LCOV - code coverage report
Current view: top level - lkbce/arch/x86/include/asm - thread_info.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 5 5 100.0 %
Date: 2017-01-25 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /* thread_info.h: low-level thread information
       2             :  *
       3             :  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
       4             :  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
       5             :  */
       6             : 
       7             : #ifndef _ASM_X86_THREAD_INFO_H
       8             : #define _ASM_X86_THREAD_INFO_H
       9             : 
      10             : #include <linux/compiler.h>
      11             : #include <asm/page.h>
      12             : #include <asm/types.h>
      13             : 
      14             : /*
      15             :  * low level task data that entry.S needs immediate access to
      16             :  * - this struct should fit entirely inside of one cache line
      17             :  * - this struct shares the supervisor stack pages
      18             :  */
      19             : #ifndef __ASSEMBLY__
      20             : struct task_struct;
      21             : struct exec_domain;
      22             : #include <asm/processor.h>
      23             : #include <asm/ftrace.h>
      24             : #include <asm/atomic.h>
      25             : 
      26             : struct thread_info {
      27             :         struct task_struct      *task;          /* main task structure */
      28             :         struct exec_domain      *exec_domain;   /* execution domain */
      29             :         __u32                   flags;          /* low level flags */
      30             :         __u32                   status;         /* thread synchronous flags */
      31             :         __u32                   cpu;            /* current CPU */
      32             :         int                     preempt_count;  /* 0 => preemptable,
      33             :                                                    <0 => BUG */
      34             :         mm_segment_t            addr_limit;
      35             :         struct restart_block    restart_block;
      36             :         void __user             *sysenter_return;
      37             : #ifdef CONFIG_X86_32
      38             :         unsigned long           previous_esp;   /* ESP of the previous stack in
      39             :                                                    case of nested (IRQ) stacks
      40             :                                                 */
      41             :         __u8                    supervisor_stack[0];
      42             : #endif
      43             :         int                     uaccess_err;
      44             : };
      45             : 
      46             : #define INIT_THREAD_INFO(tsk)                   \
      47             : {                                               \
      48             :         .task           = &tsk,                     \
      49             :         .exec_domain    = &default_exec_domain,     \
      50             :         .flags          = 0,                    \
      51             :         .cpu            = 0,                    \
      52             :         .preempt_count  = INIT_PREEMPT_COUNT,   \
      53             :         .addr_limit     = KERNEL_DS,            \
      54             :         .restart_block = {                      \
      55             :                 .fn = do_no_restart_syscall,    \
      56             :         },                                      \
      57             : }
      58             : 
      59             : #define init_thread_info        (init_thread_union.thread_info)
      60             : #define init_stack              (init_thread_union.stack)
      61             : 
      62             : #else /* !__ASSEMBLY__ */
      63             : 
      64             : #include <asm/asm-offsets.h>
      65             : 
      66             : #endif
      67             : 
      68             : /*
      69             :  * thread information flags
      70             :  * - these are process state flags that various assembly files
      71             :  *   may need to access
      72             :  * - pending work-to-be-done flags are in LSW
      73             :  * - other flags in MSW
      74             :  * Warning: layout of LSW is hardcoded in entry.S
      75             :  */
      76             : #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
      77             : #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
      78             : #define TIF_SIGPENDING          2       /* signal pending */
      79             : #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
      80             : #define TIF_SINGLESTEP          4       /* reenable singlestep on user return*/
      81             : #define TIF_IRET                5       /* force IRET */
      82             : #define TIF_SYSCALL_EMU         6       /* syscall emulation active */
      83             : #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
      84             : #define TIF_SECCOMP             8       /* secure computing */
      85             : #define TIF_MCE_NOTIFY          10      /* notify userspace of an MCE */
      86             : #define TIF_USER_RETURN_NOTIFY  11      /* notify kernel of userspace return */
      87             : #define TIF_NOTSC               16      /* TSC is not accessible in userland */
      88             : #define TIF_IA32                17      /* 32bit process */
      89             : #define TIF_FORK                18      /* ret_from_fork */
      90             : #define TIF_MEMDIE              20
