1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_LINKAGE_H
3 #define _LINUX_LINKAGE_H
4 
5 #include <linux/compiler_types.h>
6 #include <linux/stringify.h>
7 #include <linux/export.h>
8 #include <asm/linkage.h>
9 
10 /* Some toolchains use other characters (e.g. '`') to mark new line in macro */
11 #ifndef ASM_NL
12 #define ASM_NL		 ;
13 #endif
14 
15 #ifdef __cplusplus
16 #define CPP_ASMLINKAGE extern "C"
17 #else
18 #define CPP_ASMLINKAGE
19 #endif
20 
21 #ifndef asmlinkage
22 #define asmlinkage CPP_ASMLINKAGE
23 #endif
24 
25 #ifndef cond_syscall
26 #define cond_syscall(x)	asm(				\
27 	".weak " __stringify(x) "\n\t"			\
28 	".set  " __stringify(x) ","			\
29 		 __stringify(sys_ni_syscall))
30 #endif
31 
32 #ifndef SYSCALL_ALIAS
33 #define SYSCALL_ALIAS(alias, name) asm(			\
34 	".globl " __stringify(alias) "\n\t"		\
35 	".set   " __stringify(alias) ","		\
36 		  __stringify(name))
37 #endif
38 
39 #define __page_aligned_data	__section(.data..page_aligned) __aligned(PAGE_SIZE)
40 #define __page_aligned_bss	__section(.bss..page_aligned) __aligned(PAGE_SIZE)
41 
42 /*
43  * For assembly routines.
44  *
45  * Note when using these that you must specify the appropriate
46  * alignment directives yourself
47  */
48 #define __PAGE_ALIGNED_DATA	.section ".data..page_aligned", "aw"
49 #define __PAGE_ALIGNED_BSS	.section ".bss..page_aligned", "aw"
50 
51 /*
52  * This is used by architectures to keep arguments on the stack
53  * untouched by the compiler by keeping them live until the end.
54  * The argument stack may be owned by the assembly-language
55  * caller, not the callee, and gcc doesn't always understand
56  * that.
57  *
58  * We have the return value, and a maximum of six arguments.
59  *
60  * This should always be followed by a "return ret" for the
61  * protection to work (ie no more work that the compiler might
62  * end up needing stack temporaries for).
63  */
64 /* Assembly files may be compiled with -traditional .. */
65 #ifndef __ASSEMBLY__
66 #ifndef asmlinkage_protect
67 # define asmlinkage_protect(n, ret, args...)	do { } while (0)
68 #endif
69 #endif
70 
71 #ifndef __ALIGN
72 #define __ALIGN		.align 4,0x90
73 #define __ALIGN_STR	".align 4,0x90"
74 #endif
75 
76 #ifdef __ASSEMBLY__
77 
78 #ifndef LINKER_SCRIPT
79 #define ALIGN __ALIGN
80 #define ALIGN_STR __ALIGN_STR
81 
82 #ifndef ENTRY
83 #define ENTRY(name) \
84 	.globl name ASM_NL \
85 	ALIGN ASM_NL \
86 	name:
87 #endif
88 #endif /* LINKER_SCRIPT */
89 
90 #ifndef WEAK
91 #define WEAK(name)	   \
92 	.weak name ASM_NL   \
93 	name:
94 #endif
95 
96 #ifndef END
97 #define END(name) \
98 	.size name, .-name
99 #endif
100 
101 /* If symbol 'name' is treated as a subroutine (gets called, and returns)
102  * then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of
103  * static analysis tools such as stack depth analyzer.
104  */
105 #ifndef ENDPROC
106 #define ENDPROC(name) \
107 	.type name, @function ASM_NL \
108 	END(name)
109 #endif
110 
111 #endif
112 
113 #endif
114