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