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/* SPDX-License-Identifier: GPL-2.0 / #ifndef _LINUX_LINKAGE_H #define _LINUX_LINKAGE_H #include <linux/compiler_types.h> #include <linux/stringify.h> #include <linux/export.h> #include <asm/linkage.h> / Some toolchains use other characters (e.g. '`') to mark new line in macro / #ifndef ASM_NL #define ASM_NL ; #endif #ifdef __cplusplus #define CPP_ASMLINKAGE extern "C" #else #define CPP_ASMLINKAGE #endif #ifndef asmlinkage #define asmlinkage CPP_ASMLINKAGE #endif #ifndef cond_syscall #define cond_syscall(x) asm( \ ".weak " __stringify(x) "\n\t" \ ".set " __stringify(x) "," \ __stringify(sys_ni_syscall)) #endif #ifndef SYSCALL_ALIAS #define SYSCALL_ALIAS(alias, name) asm( \ ".globl " __stringify(alias) "\n\t" \ ".set " __stringify(alias) "," \ __stringify(name)) #endif #define __page_aligned_data __section(.data..page_aligned) __aligned(PAGE_SIZE) #define __page_aligned_bss __section(.bss..page_aligned) __aligned(PAGE_SIZE) / * For assembly routines. * * Note when using these that you must specify the appropriate * alignment directives yourself / #define __PAGE_ALIGNED_DATA .section ".data..page_aligned", "aw" #define __PAGE_ALIGNED_BSS .section ".bss..page_aligned", "aw" / * This is used by architectures to keep arguments on the stack * untouched by the compiler by keeping them live until the end. * The argument stack may be owned by the assembly-language * caller, not the callee, and gcc doesn't always understand * that. * * We have the return value, and a maximum of six arguments. * * This should always be followed by a "return ret" for the * protection to work (ie no more work that the compiler might * end up needing stack temporaries for). / / Assembly files may be compiled with -traditional .. / #ifndef __ASSEMBLY__ #ifndef asmlinkage_protect # define asmlinkage_protect(n, ret, args...) do { } while (0) #endif #endif #ifndef __ALIGN #define __ALIGN .align 4,0x90 #define __ALIGN_STR ".align 4,0x90" #endif #ifdef __ASSEMBLY__ / SYM_T_FUNC -- type used by assembler to mark functions / #ifndef SYM_T_FUNC #define SYM_T_FUNC STT_FUNC #endif / SYM_T_OBJECT -- type used by assembler to mark data / #ifndef SYM_T_OBJECT #define SYM_T_OBJECT STT_OBJECT #endif / SYM_T_NONE -- type used by assembler to mark entries of unknown type / #ifndef SYM_T_NONE #define SYM_T_NONE STT_NOTYPE #endif / SYM_A_* -- align the symbol? / #define SYM_A_ALIGN ALIGN #define SYM_A_NONE / nothing / / SYM_L_* -- linkage of symbols / #define SYM_L_GLOBAL(name) .globl name #define SYM_L_WEAK(name) .weak name #define SYM_L_LOCAL(name) / nothing / #ifndef LINKER_SCRIPT #define ALIGN __ALIGN #define ALIGN_STR __ALIGN_STR / === DEPRECATED annotations === / #ifndef GLOBAL / deprecated, use SYM_DATA, SYM_ENTRY, or similar / #define GLOBAL(name) \ .globl name ASM_NL \ name: #endif #ifndef ENTRY /* deprecated, use SYM_FUNC_START / #define ENTRY(name) \ SYM_FUNC_START(name) #endif #endif / LINKER_SCRIPT / #ifndef WEAK / deprecated, use SYM_FUNC_START_WEAK* / #define WEAK(name) \ SYM_FUNC_START_WEAK(name) #endif #ifndef END / deprecated, use SYM_FUNC_END, SYM_DATA_END, or SYM_END / #define END(name) \ .size name, .-name #endif / If symbol 'name' is treated as a subroutine (gets called, and returns) * then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of * static analysis tools such as stack depth analyzer. / #ifndef ENDPROC / deprecated, use SYM_FUNC_END / #define ENDPROC(name) \ SYM_FUNC_END(name) #endif / === generic annotations === / / SYM_ENTRY -- use only if you have to for non-paired symbols / #ifndef SYM_ENTRY #define SYM_ENTRY(name, linkage, align...) \ linkage(name) ASM_NL \ align ASM_NL \ name: #endif / SYM_START -- use only if you have to / #ifndef SYM_START #define SYM_START(name, linkage, align...) \ SYM_ENTRY(name, linkage, align) #endif / SYM_END -- use only if you have to / #ifndef SYM_END #define SYM_END(name, sym_type) \ .type name sym_type ASM_NL \ .size name, .