Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_ASM_POINTER_AUTH_H
3#define __ASM_ASM_POINTER_AUTH_H
4
5#include <asm/alternative.h>
6#include <asm/asm-offsets.h>
7#include <asm/cpufeature.h>
8#include <asm/sysreg.h>
9
10#ifdef CONFIG_ARM64_PTR_AUTH_KERNEL
11
12 .macro __ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3
13 mov \tmp1, #THREAD_KEYS_KERNEL
14 add \tmp1, \tsk, \tmp1
15 ldp \tmp2, \tmp3, [\tmp1, #PTRAUTH_KERNEL_KEY_APIA]
16 msr_s SYS_APIAKEYLO_EL1, \tmp2
17 msr_s SYS_APIAKEYHI_EL1, \tmp3
18 .endm
19
20 .macro ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3
21alternative_if ARM64_HAS_ADDRESS_AUTH
22 __ptrauth_keys_install_kernel_nosync \tsk, \tmp1, \tmp2, \tmp3
23alternative_else_nop_endif
24 .endm
25
26 .macro ptrauth_keys_install_kernel tsk, tmp1, tmp2, tmp3
27alternative_if ARM64_HAS_ADDRESS_AUTH
28 __ptrauth_keys_install_kernel_nosync \tsk, \tmp1, \tmp2, \tmp3
29 isb
30alternative_else_nop_endif
31 .endm
32
33#else /* CONFIG_ARM64_PTR_AUTH_KERNEL */
34
35 .macro __ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3
36 .endm
37
38 .macro ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3
39 .endm
40
41 .macro ptrauth_keys_install_kernel tsk, tmp1, tmp2, tmp3
42 .endm
43
44#endif /* CONFIG_ARM64_PTR_AUTH_KERNEL */
45
46#ifdef CONFIG_ARM64_PTR_AUTH
47/*
48 * thread.keys_user.ap* as offset exceeds the #imm offset range
49 * so use the base value of ldp as thread.keys_user and offset as
50 * thread.keys_user.ap*.
51 */
52 .macro __ptrauth_keys_install_user tsk, tmp1, tmp2, tmp3
53 mov \tmp1, #THREAD_KEYS_USER
54 add \tmp1, \tsk, \tmp1
55 ldp \tmp2, \tmp3, [\tmp1, #PTRAUTH_USER_KEY_APIA]
56 msr_s SYS_APIAKEYLO_EL1, \tmp2
57 msr_s SYS_APIAKEYHI_EL1, \tmp3
58 .endm
59
60 .macro __ptrauth_keys_init_cpu tsk, tmp1, tmp2, tmp3
61 mrs \tmp1, id_aa64isar1_el1
62 ubfx \tmp1, \tmp1, #ID_AA64ISAR1_EL1_APA_SHIFT, #8
63 mrs_s \tmp2, SYS_ID_AA64ISAR2_EL1
64 ubfx \tmp2, \tmp2, #ID_AA64ISAR2_EL1_APA3_SHIFT, #4
65 orr \tmp1, \tmp1, \tmp2
66 cbz \tmp1, .Lno_addr_auth\@
67 mov_q \tmp1, (SCTLR_ELx_ENIA | SCTLR_ELx_ENIB | \
68 SCTLR_ELx_ENDA | SCTLR_ELx_ENDB)
69 mrs \tmp2, sctlr_el1
70 orr \tmp2, \tmp2, \tmp1
71 msr sctlr_el1, \tmp2
72 __ptrauth_keys_install_kernel_nosync \tsk, \tmp1, \tmp2, \tmp3
73 isb
74.Lno_addr_auth\@:
75 .endm
76
77 .macro ptrauth_keys_init_cpu tsk, tmp1, tmp2, tmp3
78alternative_if_not ARM64_HAS_ADDRESS_AUTH
79 b .Lno_addr_auth\@
80alternative_else_nop_endif
81 __ptrauth_keys_init_cpu \tsk, \tmp1, \tmp2, \tmp3
82.Lno_addr_auth\@:
83 .endm
84
85#else /* !CONFIG_ARM64_PTR_AUTH */
86
87 .macro ptrauth_keys_install_user tsk, tmp1, tmp2, tmp3
88 .endm
89
90#endif /* CONFIG_ARM64_PTR_AUTH */
91
92#endif /* __ASM_ASM_POINTER_AUTH_H */