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Diffstat (limited to 'arch/arm64/include/asm/scs.h')
-rw-r--r-- | arch/arm64/include/asm/scs.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/scs.h b/arch/arm64/include/asm/scs.h new file mode 100644 index 000000000000..2e010ea76be2 --- /dev/null +++ b/arch/arm64/include/asm/scs.h @@ -0,0 +1,54 @@ +/* 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 */ |