linux 内核处理缺页异常函数：do_page_fault ，2.4.0版

最新推荐文章于 2025-03-02 10:01:14 发布

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最新推荐文章于 2025-03-02 10:01:14 发布 · 5.4k 阅读

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#linux #struct #reference #printing #access #exception

该博客主要探讨Linux内核2.4.0版中处理缺页异常的do_page_fault函数。函数根据异常代码和地址区分用户模式与内核模式，并通过find_vma、handle_mm_fault等处理页面错误，确保内核和进程地址空间的正确映射。若无法处理，则触发信号如SIGSEGV或SIGBUS。

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关于内核地址空间如何和进程地址空间合在一起，下面函数能看出来。

/* * This routine handles page faults. It determines the address, * and the problem, and then passes it off to one of the appropriate * routines. * * error_code: * bit 0 == 0 means no page found, 1 means protection fault * bit 1 == 0 means read, 1 means write * bit 2 == 0 means kernel, 1 means user-mode */ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code) { struct task_struct *tsk; struct mm_struct *mm; struct vm_area_struct * vma; unsigned long address; unsigned long page; unsigned long fixup; int write; siginfo_t info; /* get the address */ __asm__("movl %%cr2,%0":"=r" (address)); tsk = current; /* * We fault-in kernel-space virtual memory on-demand. The * 'reference' page table is init_mm.pgd. * * NOTE! We MUST NOT take any