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1/*
2 * arch/arm/include/asm/processor.h
3 *
4 * Copyright (C) 1995-1999 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#ifndef __ASM_ARM_PROCESSOR_H
12#define __ASM_ARM_PROCESSOR_H
13
14/*
15 * Default implementation of macro that returns current
16 * instruction pointer ("program counter").
17 */
18#define current_text_addr() ({ __label__ _l; _l: &&_l;})
19
20#ifdef __KERNEL__
21
22#include <asm/hw_breakpoint.h>
23#include <asm/ptrace.h>
24#include <asm/types.h>
25#include <asm/unified.h>
26
27#ifdef __KERNEL__
28#define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
29 TASK_SIZE : TASK_SIZE_26)
30#define STACK_TOP_MAX TASK_SIZE
31#endif
32
33struct debug_info {
34#ifdef CONFIG_HAVE_HW_BREAKPOINT
35 struct perf_event *hbp[ARM_MAX_HBP_SLOTS];
36#endif
37};
38
39struct thread_struct {
40 /* fault info */
41 unsigned long address;
42 unsigned long trap_no;
43 unsigned long error_code;
44 /* debugging */
45 struct debug_info debug;
46};
47
48#define INIT_THREAD { }
49
50#define start_thread(regs,pc,sp) \
51({ \
52 unsigned long r7, r8, r9; \
53 \
54 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) { \
55 r7 = regs->ARM_r7; \
56 r8 = regs->ARM_r8; \
57 r9 = regs->ARM_r9; \
58 } \
59 memset(regs->uregs, 0, sizeof(regs->uregs)); \
60 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) && \
61 current->personality & FDPIC_FUNCPTRS) { \
62 regs->ARM_r7 = r7; \
63 regs->ARM_r8 = r8; \
64 regs->ARM_r9 = r9; \
65 regs->ARM_r10 = current->mm->start_data; \
66 } else if (!IS_ENABLED(CONFIG_MMU)) \
67 regs->ARM_r10 = current->mm->start_data; \
68 if (current->personality & ADDR_LIMIT_32BIT) \
69 regs->ARM_cpsr = USR_MODE; \
70 else \
71 regs->ARM_cpsr = USR26_MODE; \
72 if (elf_hwcap & HWCAP_THUMB && pc & 1) \
73 regs->ARM_cpsr |= PSR_T_BIT; \
74 regs->ARM_cpsr |= PSR_ENDSTATE; \
75 regs->ARM_pc = pc & ~1; /* pc */ \
76 regs->ARM_sp = sp; /* sp */ \
77})
78
79/* Forward declaration, a strange C thing */
80struct task_struct;
81
82/* Free all resources held by a thread. */
83extern void release_thread(struct task_struct *);
84
85unsigned long get_wchan(struct task_struct *p);
86
87#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
88#define cpu_relax() smp_mb()
89#else
90#define cpu_relax() barrier()
91#endif
92
93#define task_pt_regs(p) \
94 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
95
96#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
97#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
98
99#ifdef CONFIG_SMP
100#define __ALT_SMP_ASM(smp, up) \
101 "9998: " smp "\n" \
102 " .pushsection \".alt.smp.init\", \"a\"\n" \
103 " .long 9998b\n" \
104 " " up "\n" \
105 " .popsection\n"
106#else
107#define __ALT_SMP_ASM(smp, up) up
108#endif
109
110/*
111 * Prefetching support - only ARMv5.
112 */
113#if __LINUX_ARM_ARCH__ >= 5
114
115#define ARCH_HAS_PREFETCH
116static inline void prefetch(const void *ptr)
117{
118 __asm__ __volatile__(
119 "pld\t%a0"
120 :: "p" (ptr));
121}
122
123#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
124#define ARCH_HAS_PREFETCHW
125static inline void prefetchw(const void *ptr)
126{
127 __asm__ __volatile__(
128 ".arch_extension mp\n"
129 __ALT_SMP_ASM(
130 WASM(pldw) "\t%a0",
131 WASM(pld) "\t%a0"
132 )
133 :: "p" (ptr));
134}
135#endif
136#endif
137
138#define HAVE_ARCH_PICK_MMAP_LAYOUT
139
140#endif
141
142#endif /* __ASM_ARM_PROCESSOR_H */