Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
1da177e4 | 2 | /* |
4baa9922 | 3 | * arch/arm/include/asm/processor.h |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 1995-1999 Russell King | |
1da177e4 LT |
6 | */ |
7 | ||
8 | #ifndef __ASM_ARM_PROCESSOR_H | |
9 | #define __ASM_ARM_PROCESSOR_H | |
10 | ||
1da177e4 LT |
11 | #ifdef __KERNEL__ |
12 | ||
864232fa | 13 | #include <asm/hw_breakpoint.h> |
1da177e4 | 14 | #include <asm/ptrace.h> |
1da177e4 | 15 | #include <asm/types.h> |
27a84793 | 16 | #include <asm/unified.h> |
1da177e4 | 17 | |
922a70d3 | 18 | #ifdef __KERNEL__ |
794baba6 | 19 | #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ |
922a70d3 DH |
20 | TASK_SIZE : TASK_SIZE_26) |
21 | #define STACK_TOP_MAX TASK_SIZE | |
22 | #endif | |
23 | ||
1da177e4 | 24 | struct debug_info { |
864232fa WD |
25 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
26 | struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; | |
27 | #endif | |
1da177e4 LT |
28 | }; |
29 | ||
30 | struct thread_struct { | |
31 | /* fault info */ | |
32 | unsigned long address; | |
33 | unsigned long trap_no; | |
34 | unsigned long error_code; | |
35 | /* debugging */ | |
36 | struct debug_info debug; | |
37 | }; | |
38 | ||
08626a60 KC |
39 | /* |
40 | * Everything usercopied to/from thread_struct is statically-sized, so | |
41 | * no hardened usercopy whitelist is needed. | |
42 | */ | |
43 | static inline void arch_thread_struct_whitelist(unsigned long *offset, | |
44 | unsigned long *size) | |
45 | { | |
46 | *offset = *size = 0; | |
47 | } | |
48 | ||
1da177e4 LT |
49 | #define INIT_THREAD { } |
50 | ||
51 | #define start_thread(regs,pc,sp) \ | |
52 | ({ \ | |
5e588114 NP |
53 | unsigned long r7, r8, r9; \ |
54 | \ | |
55 | if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) { \ | |
56 | r7 = regs->ARM_r7; \ | |
57 | r8 = regs->ARM_r8; \ | |
58 | r9 = regs->ARM_r9; \ | |
59 | } \ | |
59f0cb0f | 60 | memset(regs->uregs, 0, sizeof(regs->uregs)); \ |
5e588114 NP |
61 | if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) && \ |
62 | current->personality & FDPIC_FUNCPTRS) { \ | |
63 | regs->ARM_r7 = r7; \ | |
64 | regs->ARM_r8 = r8; \ | |
65 | regs->ARM_r9 = r9; \ | |
66 | regs->ARM_r10 = current->mm->start_data; \ | |
67 | } else if (!IS_ENABLED(CONFIG_MMU)) \ | |
68 | regs->ARM_r10 = current->mm->start_data; \ | |
1da177e4 LT |
69 | if (current->personality & ADDR_LIMIT_32BIT) \ |
70 | regs->ARM_cpsr = USR_MODE; \ | |
71 | else \ | |
72 | regs->ARM_cpsr = USR26_MODE; \ | |
73 | if (elf_hwcap & HWCAP_THUMB && pc & 1) \ | |
74 | regs->ARM_cpsr |= PSR_T_BIT; \ | |
26584853 | 75 | regs->ARM_cpsr |= PSR_ENDSTATE; \ |
1da177e4 LT |
76 | regs->ARM_pc = pc & ~1; /* pc */ \ |
77 | regs->ARM_sp = sp; /* sp */ \ | |
1da177e4 LT |
78 | }) |
79 | ||
80 | /* Forward declaration, a strange C thing */ | |
81 | struct task_struct; | |
82 | ||
83 | /* Free all resources held by a thread. */ | |
84 | extern void release_thread(struct task_struct *); | |
85 | ||
1da177e4 LT |
86 | unsigned long get_wchan(struct task_struct *p); |
87 | ||
5dab26af | 88 | #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327) |
5388a5b8 RK |
89 | #define cpu_relax() \ |
90 | do { \ | |
91 | smp_mb(); \ | |
92 | __asm__ __volatile__("nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;"); \ | |
93 | } while (0) | |
534be1d5 | 94 | #else |
1da177e4 | 95 | #define cpu_relax() barrier() |
534be1d5 | 96 | #endif |
1da177e4 | 97 | |
815d5ec8 | 98 | #define task_pt_regs(p) \ |
32d39a93 | 99 | ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) |
815d5ec8 AV |
100 | |
101 | #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc | |
102 | #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp | |
1da177e4 | 103 | |
27a84793 WD |
104 | #ifdef CONFIG_SMP |
105 | #define __ALT_SMP_ASM(smp, up) \ | |
106 | "9998: " smp "\n" \ | |
107 | " .pushsection \".alt.smp.init\", \"a\"\n" \ | |
108 | " .long 9998b\n" \ | |
109 | " " up "\n" \ | |
110 | " .popsection\n" | |
111 | #else | |
112 | #define __ALT_SMP_ASM(smp, up) up | |
113 | #endif | |
114 | ||
1da177e4 LT |
115 | /* |
116 | * Prefetching support - only ARMv5. | |
117 | */ | |
118 | #if __LINUX_ARM_ARCH__ >= 5 | |
119 | ||
120 | #define ARCH_HAS_PREFETCH | |
02828845 NP |
121 | static inline void prefetch(const void *ptr) |
122 | { | |
123 | __asm__ __volatile__( | |
16f719de | 124 | "pld\t%a0" |
e744dff7 | 125 | :: "p" (ptr)); |
02828845 | 126 | } |
1da177e4 | 127 | |
d8f57aa4 | 128 | #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP) |
1da177e4 | 129 | #define ARCH_HAS_PREFETCHW |
d8f57aa4 WD |
130 | static inline void prefetchw(const void *ptr) |
131 | { | |
132 | __asm__ __volatile__( | |
133 | ".arch_extension mp\n" | |
134 | __ALT_SMP_ASM( | |
43947b88 SA |
135 | "pldw\t%a0", |
136 | "pld\t%a0" | |
d8f57aa4 WD |
137 | ) |
138 | :: "p" (ptr)); | |
139 | } | |
140 | #endif | |
1da177e4 LT |
141 | #endif |
142 | ||
7dbaa466 RH |
143 | #define HAVE_ARCH_PICK_MMAP_LAYOUT |
144 | ||
1da177e4 LT |
145 | #endif |
146 | ||
147 | #endif /* __ASM_ARM_PROCESSOR_H */ |