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