603d1a50ac
The entry to / exit from sie has subtle dependencies to the first level interrupt handler. Move the sie assembler code to entry64.S and replace the SIE_HOOK callback with a test and the new _TIF_SIE bit. In addition this patch fixes several problems in regard to the check for the_TIF_EXIT_SIE bits. The old code checked the TIF bits before executing the interrupt handler and it only modified the instruction address if it pointed directly to the sie instruction. In both cases it could miss a TIF bit that normally would cause an exit from the guest and would reenter the guest context. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
133 lines
4 KiB
C
133 lines
4 KiB
C
/*
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* include/asm-s390/thread_info.h
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*
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* S390 version
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* Copyright (C) IBM Corp. 2002,2006
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#ifndef _ASM_THREAD_INFO_H
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#define _ASM_THREAD_INFO_H
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#ifdef __KERNEL__
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/*
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* Size of kernel stack for each process
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*/
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#ifndef __s390x__
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#define THREAD_ORDER 1
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#define ASYNC_ORDER 1
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#else /* __s390x__ */
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#ifndef __SMALL_STACK
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#define THREAD_ORDER 2
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#define ASYNC_ORDER 2
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#else
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#define THREAD_ORDER 1
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#define ASYNC_ORDER 1
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#endif
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#endif /* __s390x__ */
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#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
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#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
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#ifndef __ASSEMBLY__
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#include <asm/lowcore.h>
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#include <asm/page.h>
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#include <asm/processor.h>
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/*
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* low level task data that entry.S needs immediate access to
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* - this struct should fit entirely inside of one cache line
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* - this struct shares the supervisor stack pages
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* - if the contents of this structure are changed, the assembly constants must also be changed
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*/
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struct thread_info {
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struct task_struct *task; /* main task structure */
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struct exec_domain *exec_domain; /* execution domain */
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unsigned long flags; /* low level flags */
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unsigned int cpu; /* current CPU */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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struct restart_block restart_block;
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__u64 user_timer;
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__u64 system_timer;
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unsigned long last_break; /* last breaking-event-address. */
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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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.exec_domain = &default_exec_domain, \
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.flags = 0, \
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.cpu = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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/* how to get the thread information struct from C */
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static inline struct thread_info *current_thread_info(void)
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{
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return (struct thread_info *) S390_lowcore.thread_info;
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}
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#define THREAD_SIZE_ORDER THREAD_ORDER
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#endif
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/*
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* thread information flags bit numbers
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*/
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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_RESTART_SVC 4 /* restart svc with new svc number */
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#define TIF_PER_TRAP 6 /* deliver sigtrap on return to user */
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#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
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#define TIF_SYSCALL_TRACE 8 /* syscall trace active */
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#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
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#define TIF_SECCOMP 10 /* secure computing */
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#define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
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#define TIF_SIE 12 /* guest execution active */
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#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling
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TIF_NEED_RESCHED */
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#define TIF_31BIT 17 /* 32bit process */
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#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
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#define TIF_RESTORE_SIGMASK 19 /* restore signal mask in do_signal() */
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#define TIF_SINGLE_STEP 20 /* This task is single stepped */
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#define TIF_FREEZE 21 /* thread is freezing for suspend */
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
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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_RESTART_SVC (1<<TIF_RESTART_SVC)
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#define _TIF_PER_TRAP (1<<TIF_PER_TRAP)
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#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
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#define _TIF_SECCOMP (1<<TIF_SECCOMP)
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#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
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#define _TIF_SIE (1<<TIF_SIE)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_31BIT (1<<TIF_31BIT)
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#define _TIF_SINGLE_STEP (1<<TIF_FREEZE)
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#define _TIF_FREEZE (1<<TIF_FREEZE)
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#ifdef CONFIG_64BIT
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#define is_32bit_task() (test_thread_flag(TIF_31BIT))
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#else
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#define is_32bit_task() (1)
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#endif
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#endif /* __KERNEL__ */
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#define PREEMPT_ACTIVE 0x4000000
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#endif /* _ASM_THREAD_INFO_H */
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