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  */
53 struct 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 */
86 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
87 
88 void 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 
clear_thread_local_flags(unsigned int flags)163 static 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 
test_thread_local_flags(unsigned int flags)169 static 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 */
194