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 #define BTI_J hint 36 ; 16 17 /* 18 * When using in-kernel BTI we need to ensure that PCS-conformant assembly 19 * functions have suitable annotations. Override SYM_FUNC_START to insert 20 * a BTI landing pad at the start of everything. 21 */ 22 #define SYM_FUNC_START(name) \ 23 SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) \ 24 BTI_C 25 26 #define SYM_FUNC_START_NOALIGN(name) \ 27 SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE) \ 28 BTI_C 29 30 #define SYM_FUNC_START_LOCAL(name) \ 31 SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN) \ 32 BTI_C 33 34 #define SYM_FUNC_START_LOCAL_NOALIGN(name) \ 35 SYM_START(name, SYM_L_LOCAL, SYM_A_NONE) \ 36 BTI_C 37 38 #define SYM_FUNC_START_WEAK(name) \ 39 SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN) \ 40 BTI_C 41 42 #define SYM_FUNC_START_WEAK_NOALIGN(name) \ 43 SYM_START(name, SYM_L_WEAK, SYM_A_NONE) \ 44 BTI_C 45 46 #define SYM_INNER_LABEL(name, linkage) \ 47 .type name SYM_T_NONE ASM_NL \ 48 SYM_ENTRY(name, linkage, SYM_A_NONE) \ 49 BTI_J 50 51 #endif 52 53 /* 54 * Annotate a function as position independent, i.e., safe to be called before 55 * the kernel virtual mapping is activated. 56 */ 57 #define SYM_FUNC_START_PI(x) \ 58 SYM_FUNC_START_ALIAS(__pi_##x); \ 59 SYM_FUNC_START(x) 60 61 #define SYM_FUNC_START_WEAK_PI(x) \ 62 SYM_FUNC_START_ALIAS(__pi_##x); \ 63 SYM_FUNC_START_WEAK(x) 64 65 #define SYM_FUNC_END_PI(x) \ 66 SYM_FUNC_END(x); \ 67 SYM_FUNC_END_ALIAS(__pi_##x) 68 69 #endif 70