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173 lines
5.2 KiB
173 lines
5.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_SH_THREAD_INFO_H |
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#define __ASM_SH_THREAD_INFO_H |
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/* SuperH version |
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* Copyright (C) 2002 Niibe Yutaka |
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* |
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* The copyright of original i386 version is: |
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* |
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* Copyright (C) 2002 David Howells ([email protected]) |
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller |
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*/ |
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#include <asm/page.h> |
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/* |
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* Page fault error code bits |
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*/ |
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#define FAULT_CODE_WRITE (1 << 0) /* write access */ |
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#define FAULT_CODE_INITIAL (1 << 1) /* initial page write */ |
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#define FAULT_CODE_ITLB (1 << 2) /* ITLB miss */ |
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#define FAULT_CODE_PROT (1 << 3) /* protection fault */ |
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#define FAULT_CODE_USER (1 << 4) /* user-mode access */ |
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#ifndef __ASSEMBLY__ |
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#include <asm/processor.h> |
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struct thread_info { |
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struct task_struct *task; /* main task structure */ |
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unsigned long flags; /* low level flags */ |
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__u32 status; /* thread synchronous flags */ |
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__u32 cpu; |
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int preempt_count; /* 0 => preemptable, <0 => BUG */ |
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mm_segment_t addr_limit; /* thread address space */ |
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unsigned long previous_sp; /* sp of previous stack in case |
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of nested IRQ stacks */ |
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__u8 supervisor_stack[0]; |
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}; |
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#endif |
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#if defined(CONFIG_4KSTACKS) |
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#define THREAD_SHIFT 12 |
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#else |
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#define THREAD_SHIFT 13 |
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#endif |
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#define THREAD_SIZE (1 << THREAD_SHIFT) |
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#define STACK_WARN (THREAD_SIZE >> 3) |
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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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#ifndef __ASSEMBLY__ |
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#define INIT_THREAD_INFO(tsk) \ |
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{ \ |
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.task = &tsk, \ |
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.flags = 0, \ |
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.status = 0, \ |
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.cpu = 0, \ |
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.preempt_count = INIT_PREEMPT_COUNT, \ |
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.addr_limit = KERNEL_DS, \ |
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} |
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/* how to get the current stack pointer from C */ |
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register unsigned long current_stack_pointer asm("r15") __used; |
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/* how to get the thread information struct from C */ |
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static inline struct thread_info *current_thread_info(void) |
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{ |
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struct thread_info *ti; |
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#if defined(CONFIG_CPU_HAS_SR_RB) |
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__asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); |
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#else |
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unsigned long __dummy; |
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__asm__ __volatile__ ( |
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"mov r15, %0\n\t" |
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"and %1, %0\n\t" |
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: "=&r" (ti), "=r" (__dummy) |
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: "1" (~(THREAD_SIZE - 1)) |
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: "memory"); |
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#endif |
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return ti; |
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} |
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#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) |
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extern void arch_task_cache_init(void); |
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extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); |
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extern void arch_release_task_struct(struct task_struct *tsk); |
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extern void init_thread_xstate(void); |
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#endif /* __ASSEMBLY__ */ |
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/* |
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* Thread information flags |
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* |
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* - Limited to 24 bits, upper byte used for fault code encoding. |
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* |
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* - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or |
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* we blow the tst immediate size constraints and need to fix up |
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* arch/sh/kernel/entry-common.S. |
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*/ |
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ |
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#define TIF_SIGPENDING 1 /* signal pending */ |
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#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ |
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#define TIF_NOTIFY_SIGNAL 3 /* signal notifications exist */ |
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#define TIF_SINGLESTEP 4 /* singlestepping active */ |
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#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ |
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#define TIF_SECCOMP 6 /* secure computing */ |
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#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ |
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#define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ |
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#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ |
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#define TIF_MEMDIE 18 /* is terminating due to OOM killer */ |
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) |
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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_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) |
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#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) |
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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_RESUME (1 << TIF_NOTIFY_RESUME) |
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#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) |
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#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) |
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/* work to do in syscall trace */ |
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#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ |
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_TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
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_TIF_SYSCALL_TRACEPOINT) |
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/* work to do on any return to u-space */ |
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#define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ |
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_TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ |
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_TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \ |
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_TIF_SYSCALL_TRACEPOINT | _TIF_NOTIFY_SIGNAL) |
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/* work to do on interrupt/exception return */ |
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#define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ |
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_TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)) |
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/* |
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* Thread-synchronous status. |
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* |
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* This is different from the flags in that nobody else |
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* ever touches our thread-synchronous status, so we don't |
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* have to worry about atomic accesses. |
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*/ |
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#define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */ |
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#ifndef __ASSEMBLY__ |
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#define TI_FLAG_FAULT_CODE_SHIFT 24 |
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/* |
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* Additional thread flag encoding |
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*/ |
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static inline void set_thread_fault_code(unsigned int val) |
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{ |
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struct thread_info *ti = current_thread_info(); |
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ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT))) |
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| (val << TI_FLAG_FAULT_CODE_SHIFT); |
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} |
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static inline unsigned int get_thread_fault_code(void) |
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{ |
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struct thread_info *ti = current_thread_info(); |
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return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT; |
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} |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* __ASM_SH_THREAD_INFO_H */
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