[linux-2.6-block.git] / arch / mips / include / asm / thread_info.h

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

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__


#ifndef __ASSEMBLY__

#include <asm/processor.h>

/*
 * 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
 */
struct thread_info {
	struct task_struct	*task;		/* main task structure */
	unsigned long		flags;		/* low level flags */
	unsigned long		tp_value;	/* thread pointer */
	__u32			cpu;		/* current CPU */
	int			preempt_count;	/* 0 => preemptible, <0 => BUG */
	struct pt_regs		*regs;
	long			syscall;	/* syscall number */
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.flags		= _TIF_FIXADE,		\
	.cpu		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
}

/*
 * A pointer to the struct thread_info for the currently executing thread is
 * held in register $28/$gp.
 *
 * We declare __current_thread_info as a global register variable rather than a
 * local register variable within current_thread_info() because clang doesn't
 * support explicit local register variables.
 *
 * When building the VDSO we take care not to declare the global register
 * variable because this causes GCC to not preserve the value of $28/$gp in
 * functions that change its value (which is common in the PIC VDSO when
 * accessing the GOT). Since the VDSO shouldn't be accessing
 * __current_thread_info anyway we declare it extern in order to cause a link
 * failure if it's referenced.
 */
#ifdef __VDSO__
extern struct thread_info *__current_thread_info;
#else
register struct thread_info *__current_thread_info __asm__("$28");
#endif

static inline struct thread_info *current_thread_info(void)
{
	return __current_thread_info;
}

#ifdef CONFIG_ARCH_HAS_CURRENT_STACK_POINTER
register unsigned long current_stack_pointer __asm__("sp");
#endif

#endif /* !__ASSEMBLY__ */

/* thread information allocation */
#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
#define THREAD_SIZE_ORDER (1)
#endif
#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
#define THREAD_SIZE_ORDER (2)
#endif
#ifdef CONFIG_PAGE_SIZE_8KB
#define THREAD_SIZE_ORDER (1)
#endif
#ifdef CONFIG_PAGE_SIZE_16KB
#define THREAD_SIZE_ORDER (0)
#endif
#ifdef CONFIG_PAGE_SIZE_32KB
#define THREAD_SIZE_ORDER (0)
#endif
#ifdef CONFIG_PAGE_SIZE_64KB
#define THREAD_SIZE_ORDER (0)
#endif

#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
#define THREAD_MASK (THREAD_SIZE - 1UL)

#define STACK_WARN	(THREAD_SIZE / 8)

/*
 * 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_SIGPENDING		1	/* signal pending */
#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
#define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
#define TIF_SECCOMP		4	/* secure computing */
#define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
#define TIF_UPROBE		6	/* breakpointed or singlestepping */
#define TIF_NOTIFY_SIGNAL	7	/* signal notifications exist */
#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
#define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
#define TIF_NOHZ		19	/* in adaptive nohz mode */
#define TIF_FIXADE		20	/* Fix address errors in software */
#define TIF_LOGADE		21	/* Log address errors to syslog */
#define TIF_32BIT_REGS		22	/* 32-bit general purpose registers */
#define TIF_32BIT_ADDR		23	/* 32-bit address space (o32/n32) */
#define TIF_FPUBOUND		24	/* thread bound to FPU-full CPU set */
#define TIF_LOAD_WATCH		25	/* If set, load watch registers */
#define TIF_SYSCALL_TRACEPOINT	26	/* syscall tracepoint instrumentation */
#define TIF_32BIT_FPREGS	27	/* 32-bit floating point registers */
#define TIF_HYBRID_FPREGS	28	/* 64b FP registers, odd singles in bits 63:32 of even doubles */
#define TIF_USEDMSA		29	/* MSA has been used this quantum */
#define TIF_MSA_CTX_LIVE	30	/* MSA context must be preserved */
#define TIF_SYSCALL_TRACE	31	/* syscall trace active */

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
#define _TIF_UPROBE		(1<<TIF_UPROBE)
#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
#define _TIF_USEDFPU		(1<<TIF_USEDFPU)
#define _TIF_NOHZ		(1<<TIF_NOHZ)
#define _TIF_FIXADE		(1<<TIF_FIXADE)
#define _TIF_LOGADE		(1<<TIF_LOGADE)
#define _TIF_32BIT_REGS		(1<<TIF_32BIT_REGS)
#define _TIF_32BIT_ADDR		(1<<TIF_32BIT_ADDR)
#define _TIF_FPUBOUND		(1<<TIF_FPUBOUND)
#define _TIF_LOAD_WATCH		(1<<TIF_LOAD_WATCH)
#define _TIF_32BIT_FPREGS	(1<<TIF_32BIT_FPREGS)
#define _TIF_HYBRID_FPREGS	(1<<TIF_HYBRID_FPREGS)
#define _TIF_USEDMSA		(1<<TIF_USEDMSA)
#define _TIF_MSA_CTX_LIVE	(1<<TIF_MSA_CTX_LIVE)
#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)

