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
5 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
6 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
9 #ifndef _ASM_POWERPC_THREAD_INFO_H
10 #define _ASM_POWERPC_THREAD_INFO_H
12 #include <asm/asm-const.h>
17 #if defined(CONFIG_KASAN) && CONFIG_THREAD_SHIFT < 15
18 #define MIN_THREAD_SHIFT (CONFIG_THREAD_SHIFT + 1)
20 #define MIN_THREAD_SHIFT CONFIG_THREAD_SHIFT
23 #if defined(CONFIG_VMAP_STACK) && MIN_THREAD_SHIFT < PAGE_SHIFT
24 #define THREAD_SHIFT PAGE_SHIFT
26 #define THREAD_SHIFT MIN_THREAD_SHIFT
29 #define THREAD_SIZE (1 << THREAD_SHIFT)
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
36 #ifdef CONFIG_VMAP_STACK
37 #define THREAD_ALIGN_SHIFT (THREAD_SHIFT + 1)
39 #define THREAD_ALIGN_SHIFT THREAD_SHIFT
42 #define THREAD_ALIGN (1 << THREAD_ALIGN_SHIFT)
45 #include <linux/cache.h>
46 #include <asm/processor.h>
47 #include <asm/accounting.h>
49 #define SLB_PRELOAD_NR 16U
51 * low level task data.
54 int preempt_count; /* 0 => preemptable,
59 unsigned long local_flags; /* private flags for thread */
60 #ifdef CONFIG_LIVEPATCH_64
61 unsigned long *livepatch_sp;
63 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
64 struct cpu_accounting_data accounting;
66 unsigned char slb_preload_nr;
67 unsigned char slb_preload_tail;
68 u32 slb_preload_esid[SLB_PRELOAD_NR];
70 /* low level flags - has atomic operations done on it */
71 unsigned long flags ____cacheline_aligned_in_smp;
75 * macros/functions for gaining access to the thread information structure
77 #define INIT_THREAD_INFO(tsk) \
79 .preempt_count = INIT_PREEMPT_COUNT, \
83 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
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);
88 void arch_setup_new_exec(void);
89 #define arch_setup_new_exec arch_setup_new_exec
91 #endif /* __ASSEMBLY__ */
94 * thread information flag bit numbers
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
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! */
117 #define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */
118 #define TIF_32BIT 20 /* 32 bit binary */
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 | \
143 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
144 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
145 _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \
147 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
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? */
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)
163 static inline void clear_thread_local_flags(unsigned int flags)
165 struct thread_info *ti = current_thread_info();
166 ti->local_flags &= ~flags;
169 static inline bool test_thread_local_flags(unsigned int flags)
171 struct thread_info *ti = current_thread_info();
172 return (ti->local_flags & flags) != 0;
176 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
177 #define is_tsk_32bit_task(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT))
179 #define is_32bit_task() (IS_ENABLED(CONFIG_PPC32))
180 #define is_tsk_32bit_task(tsk) (IS_ENABLED(CONFIG_PPC32))
183 #if defined(CONFIG_PPC64)
184 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
186 #define is_elf2_task() (0)
189 #endif /* !__ASSEMBLY__ */
191 #endif /* __KERNEL__ */
193 #endif /* _ASM_POWERPC_THREAD_INFO_H */