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_VMAP_STACK) && CONFIG_THREAD_SHIFT < PAGE_SHIFT
18 #define THREAD_SHIFT PAGE_SHIFT
20 #define THREAD_SHIFT CONFIG_THREAD_SHIFT
23 #define THREAD_SIZE (1 << THREAD_SHIFT)
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
30 #ifdef CONFIG_VMAP_STACK
31 #define THREAD_ALIGN_SHIFT (THREAD_SHIFT + 1)
33 #define THREAD_ALIGN_SHIFT THREAD_SHIFT
36 #define THREAD_ALIGN (1 << THREAD_ALIGN_SHIFT)
39 #include <linux/cache.h>
40 #include <asm/processor.h>
41 #include <asm/accounting.h>
43 #define SLB_PRELOAD_NR 16U
45 * low level task data.
48 int preempt_count; /* 0 => preemptable,
50 unsigned long local_flags; /* private flags for thread */
51 #ifdef CONFIG_LIVEPATCH
52 unsigned long *livepatch_sp;
54 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
55 struct cpu_accounting_data accounting;
57 unsigned char slb_preload_nr;
58 unsigned char slb_preload_tail;
59 u32 slb_preload_esid[SLB_PRELOAD_NR];
61 /* low level flags - has atomic operations done on it */
62 unsigned long flags ____cacheline_aligned_in_smp;
66 * macros/functions for gaining access to the thread information structure
68 #define INIT_THREAD_INFO(tsk) \
70 .preempt_count = INIT_PREEMPT_COUNT, \
74 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
76 /* how to get the thread information struct from C */
77 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
79 void arch_setup_new_exec(void);
80 #define arch_setup_new_exec arch_setup_new_exec
82 #endif /* __ASSEMBLY__ */
85 * thread information flag bit numbers
87 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
88 #define TIF_SIGPENDING 1 /* signal pending */
89 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
90 #define TIF_NOTIFY_SIGNAL 3 /* signal notifications exist */
91 #define TIF_SYSCALL_EMU 4 /* syscall emulation active */
92 #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
93 #define TIF_PATCH_PENDING 6 /* pending live patching update */
94 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
95 #define TIF_SINGLESTEP 8 /* singlestepping active */
96 #define TIF_SECCOMP 10 /* secure computing */
97 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
98 #define TIF_NOERROR 12 /* Force successful syscall return */
99 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
100 #define TIF_UPROBE 14 /* breakpointed or single-stepping */
101 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
102 #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
104 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */
105 #if defined(CONFIG_PPC64)
106 #define TIF_ELF2ABI 18 /* function descriptors must die! */
108 #define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */
109 #define TIF_32BIT 20 /* 32 bit binary */
111 /* as above, but as bit values */
112 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
113 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
114 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
115 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
116 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
117 #define _TIF_32BIT (1<<TIF_32BIT)
118 #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM)
119 #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING)
120 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
121 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
122 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
123 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
124 #define _TIF_NOERROR (1<<TIF_NOERROR)
125 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
126 #define _TIF_UPROBE (1<<TIF_UPROBE)
127 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
128 #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
129 #define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU)
130 #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
131 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
134 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
135 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
136 _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \
138 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
140 /* Bits in local_flags */
141 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
142 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */
143 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
144 #define TLF_LAZY_MMU 3 /* tlb_batch is active */
145 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
147 #define _TLF_NAPPING (1 << TLF_NAPPING)
148 #define _TLF_SLEEPING (1 << TLF_SLEEPING)
149 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
150 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
154 static inline void clear_thread_local_flags(unsigned int flags)
156 struct thread_info *ti = current_thread_info();
157 ti->local_flags &= ~flags;
160 static inline bool test_thread_local_flags(unsigned int flags)
162 struct thread_info *ti = current_thread_info();
163 return (ti->local_flags & flags) != 0;
167 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
169 #define is_32bit_task() (IS_ENABLED(CONFIG_PPC32))
172 #if defined(CONFIG_PPC64)
173 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
175 #define is_elf2_task() (0)
178 #endif /* !__ASSEMBLY__ */
180 #endif /* __KERNEL__ */
182 #endif /* _ASM_POWERPC_THREAD_INFO_H */