[PATCH] D58102: Support X86 Control-flow Enforcement Technology (CET) in LLD

Tue Feb 19 21:47:15 PST 2019

LuoYuanke added a comment.

Hi ruiu

It is better to have ABI discussion at https://groups.google.com/forum/#!forum/x86-64-abi or send email x86-64-abi at googlegroups.com. Could you join to discuss the ABI issue there? Below is some piece of discussion that I can search from the forum https://groups.google.com/forum/#!topic/x86-64-abi/nWA7tcnjPnk.

There are 2 reasons for this 2-PLT scheme:

1. Provide compatibility with other tools that have an hardcoded limit of 16

bytes for an x86 PLT entry.

2. Improve code cache locality: since most of the instructions in .plt would be

executed only the first time a symbol is resolved they would waste space in 
the cache and, by having a .plt.sec, only instructions that are often executed 
would be cached.

Thanks

Repository:
  rLLD LLVM Linker

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D58102/new/

https://reviews.llvm.org/D58102