Re: [PATCH v2 08/18] arm64: don't disable ADR_PREL_PG_HI21* with ARM64_ERRATUM_843419

Sami Tolvanen
2017-11-16T21:37:06Z

On Thu, Nov 16, 2017 at 04:34:03PM +0000, Ard Biesheuvel wrote:
> You still have not explained to us how GOLD avoids the erratum.

Sorry, I didn't realize you were asking that. If gold spots erratum
sequences, looks like it creates stubs to break them up:

https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gold/aarch64.cc#l8396

It also attempts to optimize the code by replacing adrps in these
sequences with adr where possible, but otherwise doesn't appear to
touch them:

https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gold/aarch64.cc#l2053

Sami