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 %eax
  17         CFI_REL_OFFSET eax, 0
  18         pushl_cfi %ecx
  19         CFI_REL_OFFSET ecx, 0
  20         pushl_cfi %edx
  21         CFI_REL_OFFSET edx, 0
  22
  23         .if \put_ret_addr_in_eax
  24         /* Place EIP in the arg1 */
  25         movl 3*4(%esp), %eax
  26         .endif
  27
  28         call \func
  29         popl_cfi %edx
  30         CFI_RESTORE edx
  31         popl_cfi %ecx
  32         CFI_RESTORE ecx
  33         popl_cfi %eax
  34         CFI_RESTORE eax
  35         ret
  36         CFI_ENDPROC
  37         _ASM_NOKPROBE(\name)
  38         .endm
  39
  40 #ifdef CONFIG_TRACE_IRQFLAGS
  41         THUNK trace_hardirqs_on_thunk,trace_hardirqs_on_caller,1
  42         THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1
  43 #endif
  44
  45 #ifdef CONFIG_PREEMPT
  46         THUNK ___preempt_schedule, preempt_schedule
  47 #ifdef CONFIG_CONTEXT_TRACKING
  48         THUNK ___preempt_schedule_context, preempt_schedule_context
  49 #endif
  50 #endif
  51