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/page.h>
48#include <asm/accounting.h>
49
50#define SLB_PRELOAD_NR	16U
51/*
52 * low level task data.
53 */
54struct thread_info {
55	int		preempt_count;		/* 0 => preemptable,
56						   <0 => BUG */
57	unsigned long	local_flags;		/* private flags for thread */
58#ifdef CONFIG_LIVEPATCH
59	unsigned long *livepatch_sp;
60#endif
61#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
62	struct cpu_accounting_data accounting;
63#endif
64	unsigned char slb_preload_nr;
65	unsigned char slb_preload_tail;
66	u32 slb_preload_esid[SLB_PRELOAD_NR];
67
68	/* low level flags - has atomic operations done on it */
69	unsigned long	flags ____cacheline_aligned_in_smp;
70};
71
72/*
73 * macros/functions for gaining access to the thread information structure
74 */
75#define INIT_THREAD_INFO(tsk)			\
76{						\
77	.preempt_count = INIT_PREEMPT_COUNT,	\
78	.flags =	0,			\
79}
80
81#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)
82
83/* how to get the thread information struct from C */
84extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
85
86#ifdef CONFIG_PPC_BOOK3S_64
87void arch_setup_new_exec(void);
88#define arch_setup_new_exec arch_setup_new_exec
89#endif
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_NOHZ		9	/* in adaptive nohz mode */
106#define TIF_SECCOMP		10	/* secure computing */
107#define TIF_RESTOREALL		11	/* Restore all regs (implies NOERROR) */
108#define TIF_NOERROR		12	/* Force successful syscall return */
109#define TIF_NOTIFY_RESUME	13	/* callback before returning to user */
110#define TIF_UPROBE		14	/* breakpointed or single-stepping */
111#define TIF_SYSCALL_TRACEPOINT	15	/* syscall tracepoint instrumentation */
112#define TIF_EMULATE_STACK_STORE	16	/* Is an instruction emulation
113						for stack store? */
114#define TIF_MEMDIE		17	/* is terminating due to OOM killer */
115#if defined(CONFIG_PPC64)
116#define TIF_ELF2ABI		18	/* function descriptors must die! */
117#endif
118#define TIF_POLLING_NRFLAG	19	/* true if poll_idle() is polling TIF_NEED_RESCHED */
119#define TIF_32BIT		20	/* 32 bit binary */
120
121/* as above, but as bit values */
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_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
126#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
127#define _TIF_32BIT		(1<<TIF_32BIT)
128#define _TIF_RESTORE_TM		(1<<TIF_RESTORE_TM)
129#define _TIF_PATCH_PENDING	(1<<TIF_PATCH_PENDING)
130#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
131#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
132#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
133#define _TIF_RESTOREALL		(1<<TIF_RESTOREALL)
134#define _TIF_NOERROR		(1<<TIF_NOERROR)
135#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
136#define _TIF_UPROBE		(1<<TIF_UPROBE)
137#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)
138#define _TIF_EMULATE_STACK_STORE	(1<<TIF_EMULATE_STACK_STORE)
139#define _TIF_NOHZ		(1<<TIF_NOHZ)
140#define _TIF_SYSCALL_EMU	(1<<TIF_SYSCALL_EMU)
141#define _TIF_SYSCALL_DOTRACE	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
142				 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
143				 _TIF_NOHZ | _TIF_SYSCALL_EMU)
144
145#define _TIF_USER_WORK_MASK	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
146				 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
147				 _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \
148				 _TIF_NOTIFY_SIGNAL)
149#define _TIF_PERSYSCALL_MASK	(_TIF_RESTOREALL|_TIF_NOERROR)
150
151/* Bits in local_flags */
152/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
153#define TLF_NAPPING		0	/* idle thread enabled NAP mode */
154#define TLF_SLEEPING		1	/* suspend code enabled SLEEP mode */
155#define TLF_LAZY_MMU		3	/* tlb_batch is active */
156#define TLF_RUNLATCH		4	/* Is the runlatch enabled? */
157
158#define _TLF_NAPPING		(1 << TLF_NAPPING)
159#define _TLF_SLEEPING		(1 << TLF_SLEEPING)
160#define _TLF_LAZY_MMU		(1 << TLF_LAZY_MMU)
161#define _TLF_RUNLATCH		(1 << TLF_RUNLATCH)
162
163#ifndef __ASSEMBLY__
164
165static inline bool test_thread_local_flags(unsigned int flags)
166{
167	struct thread_info *ti = current_thread_info();
168	return (ti->local_flags & flags) != 0;
169}
170
171#ifdef CONFIG_COMPAT
172#define is_32bit_task()	(test_thread_flag(TIF_32BIT))
173#else
174#define is_32bit_task()	(IS_ENABLED(CONFIG_PPC32))
175#endif
176
177#if defined(CONFIG_PPC64)
178#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
179#else
180#define is_elf2_task() (0)
181#endif
182
183#endif	/* !__ASSEMBLY__ */
184
185#endif /* __KERNEL__ */
186
187#endif /* _ASM_POWERPC_THREAD_INFO_H */
188