RFR: 8248736: [aarch64] runtime/signal/TestSigpoll.java failed "fatal error: not an ldr (literal) instruction."

[Aleksey Shipilev]

On Fri, 27 Nov 2020 15:11:18 GMT, Stuart Monteith <smonteith at openjdk.org> wrote:

> Change mov to movptr in the nmethod entry barrier. movptr will generate a consistent number of mov/movk instructions that are necessary to consistently calculate the size of the nmethod barrier.

src/hotspot/cpu/aarch64/gc/shared/barrierSetAssembler_aarch64.cpp line 257:

> 255:   __ br(Assembler::EQ, skip);
> 256: 
> 257:   __ movptr(rscratch1, (uintptr_t) StubRoutines::aarch64::method_entry_barrier());

Looking how the rest of AArch64 code calls into external things, this might be:

 __ lea(rscratch1, ExternalAddress(StubRoutines::aarch64::method_entry_barrier()));

...which would end up doing the same (right) thing?

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PR: https://git.openjdk.java.net/jdk/pull/1481