      91             : #define TIF_DEBUG               21      /* uses debug registers */
      92             : #define TIF_IO_BITMAP           22      /* uses I/O bitmap */
      93             : #define TIF_FREEZE              23      /* is freezing for suspend */
      94             : #define TIF_FORCED_TF           24      /* true if TF in eflags artificially */
      95             : #define TIF_DEBUGCTLMSR         25      /* uses thread_struct.debugctlmsr */
      96             : #define TIF_DS_AREA_MSR         26      /* uses thread_struct.ds_area_msr */
      97             : #define TIF_LAZY_MMU_UPDATES    27      /* task is updating the mmu lazily */
      98             : #define TIF_SYSCALL_TRACEPOINT  28      /* syscall tracepoint instrumentation */
      99             : 
     100             : #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
     101             : #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
     102             : #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
     103             : #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
     104             : #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
     105             : #define _TIF_IRET               (1 << TIF_IRET)
     106             : #define _TIF_SYSCALL_EMU        (1 << TIF_SYSCALL_EMU)
     107             : #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
     108             : #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
     109             : #define _TIF_MCE_NOTIFY         (1 << TIF_MCE_NOTIFY)
     110             : #define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY)
     111             : #define _TIF_NOTSC              (1 << TIF_NOTSC)
     112             : #define _TIF_IA32               (1 << TIF_IA32)
     113             : #define _TIF_FORK               (1 << TIF_FORK)
     114             : #define _TIF_DEBUG              (1 << TIF_DEBUG)
     115             : #define _TIF_IO_BITMAP          (1 << TIF_IO_BITMAP)
     116             : #define _TIF_FREEZE             (1 << TIF_FREEZE)
     117             : #define _TIF_FORCED_TF          (1 << TIF_FORCED_TF)
     118             : #define _TIF_DEBUGCTLMSR        (1 << TIF_DEBUGCTLMSR)
     119             : #define _TIF_DS_AREA_MSR        (1 << TIF_DS_AREA_MSR)
     120             : #define _TIF_LAZY_MMU_UPDATES   (1 << TIF_LAZY_MMU_UPDATES)
     121             : #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
     122             : 
     123             : /* work to do in syscall_trace_enter() */
     124             : #define _TIF_WORK_SYSCALL_ENTRY \
     125             :         (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT |   \
     126             :          _TIF_SECCOMP | _TIF_SINGLESTEP | _TIF_SYSCALL_TRACEPOINT)
     127             : 
     128             : /* work to do in syscall_trace_leave() */
     129             : #define _TIF_WORK_SYSCALL_EXIT  \
     130             :         (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP |    \
     131             :          _TIF_SYSCALL_TRACEPOINT)
     132             : 
     133             : /* work to do on interrupt/exception return */
     134             : #define _TIF_WORK_MASK                                                  \
     135             :         (0x0000FFFF &                                                       \
     136             :          ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|                       \
     137             :            _TIF_SINGLESTEP|_TIF_SECCOMP|_TIF_SYSCALL_EMU))
     138             : 
     139             : /* work to do on any return to user space */
     140             : #define _TIF_ALLWORK_MASK                                               \
     141             :         ((0x0000FFFF & ~_TIF_SECCOMP) | _TIF_SYSCALL_TRACEPOINT)
     142             : 
     143             : /* Only used for 64 bit */
     144             : #define _TIF_DO_NOTIFY_MASK                                             \
     145             :         (_TIF_SIGPENDING | _TIF_MCE_NOTIFY | _TIF_NOTIFY_RESUME |       \
     146             :          _TIF_USER_RETURN_NOTIFY)
     147             : 
     148             : /* flags to check in __switch_to() */
     149             : #define _TIF_WORK_CTXSW                                                 \
     150             :         (_TIF_IO_BITMAP|_TIF_DEBUGCTLMSR|_TIF_DS_AREA_MSR|_TIF_NOTSC)
     151             : 
     152             : #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
     153             : #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
     154             : 
     155             : #define PREEMPT_ACTIVE          0x10000000
     156             : 
     157             : /* thread information allocation */
     158             : #ifdef CONFIG_DEBUG_STACK_USAGE
     159             : #define THREAD_FLAGS (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
     160             : #else
     161             : #define THREAD_FLAGS (GFP_KERNEL | __GFP_NOTRACK)
     162             : #endif
     163             : 
     164             : #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
     165             : 
     166             : #define alloc_thread_info(tsk)                                          \
     167             :         ((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER))
     168             : 
     169             : #ifdef CONFIG_X86_32
     170             : 
     171             : #define STACK_WARN      (THREAD_SIZE/8)
     172             : /*
     173             :  * macros/functions for gaining access to the thread information structure
     174             :  *
     175             :  * preempt_count needs to be 1 initially, until the scheduler is functional.
