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 #ifndef asmregparm 18 # define asmregparm 19 #endif 20 21 #define __page_aligned_data __section(.data..page_aligned) __aligned(PAGE_SIZE) 22 #define __page_aligned_bss __section(.bss..page_aligned) __aligned(PAGE_SIZE) 23 24 /* 25 * For assembly routines. 26 * 27 * Note when using these that you must specify the appropriate 28 * alignment directives yourself 29 */ 30 #define __PAGE_ALIGNED_DATA .section ".data..page_aligned", "aw" 31 #define __PAGE_ALIGNED_BSS .section ".bss..page_aligned", "aw" 32 33 /* 34 * This is used by architectures to keep arguments on the stack 35 * untouched by the compiler by keeping them live until the end. 36 * The argument stack may be owned by the assembly-language 37 * caller, not the callee, and gcc doesn't always understand 38 * that. 39 * 40 * We have the return value, and a maximum of six arguments. 41 * 42 * This should always be followed by a "return ret" for the 43 * protection to work (ie no more work that the compiler might 44 * end up needing stack temporaries for). 45 */ 46 /* Assembly files may be compiled with -traditional .. */ 47 #ifndef __ASSEMBLY__ 48 #ifndef asmlinkage_protect 49 # define asmlinkage_protect(n, ret, args...) do { } while (0) 50 #endif 51 #endif 52 53 #ifndef __ALIGN 54 #define __ALIGN .align 4,0x90 55 #define __ALIGN_STR ".align 4,0x90" 56 #endif 57 58 #ifdef __ASSEMBLY__ 59 60 #ifndef LINKER_SCRIPT 61 #define ALIGN __ALIGN 62 #define ALIGN_STR __ALIGN_STR 63 64 #ifndef ENTRY 65 #define ENTRY(name) \ 66 .globl name; \ 67 ALIGN; \ 68 name: 69 #endif 70 #endif /* LINKER_SCRIPT */ 71 72 #ifndef WEAK 73 #define WEAK(name) \ 74 .weak name; \ 75 name: 76 #endif 77 78 #ifndef END 79 #define END(name) \ 80 .size name, .-name 81 #endif 82 83 /* If symbol 'name' is treated as a subroutine (gets called, and returns) 84 * then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of 85 * static analysis tools such as stack depth analyzer. 86 */ 87 #ifndef ENDPROC 88 #define ENDPROC(name) \ 89 .type name, @function; \ 90 END(name) 91 #endif 92 93 #endif 94 95 #define NORET_TYPE /**/ 96 #define ATTRIB_NORET __attribute__((noreturn)) 97 #define NORET_AND noreturn, 98 99 #endif 100