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