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