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