1 #ifndef _ALPHA_THREAD_INFO_H 2 #define _ALPHA_THREAD_INFO_H 3 4 #ifdef __KERNEL__ 5 6 #ifndef __ASSEMBLY__ 7 #include <asm/processor.h> 8 #include <asm/types.h> 9 #include <asm/hwrpb.h> 10 #include <asm/sysinfo.h> 11 #endif 12 13 #ifndef __ASSEMBLY__ 14 struct thread_info { 15 struct pcb_struct pcb; /* palcode state */ 16 17 struct task_struct *task; /* main task structure */ 18 unsigned int flags; /* low level flags */ 19 unsigned int ieee_state; /* see fpu.h */ 20 21 mm_segment_t addr_limit; /* thread address space */ 22 unsigned cpu; /* current CPU */ 23 int preempt_count; /* 0 => preemptable, <0 => BUG */ 24 unsigned int status; /* thread-synchronous flags */ 25 26 int bpt_nsaved; 27 unsigned long bpt_addr[2]; /* breakpoint handling */ 28 unsigned int bpt_insn[2]; 29 }; 30 31 /* 32 * Macros/functions for gaining access to the thread information structure. 33 */ 34 #define INIT_THREAD_INFO(tsk) \ 35 { \ 36 .task = &tsk, \ 37 .addr_limit = KERNEL_DS, \ 38 .preempt_count = INIT_PREEMPT_COUNT, \ 39 } 40 41 #define init_thread_info (init_thread_union.thread_info) 42 #define init_stack (init_thread_union.stack) 43 44 /* How to get the thread information struct from C. */ 45 register struct thread_info *__current_thread_info __asm__("$8"); 46 #define current_thread_info() __current_thread_info 47 48 #endif /* __ASSEMBLY__ */ 49 50 /* Thread information allocation. */ 51 #define THREAD_SIZE_ORDER 1 52 #define THREAD_SIZE (2*PAGE_SIZE) 53 54 /* 55 * Thread information flags: 56 * - these are process state flags and used from assembly 57 * - pending work-to-be-done flags come first and must be assigned to be 58 * within bits 0 to 7 to fit in and immediate operand. 59 * 60 * TIF_SYSCALL_TRACE is known to be 0 via blbs. 61 */ 62 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 63 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 64 #define TIF_SIGPENDING 2 /* signal pending */ 65 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 66 #define TIF_SYSCALL_AUDIT 4 /* syscall audit active */ 67 #define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */ 68 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */ 69 #define TIF_POLLING_NRFLAG 14 /* idle is polling for TIF_NEED_RESCHED */ 70 71 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 72 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 73 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 74 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 75 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 76 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 77 78 /* Work to do on interrupt/exception return. */ 79 #define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 80 _TIF_NOTIFY_RESUME) 81 82 /* Work to do on any return to userspace. */ 83 #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \ 84 | _TIF_SYSCALL_TRACE) 85 86 #define TS_UAC_NOPRINT 0x0001 /* ! Preserve the following three */ 87 #define TS_UAC_NOFIX 0x0002 /* ! flags as they match */ 88 #define TS_UAC_SIGBUS 0x0004 /* ! userspace part of 'osf_sysinfo' */ 89 #define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */ 90 91 #ifndef __ASSEMBLY__ 92 #define HAVE_SET_RESTORE_SIGMASK 1 93 static inline void set_restore_sigmask(void) 94 { 95 struct thread_info *ti = current_thread_info(); 96 ti->status |= TS_RESTORE_SIGMASK; 97 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); 98 } 99 static inline void clear_restore_sigmask(void) 100 { 101 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 102 } 103 static inline bool test_restore_sigmask(void) 104 { 105 return current_thread_info()->status & TS_RESTORE_SIGMASK; 106 } 107 static inline bool test_and_clear_restore_sigmask(void) 108 { 109 struct thread_info *ti = current_thread_info(); 110 if (!(ti->status & TS_RESTORE_SIGMASK)) 111 return false; 112 ti->status &= ~TS_RESTORE_SIGMASK; 113 return true; 114 } 115 #endif 116 117 #define SET_UNALIGN_CTL(task,value) ({ \ 118 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \ 119 if (value & PR_UNALIGN_NOPRINT) \ 120 status |= TS_UAC_NOPRINT; \ 121 if (value & PR_UNALIGN_SIGBUS) \ 122 status |= TS_UAC_SIGBUS; \ 123 if (value & 4) /* alpha-specific */ \ 124 status |= TS_UAC_NOFIX; \ 125 task_thread_info(task)->status = status; \ 126 0; }) 127 128 #define GET_UNALIGN_CTL(task,value) ({ \ 129 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \ 130 __u32 res = 0; \ 131 if (status & TS_UAC_NOPRINT) \ 132 res |= PR_UNALIGN_NOPRINT; \ 133 if (status & TS_UAC_SIGBUS) \ 134 res |= PR_UNALIGN_SIGBUS; \ 135 if (status & TS_UAC_NOFIX) \ 136 res |= 4; \ 137 put_user(res, (int __user *)(value)); \ 138 }) 139 140 #endif /* __KERNEL__ */ 141 #endif /* _ALPHA_THREAD_INFO_H */ 142