enhance dynamic linker to handle DT_RELR relocations #1345
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As this article https://maskray.me/blog/2021-10-31-relative-relocations-and-relr explains, the relocations of new type RELR help significantly compress the traditional RELA ones. More specifically, the new RELR section encodes information about relocations that merely need adding the base of the ELF object to a relative offset. The even entry encodes the location of the 1st symbol to be relocated. And the odd one encodes information about the subsequent symbols using a bitmap. For details look at the comments in the code. The implementation is loosely based on the Musl one - https://git.musl-libc.org/cgit/musl/commit/?id=d32dadd60efb9d3b255351a3b532f8e4c3dd0db1 Fixes cloudius-systems#1323 Signed-off-by: Waldemar Kozaczuk <[email protected]>
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As this article
https://maskray.me/blog/2021-10-31-relative-relocations-and-relr explains, the relocations of new type RELR help significantly compress the traditional RELA ones.
More specifically, the new RELR section encodes information about relocations that merely need adding the base of the ELF object to a relative offset. The even entry encodes the location of the 1st symbol to be relocated. And the odd one encodes information about the subsequent symbols using a bitmap. For details look at the comments in the code.
The implementation is loosely based on the Musl one - https://git.musl-libc.org/cgit/musl/commit/?id=d32dadd60efb9d3b255351a3b532f8e4c3dd0db1
Fixes #1323