Linux kernel mirror (for testing)
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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#ifdef __KERNEL__
13
14#define THREAD_SHIFT CONFIG_THREAD_SHIFT
15
16#define THREAD_SIZE (1 << THREAD_SHIFT)
17
18#ifdef CONFIG_PPC64
19#define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(clrrdi dest, sp, THREAD_SHIFT)
20#else
21#define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT)
22#endif
23
24#ifndef __ASSEMBLY__
25#include <linux/cache.h>
26#include <asm/processor.h>
27#include <asm/page.h>
28#include <linux/stringify.h>
29#include <asm/accounting.h>
30
31/*
32 * low level task data.
33 */
34struct thread_info {
35 struct task_struct *task; /* main task structure */
36 int cpu; /* cpu we're on */
37 int preempt_count; /* 0 => preemptable,
38 <0 => BUG */
39 unsigned long local_flags; /* private flags for thread */
40#ifdef CONFIG_LIVEPATCH
41 unsigned long *livepatch_sp;
42#endif
43#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
44 struct cpu_accounting_data accounting;
45#endif
46 /* low level flags - has atomic operations done on it */
47 unsigned long flags ____cacheline_aligned_in_smp;
48};
49
50/*
51 * macros/functions for gaining access to the thread information structure
52 */
53#define INIT_THREAD_INFO(tsk) \
54{ \
55 .task = &tsk, \
56 .cpu = 0, \
57 .preempt_count = INIT_PREEMPT_COUNT, \
58 .flags = 0, \
59}
60
61#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
62
63/* how to get the thread information struct from C */
64static inline struct thread_info *current_thread_info(void)
65{
66 unsigned long val;
67
68 asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val));
69
70 return (struct thread_info *)val;
71}
72
73extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
74#endif /* __ASSEMBLY__ */
75
76/*
77 * thread information flag bit numbers
78 */
79#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
80#define TIF_SIGPENDING 1 /* signal pending */
81#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
82#define TIF_FSCHECK 3 /* Check FS is USER_DS on return */
83#define TIF_32BIT 4 /* 32 bit binary */
84#define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
85#define TIF_PATCH_PENDING 6 /* pending live patching update */
86#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
87#define TIF_SINGLESTEP 8 /* singlestepping active */
88#define TIF_NOHZ 9 /* in adaptive nohz mode */
89#define TIF_SECCOMP 10 /* secure computing */
90#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
91#define TIF_NOERROR 12 /* Force successful syscall return */
92#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
93#define TIF_UPROBE 14 /* breakpointed or single-stepping */
94#define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
95#define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
96 for stack store? */
97#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
98#if defined(CONFIG_PPC64)
99#define TIF_ELF2ABI 18 /* function descriptors must die! */
100#endif
101#define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */
102
103/* as above, but as bit values */
104#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
105#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
106#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
107#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
108#define _TIF_32BIT (1<<TIF_32BIT)
109#define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM)
110#define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING)
111#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
112#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
113#define _TIF_SECCOMP (1<<TIF_SECCOMP)
114#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
115#define _TIF_NOERROR (1<<TIF_NOERROR)
116#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
117#define _TIF_UPROBE (1<<TIF_UPROBE)
118#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
119#define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
120#define _TIF_NOHZ (1<<TIF_NOHZ)
121#define _TIF_FSCHECK (1<<TIF_FSCHECK)
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 | _TIF_PATCH_PENDING | \
129 _TIF_FSCHECK)
130#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
131
132/* Bits in local_flags */
133/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
134#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
135#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
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_LAZY_MMU (1 << TLF_LAZY_MMU)
142#define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
143
144#ifndef __ASSEMBLY__
145
146static inline bool test_thread_local_flags(unsigned int flags)
147{
148 struct thread_info *ti = current_thread_info();
149 return (ti->local_flags & flags) != 0;
150}
151
152#ifdef CONFIG_PPC64
153#define is_32bit_task() (test_thread_flag(TIF_32BIT))
154#else
155#define is_32bit_task() (1)
156#endif
157
158#if defined(CONFIG_PPC64)
159#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
160#else
161#define is_elf2_task() (0)
162#endif
163
164#endif /* !__ASSEMBLY__ */
165
166#endif /* __KERNEL__ */
167
168#endif /* _ASM_POWERPC_THREAD_INFO_H */