sram_exec_copy(9)

🧚 sram_exec_copy(9) — the Kernel API Manual glow-up 💅

okay so bestie, welcome to the Kernel API Manual entry for sram_exec_copy — and no cap, this one is a whole vibe. it's the function that lets your sram driver be the main character in charge of protect-exec pools. let's get into it 💖

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✨ NAME ✨

sram_exec_copy — copy data to a protected executable region of sram 🎀

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🌸 SYNOPSIS 🌸

void * sram_exec_copy (struct gen_pool *pool , void *dst , void *src ,
size_t size );

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🦋 ARGUMENTS 🦋

• pool — the struct gen_pool you retrieved that is part of this sram, iykyk 🫶
• dst — destination address for the copy, and it must be inside pool (no sneaking out, bestie 💀)
• src — source address for the data to copy ✨
• size — size of copy to perform, which starting from dst, must reside in pool 🎯

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💜 RETURN 💜

the address for copied data that can safely be called through a function pointer 🎉 …or NULL if there's a problem 😭 (sad, but at least it tells you).

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🔥 DESCRIPTION 🔥

this helper function lets the sram driver act as the central control location of protect-exec pools 💅 and those are literally normal sram pools, but they're always set read-only and executable — except when data is being copied to them, at which point they get flipped to read-write non-executable. the whole point? making sure no memory is writeable and executable at the same time. periodt. 🛑

this region must be page-aligned, and that's checked during probe — otherwise page attribute manipulation would not be possible 🙈. also, care must be taken to only call the returned address, because dst address is not guaranteed to be safely callable. the way that matters, okay? ⚠️

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⭐ NOTE ⭐

this function uses the fncpy macro to move code to the executable region 👑. some architectures have strict requirements for relocating executable code, so fncpy is a macro that must be defined by any arch making use of this functionality, and it guarantees a safe copy of exec data and returns a safe address that can be called as a C function pointer 🧠✨. iconic behaviour honestly.

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/misc/sram-exec.c — go read it fr fr 📖

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that's the whole page bestie, you ate it up 🍓

mwah 💋 — this came from ./drivers/misc, dated October 2026, and it's the sram_exec_copy(9) entry in the Kernel API Manual. archive it in your brain, no cap 🎀✨