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x86/alternatives: Update comments in int3_emulate_push()

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The idtentry macro in entry_64.S hasn't had a create_gap
option for 5 years - update the comment.

(Also clean up the entire comment block while at it.)

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250411054105.2341982-13-mingo@kernel.org
This commit is contained in:
Ingo Molnar 2025-04-11 07:40:24 +02:00
parent 762255b743
commit 5224f09a7b
1 changed files with 5 additions and 4 deletions
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9
arch/x86/include/asm/text-patching.h
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@ -142,13 +142,14 @@ static __always_inline
void int3_emulate_push(struct pt_regs *regs, unsigned long val)
{
/*
* The int3 handler in entry_64.S adds a gap between the
* The INT3 handler in entry_64.S adds a gap between the
* stack where the break point happened, and the saving of
* pt_regs. We can extend the original stack because of
* this gap. See the idtentry macro's create_gap option.
* this gap. See the idtentry macro's X86_TRAP_BP logic.
*
* Similarly entry_32.S will have a gap on the stack for (any) hardware
* exception and pt_regs; see FIXUP_FRAME.
* Similarly, entry_32.S will have a gap on the stack for
* (any) hardware exception and pt_regs; see the
* FIXUP_FRAME macro.
*/
regs->sp -= sizeof(unsigned long);
*(unsigned long *)regs->sp = val;