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 */ 47struct thread_info { 48 int preempt_count; /* 0 => preemptable, 49 <0 => BUG */ 50 unsigned long local_flags; /* private flags for thread */ 51#ifdef CONFIG_LIVEPATCH 52 unsigned long *livepatch_sp; 53#endif 54#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32) 55 struct cpu_accounting_data accounting; 56#endif 57 unsigned char slb_preload_nr; 58 unsigned char slb_preload_tail; 59 u32 slb_preload_esid[SLB_PRELOAD_NR]; 60 61 /* low level flags - has atomic operations done on it */ 62 unsigned long flags ____cacheline_aligned_in_smp; 63}; 64 65/* 66 * macros/functions for gaining access to the thread information structure 67 */ 68#define INIT_THREAD_INFO(tsk) \ 69{ \ 70 .preempt_count = INIT_PREEMPT_COUNT, \ 71 .flags = 0, \ 72} 73 74#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 75 76/* how to get the thread information struct from C */ 77extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 78 79void arch_setup_new_exec(void); 80#define arch_setup_new_exec arch_setup_new_exec 81 82#endif /* __ASSEMBLY__ */ 83 84/* 85 * thread information flag bit numbers 86 */ 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 103 for stack store? */ 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! */ 107#endif 108#define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 109#define TIF_32BIT 20 /* 32 bit binary */ 110 111/* 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 | \ 132 _TIF_SYSCALL_EMU) 133 134#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 135 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ 136 _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \ 137 _TIF_NOTIFY_SIGNAL) 138#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 139 140/* 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? */ 146 147#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) 151 152#ifndef __ASSEMBLY__ 153 154static inline void clear_thread_local_flags(unsigned int flags) 155{ 156 struct thread_info *ti = current_thread_info(); 157 ti->local_flags &= ~flags; 158} 159 160static inline bool test_thread_local_flags(unsigned int flags) 161{ 162 struct thread_info *ti = current_thread_info(); 163 return (ti->local_flags & flags) != 0; 164} 165 166#ifdef CONFIG_COMPAT 167#define is_32bit_task() (test_thread_flag(TIF_32BIT)) 168#else 169#define is_32bit_task() (IS_ENABLED(CONFIG_PPC32)) 170#endif 171 172#if defined(CONFIG_PPC64) 173#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) 174#else 175#define is_elf2_task() (0) 176#endif 177 178#endif /* !__ASSEMBLY__ */ 179 180#endif /* __KERNEL__ */ 181 182#endif /* _ASM_POWERPC_THREAD_INFO_H */ 183