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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Based on arch/arm/include/asm/thread_info.h
4 *
5 * Copyright (C) 2002 Russell King.
6 * Copyright (C) 2012 ARM Ltd.
7 */
8#ifndef __ASM_THREAD_INFO_H
9#define __ASM_THREAD_INFO_H
10
11#include <linux/compiler.h>
12
13#ifndef __ASSEMBLY__
14
15struct task_struct;
16
17#include <asm/memory.h>
18#include <asm/stack_pointer.h>
19#include <asm/types.h>
20
21/*
22 * low level task data that entry.S needs immediate access to.
23 */
24struct thread_info {
25 unsigned long flags; /* low level flags */
26#ifdef CONFIG_ARM64_SW_TTBR0_PAN
27 u64 ttbr0; /* saved TTBR0_EL1 */
28#endif
29 union {
30 u64 preempt_count; /* 0 => preemptible, <0 => bug */
31 struct {
32#ifdef CONFIG_CPU_BIG_ENDIAN
33 u32 need_resched;
34 u32 count;
35#else
36 u32 count;
37 u32 need_resched;
38#endif
39 } preempt;
40 };
41#ifdef CONFIG_SHADOW_CALL_STACK
42 void *scs_base;
43 void *scs_sp;
44#endif
45 u32 cpu;
46};
47
48#define thread_saved_pc(tsk) \
49 ((unsigned long)(tsk->thread.cpu_context.pc))
50#define thread_saved_sp(tsk) \
51 ((unsigned long)(tsk->thread.cpu_context.sp))
52#define thread_saved_fp(tsk) \
53 ((unsigned long)(tsk->thread.cpu_context.fp))
54
55void arch_setup_new_exec(void);
56#define arch_setup_new_exec arch_setup_new_exec
57
58void arch_release_task_struct(struct task_struct *tsk);
59int arch_dup_task_struct(struct task_struct *dst,
60 struct task_struct *src);
61
62#endif
63
64#define TIF_SIGPENDING 0 /* signal pending */
65#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
66#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
67#define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */
68#define TIF_UPROBE 4 /* uprobe breakpoint or singlestep */
69#define TIF_MTE_ASYNC_FAULT 5 /* MTE Asynchronous Tag Check Fault */
70#define TIF_NOTIFY_SIGNAL 6 /* signal notifications exist */
71#define TIF_SYSCALL_TRACE 8 /* syscall trace active */
72#define TIF_SYSCALL_AUDIT 9 /* syscall auditing */
73#define TIF_SYSCALL_TRACEPOINT 10 /* syscall tracepoint for ftrace */
74#define TIF_SECCOMP 11 /* syscall secure computing */
75#define TIF_SYSCALL_EMU 12 /* syscall emulation active */
76#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
77#define TIF_FREEZE 19
78#define TIF_RESTORE_SIGMASK 20
79#define TIF_SINGLESTEP 21
80#define TIF_32BIT 22 /* 32bit process */
81#define TIF_SVE 23 /* Scalable Vector Extension in use */
82#define TIF_SVE_VL_INHERIT 24 /* Inherit SVE vl_onexec across exec */
83#define TIF_SSBD 25 /* Wants SSB mitigation */
84#define TIF_TAGGED_ADDR 26 /* Allow tagged user addresses */
85#define TIF_SME 27 /* SME in use */
86#define TIF_SME_VL_INHERIT 28 /* Inherit SME vl_onexec across exec */
87
88#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
89#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
90#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
91#define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE)
92#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
93#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
94#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
95#define _TIF_SECCOMP (1 << TIF_SECCOMP)
96#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
97#define _TIF_UPROBE (1 << TIF_UPROBE)
98#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
99#define _TIF_32BIT (1 << TIF_32BIT)
100#define _TIF_SVE (1 << TIF_SVE)
101#define _TIF_MTE_ASYNC_FAULT (1 << TIF_MTE_ASYNC_FAULT)
102#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
103
104#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
105 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
