Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef __ASM_SH_THREAD_INFO_H
2#define __ASM_SH_THREAD_INFO_H
3
4/* SuperH version
5 * Copyright (C) 2002 Niibe Yutaka
6 *
7 * The copyright of original i386 version is:
8 *
9 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
10 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
11 */
12#ifdef __KERNEL__
13
14#include <asm/page.h>
15
16/*
17 * Page fault error code bits
18 */
19#define FAULT_CODE_WRITE (1 << 0) /* write access */
20#define FAULT_CODE_INITIAL (1 << 1) /* initial page write */
21#define FAULT_CODE_ITLB (1 << 2) /* ITLB miss */
22#define FAULT_CODE_PROT (1 << 3) /* protection fault */
23#define FAULT_CODE_USER (1 << 4) /* user-mode access */
24
25#ifndef __ASSEMBLY__
26#include <asm/processor.h>
27
28struct thread_info {
29 struct task_struct *task; /* main task structure */
30 unsigned long flags; /* low level flags */
31 __u32 status; /* thread synchronous flags */
32 __u32 cpu;
33 int preempt_count; /* 0 => preemptable, <0 => BUG */
34 mm_segment_t addr_limit; /* thread address space */
35 unsigned long previous_sp; /* sp of previous stack in case
36 of nested IRQ stacks */
37 __u8 supervisor_stack[0];
38};
39
40#endif
41
42#if defined(CONFIG_4KSTACKS)
43#define THREAD_SHIFT 12
44#else
45#define THREAD_SHIFT 13
46#endif
47
48#define THREAD_SIZE (1 << THREAD_SHIFT)
49#define STACK_WARN (THREAD_SIZE >> 3)
50
51/*
52 * macros/functions for gaining access to the thread information structure
53 */
54#ifndef __ASSEMBLY__
55#define INIT_THREAD_INFO(tsk) \
56{ \
57 .task = &tsk, \
58 .flags = 0, \
59 .status = 0, \
60 .cpu = 0, \
61 .preempt_count = INIT_PREEMPT_COUNT, \
62 .addr_limit = KERNEL_DS, \
63}
64
65#define init_thread_info (init_thread_union.thread_info)
66#define init_stack (init_thread_union.stack)
67
68/* how to get the current stack pointer from C */
69register unsigned long current_stack_pointer asm("r15") __used;
70
71/* how to get the thread information struct from C */
72static inline struct thread_info *current_thread_info(void)
73{
74 struct thread_info *ti;
75#if defined(CONFIG_SUPERH64)
76 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
77#elif defined(CONFIG_CPU_HAS_SR_RB)
78 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
79#else
80 unsigned long __dummy;
81
82 __asm__ __volatile__ (
83 "mov r15, %0\n\t"
84 "and %1, %0\n\t"
85 : "=&r" (ti), "=r" (__dummy)
86 : "1" (~(THREAD_SIZE - 1))
87 : "memory");
88#endif
89
90 return ti;
91}
92
93#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
94
95extern void arch_task_cache_init(void);
96extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
97extern void arch_release_task_struct(struct task_struct *tsk);
98extern void init_thread_xstate(void);
99
100#endif /* __ASSEMBLY__ */
101
102/*
103 * Thread information flags
104 *
105 * - Limited to 24 bits, upper byte used for fault code encoding.
106 *
107 * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
108 * we blow the tst immediate size constraints and need to fix up
109 * arch/sh/kernel/entry-common.S.
110 */
111#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
112#define TIF_SIGPENDING 1 /* signal pending */
113#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
114#define TIF_SINGLESTEP 4 /* singlestepping active */
115#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
116#define TIF_SECCOMP 6 /* secure computing */
117#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
118#define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
119#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
120#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
121
122#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
123#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
124#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
125#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
126#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
127#define _TIF_SECCOMP (1 << TIF_SECCOMP)
128#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
129#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
130#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
131
132/* work to do in syscall trace */
133#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
134 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
135 _TIF_SYSCALL_TRACEPOINT)
136
137/* work to do on any return to u-space */
138#define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
139 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
140 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \
141 _TIF_SYSCALL_TRACEPOINT)
142
143/* work to do on interrupt/exception return */
144#define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
145 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
146
147/*
148 * Thread-synchronous status.
149 *
150 * This is different from the flags in that nobody else
151 * ever touches our thread-synchronous status, so we don't
152 * have to worry about atomic accesses.
153 */
154#define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
155#define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */
156
157#ifndef __ASSEMBLY__
158
159#define HAVE_SET_RESTORE_SIGMASK 1
160static inline void set_restore_sigmask(void)
161{
162 struct thread_info *ti = current_thread_info();
163 ti->status |= TS_RESTORE_SIGMASK;
164 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
165}
166
167#define TI_FLAG_FAULT_CODE_SHIFT 24
168
169/*
170 * Additional thread flag encoding
171 */
172static inline void set_thread_fault_code(unsigned int val)
173{
174 struct thread_info *ti = current_thread_info();
175 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
176 | (val << TI_FLAG_FAULT_CODE_SHIFT);
177}
178
179static inline unsigned int get_thread_fault_code(void)
180{
181 struct thread_info *ti = current_thread_info();
182 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
183}
184
185static inline void clear_restore_sigmask(void)
186{
187 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
188}
189static inline bool test_restore_sigmask(void)
190{
191 return current_thread_info()->status & TS_RESTORE_SIGMASK;
192}
193static inline bool test_and_clear_restore_sigmask(void)
194{
195 struct thread_info *ti = current_thread_info();
196 if (!(ti->status & TS_RESTORE_SIGMASK))
197 return false;
198 ti->status &= ~TS_RESTORE_SIGMASK;
199 return true;
200}
201
202#endif /* !__ASSEMBLY__ */
203
204#endif /* __KERNEL__ */
205
206#endif /* __ASM_SH_THREAD_INFO_H */