0025535cac8d9fa389016d0b79b84519fab9a073
[linux-3.10.git] / arch / x86_64 / lib / thunk.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/config.h>
9         #include <linux/linkage.h>
10         #include <asm/dwarf2.h>
11         #include <asm/calling.h>                        
12         #include <asm/rwlock.h>
13                 
14         /* rdi: arg1 ... normal C conventions. rax is saved/restored. */        
15         .macro thunk name,func
16         .globl \name
17 \name:  
18         CFI_STARTPROC
19         SAVE_ARGS
20         call \func
21         jmp  restore
22         CFI_ENDPROC
23         .endm
24
25         /* rdi: arg1 ... normal C conventions. rax is passed from C. */         
26         .macro thunk_retrax name,func
27         .globl \name
28 \name:  
29         CFI_STARTPROC
30         SAVE_ARGS
31         call \func
32         jmp  restore_norax
33         CFI_ENDPROC
34         .endm
35         
36
37         .section .sched.text
38 #ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
39         thunk rwsem_down_read_failed_thunk,rwsem_down_read_failed
40         thunk rwsem_down_write_failed_thunk,rwsem_down_write_failed
41         thunk rwsem_wake_thunk,rwsem_wake
42         thunk rwsem_downgrade_thunk,rwsem_downgrade_wake
43 #endif  
44         
45         thunk __down_failed,__down
46         thunk_retrax __down_failed_interruptible,__down_interruptible
47         thunk_retrax __down_failed_trylock,__down_trylock
48         thunk __up_wakeup,__up
49
50 #ifdef CONFIG_TRACE_IRQFLAGS
51         thunk trace_hardirqs_on_thunk,trace_hardirqs_on
52         thunk trace_hardirqs_off_thunk,trace_hardirqs_off
53 #endif
54         
55         /* SAVE_ARGS below is used only for the .cfi directives it contains. */
56         CFI_STARTPROC
57         SAVE_ARGS
58 restore:
59         RESTORE_ARGS
60         ret     
61         CFI_ENDPROC
62         
63         CFI_STARTPROC
64         SAVE_ARGS
65 restore_norax:  
66         RESTORE_ARGS 1
67         ret
68         CFI_ENDPROC