124 lines
3.9 KiB
C
124 lines
3.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
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* Copyright (C) 2012 Regents of the University of California
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* Copyright (C) 2017 SiFive
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*/
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#ifndef _ASM_RISCV_THREAD_INFO_H
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#define _ASM_RISCV_THREAD_INFO_H
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#include <asm/page.h>
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#include <linux/const.h>
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#ifdef CONFIG_KASAN
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#define KASAN_STACK_ORDER 1
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#else
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#define KASAN_STACK_ORDER 0
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#endif
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/* thread information allocation */
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#ifdef CONFIG_64BIT
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#define THREAD_SIZE_ORDER (2 + KASAN_STACK_ORDER)
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#else
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#define THREAD_SIZE_ORDER (1 + KASAN_STACK_ORDER)
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#endif
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
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/*
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* By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by
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* checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
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* assembly.
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*/
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#ifdef CONFIG_VMAP_STACK
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#define THREAD_ALIGN (2 * THREAD_SIZE)
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#else
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#define THREAD_ALIGN THREAD_SIZE
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#endif
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#define THREAD_SHIFT (PAGE_SHIFT + THREAD_SIZE_ORDER)
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#define OVERFLOW_STACK_SIZE SZ_4K
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#define SHADOW_OVERFLOW_STACK_SIZE (1024)
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#ifndef __ASSEMBLY__
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extern long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE / sizeof(long)];
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extern unsigned long spin_shadow_stack;
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#include <asm/processor.h>
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#include <asm/csr.h>
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/*
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* low level task data that entry.S needs immediate access to
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* - this struct should fit entirely inside of one cache line
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* - if the members of this struct changes, the assembly constants
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* in asm-offsets.c must be updated accordingly
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* - thread_info is included in task_struct at an offset of 0. This means that
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* tp points to both thread_info and task_struct.
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*/
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struct thread_info {
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unsigned long flags; /* low level flags */
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int preempt_count; /* 0=>preemptible, <0=>BUG */
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/*
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* These stack pointers are overwritten on every system call or
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* exception. SP is also saved to the stack it can be recovered when
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* overwritten.
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*/
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long kernel_sp; /* Kernel stack pointer */
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long user_sp; /* User stack pointer */
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int cpu;
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};
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/*
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* macros/functions for gaining access to the thread information structure
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*
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* preempt_count needs to be 1 initially, until the scheduler is functional.
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*/
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.flags = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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}
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#endif /* !__ASSEMBLY__ */
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/*
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* thread information flags
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* - these are process state flags that various assembly files may need to
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* access
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* - pending work-to-be-done flags are in lowest half-word
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* - other flags in upper half-word(s)
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
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#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
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#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
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#define TIF_SYSCALL_AUDIT 7 /* syscall auditing */
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#define TIF_SECCOMP 8 /* syscall secure computing */
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#define TIF_NOTIFY_SIGNAL 9 /* signal notifications exist */
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#define TIF_UPROBE 10 /* uprobe breakpoint or singlestep */
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#define TIF_32BIT 11 /* compat-mode 32bit process */
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
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#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
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#define _TIF_SECCOMP (1 << TIF_SECCOMP)
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#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
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#define _TIF_UPROBE (1 << TIF_UPROBE)
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#define _TIF_WORK_MASK \
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(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED | \
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_TIF_NOTIFY_SIGNAL | _TIF_UPROBE)
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#define _TIF_SYSCALL_WORK \
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(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT | \
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_TIF_SECCOMP)
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#endif /* _ASM_RISCV_THREAD_INFO_H */
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