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63 lines
1.5 KiB
63 lines
1.5 KiB
#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_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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#endif
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