1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_SCS_H 3 #define _ASM_SCS_H 4 5 #ifdef __ASSEMBLER__ 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_base 14 get_current_task scs_sp 15 ldr scs_sp, [scs_sp, #TSK_TI_SCS_BASE] 16 .endm 17 18 .macro scs_load_current 19 get_current_task scs_sp 20 ldr scs_sp, [scs_sp, #TSK_TI_SCS_SP] 21 .endm 22 23 .macro scs_save tsk 24 str scs_sp, [\tsk, #TSK_TI_SCS_SP] 25 .endm 26 #else 27 .macro scs_load_current_base 28 .endm 29 30 .macro scs_load_current 31 .endm 32 33 .macro scs_save tsk 34 .endm 35 #endif /* CONFIG_SHADOW_CALL_STACK */ 36 37 38 #else 39 40 #include <linux/scs.h> 41 #include <asm/cpufeature.h> 42 43 #ifdef CONFIG_UNWIND_PATCH_PAC_INTO_SCS 44 static inline void dynamic_scs_init(void) 45 { 46 extern bool __pi_dynamic_scs_is_enabled; 47 48 if (__pi_dynamic_scs_is_enabled) { 49 pr_info("Enabling dynamic shadow call stack\n"); 50 static_branch_enable(&dynamic_scs_enabled); 51 } 52 } 53 #else 54 static inline void dynamic_scs_init(void) {} 55 #endif 56 57 enum { 58 EDYNSCS_INVALID_CIE_HEADER = 1, 59 EDYNSCS_INVALID_CIE_SDATA_SIZE = 2, 60 EDYNSCS_INVALID_FDE_AUGM_DATA_SIZE = 3, 61 EDYNSCS_INVALID_CFA_OPCODE = 4, 62 }; 63 64 int __pi_scs_patch(const u8 eh_frame[], int size, bool skip_dry_run); 65 66 #endif /* __ASSEMBLER__ */ 67 68 #endif /* _ASM_SCS_H */ 69