linux-2.6.33/do_page_fault()(arm)
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開始行:
*参照元 [#g449679e]
#backlinks
*説明 [#ae9ab168]
-パス: [[linux-2.6.33/arch/arm/mm/fault.c]]
-FIXME: これは何？
--説明
**引数 [#c2583795]
-unsigned long addr
--
-unsigned int fsr
--
-struct pt_regs *regs
--
--[[linux-2.6.33/pt_regs]]
**返り値 [#o19a714e]
-int
--
**参考 [#yae53746]
*実装 [#q5f130b9]
**MMU 有効の場合 [#rdd25210]
#ifdef CONFIG_MMU
（略）
static int __kprobes
do_page_fault(unsigned long addr, unsigned int fsr, stru...
{
struct task_struct *tsk;
struct mm_struct *mm;
int fault, sig, code;
-
--[[linux-2.6.33/task_struct]]
-
--[[linux-2.6.33/mm_struct]]
if (notify_page_fault(regs, fsr))
return 0;
-
--[[linux-2.6.33/notify_page_fault()]]
tsk = current;
mm = tsk->mm;
-
--[[linux-2.6.33/current(global)]]
/*
* If we're in an interrupt or have no user
* context, we must not take the fault..
*/
if (in_atomic() || !mm)
goto no_context;
-
--[[linux-2.6.33/in_atomic()]]
/*
* As per x86, we may deadlock here. However, since th...
* validly references user space from well defined area...
* we can bug out early if this is from code which shou...
*/
if (!down_read_trylock(&mm->mmap_sem)) {
if (!user_mode(regs) && !search_exception_tables(regs-...
goto no_context;
down_read(&mm->mmap_sem);
-
--[[linux-2.6.33/down_read_trylock()]]
-
--[[linux-2.6.33/user_mode()]]
-
--[[linux-2.6.33/search_exception_tables()]]
-
--[[linux-2.6.33/down_read()]]
} else {
/*
* The above down_read_trylock() might have succeeded in
* which case, we'll have missed the might_sleep() from
* down_read()
*/
might_sleep();
-
--[[linux-2.6.33/might_sleep()]]
#ifdef CONFIG_DEBUG_VM
-
--[[linux-2.6.33/CONFIG_DEBUG_VM]]
if (!user_mode(regs) &&
!search_exception_tables(regs->ARM_pc))
goto no_context;
#endif
}
fault = __do_page_fault(mm, addr, fsr, tsk);
up_read(&mm->mmap_sem);
-
--[[linux-2.6.33/__do_page_fault()]]
-
--[[linux-2.6.33/up_read()]]
/*
* Handle the "normal" case first - VM_FAULT_MAJOR / VM...
*/
if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP ...
return 0;
-
--[[linux-2.6.33/likely()]]
-
--[[linux-2.6.33/VM_FAULT_ERROR]]
-
--[[linux-2.6.33/VM_FAULT_BADMAP]]
-
--[[linux-2.6.33/VM_FAULT_BADACCESS]]
if (fault & VM_FAULT_OOM) {
/*
* We ran out of memory, call the OOM killer, and retu...
* userspace (which will retry the fault, or kill us i...
* got oom-killed)
*/
pagefault_out_of_memory();
return 0;
-
--[[linux-2.6.33/VM_FAULT_OOM]]
-
--[[linux-2.6.33/pagefault_out_of_memory()]]
}
/*
* If we are in kernel mode at this point, we
* have no context to handle this fault with.
*/
if (!user_mode(regs))
goto no_context;
if (fault & VM_FAULT_SIGBUS) {
-
--[[linux-2.6.33/VM_FAULT_SIGBUS]]
/*
* We had some memory, but were unable to
* successfully fix up this page fault.
*/
sig = SIGBUS;
code = BUS_ADRERR;
-
--[[linux-2.6.33/SIGBUS]]
-
--[[linux-2.6.33/BUS_ADRERR]]
} else {
/*
* Something tried to access memory that
* isn't in our memory map..
*/
sig = SIGSEGV;
code = fault == VM_FAULT_BADACCESS ?
SEGV_ACCERR : SEGV_MAPERR;
-
--[[linux-2.6.33/SIGSEGV]]
-
--[[linux-2.6.33/VM_FAULT_BADACCESS]]
-
--[[linux-2.6.33/SEGV_ACCERR]]
-
--[[linux-2.6.33/SEGV_MAPERR]]
}
__do_user_fault(tsk, addr, fsr, sig, code, regs);
return 0;
-
--[[linux-2.6.33/__do_user_fault()]]
no_context:
__do_kernel_fault(mm, addr, fsr, regs);
return 0;
-
--[[linux-2.6.33/__do_kernel_fault()]]
}
**MMU 無効の場合 [#r0559ef1]
#else /* CONFIG_MMU */
static int
do_page_fault(unsigned long addr, unsigned int fsr, stru...
