• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 #ifndef _ALPHA_THREAD_INFO_H
2 #define _ALPHA_THREAD_INFO_H
3 
4 #ifdef __KERNEL__
5 
6 #ifndef __ASSEMBLY__
7 #include <asm/processor.h>
8 #include <asm/types.h>
9 #include <asm/hwrpb.h>
10 #include <asm/sysinfo.h>
11 #endif
12 
13 #ifndef __ASSEMBLY__
14 struct thread_info {
15 	struct pcb_struct	pcb;		/* palcode state */
16 
17 	struct task_struct	*task;		/* main task structure */
18 	unsigned int		flags;		/* low level flags */
19 	unsigned int		ieee_state;	/* see fpu.h */
20 
21 	mm_segment_t		addr_limit;	/* thread address space */
22 	unsigned		cpu;		/* current CPU */
23 	int			preempt_count; /* 0 => preemptable, <0 => BUG */
24 	unsigned int		status;		/* thread-synchronous flags */
25 
26 	int bpt_nsaved;
27 	unsigned long bpt_addr[2];		/* breakpoint handling  */
28 	unsigned int bpt_insn[2];
29 };
30 
31 /*
32  * Macros/functions for gaining access to the thread information structure.
33  */
34 #define INIT_THREAD_INFO(tsk)			\
35 {						\
36 	.task		= &tsk,			\
37 	.addr_limit	= KERNEL_DS,		\
38 	.preempt_count	= INIT_PREEMPT_COUNT,	\
39 }
40 
41 #define init_thread_info	(init_thread_union.thread_info)
42 #define init_stack		(init_thread_union.stack)
43 
44 /* How to get the thread information struct from C.  */
45 register struct thread_info *__current_thread_info __asm__("$8");
46 #define current_thread_info()  __current_thread_info
47 
48 #endif /* __ASSEMBLY__ */
49 
50 /* Thread information allocation.  */
51 #define THREAD_SIZE_ORDER 1
52 #define THREAD_SIZE (2*PAGE_SIZE)
53 
54 /*
55  * Thread information flags:
56  * - these are process state flags and used from assembly
57  * - pending work-to-be-done flags come first and must be assigned to be
58  *   within bits 0 to 7 to fit in and immediate operand.
59  *
60  * TIF_SYSCALL_TRACE is known to be 0 via blbs.
61  */
62 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
63 #define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
64 #define TIF_SIGPENDING		2	/* signal pending */
65 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
66 #define TIF_SYSCALL_AUDIT	4	/* syscall audit active */
67 #define TIF_DIE_IF_KERNEL	9	/* dik recursion lock */
68 #define TIF_MEMDIE		13	/* is terminating due to OOM killer */
69 #define TIF_POLLING_NRFLAG	14	/* idle is polling for TIF_NEED_RESCHED */
70 
71 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
72 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
73 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
74 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
75 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
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)
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 #define TS_RESTORE_SIGMASK	0x0008	/* restore signal mask in do_signal() */
90 
91 #ifndef __ASSEMBLY__
92 #define HAVE_SET_RESTORE_SIGMASK	1
set_restore_sigmask(void)93 static inline void set_restore_sigmask(void)
94 {
95 	struct thread_info *ti = current_thread_info();
96 	ti->status |= TS_RESTORE_SIGMASK;
97 	WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
98 }
clear_restore_sigmask(void)99 static inline void clear_restore_sigmask(void)
100 {
101 	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
102 }
test_restore_sigmask(void)103 static inline bool test_restore_sigmask(void)
104 {
105 	return current_thread_info()->status & TS_RESTORE_SIGMASK;
106 }
test_and_clear_restore_sigmask(void)107 static inline bool test_and_clear_restore_sigmask(void)
108 {
109 	struct thread_info *ti = current_thread_info();
110 	if (!(ti->status & TS_RESTORE_SIGMASK))
111 		return false;
112 	ti->status &= ~TS_RESTORE_SIGMASK;
113 	return true;
114 }
115 #endif
116 
117 #define SET_UNALIGN_CTL(task,value)	({				\
118 	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
119 	if (value & PR_UNALIGN_NOPRINT)					\
120 		status |= TS_UAC_NOPRINT;				\
121 	if (value & PR_UNALIGN_SIGBUS)					\
122 		status |= TS_UAC_SIGBUS;				\
123 	if (value & 4)	/* alpha-specific */				\
124 		status |= TS_UAC_NOFIX;					\
125 	task_thread_info(task)->status = status;			\
126 	0; })
127 
128 #define GET_UNALIGN_CTL(task,value)	({				\
129 	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
130 	__u32 res = 0;							\
131 	if (status & TS_UAC_NOPRINT)					\
132 		res |= PR_UNALIGN_NOPRINT;				\
133 	if (status & TS_UAC_SIGBUS)					\
134 		res |= PR_UNALIGN_SIGBUS;				\
135 	if (status & TS_UAC_NOFIX)					\
136 		res |= 4;						\
137 	put_user(res, (int __user *)(value));				\
138 	})
139 
140 #endif /* __KERNEL__ */
141 #endif /* _ALPHA_THREAD_INFO_H */
142