cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dbg_stackkill.S (614B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * arch/alpha/lib/dbg_stackkill.S
      4 * Contributed by Richard Henderson (rth@cygnus.com)
      5 *
      6 * Clobber the balance of the kernel stack, hoping to catch
      7 * uninitialized local variables in the act.
      8 */
      9
     10#include <asm/asm-offsets.h>
     11
     12	.text
     13	.set noat
     14
     15	.align 5
     16	.globl _mcount
     17	.ent _mcount
     18_mcount:
     19	.frame $30, 0, $28, 0
     20	.prologue 0
     21
     22	ldi	$0, 0xdeadbeef
     23	lda	$2, -STACK_SIZE
     24	sll	$0, 32, $1
     25	and	$30, $2, $2
     26	or	$0, $1, $0
     27	lda	$2, TASK_SIZE($2)
     28	cmpult	$2, $30, $1
     29	beq	$1, 2f
     301:	stq	$0, 0($2)
     31	addq	$2, 8, $2
     32	cmpult	$2, $30, $1
     33	bne	$1, 1b
     342:	ret	($28)
     35
     36	.end _mcount