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 (4154B)

      1/*
      2 * include/asm-xtensa/thread_info.h
      3 *
      4 * This file is subject to the terms and conditions of the GNU General Public
      5 * License.  See the file "COPYING" in the main directory of this archive
      6 * for more details.
      7 *
      8 * Copyright (C) 2001 - 2005 Tensilica Inc.
      9 */
     10
     11#ifndef _XTENSA_THREAD_INFO_H
     12#define _XTENSA_THREAD_INFO_H
     13
     14#include <linux/stringify.h>
     15#include <asm/kmem_layout.h>
     16
     17#define CURRENT_SHIFT KERNEL_STACK_SHIFT
     18
     19#ifndef __ASSEMBLY__
     20# include <asm/processor.h>
     21#endif
     22
     23/*
     24 * low level task data that entry.S needs immediate access to
     25 * - this struct should fit entirely inside of one cache line
     26 * - this struct shares the supervisor stack pages
     27 * - if the contents of this structure are changed, the assembly constants
     28 *   must also be changed
     29 */
     30
     31#ifndef __ASSEMBLY__
     32
     33#if XTENSA_HAVE_COPROCESSORS
     34
     35typedef struct xtregs_coprocessor {
     36	xtregs_cp0_t cp0;
     37	xtregs_cp1_t cp1;
     38	xtregs_cp2_t cp2;
     39	xtregs_cp3_t cp3;
     40	xtregs_cp4_t cp4;
     41	xtregs_cp5_t cp5;
     42	xtregs_cp6_t cp6;
     43	xtregs_cp7_t cp7;
     44} xtregs_coprocessor_t;
     45
     46#endif
     47
     48struct thread_info {
     49	struct task_struct	*task;		/* main task structure */
     50	unsigned long		flags;		/* low level flags */
     51	unsigned long		status;		/* thread-synchronous flags */
     52	__u32			cpu;		/* current CPU */
     53	__s32			preempt_count;	/* 0 => preemptable,< 0 => BUG*/
     54
     55#if XCHAL_HAVE_EXCLUSIVE
     56	/* result of the most recent exclusive store */
     57	unsigned long		atomctl8;
     58#endif
     59#ifdef CONFIG_USER_ABI_CALL0_PROBE
     60	/* Address where PS.WOE was enabled by the ABI probing code */
     61	unsigned long		ps_woe_fix_addr;
     62#endif
     63
     64	/*
     65	 * If i-th bit is set then coprocessor state is loaded into the
     66	 * coprocessor i on CPU cp_owner_cpu.
     67	 */
     68	unsigned long		cpenable;
     69	u32			cp_owner_cpu;
     70	/* Allocate storage for extra user states and coprocessor states. */
     71#if XTENSA_HAVE_COPROCESSORS
     72	xtregs_coprocessor_t	xtregs_cp;
     73#endif
     74	xtregs_user_t		xtregs_user;
     75};
     76
     77#endif
     78
     79/*
     80 * macros/functions for gaining access to the thread information structure
     81 */
     82
     83#ifndef __ASSEMBLY__
     84
     85#define INIT_THREAD_INFO(tsk)			\
     86{						\
     87	.task		= &tsk,			\
     88	.flags		= 0,			\
     89	.cpu		= 0,			\
     90	.preempt_count	= INIT_PREEMPT_COUNT,	\
     91}
     92
     93/* how to get the thread information struct from C */
     94static inline struct thread_info *current_thread_info(void)
     95{
     96	struct thread_info *ti;
     97	 __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t"
     98	         "xor %0, a1, %0" : "=&r" (ti) : );
     99	return ti;
    100}
    101
    102#else /* !__ASSEMBLY__ */
    103
    104/* how to get the thread information struct from ASM */
    105#define GET_THREAD_INFO(reg,sp) \
    106	extui reg, sp, 0, CURRENT_SHIFT; \
    107	xor   reg, sp, reg
    108#endif
    109
    110
    111/*
    112 * thread information flags
    113 * - these are process state flags that various assembly files may need to access
    114 */
    115#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
    116#define TIF_SIGPENDING		1	/* signal pending */
    117#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
    118#define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
    119#define TIF_SYSCALL_TRACEPOINT	4	/* syscall tracepoint instrumentation */
    120#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
    121#define TIF_RESTORE_SIGMASK	6	/* restore signal mask in do_signal() */
    122#define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
    123#define TIF_DB_DISABLED		8	/* debug trap disabled for syscall */
    124#define TIF_SYSCALL_AUDIT	9	/* syscall auditing active */
    125#define TIF_SECCOMP		10	/* secure computing */
    126#define TIF_MEMDIE		11	/* is terminating due to OOM killer */
    127
    128#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
    129#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
    130#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
    131#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
    132#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)
    133#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
    134#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
    135#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
    136#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
    137
    138#define _TIF_WORK_MASK		(_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
    139				 _TIF_SYSCALL_TRACEPOINT | \
    140				 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
    141
    142#define THREAD_SIZE KERNEL_STACK_SIZE
    143#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
    144
    145#endif	/* _XTENSA_THREAD_INFO */