#define _TIF_WORK_SYSCALL_ENTRY	(_TIF_NOHZ | _TIF_SYSCALL_TRACE |	\
				 _TIF_SYSCALL_AUDIT | \
				 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)

/* work to do in syscall_trace_leave() */
#define _TIF_WORK_SYSCALL_EXIT	(_TIF_NOHZ | _TIF_SYSCALL_TRACE |	\
				 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK		\
	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME |	\
	 _TIF_UPROBE | _TIF_NOTIFY_SIGNAL)
/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK	(_TIF_NOHZ | _TIF_WORK_MASK |		\
				 _TIF_WORK_SYSCALL_EXIT |		\
				 _TIF_SYSCALL_TRACEPOINT)

/*
 * We stash processor id into a COP0 register to retrieve it fast
 * at kernel exception entry.
 */
#if   defined(CONFIG_MIPS_PGD_C0_CONTEXT)
#define SMP_CPUID_REG		20, 0	/* XCONTEXT */
#define ASM_SMP_CPUID_REG	$20
#define SMP_CPUID_PTRSHIFT	48
#else
#define SMP_CPUID_REG		4, 0	/* CONTEXT */
#define ASM_SMP_CPUID_REG	$4
#define SMP_CPUID_PTRSHIFT	23
#endif

#ifdef CONFIG_64BIT
#define SMP_CPUID_REGSHIFT	(SMP_CPUID_PTRSHIFT + 3)
#else
#define SMP_CPUID_REGSHIFT	(SMP_CPUID_PTRSHIFT + 2)
#endif

