354 lines
9.3 KiB
C
354 lines
9.3 KiB
C
/* 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 CONFIG_ARCH_USE_SYM_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 /* CONFIG_ARCH_USE_SYM_ANNOTATIONS */
|
|
#endif /* LINKER_SCRIPT */
|
|
|
|
#ifndef CONFIG_ARCH_USE_SYM_ANNOTATIONS
|
|
#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
|
|
#endif /* CONFIG_ARCH_USE_SYM_ANNOTATIONS */
|
|
|
|
/* === 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 */
|