600482c13d
On Blackfin systems, the hardware single step exception triggers before
the system call exception, so we need to save this info to process it
later on. Otherwise, single stepping in userspace misses a few insns
right after the system call.
This is based a bit on the SuperH code added in commit 4b505db9c4.
Reported-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/*
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* Copyright 2004-2010 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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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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#include <asm/page.h>
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#include <asm/entry.h>
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#include <asm/l1layout.h>
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#include <linux/compiler.h>
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#ifdef __KERNEL__
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/* Thread Align Mask to reach to the top of the stack
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* for any process
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*/
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#define ALIGN_PAGE_MASK 0xffffe000
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/*
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* Size of kernel stack for each process. This must be a power of 2...
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*/
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE 8192 /* 2 pages */
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#define STACK_WARN (THREAD_SIZE/8)
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#ifndef __ASSEMBLY__
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typedef unsigned long mm_segment_t;
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/*
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* low level task data.
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* If you change this, change the TI_* offsets below to match.
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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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int cpu; /* cpu we're on */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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mm_segment_t addr_limit; /* address limit */
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struct restart_block restart_block;
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#ifndef CONFIG_SMP
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struct l1_scratch_task_info l1_task_info;
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#endif
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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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/* Given a task stack pointer, you can find its corresponding
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* thread_info structure just by masking it to the THREAD_SIZE
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* boundary (currently 8K as you can see above).
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*/
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__attribute_const__
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static inline struct thread_info *current_thread_info(void)
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{
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struct thread_info *ti;
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__asm__("%0 = sp;" : "=da"(ti));
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return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
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}
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#endif /* __ASSEMBLY__ */
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/*
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* Offsets in thread_info structure, used in assembly code
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*/
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#define TI_TASK 0
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#define TI_EXECDOMAIN 4
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#define TI_FLAGS 8
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#define TI_CPU 12
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#define TI_PREEMPT 16
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#define PREEMPT_ACTIVE 0x4000000
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/*
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* thread information flag bit numbers
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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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_POLLING_NRFLAG 3 /* true if poll_idle() is polling
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TIF_NEED_RESCHED */
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#define TIF_MEMDIE 4
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#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
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#define TIF_FREEZE 6 /* is freezing for suspend */
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#define TIF_IRQ_SYNC 7 /* sync pipeline stage */
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#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
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#define TIF_SINGLESTEP 9
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/* as above, but as bit values */
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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_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
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#define _TIF_FREEZE (1<<TIF_FREEZE)
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#define _TIF_IRQ_SYNC (1<<TIF_IRQ_SYNC)
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
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#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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