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