arch/x86/lib/thunk_64.S

   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
  62 restore:
  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