/arch/alpha/include/asm/thread_info.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _ALPHA_THREAD_INFO_H
  3#define _ALPHA_THREAD_INFO_H
  4
  5#ifdef __KERNEL__
  6
  7#ifndef __ASSEMBLY__
  8#include <asm/processor.h>
  9#include <asm/types.h>
 10#include <asm/hwrpb.h>
 11#include <asm/sysinfo.h>
 12#endif
 13
 14#ifndef __ASSEMBLY__
 15struct thread_info {
 16	struct pcb_struct	pcb;		/* palcode state */
 17
 18	struct task_struct	*task;		/* main task structure */
 19	unsigned int		flags;		/* low level flags */
 20	unsigned int		ieee_state;	/* see fpu.h */
 21
 22	mm_segment_t		addr_limit;	/* thread address space */
 23	unsigned		cpu;		/* current CPU */
 24	int			preempt_count; /* 0 => preemptable, <0 => BUG */
 25	unsigned int		status;		/* thread-synchronous flags */
 26
 27	int bpt_nsaved;
 28	unsigned long bpt_addr[2];		/* breakpoint handling  */
 29	unsigned int bpt_insn[2];
 30};
 31
 32/*
 33 * Macros/functions for gaining access to the thread information structure.
 34 */
 35#define INIT_THREAD_INFO(tsk)			\
 36{						\
 37	.task		= &tsk,			\
 38	.addr_limit	= KERNEL_DS,		\
 39	.preempt_count	= INIT_PREEMPT_COUNT,	\
 40}
 41
 42/* How to get the thread information struct from C.  */
 43register struct thread_info *__current_thread_info __asm__("$8");
 44#define current_thread_info()  __current_thread_info
 45
 46#endif /* __ASSEMBLY__ */
 47
 48/* Thread information allocation.  */
 49#define THREAD_SIZE_ORDER 1
 50#define THREAD_SIZE (2*PAGE_SIZE)
 51
 52/*
 53 * Thread information flags:
 54 * - these are process state flags and used from assembly
 55 * - pending work-to-be-done flags come first and must be assigned to be
 56 *   within bits 0 to 7 to fit in and immediate operand.
 57 *
 58 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
 59 */
 60#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
 61#define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
 62#define TIF_SIGPENDING		2	/* signal pending */
 63#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
 64#define TIF_SYSCALL_AUDIT	4	/* syscall audit active */
 65#define TIF_DIE_IF_KERNEL	9	/* dik recursion lock */
 66#define TIF_MEMDIE		13	/* is terminating due to OOM killer */
 67#define TIF_POLLING_NRFLAG	14	/* idle is polling for TIF_NEED_RESCHED */
 68
 69#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 70#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 71#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 72#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 73#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
 74#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 75
 76/* Work to do on interrupt/exception return.  */
 77#define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
 78				 _TIF_NOTIFY_RESUME)
 79
 80/* Work to do on any return to userspace.  */
 81#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK		\
 82				 | _TIF_SYSCALL_TRACE)
 83
 84#define TS_UAC_NOPRINT		0x0001	/* ! Preserve the following three */
 85#define TS_UAC_NOFIX		0x0002	/* ! flags as they match          */
 86#define TS_UAC_SIGBUS		0x0004	/* ! userspace part of 'osf_sysinfo' */
 87
 88#define SET_UNALIGN_CTL(task,value)	({				\
 89	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
 90	if (value & PR_UNALIGN_NOPRINT)					\
 91		status |= TS_UAC_NOPRINT;				\
 92	if (value & PR_UNALIGN_SIGBUS)					\
 93		status |= TS_UAC_SIGBUS;				\
 94	if (value & 4)	/* alpha-specific */				\
 95		status |= TS_UAC_NOFIX;					\
 96	task_thread_info(task)->status = status;			\
 97	0; })
 98
 99#define GET_UNALIGN_CTL(task,value)	({				\
100	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
101	__u32 res = 0;							\
102	if (status & TS_UAC_NOPRINT)					\
103		res |= PR_UNALIGN_NOPRINT;				\
104	if (status & TS_UAC_SIGBUS)					\
105		res |= PR_UNALIGN_SIGBUS;				\
106	if (status & TS_UAC_NOFIX)					\
107		res |= 4;						\
108	put_user(res, (int __user *)(value));				\
109	})
110
111#endif /* __KERNEL__ */
112#endif /* _ALPHA_THREAD_INFO_H */