insn_get_immediate(9)

✨ insn_get_immediate ✨

okay bestie, welcome to the kernel API manual for insn_get_immediate 💅 this one lives in the insn(9) family of pages, and it's genuinely so useful — let's get into it 🫶

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🌸 NAME 🌸

insn_get_immediate — get the immediate in an instruction 💖

✨ SYNOPSIS ✨

int insn_get_immediate (struct insn *insn );

🎀 ARGUMENTS 🎀

• insn — the struct insn that's holding your instruction 👑

🦋 DESCRIPTION 🦋

So here's the vibe: if it's necessary, this bad boy first collects the instruction up to and including the displacement bytes ✨ lowkey an important detail, don't skip it.

Basically? Most of the immediates are sign-expanded — that's just how it is, no cap 💅

And if you want the unsigned value, you can compute it by bit masking with this iconic little expression:

((1 << (nbytes * 8)) - 1)

that's literally it, she ate 🍓

🔥 RETURN 🔥

• 0 — on success 🎉
• < 0 — on error 😭

🌈 SEE ALSO 🌈

This one's part of a whole friend group, iykyk — go check out the Kernel file ./tools/arch/x86/lib/insn.c and also, like, all of these:

• insn_init(9)
• insn_get_prefixes(9)
• insn_get_opcode(9)
• insn_get_modrm(9)
• insn_rip_relative(9)
• insn_get_sib(9)
• insn_get_displacement(9)
• insn_get_length(9)
• insn_decode(9)

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mwah 💋 this page is brought to you by ./tools/arch/x86/lib, dated October 2026, and it's the insn_get_immediate(9) kernel API manual — go read the whole squad, they're all iconic 👑