1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ALPHA_THREAD_INFO_H
3#define _ALPHA_THREAD_INFO_H
4
5#ifdef __KERNEL__
6
7#ifndef __ASSEMBLY__
8#include <asm/processor.h>
9#include <asm/types.h>
10#include <asm/hwrpb.h>
11#include <asm/sysinfo.h>
12#endif
13
14#ifndef __ASSEMBLY__
15struct thread_info {
16	struct pcb_struct	pcb;		/* palcode state */
17
18	struct task_struct	*task;		/* main task structure */
19	unsigned int		flags;		/* low level flags */
20	unsigned int		ieee_state;	/* see fpu.h */
21
22	mm_segment_t		addr_limit;	/* thread address space */
23	unsigned		cpu;		/* current CPU */
24	int			preempt_count; /* 0 => preemptable, <0 => BUG */
25	unsigned int		status;		/* thread-synchronous flags */
26
27	int bpt_nsaved;
28	unsigned long bpt_addr[2];		/* breakpoint handling  */
29	unsigned int bpt_insn[2];
30};
31
32/*
33 * Macros/functions for gaining access to the thread information structure.
34 */
35#define INIT_THREAD_INFO(tsk)			\
36{						\
37	.task		= &tsk,			\
38	.addr_limit	= KERNEL_DS,		\
39	.preempt_count	= INIT_PREEMPT_COUNT,	\
40}
41
42/* How to get the thread information struct from C.  */
43register struct thread_info *__current_thread_info __asm__("$8");
44#define current_thread_info()  __current_thread_info
45
46#endif /* __ASSEMBLY__ */
47
48/* Thread information allocation.  */
49#define THREAD_SIZE_ORDER 1
50#define THREAD_SIZE (2*PAGE_SIZE)
51
52/*
53 * Thread information flags:
54 * - these are process state flags and used from assembly
55 * - pending work-to-be-done flags come first and must be assigned to be
56 *   within bits 0 to 7 to fit in and immediate operand.
57 *
58 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
59 */
60#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
61#define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
62#define TIF_SIGPENDING		2	/* signal pending */
63#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
64#define TIF_SYSCALL_AUDIT	4	/* syscall audit active */
65#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
66#define TIF_DIE_IF_KERNEL	9	/* dik recursion lock */
67#define TIF_MEMDIE		13	/* is terminating due to OOM killer */
68#define TIF_POLLING_NRFLAG	14	/* idle is polling for TIF_NEED_RESCHED */
69
70#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
71#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
72#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
73#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
74#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
75#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
76#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
77
78/* Work to do on interrupt/exception return.  */
79#define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
80				 _TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL)
81
82/* Work to do on any return to userspace.  */
83#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK		\
84				 | _TIF_SYSCALL_TRACE)
85
86#define TS_UAC_NOPRINT		0x0001	/* ! Preserve the following three */
87#define TS_UAC_NOFIX		0x0002	/* ! flags as they match          */
88#define TS_UAC_SIGBUS		0x0004	/* ! userspace part of 'osf_sysinfo' */
89
90#define SET_UNALIGN_CTL(task,value)	({				\
91	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
92	if (value & PR_UNALIGN_NOPRINT)					\
93		status |= TS_UAC_NOPRINT;				\
94	if (value & PR_UNALIGN_SIGBUS)					\
95		status |= TS_UAC_SIGBUS;				\
96	if (value & 4)	/* alpha-specific */				\
97		status |= TS_UAC_NOFIX;					\
98	task_thread_info(task)->status = status;			\
99	0; })
100
101#define GET_UNALIGN_CTL(task,value)	({				\
102	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
103	__u32 res = 0;							\
104	if (status & TS_UAC_NOPRINT)					\
105		res |= PR_UNALIGN_NOPRINT;				\
106	if (status & TS_UAC_SIGBUS)					\
107		res |= PR_UNALIGN_SIGBUS;				\
108	if (status & TS_UAC_NOFIX)					\
109		res |= 4;						\
110	put_user(res, (int __user *)(value));				\
111	})
112
113#endif /* __KERNEL__ */
114#endif /* _ALPHA_THREAD_INFO_H */
115