1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  *  S390 version
4  *    Copyright IBM Corp. 2002, 2006
5  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
6  */
7 
8 #ifndef _ASM_THREAD_INFO_H
9 #define _ASM_THREAD_INFO_H
10 
11 #include <linux/bits.h>
12 
13 /*
14  * General size of kernel stacks
15  */
16 #ifdef CONFIG_KASAN
17 #define THREAD_SIZE_ORDER 4
18 #else
19 #define THREAD_SIZE_ORDER 2
20 #endif
21 #define BOOT_STACK_SIZE (PAGE_SIZE << 2)
22 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
23 
24 #ifndef __ASSEMBLY__
25 #include <asm/lowcore.h>
26 #include <asm/page.h>
27 
28 #define STACK_INIT_OFFSET \
29 	(THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs))
30 
31 /*
32  * low level task data that entry.S needs immediate access to
33  * - this struct should fit entirely inside of one cache line
34  * - this struct shares the supervisor stack pages
35  * - if the contents of this structure are changed, the assembly constants must also be changed
36  */
37 struct thread_info {
38 	unsigned long		flags;		/* low level flags */
39 	unsigned long		syscall_work;	/* SYSCALL_WORK_ flags */
40 };
41 
42 /*
43  * macros/functions for gaining access to the thread information structure
44  */
45 #define INIT_THREAD_INFO(tsk)			\
46 {						\
47 	.flags		= 0,			\
48 }
49 
50 struct task_struct;
51 
52 void arch_release_task_struct(struct task_struct *tsk);
53 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
54 
55 void arch_setup_new_exec(void);
56 #define arch_setup_new_exec arch_setup_new_exec
57 
58 #endif
59 
60 /*
61  * thread information flags bit numbers
62  */
63 /* _TIF_WORK bits */
64 #define TIF_NOTIFY_RESUME	0	/* callback before returning to user */
65 #define TIF_SIGPENDING		1	/* signal pending */
66 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
67 #define TIF_UPROBE		3	/* breakpointed or single-stepping */
68 #define TIF_GUARDED_STORAGE	4	/* load guarded storage control block */
69 #define TIF_PATCH_PENDING	5	/* pending live patching update */
70 #define TIF_PGSTE		6	/* New mm's will use 4K page tables */
71 #define TIF_NOTIFY_SIGNAL	7	/* signal notifications exist */
72 #define TIF_ISOLATE_BP		8	/* Run process with isolated BP */
73 #define TIF_ISOLATE_BP_GUEST	9	/* Run KVM guests with isolated BP */
74 #define TIF_PER_TRAP		10	/* Need to handle PER trap on exit to usermode */
75 
76 #define TIF_31BIT		16	/* 32bit process */
77 #define TIF_MEMDIE		17	/* is terminating due to OOM killer */
78 #define TIF_RESTORE_SIGMASK	18	/* restore signal mask in do_signal() */
79 #define TIF_SINGLE_STEP		19	/* This task is single stepped */
80 #define TIF_BLOCK_STEP		20	/* This task is block stepped */
81 #define TIF_UPROBE_SINGLESTEP	21	/* This task is uprobe single stepped */
82 
83 /* _TIF_TRACE bits */
84 #define TIF_SYSCALL_TRACE	24	/* syscall trace active */
85 #define TIF_SYSCALL_AUDIT	25	/* syscall auditing active */
86 #define TIF_SECCOMP		26	/* secure computing */
87 #define TIF_SYSCALL_TRACEPOINT	27	/* syscall tracepoint instrumentation */
88 
89 #define _TIF_NOTIFY_RESUME	BIT(TIF_NOTIFY_RESUME)
90 #define _TIF_NOTIFY_SIGNAL	BIT(TIF_NOTIFY_SIGNAL)
91 #define _TIF_SIGPENDING		BIT(TIF_SIGPENDING)
92 #define _TIF_NEED_RESCHED	BIT(TIF_NEED_RESCHED)
93 #define _TIF_UPROBE		BIT(TIF_UPROBE)
94 #define _TIF_GUARDED_STORAGE	BIT(TIF_GUARDED_STORAGE)
95 #define _TIF_PATCH_PENDING	BIT(TIF_PATCH_PENDING)
96 #define _TIF_ISOLATE_BP		BIT(TIF_ISOLATE_BP)
97 #define _TIF_ISOLATE_BP_GUEST	BIT(TIF_ISOLATE_BP_GUEST)
98 #define _TIF_PER_TRAP		BIT(TIF_PER_TRAP)
99 
100 #define _TIF_31BIT		BIT(TIF_31BIT)
101 #define _TIF_SINGLE_STEP	BIT(TIF_SINGLE_STEP)
102 
103 #define _TIF_SYSCALL_TRACE	BIT(TIF_SYSCALL_TRACE)
104 #define _TIF_SYSCALL_AUDIT	BIT(TIF_SYSCALL_AUDIT)
105 #define _TIF_SECCOMP		BIT(TIF_SECCOMP)
106 #define _TIF_SYSCALL_TRACEPOINT	BIT(TIF_SYSCALL_TRACEPOINT)
107 
108 #endif /* _ASM_THREAD_INFO_H */
109