1 /* thread_info.h: Meta low-level thread information
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
6 * Meta port by Imagination Technologies
9 #ifndef _ASM_THREAD_INFO_H
10 #define _ASM_THREAD_INFO_H
12 #include <linux/compiler.h>
16 #include <asm/processor.h>
20 * low level task data that entry.S needs immediate access to
21 * - this struct should fit entirely inside of one cache line
22 * - this struct shares the supervisor stack pages
23 * - if the contents of this structure are changed, the assembly constants must
28 /* This must be 8 byte aligned so we can ensure stack alignment. */
30 struct task_struct *task; /* main task structure */
31 struct exec_domain *exec_domain; /* execution domain */
32 unsigned long flags; /* low level flags */
33 unsigned long status; /* thread-synchronous flags */
34 u32 cpu; /* current CPU */
35 int preempt_count; /* 0 => preemptable, <0 => BUG */
37 mm_segment_t addr_limit; /* thread address space */
39 u8 supervisor_stack[0] __aligned(8);
42 #else /* !__ASSEMBLY__ */
44 #include <generated/asm-offsets.h>
48 #ifdef CONFIG_4KSTACKS
49 #define THREAD_SHIFT 12
51 #define THREAD_SHIFT 13
54 #if THREAD_SHIFT >= PAGE_SHIFT
55 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
57 #define THREAD_SIZE_ORDER 0
60 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
62 #define STACK_WARN (THREAD_SIZE/8)
64 * macros/functions for gaining access to the thread information structure
68 #define INIT_THREAD_INFO(tsk) \
71 .exec_domain = &default_exec_domain, \
74 .preempt_count = INIT_PREEMPT_COUNT, \
75 .addr_limit = KERNEL_DS, \
78 #define init_thread_info (init_thread_union.thread_info)
79 #define init_stack (init_thread_union.stack)
81 /* how to get the current stack pointer from C */
82 register unsigned long current_stack_pointer asm("A0StP") __used;
84 /* how to get the thread information struct from C */
85 static inline struct thread_info *current_thread_info(void)
87 return (struct thread_info *)(current_stack_pointer &
91 #define __HAVE_ARCH_KSTACK_END
92 static inline int kstack_end(void *addr)
94 return addr == (void *) (((unsigned long) addr & ~(THREAD_SIZE - 1))
95 + sizeof(struct thread_info));
101 * thread information flags
102 * - these are process state flags that various assembly files may need to
104 * - pending work-to-be-done flags are in LSW
105 * - other flags in MSW
107 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
108 #define TIF_SIGPENDING 1 /* signal pending */
109 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
110 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user
112 #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
113 #define TIF_SECCOMP 5 /* secure computing */
114 #define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
115 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
116 #define TIF_MEMDIE 8 /* is terminating due to OOM killer */
117 #define TIF_SYSCALL_TRACEPOINT 9 /* syscall tracepoint instrumentation */
120 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
121 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
122 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
123 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
124 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
125 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
126 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
127 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
128 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
130 /* work to do in syscall trace */
131 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
132 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
133 _TIF_SYSCALL_TRACEPOINT)
135 /* work to do on any return to u-space */
136 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
137 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
138 _TIF_SINGLESTEP | _TIF_RESTORE_SIGMASK | \
141 /* work to do on interrupt/exception return */
142 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
143 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
145 #endif /* _ASM_THREAD_INFO_H */