b6c4ea4841
Add yet another set of assembly symbol annotations, this time for the borderline-absurd situation of a function aliasing to a weak symbol which itself also wants a position-independent alias. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/75545b3c4129b20b887474bb58a9cf302bf2132b.1622128527.git.robin.murphy@arm.com Signed-off-by: Will Deacon <will@kernel.org>
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
#ifndef __ASM_LINKAGE_H
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#define __ASM_LINKAGE_H
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#define __ALIGN .align 2
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#define __ALIGN_STR ".align 2"
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#if defined(CONFIG_ARM64_BTI_KERNEL) && defined(__aarch64__)
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/*
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* Since current versions of gas reject the BTI instruction unless we
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* set the architecture version to v8.5 we use the hint instruction
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* instead.
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*/
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#define BTI_C hint 34 ;
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/*
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* When using in-kernel BTI we need to ensure that PCS-conformant assembly
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* functions have suitable annotations. Override SYM_FUNC_START to insert
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* a BTI landing pad at the start of everything.
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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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#endif
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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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