1 /* thread_info.h: PowerPC low-level thread information
2 * adapted from the i386 version by Paul Mackerras
3 *
4 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
6 */
7
8 #ifndef _ASM_POWERPC_THREAD_INFO_H
9 #define _ASM_POWERPC_THREAD_INFO_H
10
11 #ifdef __KERNEL__
12
13 /* We have 8k stacks on ppc32 and 16k on ppc64 */
14
15 #if defined(CONFIG_PPC64)
16 #define THREAD_SHIFT 14
17 #elif defined(CONFIG_PPC_256K_PAGES)
18 #define THREAD_SHIFT 15
19 #else
20 #define THREAD_SHIFT 13
21 #endif
22
23 #define THREAD_SIZE (1 << THREAD_SHIFT)
24
25 #ifdef CONFIG_PPC64
26 #define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(clrrdi dest, sp, THREAD_SHIFT)
27 #else
28 #define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT)
29 #endif
30
31 #ifndef __ASSEMBLY__
32 #include <linux/cache.h>
33 #include <asm/processor.h>
34 #include <asm/page.h>
35 #include <linux/stringify.h>
36
37 /*
38 * low level task data.
39 */
40 struct thread_info {
41 struct task_struct *task; /* main task structure */
42 int cpu; /* cpu we're on */
43 int preempt_count; /* 0 => preemptable,
44 <0 => BUG */
45 unsigned long local_flags; /* private flags for thread */
46
47 /* low level flags - has atomic operations done on it */
48 unsigned long flags ____cacheline_aligned_in_smp;
49 };
50
51 /*
52 * macros/functions for gaining access to the thread information structure
53 */
54 #define INIT_THREAD_INFO(tsk) \
55 { \
56 .task = &tsk, \
57 .cpu = 0, \
58 .preempt_count = INIT_PREEMPT_COUNT, \
59 .flags = 0, \
60 }
61
62 #define init_thread_info (init_thread_union.thread_info)
63 #define init_stack (init_thread_union.stack)
64
65 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
66
67 /* how to get the thread information struct from C */
current_thread_info(void)68 static inline struct thread_info *current_thread_info(void)
69 {
70 unsigned long val;
71
72 asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val));
73
74 return (struct thread_info *)val;
75 }
76
77 #endif /* __ASSEMBLY__ */
78
79 /*
80 * thread information flag bit numbers
81 */
82 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
83 #define TIF_SIGPENDING 1 /* signal pending */
84 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
85 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
86 TIF_NEED_RESCHED */
87 #define TIF_32BIT 4 /* 32 bit binary */
88 #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
89 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
90 #define TIF_SINGLESTEP 8 /* singlestepping active */
91 #define TIF_NOHZ 9 /* in adaptive nohz mode */
92 #define TIF_SECCOMP 10 /* secure computing */
93 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
94 #define TIF_NOERROR 12 /* Force successful syscall return */
95 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
96 #define TIF_UPROBE 14 /* breakpointed or single-stepping */
97 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
98 #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
99 for stack store? */
100 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */
101 #if defined(CONFIG_PPC64)
102 #define TIF_ELF2ABI 18 /* function descriptors must die! */
103 #endif
104
105 /* as above, but as bit values */
106 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
107 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
108 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
109 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
110 #define _TIF_32BIT (1<<TIF_32BIT)
111 #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM)
112 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
113 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
114 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
115 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
116 #define _TIF_NOERROR (1<<TIF_NOERROR)
117 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
118 #define _TIF_UPROBE (1<<TIF_UPROBE)
119 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
120 #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
121 #define _TIF_NOHZ (1<<TIF_NOHZ)
122 #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
123 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
124 _TIF_NOHZ)
125
126 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
127 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
128 _TIF_RESTORE_TM)
129 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
130
131 /* Bits in local_flags */
132 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
133 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */
134 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
135 #define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
136 #define TLF_LAZY_MMU 3 /* tlb_batch is active */
137 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
138
139 #define _TLF_NAPPING (1 << TLF_NAPPING)
140 #define _TLF_SLEEPING (1 << TLF_SLEEPING)
141 #define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK)
142 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
143 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
144
145 #ifndef __ASSEMBLY__
146 #define HAVE_SET_RESTORE_SIGMASK 1
set_restore_sigmask(void)147 static inline void set_restore_sigmask(void)
148 {
149 struct thread_info *ti = current_thread_info();
150 ti->local_flags |= _TLF_RESTORE_SIGMASK;
151 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
152 }
clear_restore_sigmask(void)153 static inline void clear_restore_sigmask(void)
154 {
155 current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
156 }
test_restore_sigmask(void)157 static inline bool test_restore_sigmask(void)
158 {
159 return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK;
160 }
test_and_clear_restore_sigmask(void)161 static inline bool test_and_clear_restore_sigmask(void)
162 {
163 struct thread_info *ti = current_thread_info();
164 if (!(ti->local_flags & _TLF_RESTORE_SIGMASK))
165 return false;
166 ti->local_flags &= ~_TLF_RESTORE_SIGMASK;
167 return true;
168 }
169
test_thread_local_flags(unsigned int flags)170 static inline bool test_thread_local_flags(unsigned int flags)
171 {
172 struct thread_info *ti = current_thread_info();
173 return (ti->local_flags & flags) != 0;
174 }
175
176 #ifdef CONFIG_PPC64
177 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
178 #else
179 #define is_32bit_task() (1)
180 #endif
181
182 #if defined(CONFIG_PPC64)
183 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
184 #else
185 #define is_elf2_task() (0)
186 #endif
187
188 #endif /* !__ASSEMBLY__ */
189
190 #endif /* __KERNEL__ */
191
192 #endif /* _ASM_POWERPC_THREAD_INFO_H */
193