LXR linux/arch/x86/lib/thunk

   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
  52