dwarf_cfa_execute_insns(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dwarf_cfa_execute_insns(9) — straight from the Kernel API Manual, bestie

okay so picture this: you're deep in the kernel, sh architecture, and someone needs to know where the Canonical Frame Address of a stackframe is. that's the whole vibe of this function. it's giving "unwinder internals" and honestly? iconic. let's get into it 🫶

✨ NAME ✨

dwarf_cfa_execute_insns — literally runs instructions to calculate a CFA. that's it. that's the function. no cap.

🌸 SYNOPSIS 🌸

int dwarf_cfa_execute_insns (unsigned char *insn_start , unsigned char
*insn_end , struct dwarf_cie *cie , struct dwarf_fde *fde , struct
dwarf_frame *frame , unsigned long pc );

🎀 ARGUMENTS 🎀

  • insn_start — the address of the first instruction. where the whole little instruction party kicks off 💖
  • insn_end — the address of the last instruction. where the party wraps up ✨
  • cie — the CIE for this function. yes queen, the Common Information Entry, slay
  • fde — the FDE for this function. Frame Description Entry, also slay, they come as a pair fr fr
  • frame — the instructions calculate the CFA for this frame. that's the target, that's the main character 👑
  • pc — the program counter of the address we're interested in. which address? the one you care about, bestie 🔥

🦋 DESCRIPTION 🦋

okay so what this does is execute the Call Frame instruction sequence — starts at insn_start and ends at insn_end, exactly as advertised, no surprises.

and what are those instructions doing? they describe how to calculate the Canonical Frame Address of a stackframe. like, the instructions are literally the recipe and the CFA is the cake 🍓

and then — this is the part I'm obsessed with — it stores the results in frame. so frame comes in as your parameter and leaves holding the whole answer. glow-up arc, honestly 💅

🌈 SEE ALSO 🌈

Kernel file ./arch/sh/kernel/dwarf.c — go read it, iykyk 🧚

lowkey a whole dwarf-unwinder friend group in that list. bring snacks, read all of them, be thorough bestie 💀💜

that's the page!! shoutout to ./arch/sh/kernel for hosting this whole thing, October 2026 edition — version girlies, this one's for you 🎀⭐💖

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