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114 lines
3.6 KiB
114 lines
3.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ALPHA_THREAD_INFO_H |
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#define _ALPHA_THREAD_INFO_H |
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#ifdef __KERNEL__ |
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#ifndef __ASSEMBLY__ |
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#include <asm/processor.h> |
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#include <asm/types.h> |
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#include <asm/hwrpb.h> |
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#include <asm/sysinfo.h> |
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#endif |
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#ifndef __ASSEMBLY__ |
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struct thread_info { |
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struct pcb_struct pcb; /* palcode state */ |
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struct task_struct *task; /* main task structure */ |
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unsigned int flags; /* low level flags */ |
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unsigned int ieee_state; /* see fpu.h */ |
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mm_segment_t addr_limit; /* thread address space */ |
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unsigned cpu; /* current CPU */ |
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int preempt_count; /* 0 => preemptable, <0 => BUG */ |
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unsigned int status; /* thread-synchronous flags */ |
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int bpt_nsaved; |
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unsigned long bpt_addr[2]; /* breakpoint handling */ |
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unsigned int bpt_insn[2]; |
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}; |
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/* |
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* Macros/functions for gaining access to the thread information structure. |
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*/ |
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#define INIT_THREAD_INFO(tsk) \ |
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{ \ |
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.task = &tsk, \ |
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.addr_limit = KERNEL_DS, \ |
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.preempt_count = INIT_PREEMPT_COUNT, \ |
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} |
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/* How to get the thread information struct from C. */ |
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register struct thread_info *__current_thread_info __asm__("$8"); |
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#define current_thread_info() __current_thread_info |
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#endif /* __ASSEMBLY__ */ |
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/* Thread information allocation. */ |
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#define THREAD_SIZE_ORDER 1 |
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#define THREAD_SIZE (2*PAGE_SIZE) |
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/* |
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* Thread information flags: |
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* - these are process state flags and used from assembly |
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* - pending work-to-be-done flags come first and must be assigned to be |
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* within bits 0 to 7 to fit in and immediate operand. |
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* |
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* TIF_SYSCALL_TRACE is known to be 0 via blbs. |
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*/ |
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ |
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#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ |
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#define TIF_SIGPENDING 2 /* signal pending */ |
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ |
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#define TIF_SYSCALL_AUDIT 4 /* syscall audit active */ |
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#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ |
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#define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */ |
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#define TIF_MEMDIE 13 /* is terminating due to OOM killer */ |
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#define TIF_POLLING_NRFLAG 14 /* idle is polling for TIF_NEED_RESCHED */ |
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
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#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
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#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) |
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
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#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
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#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) |
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) |
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/* Work to do on interrupt/exception return. */ |
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#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ |
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_TIF_NOTIFY_RESUME) |
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/* Work to do on any return to userspace. */ |
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#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \ |
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| _TIF_SYSCALL_TRACE) |
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#define TS_UAC_NOPRINT 0x0001 /* ! Preserve the following three */ |
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#define TS_UAC_NOFIX 0x0002 /* ! flags as they match */ |
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#define TS_UAC_SIGBUS 0x0004 /* ! userspace part of 'osf_sysinfo' */ |
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#define SET_UNALIGN_CTL(task,value) ({ \ |
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__u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \ |
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if (value & PR_UNALIGN_NOPRINT) \ |
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status |= TS_UAC_NOPRINT; \ |
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if (value & PR_UNALIGN_SIGBUS) \ |
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status |= TS_UAC_SIGBUS; \ |
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if (value & 4) /* alpha-specific */ \ |
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status |= TS_UAC_NOFIX; \ |
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task_thread_info(task)->status = status; \ |
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0; }) |
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#define GET_UNALIGN_CTL(task,value) ({ \ |
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__u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \ |
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__u32 res = 0; \ |
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if (status & TS_UAC_NOPRINT) \ |
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res |= PR_UNALIGN_NOPRINT; \ |
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if (status & TS_UAC_SIGBUS) \ |
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res |= PR_UNALIGN_SIGBUS; \ |
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if (status & TS_UAC_NOFIX) \ |
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res |= 4; \ |
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put_user(res, (int __user *)(value)); \ |
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}) |
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#endif /* __KERNEL__ */ |
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#endif /* _ALPHA_THREAD_INFO_H */
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