diff options
Diffstat (limited to 'arch/arm64/include/asm/scs.h')
| -rw-r--r-- | arch/arm64/include/asm/scs.h | 46 |
1 files changed, 46 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..96549353b0cb --- /dev/null +++ b/arch/arm64/include/asm/scs.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_SCS_H +#define _ASM_SCS_H + +#ifdef __ASSEMBLY__ + +#ifdef CONFIG_SHADOW_CALL_STACK + .macro scs_load tsk, tmp + ldp x18, \tmp, [\tsk, #TSK_TI_SCS_BASE] + add x18, x18, \tmp + .endm + + .macro scs_save tsk, tmp + ldr \tmp, [\tsk, #TSK_TI_SCS_BASE] + sub \tmp, x18, \tmp + str \tmp, [\tsk, #TSK_TI_SCS_OFFSET] + .endm +#else + .macro scs_load tsk, tmp + .endm + + .macro scs_save tsk, tmp + .endm +#endif /* CONFIG_SHADOW_CALL_STACK */ + +#else /* __ASSEMBLY__ */ + +#include <linux/scs.h> + +#ifdef CONFIG_SHADOW_CALL_STACK + +static inline void scs_overflow_check(struct task_struct *tsk) +{ + if (unlikely(scs_corrupted(tsk))) + panic("corrupted shadow stack detected inside scheduler\n"); +} + +#else /* CONFIG_SHADOW_CALL_STACK */ + +static inline void scs_overflow_check(struct task_struct *tsk) {} + +#endif /* CONFIG_SHADOW_CALL_STACK */ + +#endif /* __ASSEMBLY __ */ + +#endif /* _ASM_SCS_H */ |