arch/mips/include/asm/thread_info.h - linux - Git at Google

 /* 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 => preemptable, <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 */
	/* 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 => preemptable, <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 */