1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* thread_info.h: PowerPC low-level thread information
3 * adapted from the i386 version by Paul Mackerras
4 *
5 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
6 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
7 */
8
9 #ifndef _ASM_POWERPC_THREAD_INFO_H
10 #define _ASM_POWERPC_THREAD_INFO_H
11
12 #include <asm/asm-const.h>
13
14 #ifdef __KERNEL__
15
16 #define THREAD_SHIFT CONFIG_THREAD_SHIFT
17
18 #define THREAD_SIZE (1 << THREAD_SHIFT)
19
20 #ifdef CONFIG_PPC64
21 #define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(clrrdi dest, sp, THREAD_SHIFT)
22 #else
23 #define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT)
24 #endif
25
26 #ifndef __ASSEMBLY__
27 #include <linux/cache.h>
28 #include <asm/processor.h>
29 #include <asm/page.h>
30 #include <asm/accounting.h>
31
32 /*
33 * low level task data.
34 */
35 struct thread_info {
36 struct task_struct *task; /* main task structure */
37 int cpu; /* cpu we're on */
38 int preempt_count; /* 0 => preemptable,
39 <0 => BUG */
40 unsigned long local_flags; /* private flags for thread */
41 #ifdef CONFIG_LIVEPATCH
42 unsigned long *livepatch_sp;
43 #endif
44 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
45 struct cpu_accounting_data accounting;
46 #endif
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 THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
63
64 /* how to get the thread information struct from C */
current_thread_info(void)65 static inline struct thread_info *current_thread_info(void)
66 {
67 unsigned long val;
68
69 asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val));
70
71 return (struct thread_info *)val;
72 }
73
74 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
75 #endif /* __ASSEMBLY__ */
76
77 /*
78 * thread information flag bit numbers
79 */
80 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
81 #define TIF_SIGPENDING 1 /* signal pending */
82 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
83 #define TIF_FSCHECK 3 /* Check FS is USER_DS on return */
84 #define TIF_32BIT 4 /* 32 bit binary */
85 #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
86 #define TIF_PATCH_PENDING 6 /* pending live patching update */
87 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
88 #define TIF_SINGLESTEP 8 /* singlestepping active */
89 #define TIF_NOHZ 9 /* in adaptive nohz mode */
90 #define TIF_SECCOMP 10 /* secure computing */
91 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
92 #define TIF_NOERROR 12 /* Force successful syscall return */
93 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
94 #define TIF_UPROBE 14 /* breakpointed or single-stepping */
95 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
96 #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
97 for stack store? */
98 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */
99 #if defined(CONFIG_PPC64)
100 #define TIF_ELF2ABI 18 /* function descriptors must die! */
101 #endif
102 #define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */
103
104 /* as above, but as bit values */
105 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
106 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
107 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
108 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
109 #define _TIF_32BIT (1<<TIF_32BIT)
110 #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM)
111 #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING)
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_FSCHECK (1<<TIF_FSCHECK)
123 #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
124 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
125 _TIF_NOHZ)
126
127 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
128 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
129 _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \
130 _TIF_FSCHECK)
131 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
132
133 /* Bits in local_flags */
134 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
135 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */
136 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
137 #define TLF_LAZY_MMU 3 /* tlb_batch is active */
138 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
139
140 #define _TLF_NAPPING (1 << TLF_NAPPING)
141 #define _TLF_SLEEPING (1 << TLF_SLEEPING)
142 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
143 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
144
145 #ifndef __ASSEMBLY__
146
test_thread_local_flags(unsigned int flags)147 static inline bool test_thread_local_flags(unsigned int flags)
148 {
149 struct thread_info *ti = current_thread_info();
150 return (ti->local_flags & flags) != 0;
151 }
152
153 #ifdef CONFIG_PPC64
154 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
155 #else
156 #define is_32bit_task() (1)
157 #endif
158
159 #if defined(CONFIG_PPC64)
160 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
161 #else
162 #define is_elf2_task() (0)
163 #endif
164
165 #endif /* !__ASSEMBLY__ */
166
167 #endif /* __KERNEL__ */
168
169 #endif /* _ASM_POWERPC_THREAD_INFO_H */
170
