thread_info.h (3899B)
1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com> 4 * Copyright (C) 2012 Regents of the University of California 5 * Copyright (C) 2017 SiFive 6 */ 7 8#ifndef _ASM_RISCV_THREAD_INFO_H 9#define _ASM_RISCV_THREAD_INFO_H 10 11#include <asm/page.h> 12#include <linux/const.h> 13 14#ifdef CONFIG_KASAN 15#define KASAN_STACK_ORDER 1 16#else 17#define KASAN_STACK_ORDER 0 18#endif 19 20/* thread information allocation */ 21#ifdef CONFIG_64BIT 22#define THREAD_SIZE_ORDER (2 + KASAN_STACK_ORDER) 23#else 24#define THREAD_SIZE_ORDER (1 + KASAN_STACK_ORDER) 25#endif 26#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 27 28/* 29 * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by 30 * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry 31 * assembly. 32 */ 33#ifdef CONFIG_VMAP_STACK 34#define THREAD_ALIGN (2 * THREAD_SIZE) 35#else 36#define THREAD_ALIGN THREAD_SIZE 37#endif 38 39#define THREAD_SHIFT (PAGE_SHIFT + THREAD_SIZE_ORDER) 40#define OVERFLOW_STACK_SIZE SZ_4K 41#define SHADOW_OVERFLOW_STACK_SIZE (1024) 42 43#ifndef __ASSEMBLY__ 44 45#include <asm/processor.h> 46#include <asm/csr.h> 47 48/* 49 * low level task data that entry.S needs immediate access to 50 * - this struct should fit entirely inside of one cache line 51 * - if the members of this struct changes, the assembly constants 52 * in asm-offsets.c must be updated accordingly 53 * - thread_info is included in task_struct at an offset of 0. This means that 54 * tp points to both thread_info and task_struct. 55 */ 56struct thread_info { 57 unsigned long flags; /* low level flags */ 58 int preempt_count; /* 0=>preemptible, <0=>BUG */ 59 /* 60 * These stack pointers are overwritten on every system call or 61 * exception. SP is also saved to the stack it can be recovered when 62 * overwritten. 63 */ 64 long kernel_sp; /* Kernel stack pointer */ 65 long user_sp; /* User stack pointer */ 66 int cpu; 67}; 68 69/* 70 * macros/functions for gaining access to the thread information structure 71 * 72 * preempt_count needs to be 1 initially, until the scheduler is functional. 73 */ 74#define INIT_THREAD_INFO(tsk) \ 75{ \ 76 .flags = 0, \ 77 .preempt_count = INIT_PREEMPT_COUNT, \ 78} 79 80#endif /* !__ASSEMBLY__ */ 81 82/* 83 * thread information flags 84 * - these are process state flags that various assembly files may need to 85 * access 86 * - pending work-to-be-done flags are in lowest half-word 87 * - other flags in upper half-word(s) 88 */ 89#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 90#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 91#define TIF_SIGPENDING 2 /* signal pending */ 92#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 93#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ 94#define TIF_MEMDIE 5 /* is terminating due to OOM killer */ 95#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 96#define TIF_SYSCALL_AUDIT 7 /* syscall auditing */ 97#define TIF_SECCOMP 8 /* syscall secure computing */ 98#define TIF_NOTIFY_SIGNAL 9 /* signal notifications exist */ 99#define TIF_UPROBE 10 /* uprobe breakpoint or singlestep */ 100#define TIF_32BIT 11 /* compat-mode 32bit process */ 101 102#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 103#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 104#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 105#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 106#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 107#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 108#define _TIF_SECCOMP (1 << TIF_SECCOMP) 109#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) 110#define _TIF_UPROBE (1 << TIF_UPROBE) 111 112#define _TIF_WORK_MASK \ 113 (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 114 _TIF_NOTIFY_SIGNAL | _TIF_UPROBE) 115 116#define _TIF_SYSCALL_WORK \ 117 (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT | \ 118 _TIF_SECCOMP) 119 120#endif /* _ASM_RISCV_THREAD_INFO_H */