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