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ad697a1aec
Declaring a global symbol in assembly is tedious, error-prone, and
painful to read. While ENTRY() exists, this is supposed to be used for
function entry points, and this affects alignment in a potentially
undesireable manner.
Instead, let's add a generic GLOBAL() macro for this, as x86 added
locally in commit:
95695547a7 ("x86: asm linkage - introduce GLOBAL macro")
... thus allowing us to use this more freely in the kernel.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Torsten Duwe <duwe@suse.de>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
/* 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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#ifndef LINKER_SCRIPT
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#define ALIGN __ALIGN
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#define ALIGN_STR __ALIGN_STR
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#ifndef GLOBAL
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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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#define ENTRY(name) \
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.globl name ASM_NL \
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ALIGN ASM_NL \
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name:
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#endif
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#endif /* LINKER_SCRIPT */
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#ifndef WEAK
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#define WEAK(name) \
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.weak name ASM_NL \
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ALIGN ASM_NL \
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name:
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#endif
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#ifndef 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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#define ENDPROC(name) \
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.type name, @function ASM_NL \
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END(name)
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#endif
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#endif
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#endif
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