dd73d18e7f
Not all .S files include asm/assembler.h, however the SYM_FUNC_*
definitions invoke the 'bti' macro. Include asm/assembler.h in
asm/linkage.h.
Fixes: 9be34be87c ("arm64: Add macro version of the BTI instruction")
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
#ifndef __ASM_LINKAGE_H
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#define __ASM_LINKAGE_H
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#ifdef __ASSEMBLY__
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#include <asm/assembler.h>
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#endif
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#define __ALIGN .align 2
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#define __ALIGN_STR ".align 2"
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/*
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* When using in-kernel BTI we need to ensure that PCS-conformant
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* assembly functions have suitable annotations. Override
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* SYM_FUNC_START to insert a BTI landing pad at the start of
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* everything, the override is done unconditionally so we're more
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* likely to notice any drift from the overridden definitions.
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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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bti c ;
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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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bti c ;
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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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bti c ;
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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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bti c ;
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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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bti c ;
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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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bti c ;
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/*
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* Annotate a function as position independent, i.e., safe to be called before
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* the kernel virtual mapping is activated.
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*/
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#define SYM_FUNC_START_PI(x) \
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SYM_FUNC_START_ALIAS(__pi_##x); \
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SYM_FUNC_START(x)
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#define SYM_FUNC_START_WEAK_PI(x) \
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SYM_FUNC_START_ALIAS(__pi_##x); \
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SYM_FUNC_START_WEAK(x)
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#define SYM_FUNC_START_WEAK_ALIAS_PI(x) \
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SYM_FUNC_START_ALIAS(__pi_##x); \
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SYM_START(x, SYM_L_WEAK, SYM_A_ALIGN)
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#define SYM_FUNC_END_PI(x) \
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SYM_FUNC_END(x); \
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SYM_FUNC_END_ALIAS(__pi_##x)
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#define SYM_FUNC_END_ALIAS_PI(x) \
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SYM_FUNC_END_ALIAS(x); \
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SYM_FUNC_END_ALIAS(__pi_##x)
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#endif
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