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 36static 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 46static inline void dynamic_scs_init(void) {} 47#endif 48 49int __pi_scs_patch(const u8 eh_frame[], int size); 50asmlinkage void __pi_scs_patch_vmlinux(void); 51 52#endif /* __ASSEMBLY __ */ 53 54#endif /* _ASM_SCS_H */ 55