonce.r*)
  } AT> text
  .data :
  {
     ...

Consequently, we want a new emulation to support that feature in an optimal
way.

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