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 #ifndef __ASSEMBLY__ 29 30 #include <asm/processor.h> 31 #include <asm/csr.h> 32 33 /* 34 * low level task data that entry.S needs immediate access to 35 * - this struct should fit entirely inside of one cache line 36 * - if the members of this struct changes, the assembly constants 37 * in asm-offsets.c must be updated accordingly 38 * - thread_info is included in task_struct at an offset of 0. This means that 39 * tp points to both thread_info and task_struct. 40 */ 41 struct thread_info { 42 unsigned long flags; /* low level flags */ 43 int preempt_count; /* 0=>preemptible, <0=>BUG */ 44 /* 45 * These stack pointers are overwritten on every system call or 46 * exception. SP is also saved to the stack it can be recovered when 47 * overwritten. 48 */ 49 long kernel_sp; /* Kernel stack pointer */ 50 long user_sp; /* User stack pointer */ 51 int cpu; 52 }; 53 54 /* 55 * macros/functions for gaining access to the thread information structure 56 * 57 * preempt_count needs to be 1 initially, until the scheduler is functional. 58 */ 59 #define INIT_THREAD_INFO(tsk) \ 60 { \ 61 .flags = 0, \ 62 .preempt_count = INIT_PREEMPT_COUNT, \ 63 } 64 65 #endif /* !__ASSEMBLY__ */ 66 67 /* 68 * thread information flags 69 * - these are process state flags that various assembly files may need to 70 * access 71 * - pending work-to-be-done flags are in lowest half-word 72 * - other flags in upper half-word(s) 73 */ 74 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 75 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 76 #define TIF_SIGPENDING 2 /* signal pending */ 77 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 78 #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ 79 #define TIF_MEMDIE 5 /* is terminating due to OOM killer */ 80 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 81 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing */ 82 #define TIF_SECCOMP 8 /* syscall secure computing */ 83 #define TIF_NOTIFY_SIGNAL 9 /* signal notifications exist */ 84 85 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 86 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 87 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 88 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 89 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 90 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 91 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 92 #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) 93 94 #define _TIF_WORK_MASK \ 95 (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 96 _TIF_NOTIFY_SIGNAL) 97 98 #define _TIF_SYSCALL_WORK \ 99 (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT | \ 100 _TIF_SECCOMP) 101 102 #endif /* _ASM_RISCV_THREAD_INFO_H */ 103