-name #endif / === code annotations === / / * FUNC -- C-like functions (proper stack frame etc.) * CODE -- non-C code (e.g. irq handlers with different, special stack etc.) * * Objtool validates stack for FUNC, but not for CODE. * Objtool generates debug info for both FUNC & CODE, but needs special * annotations for each CODE's start (to describe the actual stack frame). * * ALIAS -- does not generate debug info -- the aliased function will / / SYM_INNER_LABEL_ALIGN -- only for labels in the middle of code / #ifndef SYM_INNER_LABEL_ALIGN #define SYM_INNER_LABEL_ALIGN(name, linkage) \ .type name SYM_T_NONE ASM_NL \ SYM_ENTRY(name, linkage, SYM_A_ALIGN) #endif / SYM_INNER_LABEL -- only for labels in the middle of code / #ifndef SYM_INNER_LABEL #define SYM_INNER_LABEL(name, linkage) \ .type name SYM_T_NONE ASM_NL \ SYM_ENTRY(name, linkage, SYM_A_NONE) #endif / * SYM_FUNC_START_LOCAL_ALIAS -- use where there are two local names for one * function / #ifndef SYM_FUNC_START_LOCAL_ALIAS #define SYM_FUNC_START_LOCAL_ALIAS(name) \ SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN) #endif / * SYM_FUNC_START_ALIAS -- use where there are two global names for one * function / #ifndef SYM_FUNC_START_ALIAS #define SYM_FUNC_START_ALIAS(name) \ SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) #endif / SYM_FUNC_START -- use for global functions / #ifndef SYM_FUNC_START / * The same as SYM_FUNC_START_ALIAS, but we will need to distinguish these two * later. / #define SYM_FUNC_START(name) \ SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) #endif / SYM_FUNC_START_NOALIGN -- use for global functions, w/o alignment / #ifndef SYM_FUNC_START_NOALIGN #define SYM_FUNC_START_NOALIGN(name) \ SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE) #endif / SYM_FUNC_START_LOCAL -- use for local functions / #ifndef SYM_FUNC_START_LOCAL / the same as SYM_FUNC_START_LOCAL_ALIAS, see comment near SYM_FUNC_START / #define SYM_FUNC_START_LOCAL(name) \ SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN) #endif / SYM_FUNC_START_LOCAL_NOALIGN -- use for local functions, w/o alignment / #ifndef SYM_FUNC_START_LOCAL_NOALIGN #define SYM_FUNC_START_LOCAL_NOALIGN(name) \ SYM_START(name, SYM_L_LOCAL, SYM_A_NONE) #endif / SYM_FUNC_START_WEAK -- use for weak functions / #ifndef SYM_FUNC_START_WEAK #define SYM_FUNC_START_WEAK(name) \ SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN) #endif / SYM_FUNC_START_WEAK_NOALIGN -- use for weak functions, w/o alignment / #ifndef SYM_FUNC_START_WEAK_NOALIGN #define SYM_FUNC_START_WEAK_NOALIGN(name) \ SYM_START(name, SYM_L_WEAK, SYM_A_NONE) #endif / SYM_FUNC_END_ALIAS -- the end of LOCAL_ALIASed or ALIASed function / #ifndef SYM_FUNC_END_ALIAS #define SYM_FUNC_END_ALIAS(name) \ SYM_END(name, SYM_T_FUNC) #endif / * SYM_FUNC_END -- the end of SYM_FUNC_START_LOCAL, SYM_FUNC_START, * SYM_FUNC_START_WEAK, ... / #ifndef SYM_FUNC_END / the same as SYM_FUNC_END_ALIAS, see comment near SYM_FUNC_START / #define SYM_FUNC_END(name) \ SYM_END(name, SYM_T_FUNC) #endif / SYM_CODE_START -- use for non-C (special) functions / #ifndef SYM_CODE_START #define SYM_CODE_START(name) \ SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) #endif / SYM_CODE_START_NOALIGN -- use for non-C (special) functions, w/o alignment / #ifndef SYM_CODE_START_NOALIGN #define SYM_CODE_START_NOALIGN(name) \ SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE) #endif / SYM_CODE_START_LOCAL -- use for local non-C (special) functions / #ifndef SYM_CODE_START_LOCAL #define SYM_CODE_START_LOCAL(name) \ SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN) #endif / * SYM_CODE_START_LOCAL_NOALIGN -- use for local non-C (special) functions, * w/o alignment / #ifndef SYM_CODE_START_LOCAL_NOALIGN #define SYM_CODE_START_LOCAL_NOALIGN(name) \ SYM_START(name, SYM_L_LOCAL, SYM_A_NONE) #endif / SYM_CODE_END -- the end of SYM_CODE_START_LOCAL, SYM_CODE_START, ... / #ifndef SYM_CODE_END #define SYM_CODE_END(name) \ SYM_END(name, SYM_T_NONE) #endif / === data annotations === / / SYM_DATA_START -- global data symbol / #ifndef SYM_DATA_START #define SYM_DATA_START(name) \ SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE) #endif / SYM_DATA_START -- local data symbol / #ifndef SYM_DATA_START_LOCAL #define SYM_DATA_START_LOCAL(name) \ SYM_START(name, SYM_L_LOCAL, SYM_A_NONE) #endif / SYM_DATA_END -- the end of SYM_DATA_START symbol / #ifndef SYM_DATA_END #define SYM_DATA_END(name) \ SYM_END(name, SYM_T_OBJECT) #endif / SYM_DATA_END_LABEL -- the labeled end of SYM_DATA_START symbol / #ifndef SYM_DATA_END_LABEL #define SYM_DATA_END_LABEL(name, linkage, label) \ linkage(label) ASM_NL \ .type label SYM_T_OBJECT ASM_NL \ label: \ SYM_END(name, SYM_T_OBJECT) #endif / SYM_DATA -- start+end wrapper around simple global data / #ifndef SYM_DATA #define SYM_DATA(name, data...) \ SYM_DATA_START(name) ASM_NL \ data ASM_NL \ SYM_DATA_END(name) #endif / SYM_DATA_LOCAL -- start+end wrapper around simple local data / #ifndef SYM_DATA_LOCAL #define SYM_DATA_LOCAL(name, data...) \ SYM_DATA_START_LOCAL(name) ASM_NL \ data ASM_NL \ SYM_DATA_END(name) #endif #endif / __ASSEMBLY__ / #endif / _LINUX_LINKAGE_H */

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