| commit | 2f8798ed071072dbb6801c5dbc5a4368cb5984e9 | [log] [tgz] |
|---|---|---|
| author | diaxu01 <dianhong.xu@arm.com> | Fri Sep 06 09:55:54 2019 +0000 |
| committer | Cherry Zhang <cherryyz@google.com> | Wed Mar 25 14:28:26 2020 +0000 |
| tree | 8cc6b2278d6dca0c4677e4dc3ac20e7b87f82073 | |
| parent | 91b8b130dda2c3a5933baee439e3fed1098e8318 [diff] |
cmd/internal/obj/arm64: add support of PCALIGN directive Recently, we get requirements of instructions and functions alignment from the gVisor project. To fit the alignment requirement of interrupt table, they require an instruction's address to be aligned 128 bytes and a function's entry address to be aligned 2K bytes. Thus we add support for PCALIGN directive first. Below is a discussion about this topic. https://groups.google.com/forum/m/#!topic/golang-dev/RPj90l5x86I Functions in Go are aligned to 16 bytes on arm64, thus now we only support 8 and 16 bytes alignment. This patch adds support for PCALIGN directive. This directive can be used within Go asm to align instruction by padding NOOP directives. This patch also adds a test to verify the correnctness of the PCALIGN directive. The test is contributed by Fannie Zhang <Fannie.Zhang@arm.com>. Change-Id: I709e6b94847fe9e1824f42f4155355f90c63d523 Reviewed-on: https://go-review.googlesource.com/c/go/+/207117 Reviewed-by: eric fang <eric.fang@arm.com> Reviewed-by: Cherry Zhang <cherryyz@google.com> Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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