     176             :  */
     177             : #ifndef __ASSEMBLY__
     178             : 
     179             : 
     180             : /* how to get the current stack pointer from C */
     181             : register unsigned long current_stack_pointer asm("esp") __used;
     182             : 
     183             : /* how to get the thread information struct from C */
     184             : static inline struct thread_info *current_thread_info(void)
     185             : {
     186             :         return (struct thread_info *)
     187             :                 (current_stack_pointer & ~(THREAD_SIZE - 1));
     188             : }
     189             : 
     190             : #else /* !__ASSEMBLY__ */
     191             : 
     192             : /* how to get the thread information struct from ASM */
     193             : #define GET_THREAD_INFO(reg)     \
     194             :         movl $-THREAD_SIZE, reg; \
     195             :         andl %esp, reg
     196             : 
     197             : /* use this one if reg already contains %esp */
     198             : #define GET_THREAD_INFO_WITH_ESP(reg) \
     199             :         andl $-THREAD_SIZE, reg
     200             : 
     201             : #endif
     202             : 
     203             : #else /* X86_32 */
     204             : 
     205             : #include <asm/percpu.h>
     206             : #define KERNEL_STACK_OFFSET (5*8)
     207             : 
     208             : /*
     209             :  * macros/functions for gaining access to the thread information structure
     210             :  * preempt_count needs to be 1 initially, until the scheduler is functional.
     211             :  */
     212             : #ifndef __ASSEMBLY__
     213           1 : DECLARE_PER_CPU(unsigned long, kernel_stack);
     214             : 
     215             : static inline struct thread_info *current_thread_info(void)
     216             : {
     217           3 :         struct thread_info *ti;
     218          27 :         ti = (void *)(percpu_read_stable(kernel_stack) +
     219           3 :                       KERNEL_STACK_OFFSET - THREAD_SIZE);
     220           3 :         return ti;
     221             : }
     222             : 
     223             : #else /* !__ASSEMBLY__ */
     224             : 
     225             : /* how to get the thread information struct from ASM */
     226             : #define GET_THREAD_INFO(reg) \
     227             :         movq PER_CPU_VAR(kernel_stack),reg ; \
     228             :         subq $(THREAD_SIZE-KERNEL_STACK_OFFSET),reg
     229             : 
     230             : #endif
     231             : 
     232             : #endif /* !X86_32 */
     233             : 
     234             : /*
     235             :  * Thread-synchronous status.
     236             :  *
     237             :  * This is different from the flags in that nobody else
     238             :  * ever touches our thread-synchronous status, so we don't
     239             :  * have to worry about atomic accesses.
     240             :  */
     241             : #define TS_USEDFPU              0x0001  /* FPU was used by this task
     242             :                                            this quantum (SMP) */
     243             : #define TS_COMPAT               0x0002  /* 32bit syscall active (64BIT)*/
     244             : #define TS_POLLING              0x0004  /* true if in idle loop
     245             :                                            and not sleeping */
     246             : #define TS_RESTORE_SIGMASK      0x0008  /* restore signal mask in do_signal() */
     247             : #define TS_XSAVE                0x0010  /* Use xsave/xrstor */
     248             : 
     249             : #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
     250             : 
     251             : #ifndef __ASSEMBLY__
     252             : #define HAVE_SET_RESTORE_SIGMASK        1
     253             : static inline void set_restore_sigmask(void)
     254             : {
     255             :         struct thread_info *ti = current_thread_info();
     256             :         ti->status |= TS_RESTORE_SIGMASK;
     257             :         set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags);
     258             : }
     259             : #endif  /* !__ASSEMBLY__ */
     260             : 
     261             : #ifndef __ASSEMBLY__
     262             : extern void arch_task_cache_init(void);
     263             : extern void free_thread_info(struct thread_info *ti);
     264             : extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
     265             : #define arch_task_cache_init arch_task_cache_init
     266             : #endif
     267             : #endif /* _ASM_X86_THREAD_INFO_H */

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