1 #ifndef _LINUX_LINKAGE_H 2 #define _LINUX_LINKAGE_H 3 4 #include <linux/compiler.h> 5 #include <linux/stringify.h> 6 #include <asm/linkage.h> 7 8 #ifdef __cplusplus 9 #define CPP_ASMLINKAGE extern "C" 10 #else 11 #define CPP_ASMLINKAGE 12 #endif 13 14 #ifndef asmlinkage 15 #define asmlinkage CPP_ASMLINKAGE 16 #endif 17 18 #ifndef SYMBOL_NAME 19 #ifdef CONFIG_SYMBOL_PREFIX 20 #define SYMBOL_NAME(x) CONFIG_SYMBOL_PREFIX ## x 21 #else 22 #define SYMBOL_NAME(x) x 23 #endif 24 #endif 25 #define __SYMBOL_NAME(x) __stringify(SYMBOL_NAME(x)) 26 27 #ifndef cond_syscall 28 #define cond_syscall(x) asm(".weak\t" __SYMBOL_NAME(x) \ 29 "\n\t.set\t" __SYMBOL_NAME(x) "," __SYMBOL_NAME(sys_ni_syscall)); 30 #endif 31 32 #ifndef SYSCALL_ALIAS 33 #define SYSCALL_ALIAS(alias, name) \ 34 asm ("\t.globl " __SYMBOL_NAME(alias) \ 35 "\n\t.set\t" __SYMBOL_NAME(alias) "," __SYMBOL_NAME(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; \ 84 ALIGN; \ 85 name: 86 #endif 87 #endif /* LINKER_SCRIPT */ 88 89 #ifndef WEAK 90 #define WEAK(name) \ 91 .weak name; \ 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; \ 107 END(name) 108 #endif 109 110 #endif 111 112 #endif 113