Linux 2.6.25-rc4
[linux-2.6/next.git] / arch / x86 / lib / thunk_64.S
blob8b92d428ab028833e7f21725302e9303347df73a
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  */
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
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         
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         thunk __down_failed,__down
45         thunk_retrax __down_failed_interruptible,__down_interruptible
46         thunk_retrax __down_failed_trylock,__down_trylock
47         thunk __up_wakeup,__up
49 #ifdef CONFIG_TRACE_IRQFLAGS
50         thunk trace_hardirqs_on_thunk,trace_hardirqs_on
51         thunk trace_hardirqs_off_thunk,trace_hardirqs_off
52 #endif
54 #ifdef CONFIG_DEBUG_LOCK_ALLOC
55         thunk lockdep_sys_exit_thunk,lockdep_sys_exit
56 #endif
57         
58         /* SAVE_ARGS below is used only for the .cfi directives it contains. */
59         CFI_STARTPROC
60         SAVE_ARGS
61 restore:
62         RESTORE_ARGS
63         ret     
64         CFI_ENDPROC
65         
66         CFI_STARTPROC
67         SAVE_ARGS
68 restore_norax:  
69         RESTORE_ARGS 1
70         ret
71         CFI_ENDPROC