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 unsigned long fp[32]; 30 }; 31 32 /* 33 * Macros/functions for gaining access to the thread information structure. 34 */ 35 #define INIT_THREAD_INFO(tsk) \ 36 { \ 37 .task = &tsk, \ 38 .preempt_count = INIT_PREEMPT_COUNT, \ 39 } 40 41 /* How to get the thread information struct from C. */ 42 register struct thread_info *__current_thread_info __asm__("$8"); 43 #define current_thread_info() __current_thread_info 44 45 register unsigned long *current_stack_pointer __asm__ ("$30"); 46 47 #endif /* __ASSEMBLY__ */ 48 49 /* Thread information allocation. */ 50 #define THREAD_SIZE_ORDER 1 51 #define THREAD_SIZE (2*PAGE_SIZE) 52 53 /* 54 * Thread information flags: 55 * - these are process state flags and used from assembly 56 * - pending work-to-be-done flags come first and must be assigned to be 57 * within bits 0 to 7 to fit in and immediate operand. 58 * 59 * TIF_SYSCALL_TRACE is known to be 0 via blbs. 60 */ 61 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 62 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 63 #define TIF_SIGPENDING 2 /* signal pending */ 64 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 65 #define TIF_SYSCALL_AUDIT 4 /* syscall audit active */ 66 #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ 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_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 77 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 78 79 /* Work to do on interrupt/exception return. */ 80 #define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 81 _TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL) 82 83 #define TS_UAC_NOPRINT 0x0001 /* ! Preserve the following three */ 84 #define TS_UAC_NOFIX 0x0002 /* ! flags as they match */ 85 #define TS_UAC_SIGBUS 0x0004 /* ! userspace part of 'osf_sysinfo' */ 86 87 #define TS_SAVED_FP 0x0008 88 #define TS_RESTORE_FP 0x0010 89 90 #define SET_UNALIGN_CTL(task,value) ({ \ 91 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \ 92 if (value & PR_UNALIGN_NOPRINT) \ 93 status |= TS_UAC_NOPRINT; \ 94 if (value & PR_UNALIGN_SIGBUS) \ 95 status |= TS_UAC_SIGBUS; \ 96 if (value & 4) /* alpha-specific */ \ 97 status |= TS_UAC_NOFIX; \ 98 task_thread_info(task)->status = status; \ 99 0; }) 100 101 #define GET_UNALIGN_CTL(task,value) ({ \ 102 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \ 103 __u32 res = 0; \ 104 if (status & TS_UAC_NOPRINT) \ 105 res |= PR_UNALIGN_NOPRINT; \ 106 if (status & TS_UAC_SIGBUS) \ 107 res |= PR_UNALIGN_SIGBUS; \ 108 if (status & TS_UAC_NOFIX) \ 109 res |= 4; \ 110 put_user(res, (int __user *)(value)); \ 111 }) 112 113 #ifndef __ASSEMBLY__ 114 extern void __save_fpu(void); 115 save_fpu(void)116static inline void save_fpu(void) 117 { 118 if (!(current_thread_info()->status & TS_SAVED_FP)) { 119 current_thread_info()->status |= TS_SAVED_FP; 120 __save_fpu(); 121 } 122 } 123 #endif 124 125 #endif /* __KERNEL__ */ 126 #endif /* _ALPHA_THREAD_INFO_H */ 127