thread_info.h

  1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Based on arch/arm/include/asm/thread_info.h
  4 *
  5 * Copyright (C) 2002 Russell King.
  6 * Copyright (C) 2012 ARM Ltd.
  7 */
  8#ifndef __ASM_THREAD_INFO_H
  9#define __ASM_THREAD_INFO_H
 10
 11#include <linux/compiler.h>
 12
 13#ifndef __ASSEMBLER__
 14
 15struct task_struct;
 16
 17#include <asm/memory.h>
 18#include <asm/stack_pointer.h>
 19#include <asm/types.h>
 20
 21/*
 22 * low level task data that entry.S needs immediate access to.
 23 */
 24struct thread_info {
 25	unsigned long		flags;		/* low level flags */
 26#ifdef CONFIG_ARM64_SW_TTBR0_PAN
 27	u64			ttbr0;		/* saved TTBR0_EL1 */
 28#endif
 29	union {
 30		u64		preempt_count;	/* 0 => preemptible, <0 => bug */
 31		struct {
 32#ifdef CONFIG_CPU_BIG_ENDIAN
 33			u32	need_resched;
 34			u32	count;
 35#else
 36			u32	count;
 37			u32	need_resched;
 38#endif
 39		} preempt;
 40	};
 41#ifdef CONFIG_SHADOW_CALL_STACK
 42	void			*scs_base;
 43	void			*scs_sp;
 44#endif
 45	u32			cpu;
 46};
 47
 48#define thread_saved_pc(tsk)	\
 49	((unsigned long)(tsk->thread.cpu_context.pc))
 50#define thread_saved_sp(tsk)	\
 51	((unsigned long)(tsk->thread.cpu_context.sp))
 52#define thread_saved_fp(tsk)	\
 53	((unsigned long)(tsk->thread.cpu_context.fp))
 54
 55void arch_setup_new_exec(void);
 56#define arch_setup_new_exec     arch_setup_new_exec
 57
 58#endif
 59
 60#define TIF_SIGPENDING		0	/* signal pending */
 61#define TIF_NEED_RESCHED	1	/* rescheduling necessary */
 62#define TIF_NEED_RESCHED_LAZY	2	/* Lazy rescheduling needed */
 63#define TIF_NOTIFY_RESUME	3	/* callback before returning to user */
 64#define TIF_FOREIGN_FPSTATE	4	/* CPU's FP state is not current's */
 65#define TIF_UPROBE		5	/* uprobe breakpoint or singlestep */
 66#define TIF_MTE_ASYNC_FAULT	6	/* MTE Asynchronous Tag Check Fault */
 67#define TIF_NOTIFY_SIGNAL	7	/* signal notifications exist */
 68#define TIF_SYSCALL_TRACE	8	/* syscall trace active */
 69#define TIF_SYSCALL_AUDIT	9	/* syscall auditing */
 70#define TIF_SYSCALL_TRACEPOINT	10	/* syscall tracepoint for ftrace */
 71#define TIF_SECCOMP		11	/* syscall secure computing */
 72#define TIF_SYSCALL_EMU		12	/* syscall emulation active */
 73#define TIF_PATCH_PENDING	13	/* pending live patching update */
 74#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
 75#define TIF_FREEZE		19
 76#define TIF_RESTORE_SIGMASK	20
 77#define TIF_SINGLESTEP		21
 78#define TIF_32BIT		22	/* 32bit process */
 79#define TIF_SVE			23	/* Scalable Vector Extension in use */
 80#define TIF_SVE_VL_INHERIT	24	/* Inherit SVE vl_onexec across exec */
 81#define TIF_SSBD		25	/* Wants SSB mitigation */
 82#define TIF_TAGGED_ADDR		26	/* Allow tagged user addresses */
 83#define TIF_SME			27	/* SME in use */
 84#define TIF_SME_VL_INHERIT	28	/* Inherit SME vl_onexec across exec */
 85#define TIF_KERNEL_FPSTATE	29	/* Task is in a kernel mode FPSIMD section */
 86#define TIF_TSC_SIGSEGV		30	/* SIGSEGV on counter-timer access */
 87#define TIF_LAZY_MMU		31	/* Task in lazy mmu mode */
 88#define TIF_LAZY_MMU_PENDING	32	/* Ops pending for lazy mmu mode exit */
 89
 90#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 91#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 92#define _TIF_NEED_RESCHED_LAZY	(1 << TIF_NEED_RESCHED_LAZY)
 93#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 94#define _TIF_FOREIGN_FPSTATE	(1 << TIF_FOREIGN_FPSTATE)
 95#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 96#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
 97#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
 98#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
 99#define _TIF_SYSCALL_EMU	(1 << TIF_SYSCALL_EMU)
100#define _TIF_PATCH_PENDING	(1 << TIF_PATCH_PENDING)
101#define _TIF_UPROBE		(1 << TIF_UPROBE)
102#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
103#define _TIF_32BIT		(1 << TIF_32BIT)
104#define _TIF_SVE		(1 << TIF_SVE)
105#define _TIF_MTE_ASYNC_FAULT	(1 << TIF_MTE_ASYNC_FAULT)
106#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
107#define _TIF_TSC_SIGSEGV	(1 << TIF_TSC_SIGSEGV)
108
109#define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY | \
110				 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
111				 _TIF_UPROBE | _TIF_MTE_ASYNC_FAULT | \
112				 _TIF_NOTIFY_SIGNAL | _TIF_SIGPENDING | \
113				 _TIF_PATCH_PENDING)
114
115#define _TIF_SYSCALL_WORK	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
116				 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
117				 _TIF_SYSCALL_EMU)
118
119#ifdef CONFIG_SHADOW_CALL_STACK
120#define INIT_SCS							\
121	.scs_base	= init_shadow_call_stack,			\
122	.scs_sp		= init_shadow_call_stack,
123#else
124#define INIT_SCS
125#endif
126
127#define INIT_THREAD_INFO(tsk)						\
128{									\
129	.flags		= _TIF_FOREIGN_FPSTATE,				\
130	.preempt_count	= INIT_PREEMPT_COUNT,				\
131	INIT_SCS							\
132}
133
134#endif /* __ASM_THREAD_INFO_H */