insn_get_sib(9)

📦 version 7.3.1, in nixpkgs unstable

okay so bestie, welcome to insn_get_sib(9) — yes, that’s the Kernel API Manual page, and it’s lowkey iconic. Nobody panic: this is the “Get the SIB byte of instruction” moment, and we’re keeping every detail exactly where it belongs. 💅

🦋 NAME 🦋

insn_get_sib — Get the SIB byte of instruction. No cap, that’s the whole name vibe. ✨

✨ SYNOPSIS ✨

int insn_get_sib (struct insn *insn );

💖 ARGUMENTS 💖

  • insn — a struct insn containing instruction. Yes, bestie, that’s the instruction container, keep it close. 🫶

🌸 DESCRIPTION 🌸

If necessary, first collects the instruction up to and including the ModRM byte. That’s the move: it handles the “if necessary” part first, then goes up to and including ModRM. Literally doing the pre-work so the SIB byte can have its main character moment. 👑

🎀 RETURN 🎀

  • 0: if decoding succeeded.
  • < 0: otherwise.

So: 0 = slay, decoding succeeded; < 0 = not slay, otherwise. 💀✨

💅 SEE ALSO 💅

Kernel file ./tools/arch/x86/lib/insn.c — and the whole friend group: insn_init(9), insn_get_prefixes(9), insn_get_opcode(9), insn_get_modrm(9), insn_rip_relative(9), insn_get_displacement(9), insn_get_immediate(9), insn_get_length(9), insn_decode(9). Go say hi, iykyk. 🦋

Cute sign-off: source/version is ./tools/arch/x86/lib, dated October 2026, and this page is officially closed with a little sparkle. 🎀💖

📦 where this page comes from