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