msub_func(9)

💅 msub_func(9) — like, the Kernel API Manual page, bestie 🎀

okay so real talk, this is msub_func from the Kernel API Manual, and it's genuinely one of the chillest little functions you'll ever meet. no drama, no fail states, just vibes. let's get into it ✨

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🌸 NAME 🌸

msub_func — it emulates a MSUB instruction. that's it. that's the whole assignment. 💅

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✨ SYNOPSIS ✨

int msub_func (struct pt_regs *regs , u32 ir );

like, hand it your registers and an instruction and it just handles it. main character energy fr fr 👑

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🫶 ARGUMENTS 🫶

• regs — the process register set. the whole little outfit your process is wearing, state-wise. 💖
• ir — the instruction. the actual thing we're emulating. the moment. the assignment. ⭐

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🦋 DESCRIPTION 🦋

so here's the tea: it returns 0 because it always succeeds. no cap. it literally cannot fail, which honestly? iconic. we stan a function with zero anxiety. 🌈

like yes bestie, every single time, 0. that's the whole description. sometimes life is that simple and honestly good for it. 🍓

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👑 SEE ALSO 👑

the whole squad, no one left behind — mipsr6_emul(9), movf_func(9), movt_func(9), jr_func(9), movz_func(9), movn_func(9), mfhi_func(9), mthi_func(9), mflo_func(9), mtlo_func(9), mult_func(9), multu_func(9), div_func(9), divu_func(9), dmult_func(9), dmultu_func(9), ddiv_func(9), ddivu_func(9), madd_func(9), maddu_func(9), msubu_func(9), mul_func(9), clz_func(9), clo_func(9), dclz_func(9), dclo_func(9), mipsr2_decoder(9).

and lowkey the kernel file it lives in, which you should absolutely go read: ./arch/mips/kernel/mips-r2-to-r6-emul.c 🧚

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okay that's the page!! 💜 mwah, go emulate something, you got this.

sign-off time 🎀 — this one came out of ./arch/mips/kernel, dated October 2026, and it's the msub_func(9) page. take care of her, she always returns 0 for you. 🫶✨