.. | .. |
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4 | 4 | #define __ALIGN .align 2 |
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5 | 5 | #define __ALIGN_STR ".align 2" |
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6 | 6 | |
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| 7 | +#if defined(CONFIG_ARM64_BTI_KERNEL) && defined(__aarch64__) |
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| 8 | + |
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| 9 | +/* |
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| 10 | + * Since current versions of gas reject the BTI instruction unless we |
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| 11 | + * set the architecture version to v8.5 we use the hint instruction |
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| 12 | + * instead. |
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| 13 | + */ |
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| 14 | +#define BTI_C hint 34 ; |
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| 15 | + |
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| 16 | +/* |
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| 17 | + * When using in-kernel BTI we need to ensure that PCS-conformant assembly |
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| 18 | + * functions have suitable annotations. Override SYM_FUNC_START to insert |
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| 19 | + * a BTI landing pad at the start of everything. |
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| 20 | + */ |
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| 21 | +#define SYM_FUNC_START(name) \ |
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| 22 | + SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) \ |
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| 23 | + BTI_C |
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| 24 | + |
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| 25 | +#define SYM_FUNC_START_NOALIGN(name) \ |
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| 26 | + SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE) \ |
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| 27 | + BTI_C |
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| 28 | + |
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| 29 | +#define SYM_FUNC_START_LOCAL(name) \ |
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| 30 | + SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN) \ |
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| 31 | + BTI_C |
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| 32 | + |
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| 33 | +#define SYM_FUNC_START_LOCAL_NOALIGN(name) \ |
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| 34 | + SYM_START(name, SYM_L_LOCAL, SYM_A_NONE) \ |
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| 35 | + BTI_C |
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| 36 | + |
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| 37 | +#define SYM_FUNC_START_WEAK(name) \ |
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| 38 | + SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN) \ |
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| 39 | + BTI_C |
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| 40 | + |
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| 41 | +#define SYM_FUNC_START_WEAK_NOALIGN(name) \ |
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| 42 | + SYM_START(name, SYM_L_WEAK, SYM_A_NONE) \ |
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| 43 | + BTI_C |
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| 44 | + |
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| 45 | +#endif |
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| 46 | + |
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| 47 | +/* |
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| 48 | + * Annotate a function as position independent, i.e., safe to be called before |
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| 49 | + * the kernel virtual mapping is activated. |
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| 50 | + */ |
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| 51 | +#define SYM_FUNC_START_PI(x) \ |
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| 52 | + SYM_FUNC_START_ALIAS(__pi_##x); \ |
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| 53 | + SYM_FUNC_START(x) |
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| 54 | + |
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| 55 | +#define SYM_FUNC_START_WEAK_PI(x) \ |
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| 56 | + SYM_FUNC_START_ALIAS(__pi_##x); \ |
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| 57 | + SYM_FUNC_START_WEAK(x) |
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| 58 | + |
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| 59 | +#define SYM_FUNC_END_PI(x) \ |
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| 60 | + SYM_FUNC_END(x); \ |
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| 61 | + SYM_FUNC_END_ALIAS(__pi_##x) |
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| 62 | + |
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7 | 63 | #endif |
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