1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* thread_info.h: Meta low-level thread information
4 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
7 * Meta port by Imagination Technologies
10 #ifndef _ASM_THREAD_INFO_H
11 #define _ASM_THREAD_INFO_H
13 #include <linux/compiler.h>
17 #include <asm/processor.h>
21 * low level task data that entry.S needs immediate access to
22 * - this struct should fit entirely inside of one cache line
23 * - this struct shares the supervisor stack pages
24 * - if the contents of this structure are changed, the assembly constants must
29 /* This must be 8 byte aligned so we can ensure stack alignment. */
31 struct task_struct *task; /* main task structure */
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) \
73 .preempt_count = INIT_PREEMPT_COUNT, \
74 .addr_limit = KERNEL_DS, \
77 /* how to get the current stack pointer from C */
78 register unsigned long current_stack_pointer asm("A0StP") __used;
80 /* how to get the thread information struct from C */
81 static inline struct thread_info *current_thread_info(void)
83 return (struct thread_info *)(current_stack_pointer &
87 #define __HAVE_ARCH_KSTACK_END
88 static inline int kstack_end(void *addr)
90 return addr == (void *) (((unsigned long) addr & ~(THREAD_SIZE - 1))
91 + sizeof(struct thread_info));
97 * thread information flags
98 * - these are process state flags that various assembly files may need to
100 * - pending work-to-be-done flags are in LSW
101 * - other flags in MSW
103 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
104 #define TIF_SIGPENDING 1 /* signal pending */
105 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
106 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user
108 #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
109 #define TIF_SECCOMP 5 /* secure computing */
110 #define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
111 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
112 #define TIF_MEMDIE 8 /* is terminating due to OOM killer */
113 #define TIF_SYSCALL_TRACEPOINT 9 /* syscall tracepoint instrumentation */
116 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
117 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
118 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
119 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
120 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
121 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
122 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
123 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
124 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
126 /* work to do in syscall trace */
127 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
128 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
129 _TIF_SYSCALL_TRACEPOINT)
131 /* work to do on any return to u-space */
132 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
133 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
134 _TIF_SINGLESTEP | _TIF_RESTORE_SIGMASK | \
137 /* work to do on interrupt/exception return */
138 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
139 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
141 #endif /* _ASM_THREAD_INFO_H */