arch/x86/entry/thunk_32.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Trampoline to trace irqs off. (otherwise CALLER_ADDR1 might crash)
   4  * Copyright 2008 by Steven Rostedt, Red Hat, Inc
   5  *  (inspired by Andi Kleen's thunk_64.S)
   6  */
   7         #include <linux/linkage.h>
   8         #include <asm/asm.h>
   9         #include <asm/export.h>
  10
  11         /* put return address in eax (arg1) */
  12         .macro THUNK name, func, put_ret_addr_in_eax=0
  13 SYM_CODE_START_NOALIGN(\name)
  14         pushl %eax
  15         pushl %ecx
  16         pushl %edx
  17
  18         .if \put_ret_addr_in_eax
  19         /* Place EIP in the arg1 */
  20         movl 3*4(%esp), %eax
  21         .endif
  22
  23         call \func
  24         popl %edx
  25         popl %ecx
  26         popl %eax
  27         ret
  28         _ASM_NOKPROBE(\name)
  29 SYM_CODE_END(\name)
  30         .endm
  31
  32 #ifdef CONFIG_PREEMPTION
  33         THUNK preempt_schedule_thunk, preempt_schedule
  34         THUNK preempt_schedule_notrace_thunk, preempt_schedule_notrace
  35         EXPORT_SYMBOL(preempt_schedule_thunk)
  36         EXPORT_SYMBOL(preempt_schedule_notrace_thunk)
  37 #endif
  38