| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ASM_SCS_H |
| #define _ASM_SCS_H |
| |
| #ifdef __ASSEMBLY__ |
| |
| #include <asm/asm-offsets.h> |
| #include <asm/sysreg.h> |
| |
| #ifdef CONFIG_SHADOW_CALL_STACK |
| scs_sp .req x18 |
| |
| .macro scs_load_current |
| get_current_task scs_sp |
| ldr scs_sp, [scs_sp, #TSK_TI_SCS_SP] |
| .endm |
| |
| .macro scs_save tsk |
| str scs_sp, [\tsk, #TSK_TI_SCS_SP] |
| .endm |
| #else |
| .macro scs_load_current |
| .endm |
| |
| .macro scs_save tsk |
| .endm |
| #endif /* CONFIG_SHADOW_CALL_STACK */ |
| |
| |
| #else |
| |
| #include <linux/scs.h> |
| #include <asm/cpufeature.h> |
| |
| #ifdef CONFIG_UNWIND_PATCH_PAC_INTO_SCS |
| static inline void dynamic_scs_init(void) |
| { |
| extern bool __pi_dynamic_scs_is_enabled; |
| |
| if (__pi_dynamic_scs_is_enabled) { |
| pr_info("Enabling dynamic shadow call stack\n"); |
| static_branch_enable(&dynamic_scs_enabled); |
| } |
| } |
| #else |
| static inline void dynamic_scs_init(void) {} |
| #endif |
| |
| int __pi_scs_patch(const u8 eh_frame[], int size); |
| asmlinkage void __pi_scs_patch_vmlinux(void); |
| |
| #endif /* __ASSEMBLY __ */ |
| |
| #endif /* _ASM_SCS_H */ |
