STRUCT USER_REGSET_VIEW(9)

💅 struct user_regset_view(9) — the Kernel API Manual, bestie edition

okay so picture this: it's a Kernel API Manual page, and the whole vibe is "what regsets do we even have available rn" — welcome to struct user_regset_view, the little struct that holds the receipts 🎀

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✨ NAME ✨

struct user_regset_view — available regsets. that's it, that's the tweet 💖

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🌸 SYNOPSIS 🌸

struct user_regset_view {
    const char *name;
    const struct user_regset *regsets;
    unsigned int n;
    u32 e_flags;
    u16 e_machine;
    u8 ei_osabi;
 };

look at her. six fields. absolutely iconic. no cap, this is the whole layout, copy it exactly 👑

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🦋 Members 🦋

• name — the identifier, like, the UTS_MACHINE string. it's giving "who am I" energy 🪪
• regsets — an array of n regsets that are available in this view. it's a whole squad, not just one 💅
• n — the number of elements in regsets. yes bestie, the count is right there, no guessing 🧮
• e_flags — the ELF header e_flags value that gets written in core dumps 🗂️
• e_machine — the ELF header e_machine EM_* value that gets written in core dumps. note the EM_* — that's a whole family of values, not one thing ⭐
• ei_osabi — the ELF header e_ident[EI_OSABI] value that gets written in core dumps 🌈

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💜 Description 💜

so a regset view is, like, a collection of regsets (that's struct user_regset, the one above, iykyk). it describes all the state of a thread that can be seen from a given architecture/ABI environment. all of it. not a summary, a whole vibe check 🫶

and here's the lowkey wild part: more than one view might refer to the same struct user_regset, or more than one regset might refer to the same machine-specific state in the thread. it's not one-to-one, bestie, it's a whole friend group 👯

okay, actual example because this is the moment: a 32-bit thread's state could be examined from the 32-bit view or from the 64-bit view. either method reaches the same thread register state — just doing appropriate widening or truncation along the way. same state, different outfit 💅✨

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👑 SEE ALSO 👑

go read these, fr fr:

• Kernel file ./include/linux/regset.h
• user_regset_active_fn(9)
• user_regset_set_fn(9)
• user_regset_writeback_fn(9)
• struct user_regset(9)
• task_user_regset_view(9)
• copy_regset_from_user(9)

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and that's the page!! 🎀 source: ./include/linux, dated October 2026 — mwah, ty for reading, go look at some regsets bestie 💖🦋⭐