1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ALPHA_THREAD_INFO_H 3 #define _ALPHA_THREAD_INFO_H 4 5 #ifdef __KERNEL__ 6 7 #ifndef __ASSEMBLY__ 8 #include <asm/processor.h> 9 #include <asm/types.h> 10 #include <asm/hwrpb.h> 11 #include <asm/sysinfo.h> 12 #endif 13 14 #ifndef __ASSEMBLY__ 15 struct thread_info { 16 struct pcb_struct pcb; /* palcode state */ 17 18 struct task_struct *task; /* main task structure */ 19 unsigned int flags; /* low level flags */ 20 unsigned int ieee_state; /* see fpu.h */ 21 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 .preempt_count = INIT_PREEMPT_COUNT, \ 38 } 39 40 /* How to get the thread information struct from C. */ 41 register struct thread_info *__current_thread_info __asm__("$8"); 42 #define current_thread_info() __current_thread_info 43 44 #endif /* __ASSEMBLY__ */ 45 46 /* Thread information allocation. */ 47 #define THREAD_SIZE_ORDER 1 48 #define THREAD_SIZE (2*PAGE_SIZE) 49 50 /* 51 * Thread information flags: 52 * - these are process state flags and used from assembly 53 * - pending work-to-be-done flags come first and must be assigned to be 54 * within bits 0 to 7 to fit in and immediate operand. 55 * 56 * TIF_SYSCALL_TRACE is known to be 0 via blbs. 57 */ 58 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 59 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 60 #define TIF_SIGPENDING 2 /* signal pending */ 61 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 62 #define TIF_SYSCALL_AUDIT 4 /* syscall audit active */ 63 #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ 64 #define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */ 65 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */ 66 #define TIF_POLLING_NRFLAG 14 /* idle is polling for TIF_NEED_RESCHED */ 67 68 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 69 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 70 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 71 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 72 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 73 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 74 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 75 76 /* Work to do on interrupt/exception return. */ 77 #define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 78 _TIF_NOTIFY_RESUME) 79 80 /* Work to do on any return to userspace. */ 81 #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \ 82 | _TIF_SYSCALL_TRACE) 83 84 #define TS_UAC_NOPRINT 0x0001 /* ! Preserve the following three */ 85 #define TS_UAC_NOFIX 0x0002 /* ! flags as they match */ 86 #define TS_UAC_SIGBUS 0x0004 /* ! userspace part of 'osf_sysinfo' */ 87 88 #define SET_UNALIGN_CTL(task,value) ({ \ 89 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \ 90 if (value & PR_UNALIGN_NOPRINT) \ 91 status |= TS_UAC_NOPRINT; \ 92 if (value & PR_UNALIGN_SIGBUS) \ 93 status |= TS_UAC_SIGBUS; \ 94 if (value & 4) /* alpha-specific */ \ 95 status |= TS_UAC_NOFIX; \ 96 task_thread_info(task)->status = status; \ 97 0; }) 98 99 #define GET_UNALIGN_CTL(task,value) ({ \ 100 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \ 101 __u32 res = 0; \ 102 if (status & TS_UAC_NOPRINT) \ 103 res |= PR_UNALIGN_NOPRINT; \ 104 if (status & TS_UAC_SIGBUS) \ 105 res |= PR_UNALIGN_SIGBUS; \ 106 if (status & TS_UAC_NOFIX) \ 107 res |= 4; \ 108 put_user(res, (int __user *)(value)); \ 109 }) 110 111 #endif /* __KERNEL__ */ 112 #endif /* _ALPHA_THREAD_INFO_H */ 113