kernel/arch/x86/lib/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         #include <asm/dwarf2.h>
  10
  11         /* put return address in eax (arg1) */
  12         .macro THUNK name, func, put_ret_addr_in_eax=0
  13         .globl \name
  14 \name:
  15         CFI_STARTPROC
  16         pushl_cfi_reg eax
  17         pushl_cfi_reg ecx
  18         pushl_cfi_reg edx
  19
  20         .if \put_ret_addr_in_eax
  21         /* Place EIP in the arg1 */
  22         movl 3*4(%esp), %eax
  23         .endif
  24
  25         call \func
  26         popl_cfi_reg edx
  27         popl_cfi_reg ecx
  28         popl_cfi_reg eax
  29         ret
  30         CFI_ENDPROC
  31         _ASM_NOKPROBE(\name)
  32         .endm
  33
  34 #ifdef CONFIG_TRACE_IRQFLAGS
  35         THUNK trace_hardirqs_on_thunk,trace_hardirqs_on_caller,1
  36         THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1
  37 #endif
  38
  39 #ifdef CONFIG_PREEMPT
  40         THUNK ___preempt_schedule, preempt_schedule
  41 #ifdef CONFIG_CONTEXT_TRACKING
  42         THUNK ___preempt_schedule_context, preempt_schedule_context
  43 #endif
  44 #endif
  45