{
return 0;
-何もせず成功を返す。
}
#endif /* CONFIG_MMU */
*コメント [#q7fd1e55]
終了行:
*参照元 [#g449679e]
#backlinks
*説明 [#ae9ab168]
-パス: [[linux-2.6.33/arch/arm/mm/fault.c]]
-FIXME: これは何？
--説明
**引数 [#c2583795]
-unsigned long addr
--
-unsigned int fsr
--
-struct pt_regs *regs
--
--[[linux-2.6.33/pt_regs]]
**返り値 [#o19a714e]
-int
--
**参考 [#yae53746]
*実装 [#q5f130b9]
**MMU 有効の場合 [#rdd25210]
#ifdef CONFIG_MMU
（略）
static int __kprobes
do_page_fault(unsigned long addr, unsigned int fsr, stru...
{
struct task_struct *tsk;
struct mm_struct *mm;
int fault, sig, code;
-
--[[linux-2.6.33/task_struct]]
-
--[[linux-2.6.33/mm_struct]]
if (notify_page_fault(regs, fsr))
return 0;
-
--[[linux-2.6.33/notify_page_fault()]]
tsk = current;
mm = tsk->mm;
-
--[[linux-2.6.33/current(global)]]
/*
* If we're in an interrupt or have no user
* context, we must not take the fault..
*/
if (in_atomic() || !mm)
goto no_context;
-
--[[linux-2.6.33/in_atomic()]]
/*
* As per x86, we may deadlock here. However, since th...
* validly references user space from well defined area...
* we can bug out early if this is from code which shou...
*/
if (!down_read_trylock(&mm->mmap_sem)) {
if (!user_mode(regs) && !search_exception_tables(regs-...
goto no_context;
down_read(&mm->mmap_sem);
-
--[[linux-2.6.33/down_read_trylock()]]
-
--[[linux-2.6.33/user_mode()]]
-
--[[linux-2.6.33/search_exception_tables()]]
-
--[[linux-2.6.33/down_read()]]
} else {
/*
* The above down_read_trylock() might have succeeded in
* which case, we'll have missed the might_sleep() from
* down_read()
*/
might_sleep();
-
--[[linux-2.6.33/might_sleep()]]
#ifdef CONFIG_DEBUG_VM
-
--[[linux-2.6.33/CONFIG_DEBUG_VM]]
if (!user_mode(regs) &&
!search_exception_tables(regs->ARM_pc))
goto no_context;
#endif
}
fault = __do_page_fault(mm, addr, fsr, tsk);
up_read(&mm->mmap_sem);
-
--[[linux-2.6.33/__do_page_fault()]]
-
--[[linux-2.6.33/up_read()]]
/*
* Handle the "normal" case first - VM_FAULT_MAJOR / VM...
*/
if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP ...
return 0;
-
--[[linux-2.6.33/likely()]]
-
--[[linux-2.6.33/VM_FAULT_ERROR]]
-
--[[linux-2.6.33/VM_FAULT_BADMAP]]
-
--[[linux-2.6.33/VM_FAULT_BADACCESS]]
if (fault & VM_FAULT_OOM) {
/*
* We ran out of memory, call the OOM killer, and retu...
* userspace (which will retry the fault, or kill us i...
* got oom-killed)
*/
pagefault_out_of_memory();
return 0;
-
--[[linux-2.6.33/VM_FAULT_OOM]]
-
--[[linux-2.6.33/pagefault_out_of_memory()]]
}
/*
* If we are in kernel mode at this point, we
* have no context to handle this fault with.
*/
if (!user_mode(regs))
goto no_context;
if (fault & VM_FAULT_SIGBUS) {
-
--[[linux-2.6.33/VM_FAULT_SIGBUS]]
/*
* We had some memory, but were unable to
* successfully fix up this page fault.
*/
sig = SIGBUS;
code = BUS_ADRERR;
-
--[[linux-2.6.33/SIGBUS]]
-
--[[linux-2.6.33/BUS_ADRERR]]
} else {
/*
* Something tried to access memory that
* isn't in our memory map..
*/
sig = SIGSEGV;
code = fault == VM_FAULT_BADACCESS ?
SEGV_ACCERR : SEGV_MAPERR;
-
--[[linux-2.6.33/SIGSEGV]]
-
--[[linux-2.6.33/VM_FAULT_BADACCESS]]
-
--[[linux-2.6.33/SEGV_ACCERR]]
-
--[[linux-2.6.33/SEGV_MAPERR]]
}
__do_user_fault(tsk, addr, fsr, sig, code, regs);
return 0;
-
--[[linux-2.6.33/__do_user_fault()]]
no_context:
__do_kernel_fault(mm, addr, fsr, regs);
return 0;
-
--[[linux-2.6.33/__do_kernel_fault()]]
}
**MMU 無効の場合 [#r0559ef1]
#else /* CONFIG_MMU */
static int
do_page_fault(unsigned long addr, unsigned int fsr, stru...
{
return 0;
-何もせず成功を返す。
}
#endif /* CONFIG_MMU */
*コメント [#q7fd1e55]
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