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