aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/include/asm/processor.h
blob: 120f4c9bbfde2a3fbade0fa5e611aca635bc6b82 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/*
 *  arch/arm/include/asm/processor.h
 *
 *  Copyright (C) 1995-1999 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __ASM_ARM_PROCESSOR_H
#define __ASM_ARM_PROCESSOR_H

#ifdef __KERNEL__

#include <asm/hw_breakpoint.h>
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/unified.h>

#ifdef __KERNEL__
#define STACK_TOP	((current->personality & ADDR_LIMIT_32BIT) ? \
			 TASK_SIZE : TASK_SIZE_26)
#define STACK_TOP_MAX	TASK_SIZE
#endif

struct debug_info {
#ifdef CONFIG_HAVE_HW_BREAKPOINT
	struct perf_event	*hbp[ARM_MAX_HBP_SLOTS];
#endif
};

struct thread_struct {
							/* fault info	  */
	unsigned long		address;
	unsigned long		trap_no;
	unsigned long		error_code;
							/* debugging	  */
	struct debug_info	debug;
};

/*
 * Everything usercopied to/from thread_struct is statically-sized, so
 * no hardened usercopy whitelist is needed.
 */
static inline void arch_thread_struct_whitelist(unsigned long *offset,
						unsigned long *size)
{
	*offset = *size = 0;
}

#define INIT_THREAD  {	}

#define start_thread(regs,pc,sp)					\
({									\
	unsigned long r7, r8, r9;					\
									\
	if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) {			\
		r7 = regs->ARM_r7;					\
		r8 = regs->ARM_r8;					\
		r9 = regs->ARM_r9;					\
	}								\
	memset(regs->uregs, 0, sizeof(regs->uregs));			\
	if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) &&			\
	    current->personality & FDPIC_FUNCPTRS) {			\
		regs->ARM_r7 = r7;					\
		regs->ARM_r8 = r8;					\
		regs->ARM_r9 = r9;					\
		regs->ARM_r10 = current->mm->start_data;		\
	} else if (!IS_ENABLED(CONFIG_MMU))				\
		regs->ARM_r10 = current->mm->start_data;		\
	if (current->personality & ADDR_LIMIT_32BIT)			\
		regs->ARM_cpsr = USR_MODE;				\
	else								\
		regs->ARM_cpsr = USR26_MODE;				\
	if (elf_hwcap & HWCAP_THUMB && pc & 1)				\
		regs->ARM_cpsr |= PSR_T_BIT;				\
	regs->ARM_cpsr |= PSR_ENDSTATE;					\
	regs->ARM_pc = pc & ~1;		/* pc */			\
	regs->ARM_sp = sp;		/* sp */			\
})

/* Forward declaration, a strange C thing */
struct task_struct;

/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);

unsigned long get_wchan(struct task_struct *p);

#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
#define cpu_relax()			smp_mb()
#else
#define cpu_relax()			barrier()
#endif

#define task_pt_regs(p) \
	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)

#define KSTK_EIP(tsk)	task_pt_regs(tsk)->ARM_pc
#define KSTK_ESP(tsk)	task_pt_regs(tsk)->ARM_sp

#ifdef CONFIG_SMP
#define __ALT_SMP_ASM(smp, up)						\
	"9998:	" smp "\n"						\
	"	.pushsection \".alt.smp.init\", \"a\"\n"		\
	"	.long	9998b\n"					\
	"	" up "\n"						\
	"	.popsection\n"
#else
#define __ALT_SMP_ASM(smp, up)	up
#endif

/*
 * Prefetching support - only ARMv5.
 */
#if __LINUX_ARM_ARCH__ >= 5

#define ARCH_HAS_PREFETCH
static inline void prefetch(const void *ptr)
{
	__asm__ __volatile__(
		"pld\t%a0"
		:: "p" (ptr));
}

#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
#define ARCH_HAS_PREFETCHW
static inline void prefetchw(const void *ptr)
{
	__asm__ __volatile__(
		".arch_extension	mp\n"
		__ALT_SMP_ASM(
			WASM(pldw)		"\t%a0",
			WASM(pld)		"\t%a0"
		)
		:: "p" (ptr));
}
#endif
#endif

#define HAVE_ARCH_PICK_MMAP_LAYOUT

#endif

#endif /* __ASM_ARM_PROCESSOR_H */

Privacy Policy