d3a73acbc2
The oi and ni instructions used in entry[64].S to set and clear bits in the thread-flags are not guaranteed to be atomic in regard to other CPUs. Split the TIF bits into CPU, pt_regs and thread-info specific bits. Updates on the TIF bits are done with atomic instructions, updates on CPU and pt_regs bits are done with non-atomic instructions. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/*
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* S390 version
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* Copyright 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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/*
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* Size of kernel stack for each process
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*/
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#ifndef CONFIG_64BIT
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#define THREAD_ORDER 1
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#define ASYNC_ORDER 1
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#else /* CONFIG_64BIT */
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#define THREAD_ORDER 2
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#define ASYNC_ORDER 2
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#endif /* CONFIG_64BIT */
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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 long sys_call_table; /* System call table address */
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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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unsigned int system_call;
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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 0 /* callback before returning to user */
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#define TIF_SIGPENDING 1 /* signal pending */
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#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
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#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
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#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
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#define TIF_SECCOMP 5 /* secure computing */
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#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
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#define TIF_31BIT 16 /* 32bit process */
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#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
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#define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal() */
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#define TIF_SINGLE_STEP 19 /* This task is single stepped */
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#define TIF_BLOCK_STEP 20 /* This task is block stepped */
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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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_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_31BIT (1<<TIF_31BIT)
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#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
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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 /* _ASM_THREAD_INFO_H */
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