Release 4.14 arch/metag/include/asm/thread_info.h

/* SPDX-License-Identifier: GPL-2.0 */
/* thread_info.h: Meta low-level thread information
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 *
 * Meta port by Imagination Technologies
 */

#ifndef _ASM_THREAD_INFO_H

#define _ASM_THREAD_INFO_H

#include <linux/compiler.h>
#include <asm/page.h>

#ifndef __ASSEMBLY__
#include <asm/processor.h>
#endif

/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed, the assembly constants must
 *   also be changed
 */
#ifndef __ASSEMBLY__

/* This must be 8 byte aligned so we can ensure stack alignment. */

struct thread_info {
	
struct task_struct *task;	/* main task structure */
	
unsigned long flags;	/* low level flags */
	
unsigned long status;	/* thread-synchronous flags */
	
u32 cpu;		/* current CPU */
	
int preempt_count;	/* 0 => preemptable, <0 => BUG */

	
mm_segment_t addr_limit;	/* thread address space */

	u8 supervisor_stack[0] __aligned(8);
};

#else /* !__ASSEMBLY__ */

#include <generated/asm-offsets.h>

#endif

#ifdef CONFIG_4KSTACKS

#define THREAD_SHIFT		12
#else

#define THREAD_SHIFT		13
#endif

#if THREAD_SHIFT >= PAGE_SHIFT

#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)
#else

#define THREAD_SIZE_ORDER	0
#endif


#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)


#define STACK_WARN		(THREAD_SIZE/8)
/*
 * macros/functions for gaining access to the thread information structure
 */
#ifndef __ASSEMBLY__


#define INIT_THREAD_INFO(tsk)			\
{                                               \
        .task           = &tsk,                 \
        .flags          = 0,                    \
        .cpu            = 0,                    \
        .preempt_count  = INIT_PREEMPT_COUNT,   \
        .addr_limit     = KERNEL_DS,            \
}


#define init_thread_info	(init_thread_union.thread_info)

#define init_stack		(init_thread_union.stack)

/* how to get the current stack pointer from C */
register unsigned long current_stack_pointer asm("A0StP") __used;

/* how to get the thread information struct from C */


static inline struct thread_info *current_thread_info(void)
{
	return (struct thread_info *)(current_stack_pointer &
				      ~(THREAD_SIZE - 1));
}

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#define __HAVE_ARCH_KSTACK_END


static inline int kstack_end(void *addr)
{
	return addr == (void *) (((unsigned long) addr & ~(THREAD_SIZE - 1))
				 + sizeof(struct thread_info));
}

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#endif

/*
 * thread information flags
 * - these are process state flags that various assembly files may need to
 *   access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */

#define TIF_SYSCALL_TRACE	0	
/* syscall trace active */

#define TIF_SIGPENDING		1	
/* signal pending */

#define TIF_NEED_RESCHED	2	
/* rescheduling necessary */

#define TIF_SINGLESTEP		3	
/* restore singlestep on return to user
                                           mode */

#define TIF_SYSCALL_AUDIT	4	
/* syscall auditing active */

#define TIF_SECCOMP		5	
/* secure computing */

#define TIF_RESTORE_SIGMASK	6	
/* restore signal mask in do_signal() */

#define TIF_NOTIFY_RESUME	7	
/* callback before returning to user */

#define TIF_MEMDIE		8	
/* is terminating due to OOM killer */

#define TIF_SYSCALL_TRACEPOINT	9	
/* syscall tracepoint instrumentation */



#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)

#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)

#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)

#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)

#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)

#define _TIF_SECCOMP		(1<<TIF_SECCOMP)

#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)

#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)

#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)

/* work to do in syscall trace */

#define _TIF_WORK_SYSCALL_MASK	(_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
                                 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
                                 _TIF_SYSCALL_TRACEPOINT)

/* work to do on any return to u-space */

#define _TIF_ALLWORK_MASK	(_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
                                 _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
                                 _TIF_SINGLESTEP    | _TIF_RESTORE_SIGMASK | \
                                 _TIF_NOTIFY_RESUME)

/* work to do on interrupt/exception return */

#define _TIF_WORK_MASK		(_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
                                 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))

#endif /* _ASM_THREAD_INFO_H */
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Directory: arch/metag/include/asm

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