[PATCH v1 0/5 Add support for CRC64 generation in linker

[Ulf Samuelsson]

Checked this, and realized that there were a lot of white space fixes 
needed.

I have done them, but I will wait for feedback before resend.

Best Regards.

Ulf Samuelsson


Den 2023-02-17 kl. 14:54, skrev Ulf Samuelsson via Binutils:
> Here is the first patchset for introducing CRC64 generation in the linker
>
> Supports the following new linker commands:
> * CRC64 ECMA                     '(' crc_start ',' crc_end ')'
> * CRC64 ISO                      '(' crc_start ',' crc_end ')'
> * CRC64 POLY  '[' mustbe_exp ']' '(' crc_start ',' crc_end ')'
> * CRC64 POLYI '[' mustbe_exp ']' '(' crc_start ',' crc_end ')'
> * CRC64 TABLE
>
> ECMA  == 0x42F0E1EBA9EA3693
> ISO   == 0xD800000000000000
> POLY  == Allows your own polynome
> POLYI == Allows your own polynome, with inversion during calc
>
> The CRC is calculated from crc_start to crc_end (not included)
>
> The "CRC64 <polynome> command
> * Allows specifying the polynom (ECMA(default), ISO or your own)
> * Allows for inversion in the CRC calculation (CRC64-WE)
> * Allows specifying the area that should be checked.
> * reserves room for the CRC (8 bytes)
> * Declares a symbol ___CRC64___ for the address of the CRC.
> * Declares a symbol ___CRC64_START___ for the first address of the checked area
> * Declares a symbol ___CRC64_END___ for the first address after the checked area
>
> The symbols names are declared in "checksum.h".
> If the names are unsuitable, it is easy to change.
>
> The CRC TABLE command
>    This is used to speed up the CRC calculation.
> * Creates a 2kB table which speeds up the CRC calculation
> * Can insert the 2kB table into the .text section at current location.
> * Declares a symbol ___CRC64_TABLE___ if the table is inserted.
>
> Comments on the code:
> This version also supports the
> * DEBUG ON
> * DEBUG OFF
> turning on/off yydebug
> I find it useful for debugging the build, but it can easly be removed.
>
> This patch contains a lot of debug output, that is enabled by
> #define DEBUG_CRC 1
> This should be removed in the final version.
>
> The ld.texi stuff needs some more work. Not very experienced with that.
>
> Added an entry in NEWS
>
> Added 4 test cases for the different CRC64 polynome commands.
> All testcases generate a CRC table.
>
> The code is using the libcrc released under an MIT license found in
> * https://www.libcrc.org/
> * https://github.com/lammertb/libcrc/tree/v2.0
> Author:  Lammert Bies
> A license for libcrc is added to the patch.
>
> [PATCH v1 1/5] ldlex.l: CRC64
> [PATCH v1 2/5] ldgram.y: CRC64
> [PATCH v1 3/5] Calculate CRC64 over the .text area
> [PATCH v1 4/5] CRC64 commands documentation
> [PATCH v1 5/5] CRC64 testsuite
>