aarch64_insn_set(9)

💅 NAME 💅

okay so bestie, this is the aarch64_insn_set(9) page from the Kernel API Manual, and it is literally memset for RX memory regions. no cap. 💅

✨ SYNOPSIS ✨

noinstr void * aarch64_insn_set (void *dst , u32 insn , size_t len );

🎀 ARGUMENTS 🎀

• dst — the address to modify. that’s the spot you’re touching. 🫶
• insn — the value to set. the thing you’re putting there. ✨
• len — length of memory region. how much memory we’re talking about. 📏

🦋 DESCRIPTION 🦋

Useful for JITs to fill regions of RX memory with illegal instructions. that’s the vibe: JIT girlies use it to fill RX memory regions with illegal instructions. iconic behavior, honestly. 💀🔥

🌈 SEE ALSO 🌈

• Kernel file ./arch/arm64/kernel/patching.c
• aarch64_insn_copy(9)

later bestie 💖 — source/version is ./arch/arm64/kernel, dated October 2026. periodt. 👑