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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef _ASM_POWERPC_KUP_BOOKE_H_ |
| 3 | #define _ASM_POWERPC_KUP_BOOKE_H_ |
| 4 | |
| 5 | #include <asm/bug.h> |
| 6 | #include <asm/mmu.h> |
| 7 | |
| 8 | #ifdef CONFIG_PPC_KUAP |
| 9 | |
| 10 | #ifdef __ASSEMBLY__ |
| 11 | |
| 12 | .macro kuap_check_amr gpr1, gpr2 |
| 13 | .endm |
| 14 | |
| 15 | #else |
| 16 | |
| 17 | #include <linux/sched.h> |
| 18 | |
| 19 | #include <asm/reg.h> |
| 20 | |
| 21 | static __always_inline void __kuap_lock(void) |
| 22 | { |
| 23 | mtspr(SPRN_PID, 0); |
| 24 | isync(); |
| 25 | } |
| 26 | #define __kuap_lock __kuap_lock |
| 27 | |
| 28 | static __always_inline void __kuap_save_and_lock(struct pt_regs *regs) |
| 29 | { |
| 30 | regs->kuap = mfspr(SPRN_PID); |
| 31 | mtspr(SPRN_PID, 0); |
| 32 | isync(); |
| 33 | } |
| 34 | #define __kuap_save_and_lock __kuap_save_and_lock |
| 35 | |
| 36 | static __always_inline void kuap_user_restore(struct pt_regs *regs) |
| 37 | { |
| 38 | if (kuap_is_disabled()) |
| 39 | return; |
| 40 | |
| 41 | mtspr(SPRN_PID, current->thread.pid); |
| 42 | |
| 43 | /* Context synchronisation is performed by rfi */ |
| 44 | } |
| 45 | |
| 46 | static __always_inline void __kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap) |
| 47 | { |
| 48 | if (regs->kuap) |
| 49 | mtspr(SPRN_PID, current->thread.pid); |
| 50 | |
| 51 | /* Context synchronisation is performed by rfi */ |
| 52 | } |
| 53 | |
| 54 | #ifdef CONFIG_PPC_KUAP_DEBUG |
| 55 | static __always_inline unsigned long __kuap_get_and_assert_locked(void) |
| 56 | { |
| 57 | WARN_ON_ONCE(mfspr(SPRN_PID)); |
| 58 | |
| 59 | return 0; |
| 60 | } |
| 61 | #define __kuap_get_and_assert_locked __kuap_get_and_assert_locked |
| 62 | #endif |
| 63 | |
| 64 | static __always_inline void uaccess_begin_booke(unsigned long val) |
| 65 | { |
| 66 | asm(ASM_MMU_FTR_IFSET("mtspr %0, %1; isync", "", %2) : : |
| 67 | "i"(SPRN_PID), "r"(val), "i"(MMU_FTR_KUAP) : "memory"); |
| 68 | } |
| 69 | |
| 70 | static __always_inline void uaccess_end_booke(void) |
| 71 | { |
| 72 | asm(ASM_MMU_FTR_IFSET("mtspr %0, %1; isync", "", %2) : : |
| 73 | "i"(SPRN_PID), "r"(0), "i"(MMU_FTR_KUAP) : "memory"); |
| 74 | } |
| 75 | |
| 76 | static __always_inline void allow_user_access(void __user *to, const void __user *from, |
| 77 | unsigned long size, unsigned long dir) |
| 78 | { |
| 79 | uaccess_begin_booke(current->thread.pid); |
| 80 | } |
| 81 | |
| 82 | static __always_inline void prevent_user_access(unsigned long dir) |
| 83 | { |
| 84 | uaccess_end_booke(); |
| 85 | } |
| 86 | |
| 87 | static __always_inline unsigned long prevent_user_access_return(void) |
| 88 | { |
| 89 | unsigned long flags = mfspr(SPRN_PID); |
| 90 | |
| 91 | uaccess_end_booke(); |
| 92 | |
| 93 | return flags; |
| 94 | } |
| 95 | |
| 96 | static __always_inline void restore_user_access(unsigned long flags) |
| 97 | { |
| 98 | if (flags) |
| 99 | uaccess_begin_booke(current->thread.pid); |
| 100 | } |
| 101 | |
| 102 | static __always_inline bool |
| 103 | __bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write) |
| 104 | { |
| 105 | return !regs->kuap; |
| 106 | } |
| 107 | |
| 108 | #endif /* !__ASSEMBLY__ */ |
| 109 | |
| 110 | #endif /* CONFIG_PPC_KUAP */ |
| 111 | |
| 112 | #endif /* _ASM_POWERPC_KUP_BOOKE_H_ */ |
| 113 |
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