| | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| | 2 | #ifndef _LINUX_LINKAGE_H |
| | 3 | #define _LINUX_LINKAGE_H |
| | 4 | |
| | 5 | #include <linux/compiler_types.h> |
| | 6 | #include <linux/stringify.h> |
| | 7 | #include <linux/export.h> |
| | 8 | #include <asm/linkage.h> |
| | 9 | |
| | 10 | /* Some toolchains use other characters (e.g. '`') to mark new line in macro */ |
| | 11 | #ifndef ASM_NL |
| | 12 | #define ASM_NL ; |
| | 13 | #endif |
| | 14 | |
| | 15 | #ifdef __cplusplus |
| | 16 | #define CPP_ASMLINKAGE extern "C" |
| | 17 | #else |
| | 18 | #define CPP_ASMLINKAGE |
| | 19 | #endif |
| | 20 | |
| | 21 | #ifndef asmlinkage |
| | 22 | #define asmlinkage CPP_ASMLINKAGE |
| | 23 | #endif |
| | 24 | |
| | 25 | #ifndef cond_syscall |
| | 26 | #define cond_syscall(x) asm( \ |
| | 27 | ".weak " VMLINUX_SYMBOL_STR(x) "\n\t" \ |
| | 28 | ".set " VMLINUX_SYMBOL_STR(x) "," \ |
| | 29 | VMLINUX_SYMBOL_STR(sys_ni_syscall)) |
| | 30 | #endif |
| | 31 | |
| | 32 | #ifndef SYSCALL_ALIAS |
| | 33 | #define SYSCALL_ALIAS(alias, name) asm( \ |
| | 34 | ".globl " VMLINUX_SYMBOL_STR(alias) "\n\t" \ |
| | 35 | ".set " VMLINUX_SYMBOL_STR(alias) "," \ |
| | 36 | VMLINUX_SYMBOL_STR(name)) |
| | 37 | #endif |
| | 38 | |
| | 39 | #define __page_aligned_data __section(.data..page_aligned) __aligned(PAGE_SIZE) |
| | 40 | #define __page_aligned_bss __section(.bss..page_aligned) __aligned(PAGE_SIZE) |
| | 41 | |
| | 42 | /* |
| | 43 | * For assembly routines. |
| | 44 | * |
| | 45 | * Note when using these that you must specify the appropriate |
| | 46 | * alignment directives yourself |
| | 47 | */ |
| | 48 | #define __PAGE_ALIGNED_DATA .section ".data..page_aligned", "aw" |
| | 49 | #define __PAGE_ALIGNED_BSS .section ".bss..page_aligned", "aw" |
| | 50 | |
| | 51 | /* |
| | 52 | * This is used by architectures to keep arguments on the stack |
| | 53 | * untouched by the compiler by keeping them live until the end. |
| | 54 | * The argument stack may be owned by the assembly-language |
| | 55 | * caller, not the callee, and gcc doesn't always understand |
| | 56 | * that. |
| | 57 | * |
| | 58 | * We have the return value, and a maximum of six arguments. |
| | 59 | * |
| | 60 | * This should always be followed by a "return ret" for the |
| | 61 | * protection to work (ie no more work that the compiler might |
| | 62 | * end up needing stack temporaries for). |
| | 63 | */ |
| | 64 | /* Assembly files may be compiled with -traditional .. */ |
| | 65 | #ifndef __ASSEMBLY__ |
| | 66 | #ifndef asmlinkage_protect |
| | 67 | # define asmlinkage_protect(n, ret, args...) do { } while (0) |
| | 68 | #endif |
| | 69 | #endif |
| | 70 | |
| | 71 | #ifndef __ALIGN |
| | 72 | #define __ALIGN .align 4,0x90 |
| | 73 | #define __ALIGN_STR ".align 4,0x90" |
| | 74 | #endif |
| | 75 | |
| | 76 | #ifdef __ASSEMBLY__ |
| | 77 | |
| | 78 | #ifndef LINKER_SCRIPT |
| | 79 | #define ALIGN __ALIGN |
| | 80 | #define ALIGN_STR __ALIGN_STR |
| | 81 | |
| | 82 | #ifndef ENTRY |
| | 83 | #define ENTRY(name) \ |
| | 84 | .globl name ASM_NL \ |
| | 85 | ALIGN ASM_NL \ |
| | 86 | name: |
| | 87 | #endif |
| | 88 | #endif /* LINKER_SCRIPT */ |
| | 89 | |
| | 90 | #ifndef WEAK |
| | 91 | #define WEAK(name) \ |
| | 92 | .weak name ASM_NL \ |
| | 93 | name: |
| | 94 | #endif |
| | 95 | |
| | 96 | #ifndef END |
| | 97 | #define END(name) \ |
| | 98 | .size name, .-name |
| | 99 | #endif |
| | 100 | |
| | 101 | /* If symbol 'name' is treated as a subroutine (gets called, and returns) |
| | 102 | * then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of |
| | 103 | * static analysis tools such as stack depth analyzer. |
| | 104 | */ |
| | 105 | #ifndef ENDPROC |
| | 106 | #define ENDPROC(name) \ |
| | 107 | .type name, @function ASM_NL \ |
| | 108 | END(name) |
| | 109 | #endif |
| | 110 | |
| | 111 | #endif |
| | 112 | |
| | 113 | #endif |
projects / mirror_ubuntu-bionic-kernel.git / blame_incremental