3be80aaef8
* L1_CACHE_SHIFT * PAGE_SIZE, PAGE_OFFSET * struct pt_regs, struct user_regs_struct * struct thread_struct, cpu_relax(), task_pt_regs(), start_thread(), ... * struct thread_info, THREAD_SIZE, INIT_THREAD_INFO(), TIF_*, ... * BUG() * ELF_* * Elf_* To disallow user-space visibility into some of the core kernel data-types such as struct pt_regs, #ifdef __KERNEL__ which also makes the UAPI header spit (further patch in the series) to NOT export it to asm/uapi/ptrace.h Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Jonas Bonn <jonas.bonn@gmail.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Acked-by: Arnd Bergmann <arnd@arndb.de>
121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Vineetg: Oct 2009
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* No need for ARC specific thread_info allocator (kmalloc/free). This is
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* anyways one page allocation, thus slab alloc can be short-circuited and
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* the generic version (get_free_page) would be loads better.
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*
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* Sameer Dhavale: Codito Technologies 2004
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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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#include <asm/page.h>
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#ifdef CONFIG_16KSTACKS
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#define THREAD_SIZE_ORDER 1
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#else
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#define THREAD_SIZE_ORDER 0
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#endif
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
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#ifndef __ASSEMBLY__
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#include <linux/thread_info.h>
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#include <asm/segment.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
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* must also be changed
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*/
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struct thread_info {
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unsigned long flags; /* low level flags */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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struct task_struct *task; /* main task structure */
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mm_segment_t addr_limit; /* thread address space */
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struct exec_domain *exec_domain;/* execution domain */
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__u32 cpu; /* current CPU */
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unsigned long thr_ptr; /* TLS ptr */
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struct restart_block restart_block;
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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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* preempt_count needs to be 1 initially, until the scheduler is functional.
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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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.addr_limit = KERNEL_DS, \
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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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static inline __attribute_const__ struct thread_info *current_thread_info(void)
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{
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register unsigned long sp asm("sp");
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return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
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}
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#endif /* !__ASSEMBLY__ */
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#define PREEMPT_ACTIVE 0x10000000
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/*
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* thread information flags
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* - these are process state flags that various assembly files may need to
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* access
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* - pending work-to-be-done flags are in LSW
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* - other flags in MSW
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*/
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#define TIF_RESTORE_SIGMASK 0 /* restore sig mask in do_signal() */
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#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
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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 auditing active */
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#define TIF_SYSCALL_TRACE 15 /* syscall trace active */
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/* true if poll_idle() is polling TIF_NEED_RESCHED */
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#define TIF_MEMDIE 16
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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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_AUDIT (1<<TIF_SYSCALL_AUDIT)
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#define _TIF_MEMDIE (1<<TIF_MEMDIE)
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/* work to do on interrupt/exception return */
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#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
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_TIF_NOTIFY_RESUME)
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/*
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* _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it.
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* SYSCALL_TRACE is anways seperately/unconditionally tested right after a
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* syscall, so all that reamins to be tested is _TIF_WORK_MASK
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*/
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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