Linux kernel mirror (for testing)
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1/*
2 * Based on arch/arm/include/asm/processor.h
3 *
4 * Copyright (C) 1995-1999 Russell King
5 * Copyright (C) 2012 ARM Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19#ifndef __ASM_PROCESSOR_H
20#define __ASM_PROCESSOR_H
21
22/*
23 * Default implementation of macro that returns current
24 * instruction pointer ("program counter").
25 */
26#define current_text_addr() ({ __label__ _l; _l: &&_l;})
27
28#ifdef __KERNEL__
29
30#include <linux/string.h>
31
32#include <asm/alternative.h>
33#include <asm/fpsimd.h>
34#include <asm/hw_breakpoint.h>
35#include <asm/lse.h>
36#include <asm/pgtable-hwdef.h>
37#include <asm/ptrace.h>
38#include <asm/types.h>
39
40#ifdef __KERNEL__
41#define STACK_TOP_MAX TASK_SIZE_64
42#ifdef CONFIG_COMPAT
43#define AARCH32_VECTORS_BASE 0xffff0000
44#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
45 AARCH32_VECTORS_BASE : STACK_TOP_MAX)
46#else
47#define STACK_TOP STACK_TOP_MAX
48#endif /* CONFIG_COMPAT */
49
50extern phys_addr_t arm64_dma_phys_limit;
51#define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1)
52#endif /* __KERNEL__ */
53
54struct debug_info {
55 /* Have we suspended stepping by a debugger? */
56 int suspended_step;
57 /* Allow breakpoints and watchpoints to be disabled for this thread. */
58 int bps_disabled;
59 int wps_disabled;
60 /* Hardware breakpoints pinned to this task. */
61 struct perf_event *hbp_break[ARM_MAX_BRP];
62 struct perf_event *hbp_watch[ARM_MAX_WRP];
63};
64
65struct cpu_context {
66 unsigned long x19;
67 unsigned long x20;
68 unsigned long x21;
69 unsigned long x22;
70 unsigned long x23;
71 unsigned long x24;
72 unsigned long x25;
73 unsigned long x26;
74 unsigned long x27;
75 unsigned long x28;
76 unsigned long fp;
77 unsigned long sp;
78 unsigned long pc;
79};
80
81struct thread_struct {
82 struct cpu_context cpu_context; /* cpu context */
83 unsigned long tp_value; /* TLS register */
84#ifdef CONFIG_COMPAT
85 unsigned long tp2_value;
86#endif
87 struct fpsimd_state fpsimd_state;
88 unsigned long fault_address; /* fault info */
89 unsigned long fault_code; /* ESR_EL1 value */
90 struct debug_info debug; /* debugging */
91};
92
93#ifdef CONFIG_COMPAT
94#define task_user_tls(t) \
95({ \
96 unsigned long *__tls; \
97 if (is_compat_thread(task_thread_info(t))) \
98 __tls = &(t)->thread.tp2_value; \
99 else \
100 __tls = &(t)->thread.tp_value; \
101 __tls; \
102 })
103#else
104#define task_user_tls(t) (&(t)->thread.tp_value)
105#endif
106
107#define INIT_THREAD { }
108
109static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
110{
111 memset(regs, 0, sizeof(*regs));
112 regs->syscallno = ~0UL;
113 regs->pc = pc;
114}
115
116static inline void start_thread(struct pt_regs *regs, unsigned long pc,
117 unsigned long sp)
118{
119 start_thread_common(regs, pc);
120 regs->pstate = PSR_MODE_EL0t;
121 regs->sp = sp;
122}
123
124#ifdef CONFIG_COMPAT
125static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
126 unsigned long sp)
127{
128 start_thread_common(regs, pc);
129 regs->pstate = COMPAT_PSR_MODE_USR;
130 if (pc & 1)
131 regs->pstate |= COMPAT_PSR_T_BIT;
132
133#ifdef __AARCH64EB__
134 regs->pstate |= COMPAT_PSR_E_BIT;
135#endif
136
137 regs->compat_sp = sp;
138}
139#endif
140
141/* Forward declaration, a strange C thing */
142struct task_struct;
143
144/* Free all resources held by a thread. */
145extern void release_thread(struct task_struct *);
146
147unsigned long get_wchan(struct task_struct *p);
148
149static inline void cpu_relax(void)
150{
151 asm volatile("yield" ::: "memory");
152}
153
154#define cpu_relax_lowlatency() cpu_relax()
155
156/* Thread switching */
157extern struct task_struct *cpu_switch_to(struct task_struct *prev,
158 struct task_struct *next);
159
160#define task_pt_regs(p) \
161 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
162
163#define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
164#define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
165
166/*
167 * Prefetching support
168 */
169#define ARCH_HAS_PREFETCH
170static inline void prefetch(const void *ptr)
171{
172 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
173}
174
175#define ARCH_HAS_PREFETCHW
176static inline void prefetchw(const void *ptr)
177{
178 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
179}
180
181#define ARCH_HAS_SPINLOCK_PREFETCH
182static inline void spin_lock_prefetch(const void *ptr)
183{
184 asm volatile(ARM64_LSE_ATOMIC_INSN(
185 "prfm pstl1strm, %a0",
186 "nop") : : "p" (ptr));
187}
188
189#define HAVE_ARCH_PICK_MMAP_LAYOUT
190
191#endif
192
193void cpu_enable_pan(void *__unused);
194void cpu_enable_uao(void *__unused);
195
196#endif /* __ASM_PROCESSOR_H */