arch/x86/entry/thunk_64.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Save registers before calling assembly functions. This avoids
   4  * disturbance of register allocation in some inline assembly constructs.
   5  * Copyright 2001,2002 by Andi Kleen, SuSE Labs.
   6  */
   7 #include <linux/export.h>
   8 #include <linux/linkage.h>
   9 #include "calling.h"
  10 #include <asm/asm.h>
  11
  12         /* rdi: arg1 ... normal C conventions. rax is saved/restored. */
  13         .macro THUNK name, func
  14 SYM_FUNC_START(\name)
  15         pushq %rbp
  16         movq %rsp, %rbp
  17
  18         pushq %rdi
  19         pushq %rsi
  20         pushq %rdx
  21         pushq %rcx
  22         pushq %rax
  23         pushq %r8
  24         pushq %r9
  25         pushq %r10
  26         pushq %r11
  27
  28         call \func
  29
  30         popq %r11
  31         popq %r10
  32         popq %r9
  33         popq %r8
  34         popq %rax
  35         popq %rcx
  36         popq %rdx
  37         popq %rsi
  38         popq %rdi
  39         popq %rbp
  40         RET
  41 SYM_FUNC_END(\name)
  42         _ASM_NOKPROBE(\name)
  43         .endm
  44
  45 THUNK preempt_schedule_thunk, preempt_schedule
  46 THUNK preempt_schedule_notrace_thunk, preempt_schedule_notrace
  47 EXPORT_SYMBOL(preempt_schedule_thunk)
  48 EXPORT_SYMBOL(preempt_schedule_notrace_thunk)