106 _TIF_UPROBE | _TIF_MTE_ASYNC_FAULT | \
107 _TIF_NOTIFY_SIGNAL)
108
109#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
110 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
111 _TIF_SYSCALL_EMU)
112
113#ifdef CONFIG_SHADOW_CALL_STACK
114#define INIT_SCS \
115 .scs_base = init_shadow_call_stack, \
116 .scs_sp = init_shadow_call_stack,
117#else
118#define INIT_SCS
119#endif
120
121#define INIT_THREAD_INFO(tsk) \
122{ \
123 .flags = _TIF_FOREIGN_FPSTATE, \
124 .preempt_count = INIT_PREEMPT_COUNT, \
125 INIT_SCS \
126}
127
128#endif /* __ASM_THREAD_INFO_H */
1/*
2 * Based on arch/arm/include/asm/thread_info.h
3 *
4 * Copyright (C) 2002 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_THREAD_INFO_H
20#define __ASM_THREAD_INFO_H
21
22#ifdef __KERNEL__
23
24#include <linux/compiler.h>
25
26#ifndef CONFIG_ARM64_64K_PAGES
27#define THREAD_SIZE_ORDER 2
28#endif
29
30#define THREAD_SIZE 16384
31#define THREAD_START_SP (THREAD_SIZE - 16)
32
33#ifndef __ASSEMBLY__
34
35struct task_struct;
36struct exec_domain;
37
38#include <asm/types.h>
39
40typedef unsigned long mm_segment_t;
41
42/*
43 * low level task data that entry.S needs immediate access to.
44 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
45 */
46struct thread_info {
47 unsigned long flags; /* low level flags */
48 mm_segment_t addr_limit; /* address limit */
49 struct task_struct *task; /* main task structure */
50 struct exec_domain *exec_domain; /* execution domain */
51 struct restart_block restart_block;
52 int preempt_count; /* 0 => preemptable, <0 => bug */
53 int cpu; /* cpu */
54};
55
56#define INIT_THREAD_INFO(tsk) \
57{ \
58 .task = &tsk, \
59 .exec_domain = &default_exec_domain, \
60 .flags = 0, \
61 .preempt_count = INIT_PREEMPT_COUNT, \
62 .addr_limit = KERNEL_DS, \
63 .restart_block = { \
64 .fn = do_no_restart_syscall, \
65 }, \
66}
67
68#define init_thread_info (init_thread_union.thread_info)
69#define init_stack (init_thread_union.stack)
70
71/*
72 * how to get the thread information struct from C
73 */
74static inline struct thread_info *current_thread_info(void) __attribute_const__;
75
76static inline struct thread_info *current_thread_info(void)
77{
78 register unsigned long sp asm ("sp");
79 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
80}
81
82#define thread_saved_pc(tsk) \
83 ((unsigned long)(tsk->thread.cpu_context.pc))
84#define thread_saved_sp(tsk) \
85 ((unsigned long)(tsk->thread.cpu_context.sp))
86#define thread_saved_fp(tsk) \
87 ((unsigned long)(tsk->thread.cpu_context.fp))
88
89#endif
90
91/*
92 * thread information flags:
93 * TIF_SYSCALL_TRACE - syscall trace active
94 * TIF_SIGPENDING - signal pending
95 * TIF_NEED_RESCHED - rescheduling necessary
96 * TIF_NOTIFY_RESUME - callback before returning to user
97 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
98 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
99 */
100#define TIF_SIGPENDING 0
101#define TIF_NEED_RESCHED 1
102#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
103#define TIF_SYSCALL_TRACE 8
104#define TIF_POLLING_NRFLAG 16
105#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
106#define TIF_FREEZE 19
107#define TIF_RESTORE_SIGMASK 20
108#define TIF_SINGLESTEP 21
109#define TIF_32BIT 22 /* 32bit process */
110#define TIF_SWITCH_MM 23 /* deferred switch_mm */
111
112#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
113#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
114#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
115#define _TIF_32BIT (1 << TIF_32BIT)
116
117#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
118 _TIF_NOTIFY_RESUME)
119
120#endif /* __KERNEL__ */
121#endif /* __ASM_THREAD_INFO_H */