我们如何在Apple平台的AArch64程序集中在一行中编写多条语句?

问题描述

我正在将一些 Arm64 汇编语言移植到 M1.

I'm porting a bit of Arm64 assembly language to an M1.

其中一些是由 C 预处理生成的，其中单个 #define 宏生成多个以分号分隔的语句.

Some of it is generated by C preprocessing, in which a single #define macro generates multiple statements separated by semicolon.

不幸的是，在 M1 上，汇编程序将分号视为注释字符.

Unfortunately, on the M1, the assembler treats the semicolon as a comment character.

例如:

#define DEFUN(NAME)  \
  .globl _ ## NAME ; \
  .palign 2 ;        \
  _ ## NAME:

导致 .globl 指令之后的所有内容都被视为注释.

causes everything after the .globl directive to be treated as a comment.

MacOS as 手册页没有提供任何线索；它没有涵盖语法.

The MacOS as man page provides no clue; it has no coverage of syntax.

是否有用于分隔语句的替代字符?我尝试使用 @ 和 !，但都被拒绝了.

Is there an alernative character for separating statements? I tried using @ and !, but both are rejected.

对这个问题的答案是在这里没用.

Answers to this question are of no use here.

推荐答案

对于面向 Apple 平台的 aarch64 程序集，您可以使用 %% 作为分隔符.不确定它是否/在哪里记录，但它设置在 LLVM 源 此处.即使它可能没有在任何地方明确记录，它也会在许多地方使用，例如在 libunwind 和 compiler-rt，所以它可能不会随心所欲地改变.

For aarch64 assembly targeting Apple platforms, you can use %% as separator character. Not sure if/where it's documented, but it's set in the LLVM source here. And even if it might not be documented explicitly anywhere, it is used in a number of places, e.g. in libunwind and compiler-rt, so it probably won't change in a whim.

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