1 #ifndef _LINUX_LINKAGE_H
2 #define _LINUX_LINKAGE_H
3 
4 #include <linux/compiler.h>
5 #include <asm/linkage.h>
6 
7 #ifdef __cplusplus
8 #define CPP_ASMLINKAGE extern "C"
9 #else
10 #define CPP_ASMLINKAGE
11 #endif
12 
13 #ifndef asmlinkage
14 #define asmlinkage CPP_ASMLINKAGE
15 #endif
16 
17 #define __page_aligned_data	__section(.data..page_aligned) __aligned(PAGE_SIZE)
18 #define __page_aligned_bss	__section(.bss..page_aligned) __aligned(PAGE_SIZE)
19 
20 /*
21  * For assembly routines.
22  *
23  * Note when using these that you must specify the appropriate
24  * alignment directives yourself
25  */
26 #define __PAGE_ALIGNED_DATA	.section ".data..page_aligned", "aw"
27 #define __PAGE_ALIGNED_BSS	.section ".bss..page_aligned", "aw"
28 
29 /*
30  * This is used by architectures to keep arguments on the stack
31  * untouched by the compiler by keeping them live until the end.
32  * The argument stack may be owned by the assembly-language
33  * caller, not the callee, and gcc doesn't always understand
34  * that.
35  *
36  * We have the return value, and a maximum of six arguments.
37  *
38  * This should always be followed by a "return ret" for the
39  * protection to work (ie no more work that the compiler might
40  * end up needing stack temporaries for).
41  */
42 /* Assembly files may be compiled with -traditional .. */
43 #ifndef __ASSEMBLY__
44 #ifndef asmlinkage_protect
45 # define asmlinkage_protect(n, ret, args...)	do { } while (0)
46 #endif
47 #endif
48 
49 #ifndef __ALIGN
50 #define __ALIGN		.align 4,0x90
51 #define __ALIGN_STR	".align 4,0x90"
52 #endif
53 
54 #ifdef __ASSEMBLY__
55 
56 #ifndef LINKER_SCRIPT
57 #define ALIGN __ALIGN
58 #define ALIGN_STR __ALIGN_STR
59 
60 #ifndef ENTRY
61 #define ENTRY(name) \
62   .globl name; \
63   ALIGN; \
64   name:
65 #endif
66 #endif /* LINKER_SCRIPT */
67 
68 #ifndef WEAK
69 #define WEAK(name)	   \
70 	.weak name;	   \
71 	name:
72 #endif
73 
74 #ifndef END
75 #define END(name) \
76   .size name, .-name
77 #endif
78 
79 /* If symbol 'name' is treated as a subroutine (gets called, and returns)
80  * then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of
81  * static analysis tools such as stack depth analyzer.
82  */
83 #ifndef ENDPROC
84 #define ENDPROC(name) \
85   .type name, @function; \
86   END(name)
87 #endif
88 
89 #endif
90 
91 #endif
92