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X-Spam-Status: No, score=-10.8 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H5, RCVD_IN_MSPIKE_WL, SPF_HELO_PASS, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+patchwork=sourceware.org@gcc.gnu.org https://gcc.gnu.org/gcc-14/changes.html#avr Johann --- supported + on all devices. Its defined to 0 or 1. + +

IA-32/x86-64

    diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html index 9c9dfa44..8c738683 100644 --- a/htdocs/gcc-14/changes.html +++ b/htdocs/gcc-14/changes.html @@ -342,7 +342,55 @@ a work-in-progress.

- +

AVR

+
    +
  • On AVR64* and AVR128* devices, read-only data is now located in program + memory per default and no more in RAM. +
      +
    • Only a 32 KiB block of program memory can be used to store + .rodata in that way. Which block is used can be selected by + defining symbol __flmap. + As an alternative, the byte address of the block can be specified + by symbol __RODATA_FLASH_START__ which takes + precedence over __flmap.
      • +
    • The default uses the last 32 KiB block, which is also the + hardware default for bit field NVMCTRL_CTRLB.FLMAP.
      • +
    • When a block other than the last 32 KiB block is used to store + .rodata, then NVMCTRL_CTRLB.FLMAP + must be initialized accordingly by hand, or a version of + AVR-LibC that implements #931 + must be used. The latter initializes NVMCTRL_CTRLB.FLMAP + in the startup code and according to the value + of __flmap resp. + __RODATA_FLASH_START__.
      • +
    • When AVR-LibC with #931 is used, then defining symbol + __flmap_lock to a non-zero value will set bit + NVMCTRL_CTRLB.FLMAPLOCK. This will protect + NVMCTRL_CTRLB.FLMAP from any further changes — + which would be Undefined Behaviour in C/C++.
      • +
    • In order to return to the old placement of read-only data in RAM, + the new compiler option -mrodata-in-ram can be used.
      • +
    • Read-only data is located in output section .rodata, + wheras it is part of .text when located in RAM.
      • +
    • The feature is only available when the compiler is configured + with a version of Binutils that implements + PR31124, which is the + case for Binutils v2.42 and up.
      • +
    +
    • +
  • A new compiler option -m[no]-rodata-in-ram has been added. + The default is to locate read-only data in program memory for devices that + support it, e.g. for AVR64* and AVR128* devices as explained above, + and for devices from the + avrxmega3 + and + avrtiny families. +
    • +
  • The new built-in macro __AVR_RODATA_IN_RAM__ is