Running V8 on ARM64 Windows?

[Thomson Tan]

For the new OS Windows 10 on ARM (based on ARMv8 64-bit instruction set), I am curious on what changes in V8 are needed to run it? I think V8's JIT could generate instructions for this processor because it is also used in many Android phones, what and where are the ABI requirements of V8?  Thanks.

[Ben Noordhuis]

Are you planning to port it to that platform? V8 uses an internal
calling convention in JIT-generated code. The only places where you
need to worry about the native calling convention is at the edges,
where generated code calls into native C++ code. Let me know if you
need more details.

[Thomson Tan]

Thanks Ben. Yes, I am experimenting port V8 to this platform. Would you please point me to the code which handles native code calling convention from JIT code?

BTW: I am Microsoft employee working on this new Windows platform.

[Ben Noordhuis]

On Fri, Apr 6, 2018 at 6:17 PM, Thomson Tan <lil...@gmail.com> wrote:
> Thanks Ben. Yes, I am experimenting port V8 to this platform. Would you
> please point me to the code which handles native code calling convention
> from JIT code?

Grep src/x64/code-stubs-x64.cc for '_WIN64' and you'll find it used in
methods like `CallApiCallbackStub::Generate()` and
`CallApiGetterStub::Generate()`.

The same methods in src/arm64/code-stubs-arm64.cc are likely the ones
you want - and if not, grep for 'CallApiFunctionAndReturn'.

[Rodolph Perfetta]

Hi,

The arm64 port follows the procedure call standard defined here: http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdf , I do not know if/how Windows on Arm differs. The main interface points are JSEntryStub, CEntryStub,and DirectCEntryStub (src/arm64/code-stub-arm64.cc). There are some other JS to C++ calls in TurboFan, look for the macro assembler function "CallCFunction" (used for calling Cos, Sin for example).

HTH,

Rodolph

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