Generic semaphore implementation
[linux-2.6.git] / 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  * Subject to the GNU public license, v.2. No warranty of any kind.
6  */
7
8         #include <linux/linkage.h>
9         #include <asm/dwarf2.h>
10         #include <asm/calling.h>                        
11         #include <asm/rwlock.h>
12                 
13         /* rdi: arg1 ... normal C conventions. rax is saved/restored. */        
14         .macro thunk name,func
15         .globl \name
16 \name:  
17         CFI_STARTPROC
18         SAVE_ARGS
19         call \func
20         jmp  restore
21         CFI_ENDPROC
22         .endm
23
24         /* rdi: arg1 ... normal C conventions. rax is passed from C. */         
25         .macro thunk_retrax name,func
26         .globl \name
27 \name:  
28         CFI_STARTPROC
29         SAVE_ARGS
30         call \func
31         jmp  restore_norax
32         CFI_ENDPROC
33         .endm
34         
35
36         .section .sched.text, "ax"
37 #ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
38         thunk rwsem_down_read_failed_thunk,rwsem_down_read_failed
39         thunk rwsem_down_write_failed_thunk,rwsem_down_write_failed
40         thunk rwsem_wake_thunk,rwsem_wake
41         thunk rwsem_downgrade_thunk,rwsem_downgrade_wake
42 #endif  
43         
44 #ifdef CONFIG_TRACE_IRQFLAGS
45         thunk trace_hardirqs_on_thunk,trace_hardirqs_on
46         thunk trace_hardirqs_off_thunk,trace_hardirqs_off
47 #endif
48
49 #ifdef CONFIG_DEBUG_LOCK_ALLOC
50         thunk lockdep_sys_exit_thunk,lockdep_sys_exit
51 #endif
52         
53         /* SAVE_ARGS below is used only for the .cfi directives it contains. */
54         CFI_STARTPROC
55         SAVE_ARGS
56 restore:
57         RESTORE_ARGS
58         ret     
59         CFI_ENDPROC
60         
61         CFI_STARTPROC
62         SAVE_ARGS
63 restore_norax:  
64         RESTORE_ARGS 1
65         ret
66         CFI_ENDPROC