LXR linux/arch/x86/lib/thunk

   1/*
   2 * Save registers before calling assembly functions. This avoids
   3 * disturbance of register allocation in some inline assembly constructs.
   4 * Copyright 2001,2002 by Andi Kleen, SuSE Labs.
   5 * Added trace_hardirqs callers - Copyright 2007 Steven Rostedt, Red Hat, Inc.
   6 * Subject to the GNU public license, v.2. No warranty of any kind.
   7 */
   8#include <linux/linkage.h>
   9#include <asm/dwarf2.h>
  10#include <asm/calling.h>
  11#include <asm/asm.h>
  12
  13        /* rdi: arg1 ... normal C conventions. rax is saved/restored. */
  14        .macro THUNK name, func, put_ret_addr_in_rdi=0
  15        .globl \name
  16\name:
  17        CFI_STARTPROC
  18
  19        /* this one pushes 9 elems, the next one would be %rIP */
  20        pushq_cfi_reg rdi
  21        pushq_cfi_reg rsi
  22        pushq_cfi_reg rdx
  23        pushq_cfi_reg rcx
  24        pushq_cfi_reg rax
  25        pushq_cfi_reg r8
  26        pushq_cfi_reg r9
  27        pushq_cfi_reg r10
  28        pushq_cfi_reg r11
  29
  30        .if \put_ret_addr_in_rdi
  31        /* 9*8(%rsp) is return addr on stack */
  32        movq_cfi_restore 9*8, rdi
  33        .endif
  34
  35        call \func
  36        jmp  restore
  37        CFI_ENDPROC
  38        _ASM_NOKPROBE(\name)
  39        .endm
  40
  41#ifdef CONFIG_TRACE_IRQFLAGS
  42        THUNK trace_hardirqs_on_thunk,trace_hardirqs_on_caller,1
  43        THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1
  44#endif
  45
  46#ifdef CONFIG_DEBUG_LOCK_ALLOC
  47        THUNK lockdep_sys_exit_thunk,lockdep_sys_exit
  48#endif
  49
  50#ifdef CONFIG_PREEMPT
  51        THUNK ___preempt_schedule, preempt_schedule
  52#ifdef CONFIG_CONTEXT_TRACKING
  53        THUNK ___preempt_schedule_context, preempt_schedule_context
  54#endif
  55#endif
  56
  57#if defined(CONFIG_TRACE_IRQFLAGS) \
  58 || defined(CONFIG_DEBUG_LOCK_ALLOC) \
  59 || defined(CONFIG_PREEMPT)
  60        CFI_STARTPROC
  61        CFI_ADJUST_CFA_OFFSET 9*8
  62restore:
  63        popq_cfi_reg r11
  64        popq_cfi_reg r10
  65        popq_cfi_reg r9
  66        popq_cfi_reg r8
  67        popq_cfi_reg rax
  68        popq_cfi_reg rcx
  69        popq_cfi_reg rdx
  70        popq_cfi_reg rsi
  71        popq_cfi_reg rdi
  72        ret
  73        CFI_ENDPROC
  74        _ASM_NOKPROBE(restore)
  75#endif
  76