LC

ARM Function Calling Conventions

medium4/10

Loops and Conditional Branches in ARM Implement memcpy in ARM Assembly

Language

Compiler

2.0s Limit 256MB

Implementation

Implement ARM functions following proper calling conventions.

Requirements:

Implement add function that takes two arguments
Use X0 for first argument and return value
Use X1 for second argument
Use BL to call function
Properly preserve callee-saved registers if needed

Why This Matters

AAPCS64 — arguments in x0-x7, return in x0 — is the contract behind every function call on iOS, Android, and Graviton servers; JNI, Swift interop, and kernel syscalls all obey it. Apple's arm64e variant adds pointer authentication on top, making this ABI actively security-relevant.

Hints

0 / 3 revealed

Validation Suite

main.c

Workspace 1.0