tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 SAVE_ARGS
21
22 .if \put_ret_addr_in_rdi
23 movq_cfi_restore 9*8, rdi
24 .endif
25
26 call \func
27 jmp restore
28 CFI_ENDPROC
29 _ASM_NOKPROBE(\name)
30 .endm
31
32#ifdef CONFIG_TRACE_IRQFLAGS
33 THUNK trace_hardirqs_on_thunk,trace_hardirqs_on_caller,1
34 THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1
35#endif
36
37#ifdef CONFIG_DEBUG_LOCK_ALLOC
38 THUNK lockdep_sys_exit_thunk,lockdep_sys_exit
39#endif
40
41#ifdef CONFIG_PREEMPT
42 THUNK ___preempt_schedule, preempt_schedule
43#ifdef CONFIG_CONTEXT_TRACKING
44 THUNK ___preempt_schedule_context, preempt_schedule_context
45#endif
46#endif
47
48 /* SAVE_ARGS below is used only for the .cfi directives it contains. */
49 CFI_STARTPROC
50 SAVE_ARGS
51restore:
52 RESTORE_ARGS
53 ret
54 CFI_ENDPROC
55 _ASM_NOKPROBE(restore)