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 struct exec_domain *exec_domain; /* execution domain */ 22 mm_segment_t addr_limit; /* thread address space */ 23 unsigned cpu; /* current CPU */ 24 int preempt_count; /* 0 => preemptable, <0 => BUG */ 25 unsigned int status; /* thread-synchronous flags */ 26 27 int bpt_nsaved; 28 unsigned long bpt_addr[2]; /* breakpoint handling */ 29 unsigned int bpt_insn[2]; 30 31 struct restart_block restart_block; 32 }; 33 34 /* 35 * Macros/functions for gaining access to the thread information structure. 36 */ 37 #define INIT_THREAD_INFO(tsk) \ 38 { \ 39 .task = &tsk, \ 40 .exec_domain = &default_exec_domain, \ 41 .addr_limit = KERNEL_DS, \ 42 .preempt_count = INIT_PREEMPT_COUNT, \ 43 .restart_block = { \ 44 .fn = do_no_restart_syscall, \ 45 }, \ 46 } 47 48 #define init_thread_info (init_thread_union.thread_info) 49 #define init_stack (init_thread_union.stack) 50 51 /* How to get the thread information struct from C. */ 52 register struct thread_info *__current_thread_info __asm__("$8"); 53 #define current_thread_info() __current_thread_info 54 55 #endif /* __ASSEMBLY__ */ 56 57 /* Thread information allocation. */ 58 #define THREAD_SIZE_ORDER 1 59 #define THREAD_SIZE (2*PAGE_SIZE) 60 61 /* 62 * Thread information flags: 63 * - these are process state flags and used from assembly 64 * - pending work-to-be-done flags come first and must be assigned to be 65 * within bits 0 to 7 to fit in and immediate operand. 66 * 67 * TIF_SYSCALL_TRACE is known to be 0 via blbs. 68 */ 69 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 70 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 71 #define TIF_SIGPENDING 2 /* signal pending */ 72 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 73 #define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */ 74 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */ 75 76 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 77 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 78 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 79 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 80 81 /* Work to do on interrupt/exception return. */ 82 #define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 83 _TIF_NOTIFY_RESUME) 84 85 /* Work to do on any return to userspace. */ 86 #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \ 87 | _TIF_SYSCALL_TRACE) 88 89 #define TS_UAC_NOPRINT 0x0001 /* ! Preserve the following three */ 90 #define TS_UAC_NOFIX 0x0002 /* ! flags as they match */ 91 #define TS_UAC_SIGBUS 0x0004 /* ! userspace part of 'osf_sysinfo' */ 92 #define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */ 93 #define TS_POLLING 0x0010 /* idle task polling need_resched, 94 skip sending interrupt */ 95 96 #ifndef __ASSEMBLY__ 97 #define HAVE_SET_RESTORE_SIGMASK 1 98 static inline void set_restore_sigmask(void) 99 { 100 struct thread_info *ti = current_thread_info(); 101 ti->status |= TS_RESTORE_SIGMASK; 102 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); 103 } 104 static inline void clear_restore_sigmask(void) 105 { 106 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 107 } 108 static inline bool test_restore_sigmask(void) 109 { 110 return current_thread_info()->status & TS_RESTORE_SIGMASK; 111 } 112 static inline bool test_and_clear_restore_sigmask(void) 113 { 114 struct thread_info *ti = current_thread_info(); 115 if (!(ti->status & TS_RESTORE_SIGMASK)) 116 return false; 117 ti->status &= ~TS_RESTORE_SIGMASK; 118 return true; 119 } 120 #endif 121 122 #define SET_UNALIGN_CTL(task,value) ({ \ 123 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \ 124 if (value & PR_UNALIGN_NOPRINT) \ 125 status |= TS_UAC_NOPRINT; \ 126 if (value & PR_UNALIGN_SIGBUS) \ 127 status |= TS_UAC_SIGBUS; \ 128 if (value & 4) /* alpha-specific */ \ 129 status |= TS_UAC_NOFIX; \ 130 task_thread_info(task)->status = status; \ 131 0; }) 132 133 #define GET_UNALIGN_CTL(task,value) ({ \ 134 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \ 135 __u32 res = 0; \ 136 if (status & TS_UAC_NOPRINT) \ 137 res |= PR_UNALIGN_NOPRINT; \ 138 if (status & TS_UAC_SIGBUS) \ 139 res |= PR_UNALIGN_SIGBUS; \ 140 if (status & TS_UAC_NOFIX) \ 141 res |= 4; \ 142 put_user(res, (int __user *)(value)); \ 143 }) 144 145 #endif /* __KERNEL__ */ 146 #endif /* _ALPHA_THREAD_INFO_H */ 147