cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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thread_info.h (3440B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
      4 *
      5 * Vineetg: Oct 2009
      6 *  No need for ARC specific thread_info allocator (kmalloc/free). This is
      7 *  anyways one page allocation, thus slab alloc can be short-circuited and
      8 *  the generic version (get_free_page) would be loads better.
      9 *
     10 * Sameer Dhavale: Codito Technologies 2004
     11 */
     12
     13#ifndef _ASM_THREAD_INFO_H
     14#define _ASM_THREAD_INFO_H
     15
     16#include <asm/page.h>
     17
     18#ifdef CONFIG_16KSTACKS
     19#define THREAD_SIZE_ORDER 1
     20#else
     21#define THREAD_SIZE_ORDER 0
     22#endif
     23
     24#define THREAD_SIZE     (PAGE_SIZE << THREAD_SIZE_ORDER)
     25#define THREAD_SHIFT	(PAGE_SHIFT << THREAD_SIZE_ORDER)
     26
     27#ifndef __ASSEMBLY__
     28
     29#include <linux/thread_info.h>
     30
     31/*
     32 * low level task data that entry.S needs immediate access to
     33 * - this struct should fit entirely inside of one cache line
     34 * - this struct shares the supervisor stack pages
     35 * - if the contents of this structure are changed, the assembly constants
     36 *   must also be changed
     37 */
     38struct thread_info {
     39	unsigned long flags;		/* low level flags */
     40	int preempt_count;		/* 0 => preemptable, <0 => BUG */
     41	struct task_struct *task;	/* main task structure */
     42	__u32 cpu;			/* current CPU */
     43	unsigned long thr_ptr;		/* TLS ptr */
     44};
     45
     46/*
     47 * macros/functions for gaining access to the thread information structure
     48 *
     49 * preempt_count needs to be 1 initially, until the scheduler is functional.
     50 */
     51#define INIT_THREAD_INFO(tsk)			\
     52{						\
     53	.task       = &tsk,			\
     54	.flags      = 0,			\
     55	.cpu        = 0,			\
     56	.preempt_count  = INIT_PREEMPT_COUNT,	\
     57}
     58
     59static inline __attribute_const__ struct thread_info *current_thread_info(void)
     60{
     61	register unsigned long sp asm("sp");
     62	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
     63}
     64
     65#endif /* !__ASSEMBLY__ */
     66
     67/*
     68 * thread information flags
     69 * - these are process state flags that various assembly files may need to
     70 *   access
     71 * - pending work-to-be-done flags are in LSW
     72 * - other flags in MSW
     73 */
     74#define TIF_RESTORE_SIGMASK	0	/* restore sig mask in do_signal() */
     75#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
     76#define TIF_SIGPENDING		2	/* signal pending */
     77#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
     78#define TIF_SYSCALL_AUDIT	4	/* syscall auditing active */
     79#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
     80#define TIF_SYSCALL_TRACE	15	/* syscall trace active */
     81/* true if poll_idle() is polling TIF_NEED_RESCHED */
     82#define TIF_MEMDIE		16
     83#define TIF_SYSCALL_TRACEPOINT	17	/* syscall tracepoint instrumentation */
     84
     85#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
     86#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
     87#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
     88#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
     89#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
     90#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
     91#define _TIF_MEMDIE		(1<<TIF_MEMDIE)
     92#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)
     93
     94/* work to do on interrupt/exception return */
     95#define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
     96				 _TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL)
     97
     98#define _TIF_SYSCALL_WORK	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT)
     99
    100/*
    101 * _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it.
    102 * SYSCALL_TRACE is anyway separately/unconditionally tested right after a
    103 * syscall, so all that remains to be tested is _TIF_WORK_MASK
    104 */
    105
    106#endif /* _ASM_THREAD_INFO_H */