thread_info.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef __ASM_SH_THREAD_INFO_H
  3#define __ASM_SH_THREAD_INFO_H
  4
  5/* SuperH version
  6 * Copyright (C) 2002  Niibe Yutaka
  7 *
  8 * The copyright of original i386 version is:
  9 *
 10 *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
 11 *  - Incorporating suggestions made by Linus Torvalds and Dave Miller
 12 */
 13#include <asm/page.h>
 14
 15/*
 16 * Page fault error code bits
 17 */
 18#define FAULT_CODE_WRITE	(1 << 0)	/* write access */
 19#define FAULT_CODE_INITIAL	(1 << 1)	/* initial page write */
 20#define FAULT_CODE_ITLB		(1 << 2)	/* ITLB miss */
 21#define FAULT_CODE_PROT		(1 << 3)	/* protection fault */
 22#define FAULT_CODE_USER		(1 << 4)	/* user-mode access */
 23
 24#ifndef __ASSEMBLER__
 25#include <asm/processor.h>
 26
 27struct thread_info {
 28	struct task_struct	*task;		/* main task structure */
 29	unsigned long		flags;		/* low level flags */
 30	__u32			status;		/* thread synchronous flags */
 31	__u32			cpu;
 32	int			preempt_count; /* 0 => preemptable, <0 => BUG */
 33	unsigned long		previous_sp;	/* sp of previous stack in case
 34						   of nested IRQ stacks */
 35	__u8			supervisor_stack[];
 36};
 37
 38#endif
 39
 40#if defined(CONFIG_4KSTACKS)
 41#define THREAD_SHIFT	12
 42#else
 43#define THREAD_SHIFT	13
 44#endif
 45
 46#define THREAD_SIZE	(1 << THREAD_SHIFT)
 47#define STACK_WARN	(THREAD_SIZE >> 3)
 48
 49/*
 50 * macros/functions for gaining access to the thread information structure
 51 */
 52#ifndef __ASSEMBLER__
 53#define INIT_THREAD_INFO(tsk)			\
 54{						\
 55	.task		= &tsk,			\
 56	.flags		= 0,			\
 57	.status		= 0,			\
 58	.cpu		= 0,			\
 59	.preempt_count	= INIT_PREEMPT_COUNT,	\
 60}
 61
 62/* how to get the current stack pointer from C */
 63register unsigned long current_stack_pointer asm("r15") __used;
 64
 65/* how to get the thread information struct from C */
 66static inline struct thread_info *current_thread_info(void)
 67{
 68	struct thread_info *ti;
 69#if defined(CONFIG_CPU_HAS_SR_RB)
 70	__asm__ __volatile__ ("stc	r7_bank, %0" : "=r" (ti));
 71#else
 72	unsigned long __dummy;
 73
 74	__asm__ __volatile__ (
 75		"mov	r15, %0\n\t"
 76		"and	%1, %0\n\t"
 77		: "=&r" (ti), "=r" (__dummy)
 78		: "1" (~(THREAD_SIZE - 1))
 79		: "memory");
 80#endif
 81
 82	return ti;
 83}
 84
 85#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)
 86
 87extern void init_thread_xstate(void);
 88
 89#endif /* __ASSEMBLER__ */
 90
 91/*
 92 * Thread information flags
 93 *
 94 * - Limited to 24 bits, upper byte used for fault code encoding.
 95 *
 96 * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
 97 *   we blow the tst immediate size constraints and need to fix up
 98 *   arch/sh/kernel/entry-common.S.
 99 */
100#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
101#define TIF_SIGPENDING		1	/* signal pending */
102#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
103#define TIF_NOTIFY_SIGNAL	3	/* signal notifications exist */
104#define TIF_SINGLESTEP		4	/* singlestepping active */
105#define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
106#define TIF_SECCOMP		6	/* secure computing */
107#define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
108#define TIF_SYSCALL_TRACEPOINT	8	/* for ftrace syscall instrumentation */
109#define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
110#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
111
112#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
113#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
114#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
115#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
116#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
117#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
118#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
119#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
120#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
121#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
122
123/* work to do in syscall trace */
124#define _TIF_WORK_SYSCALL_MASK	(_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
125				 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP    | \
126				 _TIF_SYSCALL_TRACEPOINT)
127
128/* work to do on any return to u-space */
129#define _TIF_ALLWORK_MASK	(_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
130				 _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
131				 _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
132				 _TIF_SYSCALL_TRACEPOINT | _TIF_NOTIFY_SIGNAL)
133
134/* work to do on interrupt/exception return */
135#define _TIF_WORK_MASK		(_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
136				 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
137
138/*
139 * Thread-synchronous status.
140 *
141 * This is different from the flags in that nobody else
142 * ever touches our thread-synchronous status, so we don't
143 * have to worry about atomic accesses.
144 */
145#define TS_USEDFPU		0x0002	/* FPU used by this task this quantum */
146
147#ifndef __ASSEMBLER__
148
149#define TI_FLAG_FAULT_CODE_SHIFT	24
150
151/*
152 * Additional thread flag encoding
153 */
154static inline void set_thread_fault_code(unsigned int val)
155{
156	struct thread_info *ti = current_thread_info();
157	ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
158		| (val << TI_FLAG_FAULT_CODE_SHIFT);
159}
160
161static inline unsigned int get_thread_fault_code(void)
162{
163	struct thread_info *ti = current_thread_info();
164	return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
165}
166
167#endif	/* !__ASSEMBLER__ */
168#endif /* __ASM_SH_THREAD_INFO_H */