kernel/arch/x86/entry/thunk_32.S

   1 /*
   2  * Trampoline to trace irqs off. (otherwise CALLER_ADDR1 might crash)
   3  * Copyright 2008 by Steven Rostedt, Red Hat, Inc
   4  *  (inspired by Andi Kleen's thunk_64.S)
   5  * Subject to the GNU public license, v.2. No warranty of any kind.
   6  */
   7         #include <linux/linkage.h>
   8         #include <asm/asm.h>
   9
  10         /* put return address in eax (arg1) */
  11         .macro THUNK name, func, put_ret_addr_in_eax=0
  12         .globl \name
  13 \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         .endm
  30
  31 #ifdef CONFIG_TRACE_IRQFLAGS
  32         THUNK trace_hardirqs_on_thunk,trace_hardirqs_on_caller,1
  33         THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1
  34 #endif
  35
  36 #ifdef CONFIG_PREEMPT
  37         THUNK ___preempt_schedule, preempt_schedule
  38         THUNK ___preempt_schedule_notrace, preempt_schedule_notrace
  39 #endif
  40