#define ASM_CPUID_MFC0		MFC0
#define UASM_i_CPUID_MFC0	UASM_i_MFC0

#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/* thread_info.h: MIPS low-level thread information
	3	*
	4	* Copyright (C) 2002 David Howells (dhowells@redhat.com)
	5	* - Incorporating suggestions made by Linus Torvalds and Dave Miller
	6	*/
	7
	8	#ifndef _ASM_THREAD_INFO_H
	9	#define _ASM_THREAD_INFO_H
	10
	11	#ifdef __KERNEL__
	12
	13
	14	#ifndef __ASSEMBLY__
	15
	16	#include <asm/processor.h>
	17
	18	/*
	19	* low level task data that entry.S needs immediate access to
	20	* - this struct should fit entirely inside of one cache line
	21	* - this struct shares the supervisor stack pages
	22	* - if the contents of this structure are changed, the assembly constants
	23	* must also be changed
	24	*/
	25	struct thread_info {
	26	struct task_struct task; / main task structure */
	27	unsigned long flags; /* low level flags */
	28	unsigned long tp_value; /* thread pointer */
	29	__u32 cpu; /* current CPU */
	30	int preempt_count; /* 0 => preemptible, <0 => BUG */
	31	struct pt_regs *regs;
	32	long syscall; /* syscall number */
	33	};
	34
	35	/*
	36	* macros/functions for gaining access to the thread information structure
	37	*/
	38	#define INIT_THREAD_INFO(tsk) \
	39	{ \
	40	.task = &tsk, \
	41	.flags = _TIF_FIXADE, \
	42	.cpu = 0, \
	43	.preempt_count = INIT_PREEMPT_COUNT, \
	44	}
	45
	46	/*
	47	* A pointer to the struct thread_info for the currently executing thread is
	48	* held in register $28/$gp.
	49	*
	50	* We declare __current_thread_info as a global register variable rather than a
	51	* local register variable within current_thread_info() because clang doesn't
	52	* support explicit local register variables.
	53	*
	54	* When building the VDSO we take care not to declare the global register
	55	* variable because this causes GCC to not preserve the value of $28/$gp in
	56	* functions that change its value (which is common in the PIC VDSO when
	57	* accessing the GOT). Since the VDSO shouldn't be accessing
	58	* __current_thread_info anyway we declare it extern in order to cause a link
	59	* failure if it's referenced.
	60	*/
	61	#ifdef __VDSO__
	62	extern struct thread_info *__current_thread_info;
	63	#else
	64	register struct thread_info *__current_thread_info __asm__("$28");
	65	#endif
	66
	67	static inline struct thread_info *current_thread_info(void)
	68	{
	69	return __current_thread_info;
	70	}
	71
	72	#ifdef CONFIG_ARCH_HAS_CURRENT_STACK_POINTER
	73	register unsigned long current_stack_pointer __asm__("sp");
	74	#endif
	75
	76	#endif /* !__ASSEMBLY__ */
	77
	78	/* thread information allocation */
	79	#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
	80	#define THREAD_SIZE_ORDER (1)
	81	#endif
	82	#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
	83	#define THREAD_SIZE_ORDER (2)
	84	#endif
	85	#ifdef CONFIG_PAGE_SIZE_8KB
	86	#define THREAD_SIZE_ORDER (1)
	87	#endif
	88	#ifdef CONFIG_PAGE_SIZE_16KB
	89	#define THREAD_SIZE_ORDER (0)
	90	#endif
	91	#ifdef CONFIG_PAGE_SIZE_32KB
	92	#define THREAD_SIZE_ORDER (0)
	93	#endif
	94	#ifdef CONFIG_PAGE_SIZE_64KB
	95	#define THREAD_SIZE_ORDER (0)
	96	#endif
	97
	98	#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
	99	#define THREAD_MASK (THREAD_SIZE - 1UL)
	100
	101	#define STACK_WARN (THREAD_SIZE / 8)
	102
	103	/*
	104	* thread information flags
	105	* - these are process state flags that various assembly files may need to
	106	* access
	107	* - pending work-to-be-done flags are in LSW
	108	* - other flags in MSW
	109	*/
	110	#define TIF_SIGPENDING 1 /* signal pending */
	111	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	112	#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
	113	#define TIF_SECCOMP 4 /* secure computing */
	114	#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
	115	#define TIF_UPROBE 6 /* breakpointed or singlestepping */
	116	#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */
	117	#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
	118	#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
	119	#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
	120	#define TIF_NOHZ 19 /* in adaptive nohz mode */
	121	#define TIF_FIXADE 20 /* Fix address errors in software */
	122	#define TIF_LOGADE 21 /* Log address errors to syslog */
	123	#define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */
	124	#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
	125	#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
	126	#define TIF_LOAD_WATCH 25 /* If set, load watch registers */
	127	#define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */
	128	#define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */
	129	#define TIF_HYBRID_FPREGS 28 /* 64b FP registers, odd singles in bits 63:32 of even doubles */
	130	#define TIF_USEDMSA 29 /* MSA has been used this quantum */
	131	#define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */
	132	#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
	133
	134	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
	135	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	136	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	137	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	138	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
	139	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
	140	#define _TIF_UPROBE (1<<TIF_UPROBE)
	141	#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
	142	#define _TIF_USEDFPU (1<<TIF_USEDFPU)
	143	#define _TIF_NOHZ (1<<TIF_NOHZ)
	144	#define _TIF_FIXADE (1<<TIF_FIXADE)
	145	#define _TIF_LOGADE (1<<TIF_LOGADE)
	146	#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
	147	#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
	148	#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
	149	#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
	150	#define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS)
	151	#define _TIF_HYBRID_FPREGS (1<<TIF_HYBRID_FPREGS)
	152	#define _TIF_USEDMSA (1<<TIF_USEDMSA)
	153	#define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE)
	154	#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
	155
	156	#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ \| _TIF_SYSCALL_TRACE \| \
	157	_TIF_SYSCALL_AUDIT \| \
	158	_TIF_SYSCALL_TRACEPOINT \| _TIF_SECCOMP)
	159
	160	/* work to do in syscall_trace_leave() */
	161	#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ \| _TIF_SYSCALL_TRACE \| \
	162	_TIF_SYSCALL_AUDIT \| _TIF_SYSCALL_TRACEPOINT)
	163
	164	/* work to do on interrupt/exception return */
	165	#define _TIF_WORK_MASK \
	166	(_TIF_SIGPENDING \| _TIF_NEED_RESCHED \| _TIF_NOTIFY_RESUME \| \
	167	_TIF_UPROBE \| _TIF_NOTIFY_SIGNAL)
	168	/* work to do on any return to u-space */
	169	#define _TIF_ALLWORK_MASK (_TIF_NOHZ \| _TIF_WORK_MASK \| \
	170	_TIF_WORK_SYSCALL_EXIT \| \
	171	_TIF_SYSCALL_TRACEPOINT)
	172
	173	/*
	174	* We stash processor id into a COP0 register to retrieve it fast
	175	* at kernel exception entry.
	176	*/
	177	#if defined(CONFIG_MIPS_PGD_C0_CONTEXT)
	178	#define SMP_CPUID_REG 20, 0 /* XCONTEXT */
	179	#define ASM_SMP_CPUID_REG $20
	180	#define SMP_CPUID_PTRSHIFT 48
	181	#else
	182	#define SMP_CPUID_REG 4, 0 /* CONTEXT */
	183	#define ASM_SMP_CPUID_REG $4
	184	#define SMP_CPUID_PTRSHIFT 23
	185	#endif
	186
	187	#ifdef CONFIG_64BIT
	188	#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3)
	189	#else
	190	#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2)
	191	#endif
	192
	193	#define ASM_CPUID_MFC0 MFC0
	194	#define UASM_i_CPUID_MFC0 UASM_i_MFC0
	195
	196	#endif /* __KERNEL__ */
	197	#endif /* _ASM_THREAD_INFO_H */