aarch64memo

aarch64 memo

• Reference: Arm Architecture Reference Manual for A-profile architecture

• Releases · ARM-software/abi-aa

  • abi-aa/aapcs64.rst at main · ARM-software/abi-aa

• Writing ARM64 Code for Apple Platforms | Apple Developer Documentation Mac向け

• Arm64(ARMv8) Assembly Programming (00)

Mnemonic

• mov dst, src : dst <- src
• ldr dst, src : dst <- src
• str src, dst : src -> dst
• add dst, opr1, opr2 : dst <- opr1 + opr2

Registers

• X0~X30
• X31 = SP or XZR(Zero register)
• X30 = Procedure link register (Return address)
• X29 = Frame Pointer

Calling conventions

Calling convention # ARM(A64) - Wikipedia

Regs.	Purpose
X0~X7	Function parameters
X9~X15	Local variables: (Caller save)
X19~X29	Callee save
X29	Frame pointer (FP)
X30	Procedure link register (LR)
X31	Stack pointer (SP)

構造体引数

• 構造体が格納されているアドレスをレジスタで渡してるっぽい

構造体戻り値

• x8に格納先アドレスを渡してるっぽい

Appple M1

Variaic function parameters: 常にスタック経由で渡される。

Addressing Architectural Differences in Your macOS Code | Apple Developer Documentation

Don’t Redeclare a Function to Have Variable Parameters

... On arm64, the compiler always places variadic parameters on the stack, regardless of whether registers are available.

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