313ce674d3
This support is required for CONFIG_KEYS, NFSv4 kernel DNS, etc. The change is slightly more complex than the minimal thing, since I took advantage of having to go into the assembly code to just move a bunch of stuff into C code: specifically, the schedule(), do_async_page_fault(), do_signal(), and single_step_once() support, in addition to the TIF_NOTIFY_RESUME support. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
170 lines
5.4 KiB
C
170 lines
5.4 KiB
C
/*
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* Copyright (C) 2002 David Howells (dhowells@redhat.com)
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_THREAD_INFO_H
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#define _ASM_TILE_THREAD_INFO_H
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#include <asm/processor.h>
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#include <asm/page.h>
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#ifndef __ASSEMBLY__
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/*
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* Low level task data that assembly code needs immediate access to.
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* The structure is placed at the bottom of the supervisor stack.
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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 status; /* thread-synchronous flags */
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__u32 homecache_cpu; /* CPU we are homecached on */
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__u32 cpu; /* current CPU */
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int preempt_count; /* 0 => preemptable,
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<0 => BUG */
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mm_segment_t addr_limit; /* thread address space
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(KERNEL_DS or USER_DS) */
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struct restart_block restart_block;
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struct single_step_state *step_state; /* single step state
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(if non-zero) */
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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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.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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.step_state = NULL, \
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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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#endif /* !__ASSEMBLY__ */
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#if PAGE_SIZE < 8192
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#define THREAD_SIZE_ORDER (13 - PAGE_SHIFT)
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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_PAGES (1 << THREAD_SIZE_ORDER)
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
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#define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER)
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#define STACK_WARN (THREAD_SIZE/8)
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#ifndef __ASSEMBLY__
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/* How to get the thread information struct from C. */
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register unsigned long stack_pointer __asm__("sp");
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#define current_thread_info() \
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((struct thread_info *)(stack_pointer & -THREAD_SIZE))
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#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
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extern struct thread_info *alloc_thread_info_node(struct task_struct *task, int node);
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extern void free_thread_info(struct thread_info *info);
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/* Sit on a nap instruction until interrupted. */
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extern void smp_nap(void);
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/* Enable interrupts racelessly and nap forever: helper for cpu_idle(). */
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extern void _cpu_idle(void);
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/* Switch boot idle thread to a freshly-allocated stack and free old stack. */
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extern void cpu_idle_on_new_stack(struct thread_info *old_ti,
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unsigned long new_sp,
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unsigned long new_ss10);
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#else /* __ASSEMBLY__ */
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/* how to get the thread information struct from ASM */
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#ifdef __tilegx__
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#define GET_THREAD_INFO(reg) move reg, sp; mm reg, zero, LOG2_THREAD_SIZE, 63
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#else
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#define GET_THREAD_INFO(reg) mm reg, sp, zero, LOG2_THREAD_SIZE, 31
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#endif
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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 that various assembly files may need to access.
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* Keep flags accessed frequently in low bits, particular since it makes
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* it easier to build constants in assembly.
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*/
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#define TIF_SIGPENDING 0 /* signal pending */
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#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
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#define TIF_SINGLESTEP 2 /* restore singlestep on return to
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user mode */
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#define TIF_ASYNC_TLB 3 /* got an async TLB fault in kernel */
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#define TIF_SYSCALL_TRACE 4 /* syscall trace active */
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#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
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#define TIF_SECCOMP 6 /* secure computing */
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#define TIF_MEMDIE 7 /* OOM killer at work */
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#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
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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_SINGLESTEP (1<<TIF_SINGLESTEP)
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#define _TIF_ASYNC_TLB (1<<TIF_ASYNC_TLB)
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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_MEMDIE (1<<TIF_MEMDIE)
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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/* Work to do on any return to user space. */
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#define _TIF_ALLWORK_MASK \
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(_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SINGLESTEP|\
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_TIF_ASYNC_TLB|_TIF_NOTIFY_RESUME)
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/*
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* Thread-synchronous status.
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*
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* This is different from the flags in that nobody else
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* ever touches our thread-synchronous status, so we don't
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* have to worry about atomic accesses.
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*/
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#ifdef __tilegx__
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#define TS_COMPAT 0x0001 /* 32-bit compatibility mode */
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#endif
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#define TS_POLLING 0x0004 /* in idle loop but not sleeping */
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#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal */
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#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
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#ifndef __ASSEMBLY__
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#define HAVE_SET_RESTORE_SIGMASK 1
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static inline void set_restore_sigmask(void)
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{
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struct thread_info *ti = current_thread_info();
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ti->status |= TS_RESTORE_SIGMASK;
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set_bit(TIF_SIGPENDING, &ti->flags);
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_TILE_THREAD_INFO_H */
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