root/arch/alpha/lib/dbg_stackkill.S

   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
  30 1:      stq     $0, 0($2)
  31         addq    $2, 8, $2
  32         cmpult  $2, $30, $1
  33         bne     $1, 1b
  34 2:      ret     ($28)
  35 
  36         .end _mcount