1/* SPDX-License-Identifier: GPL-2.0 */ 2/* thread_info.h: MIPS low-level thread information 3 * 4 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 6 */ 7 8#ifndef _ASM_THREAD_INFO_H 9#define _ASM_THREAD_INFO_H 10 11#ifdef __KERNEL__ 12 13 14#ifndef __ASSEMBLY__ 15 16#include <asm/processor.h> 17 18/* 19 * low level task data that entry.S needs immediate access to 20 * - this struct should fit entirely inside of one cache line 21 * - this struct shares the supervisor stack pages 22 * - if the contents of this structure are changed, the assembly constants 23 * must also be changed 24 */ 25struct thread_info { 26 struct task_struct *task; /* main task structure */ 27 unsigned long flags; /* low level flags */ 28 unsigned long tp_value; /* thread pointer */ 29 __u32 cpu; /* current CPU */ 30 int preempt_count; /* 0 => preemptable, <0 => BUG */ 31 mm_segment_t addr_limit; /* 32 * thread address space limit: 33 * 0x7fffffff for user-thead 34 * 0xffffffff for kernel-thread 35 */ 36 struct pt_regs *regs; 37 long syscall; /* syscall number */ 38}; 39 40/* 41 * macros/functions for gaining access to the thread information structure 42 */ 43#define INIT_THREAD_INFO(tsk) \ 44{ \ 45 .task = &tsk, \ 46 .flags = _TIF_FIXADE, \ 47 .cpu = 0, \ 48 .preempt_count = INIT_PREEMPT_COUNT, \ 49 .addr_limit = KERNEL_DS, \ 50} 51 52/* How to get the thread information struct from C. */ 53register struct thread_info *__current_thread_info __asm__("$28"); 54 55static inline struct thread_info *current_thread_info(void) 56{ 57 return __current_thread_info; 58} 59 60#endif /* !__ASSEMBLY__ */ 61 62/* thread information allocation */ 63#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) 64#define THREAD_SIZE_ORDER (1) 65#endif 66#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) 67#define THREAD_SIZE_ORDER (2) 68#endif 69#ifdef CONFIG_PAGE_SIZE_8KB 70#define THREAD_SIZE_ORDER (1) 71#endif 72#ifdef CONFIG_PAGE_SIZE_16KB 73#define THREAD_SIZE_ORDER (0) 74#endif 75#ifdef CONFIG_PAGE_SIZE_32KB 76#define THREAD_SIZE_ORDER (0) 77#endif 78#ifdef CONFIG_PAGE_SIZE_64KB 79#define THREAD_SIZE_ORDER (0) 80#endif 81 82#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 83#define THREAD_MASK (THREAD_SIZE - 1UL) 84 85#define STACK_WARN (THREAD_SIZE / 8) 86 87/* 88 * thread information flags 89 * - these are process state flags that various assembly files may need to 90 * access 91 * - pending work-to-be-done flags are in LSW 92 * - other flags in MSW 93 */ 94#define TIF_SIGPENDING 1 /* signal pending */ 95#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 96#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ 97#define TIF_SECCOMP 4 /* secure computing */ 98#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ 99#define TIF_UPROBE 6 /* breakpointed or singlestepping */ 100#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 101#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 102#define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 103#define TIF_NOHZ 19 /* in adaptive nohz mode */ 104#define TIF_FIXADE 20 /* Fix address errors in software */ 105#define TIF_LOGADE 21 /* Log address errors to syslog */ 106#define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */ 107#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ 108#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ 109#define TIF_LOAD_WATCH 25 /* If set, load watch registers */ 110#define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */ 111#define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */ 112#define TIF_HYBRID_FPREGS 28 /* 64b FP registers, odd singles in bits 63:32 of even doubles */ 113#define TIF_USEDMSA 29 /* MSA has been used this quantum */ 114#define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */ 115#define TIF_SYSCALL_TRACE 31 /* syscall trace active */ 116 117#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 118#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 119#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 120#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 121#define _TIF_SECCOMP (1<<TIF_SECCOMP) 122#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 123#define _TIF_UPROBE (1<<TIF_UPROBE) 124#define _TIF_USEDFPU (1<<TIF_USEDFPU) 125#define _TIF_NOHZ (1<<TIF_NOHZ) 126#define _TIF_FIXADE (1<<TIF_FIXADE) 127#define _TIF_LOGADE (1<<TIF_LOGADE) 128#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) 129#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) 130#define _TIF_FPUBOUND (1<<TIF_FPUBOUND) 131#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) 132#define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS) 133#define _TIF_HYBRID_FPREGS (1<<TIF_HYBRID_FPREGS) 134#define _TIF_USEDMSA (1<<TIF_USEDMSA) 135#define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE) 136#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 137 138#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ 139 _TIF_SYSCALL_AUDIT | \ 140 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 141 142/* work to do in syscall_trace_leave() */ 143#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ 144 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT) 145 146/* work to do on interrupt/exception return */ 147#define _TIF_WORK_MASK \ 148 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | \ 149 _TIF_UPROBE) 150/* work to do on any return to u-space */ 151#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \ 152 _TIF_WORK_SYSCALL_EXIT | \ 153 _TIF_SYSCALL_TRACEPOINT) 154 155/* 156 * We stash processor id into a COP0 register to retrieve it fast 157 * at kernel exception entry. 158 */ 159#if defined(CONFIG_MIPS_PGD_C0_CONTEXT) 160#define SMP_CPUID_REG 20, 0 /* XCONTEXT */ 161#define ASM_SMP_CPUID_REG $20 162#define SMP_CPUID_PTRSHIFT 48 163#else 164#define SMP_CPUID_REG 4, 0 /* CONTEXT */ 165#define ASM_SMP_CPUID_REG $4 166#define SMP_CPUID_PTRSHIFT 23 167#endif 168 169#ifdef CONFIG_64BIT 170#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3) 171#else 172#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2) 173#endif 174 175#define ASM_CPUID_MFC0 MFC0 176#define UASM_i_CPUID_MFC0 UASM_i_MFC0 177 178#endif /* __KERNEL__ */ 179#endif /* _ASM_THREAD_INFO_H */ 180