thread_info.h (6213B)
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 */ 53struct 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 */ 86extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 87 88void 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 163static 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 169static 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 */