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