1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_SCS_H 3 #define _ASM_SCS_H 4 5 #ifdef __ASSEMBLY__ 6 7 #include <asm/asm-offsets.h> 8 #include <asm/sysreg.h> 9 10 #ifdef CONFIG_SHADOW_CALL_STACK 11 scs_sp .req x18 12 13 .macro scs_load_current 14 get_current_task scs_sp 15 ldr scs_sp, [scs_sp, #TSK_TI_SCS_SP] 16 .endm 17 18 .macro scs_save tsk 19 str scs_sp, [\tsk, #TSK_TI_SCS_SP] 20 .endm 21 #else 22 .macro scs_load_current 23 .endm 24 25 .macro scs_save tsk 26 .endm 27 #endif /* CONFIG_SHADOW_CALL_STACK */ 28 29 30 #else 31 32 #include <linux/scs.h> 33 #include <asm/cpufeature.h> 34 35 #ifdef CONFIG_UNWIND_PATCH_PAC_INTO_SCS 36 static inline void dynamic_scs_init(void) 37 { 38 extern bool __pi_dynamic_scs_is_enabled; 39 40 if (__pi_dynamic_scs_is_enabled) { 41 pr_info("Enabling dynamic shadow call stack\n"); 42 static_branch_enable(&dynamic_scs_enabled); 43 } 44 } 45 #else 46 static inline void dynamic_scs_init(void) {} 47 #endif 48 49 int __pi_scs_patch(const u8 eh_frame[], int size); 50 asmlinkage void __pi_scs_patch_vmlinux(void); 51 52 #endif /* __ASSEMBLY __ */ 53 54 #endif /* _ASM_SCS_H */ 55