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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#include <asm/asm-const.h>
13#include <asm/page.h>
14
15#ifdef __KERNEL__
16
17#ifdef CONFIG_KASAN
18#define MIN_THREAD_SHIFT (CONFIG_THREAD_SHIFT + 1)
19#else
20#define MIN_THREAD_SHIFT CONFIG_THREAD_SHIFT
21#endif
22
23#if defined(CONFIG_VMAP_STACK) && MIN_THREAD_SHIFT < PAGE_SHIFT
24#define THREAD_SHIFT PAGE_SHIFT
25#else
26#define THREAD_SHIFT MIN_THREAD_SHIFT
27#endif
28
29#define THREAD_SIZE (1 << THREAD_SHIFT)
30
31/*
32 * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by
33 * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
34 * assembly.
35 */
36#ifdef CONFIG_VMAP_STACK
37#define THREAD_ALIGN_SHIFT (THREAD_SHIFT + 1)
38#else
39#define THREAD_ALIGN_SHIFT THREAD_SHIFT
40#endif
41
42#define THREAD_ALIGN (1 << THREAD_ALIGN_SHIFT)
43
44#ifndef __ASSEMBLY__
45#include <linux/cache.h>
46#include <asm/processor.h>
47#include <asm/accounting.h>
48
49#define SLB_PRELOAD_NR 16U
50/*
51 * low level task data.
52 */
53struct thread_info {
54 int preempt_count; /* 0 => preemptable,
55 <0 => BUG */
56#ifdef CONFIG_SMP
57 unsigned int cpu;
58#endif
59 unsigned long local_flags; /* private flags for thread */
60#ifdef CONFIG_LIVEPATCH_64
61 unsigned long *livepatch_sp;
62#endif
63#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
64 struct cpu_accounting_data accounting;
65#endif
66 unsigned char slb_preload_nr;
67 unsigned char slb_preload_tail;
68 u32 slb_preload_esid[SLB_PRELOAD_NR];
69
70 /* low level flags - has atomic operations done on it */
71 unsigned long flags ____cacheline_aligned_in_smp;
72};
73
74/*
75 * macros/functions for gaining access to the thread information structure
76 */
77#define INIT_THREAD_INFO(tsk) \
78{ \
79 .preempt_count = INIT_PREEMPT_COUNT, \
80 .flags = 0, \
81}
82
83#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
84
85/* how to get the thread information struct from C */
86extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
87
88void arch_setup_new_exec(void);
89#define arch_setup_new_exec arch_setup_new_exec
90
91#endif /* __ASSEMBLY__ */
92
93/*
94 * thread information flag bit numbers
95 */
96#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
97#define TIF_SIGPENDING 1 /* signal pending */
98#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
99#define TIF_NOTIFY_SIGNAL 3 /* signal notifications exist */
100#define TIF_SYSCALL_EMU 4 /* syscall emulation active */
101#define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
102#define TIF_PATCH_PENDING 6 /* pending live patching update */
103#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
104#define TIF_SINGLESTEP 8 /* singlestepping active */
105#define TIF_SECCOMP 10 /* secure computing */
106#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
107#define TIF_NOERROR 12 /* Force successful syscall return */
108#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
109#define TIF_UPROBE 14 /* breakpointed or single-stepping */
110#define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
111#define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
112 for stack store? */
113#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
114#if defined(CONFIG_PPC64)
115#define TIF_ELF2ABI 18 /* function descriptors must die! */
116#endif
117#define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */
118#define TIF_32BIT 20 /* 32 bit binary */
119
120/* as above, but as bit values */
121#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
122#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
123#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
124#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
125#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
126#define _TIF_32BIT (1<<TIF_32BIT)
127#define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM)
128#define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING)
129#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
130#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
131#define _TIF_SECCOMP (1<<TIF_SECCOMP)
132#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
133#define _TIF_NOERROR (1<<TIF_NOERROR)
134#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
135#define _TIF_UPROBE (1<<TIF_UPROBE)
136#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
137#define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
138#define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU)
139#define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
140 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
141 _TIF_SYSCALL_EMU)
142
143#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
144 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
145 _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \
146 _TIF_NOTIFY_SIGNAL)
147#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
148
149/* Bits in local_flags */
150/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
151#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
152#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
153#define TLF_LAZY_MMU 3 /* tlb_batch is active */
154#define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
155
156#define _TLF_NAPPING (1 << TLF_NAPPING)
157#define _TLF_SLEEPING (1 << TLF_SLEEPING)
158#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
159#define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
160
161#ifndef __ASSEMBLY__
162
163static inline void clear_thread_local_flags(unsigned int flags)
164{
165 struct thread_info *ti = current_thread_info();
166 ti->local_flags &= ~flags;
167}
168
169static inline bool test_thread_local_flags(unsigned int flags)
170{
171 struct thread_info *ti = current_thread_info();
172 return (ti->local_flags & flags) != 0;
173}
174
175#ifdef CONFIG_COMPAT
176#define is_32bit_task() (test_thread_flag(TIF_32BIT))
177#define is_tsk_32bit_task(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT))
178#else
179#define is_32bit_task() (IS_ENABLED(CONFIG_PPC32))
180#define is_tsk_32bit_task(tsk) (IS_ENABLED(CONFIG_PPC32))
181#endif
182
183#if defined(CONFIG_PPC64)
184#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
185#else
186#define is_elf2_task() (0)
187#endif
188
189#endif /* !__ASSEMBLY__ */
190
191#endif /* __KERNEL__ */
192
193#endif /* _ASM_POWERPC_THREAD_INFO_H */