RFR: 8270517: Add Zero support for LoongArch

[Aleksey Shipilev]

On Thu, 15 Jul 2021 04:04:08 GMT, Ao Qi <aoqi at openjdk.org> wrote:

> LoongArch is a new RISC ISA. This issue proposes adding Zero support for LoongArch. Only 64-bit support is proposed at present.
> 
> linux-loongarch64-zero-{release, fastdebug} build tested:
> 
> $ ./build/linux-loongarch64-zero-fastdebug/jdk/bin/java -version
> openjdk version "18-internal" 2022-03-15
> OpenJDK Runtime Environment (fastdebug build 18-internal+0-adhoc.aoqi.jdk)
> OpenJDK 64-Bit Zero VM (fastdebug build 18-internal+0-adhoc.aoqi.jdk, interpreted mode)

Looks good for me (from Zero maintenance standpoint). A minor suggestion below.

src/hotspot/os/linux/os_linux.cpp line 1701:

> 1699:     {EM_AARCH64,     EM_AARCH64, ELFCLASS64, ELFDATA2LSB, (char*)"AARCH64"},
> 1700:     {EM_RISCV,       EM_RISCV,   ELFCLASS64, ELFDATA2LSB, (char*)"RISC-V"},
> 1701:     {EM_LOONGARCH,   EM_LOONGARCH,   ELFCLASS64, ELFDATA2LSB, (char*)"LoongArch"},

Suggestion:

    {EM_LOONGARCH,   EM_LOONGARCH, ELFCLASS64, ELFDATA2LSB, (char*)"LoongArch"},

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4787