1 #ifndef __ASM_LINKAGE_H 2 #define __ASM_LINKAGE_H 3 4 #define __ALIGN .align 2 5 #define __ALIGN_STR ".align 2" 6 7 #if defined(CONFIG_ARM64_BTI_KERNEL) && defined(__aarch64__) 8 9 /* 10 * Since current versions of gas reject the BTI instruction unless we 11 * set the architecture version to v8.5 we use the hint instruction 12 * instead. 13 */ 14 #define BTI_C hint 34 ; 15 16 /* 17 * When using in-kernel BTI we need to ensure that PCS-conformant assembly 18 * functions have suitable annotations. Override SYM_FUNC_START to insert 19 * a BTI landing pad at the start of everything. 20 */ 21 #define SYM_FUNC_START(name) \ 22 SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) \ 23 BTI_C 24 25 #define SYM_FUNC_START_NOALIGN(name) \ 26 SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE) \ 27 BTI_C 28 29 #define SYM_FUNC_START_LOCAL(name) \ 30 SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN) \ 31 BTI_C 32 33 #define SYM_FUNC_START_LOCAL_NOALIGN(name) \ 34 SYM_START(name, SYM_L_LOCAL, SYM_A_NONE) \ 35 BTI_C 36 37 #define SYM_FUNC_START_WEAK(name) \ 38 SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN) \ 39 BTI_C 40 41 #define SYM_FUNC_START_WEAK_NOALIGN(name) \ 42 SYM_START(name, SYM_L_WEAK, SYM_A_NONE) \ 43 BTI_C 44 45 #endif 46 47 /* 48 * Annotate a function as position independent, i.e., safe to be called before 49 * the kernel virtual mapping is activated. 50 */ 51 #define SYM_FUNC_START_PI(x) \ 52 SYM_FUNC_START_ALIAS(__pi_##x); \ 53 SYM_FUNC_START(x) 54 55 #define SYM_FUNC_START_WEAK_PI(x) \ 56 SYM_FUNC_START_ALIAS(__pi_##x); \ 57 SYM_FUNC_START_WEAK(x) 58 59 #define SYM_FUNC_START_WEAK_ALIAS_PI(x) \ 60 SYM_FUNC_START_ALIAS(__pi_##x); \ 61 SYM_START(x, SYM_L_WEAK, SYM_A_ALIGN) 62 63 #define SYM_FUNC_END_PI(x) \ 64 SYM_FUNC_END(x); \ 65 SYM_FUNC_END_ALIAS(__pi_##x) 66 67 #define SYM_FUNC_END_ALIAS_PI(x) \ 68 SYM_FUNC_END_ALIAS(x); \ 69 SYM_FUNC_END_ALIAS(__pi_##x) 70 71 #endif 72