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