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Diffstat (limited to 'arch/riscv/include/asm/thread_info.h')
| -rw-r--r-- | arch/riscv/include/asm/thread_info.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/thread_info.h b/arch/riscv/include/asm/thread_info.h new file mode 100644 index 000000000..f704c8dd5 --- /dev/null +++ b/arch/riscv/include/asm/thread_info.h @@ -0,0 +1,123 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com> + * Copyright (C) 2012 Regents of the University of California + * Copyright (C) 2017 SiFive + */ + +#ifndef _ASM_RISCV_THREAD_INFO_H +#define _ASM_RISCV_THREAD_INFO_H + +#include <asm/page.h> +#include <linux/const.h> + +#ifdef CONFIG_KASAN +#define KASAN_STACK_ORDER 1 +#else +#define KASAN_STACK_ORDER 0 +#endif + +/* thread information allocation */ +#ifdef CONFIG_64BIT +#define THREAD_SIZE_ORDER (2 + KASAN_STACK_ORDER) +#else +#define THREAD_SIZE_ORDER (1 + KASAN_STACK_ORDER) +#endif +#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) + +/* + * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by + * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry + * assembly. + */ +#ifdef CONFIG_VMAP_STACK +#define THREAD_ALIGN (2 * THREAD_SIZE) +#else +#define THREAD_ALIGN THREAD_SIZE +#endif + +#define THREAD_SHIFT (PAGE_SHIFT + THREAD_SIZE_ORDER) +#define OVERFLOW_STACK_SIZE SZ_4K +#define SHADOW_OVERFLOW_STACK_SIZE (1024) + +#ifndef __ASSEMBLY__ + +extern long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE / sizeof(long)]; +extern unsigned long spin_shadow_stack; + +#include <asm/processor.h> +#include <asm/csr.h> + +/* + * low level task data that entry.S needs immediate access to + * - this struct should fit entirely inside of one cache line + * - if the members of this struct changes, the assembly constants + * in asm-offsets.c must be updated accordingly + * - thread_info is included in task_struct at an offset of 0. This means that + * tp points to both thread_info and task_struct. + */ +struct thread_info { + unsigned long flags; /* low level flags */ + int preempt_count; /* 0=>preemptible, <0=>BUG */ + /* + * These stack pointers are overwritten on every system call or + * exception. SP is also saved to the stack it can be recovered when + * overwritten. + */ + long kernel_sp; /* Kernel stack pointer */ + long user_sp; /* User stack pointer */ + int cpu; +}; + +/* + * macros/functions for gaining access to the thread information structure + * + * preempt_count needs to be 1 initially, until the scheduler is functional. + */ +#define INIT_THREAD_INFO(tsk) \ +{ \ + .flags = 0, \ + .preempt_count = INIT_PREEMPT_COUNT, \ +} + +#endif /* !__ASSEMBLY__ */ + +/* + * thread information flags + * - these are process state flags that various assembly files may need to + * access + * - pending work-to-be-done flags are in lowest half-word + * - other flags in upper half-word(s) + */ +#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ +#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ +#define TIF_SIGPENDING 2 /* signal pending */ +#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ +#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ +#define TIF_MEMDIE 5 /* is terminating due to OOM killer */ +#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ +#define TIF_SYSCALL_AUDIT 7 /* syscall auditing */ +#define TIF_SECCOMP 8 /* syscall secure computing */ +#define TIF_NOTIFY_SIGNAL 9 /* signal notifications exist */ +#define TIF_UPROBE 10 /* uprobe breakpoint or singlestep */ +#define TIF_32BIT 11 /* compat-mode 32bit process */ + +#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) +#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) +#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) +#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) +#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) +#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) +#define _TIF_SECCOMP (1 << TIF_SECCOMP) +#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) +#define _TIF_UPROBE (1 << TIF_UPROBE) + +#define _TIF_WORK_MASK \ + (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED | \ + _TIF_NOTIFY_SIGNAL | _TIF_UPROBE) + +#define _TIF_SYSCALL_WORK \ + (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT | \ + _TIF_SECCOMP) + +#endif /* _ASM_RISCV_THREAD_INFO_H */ |