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71 lines
2.7 KiB
C
71 lines
2.7 KiB
C
#include "traceback.h"
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#include <common/printk.h>
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#include <process/process.h>
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static int lookup_kallsyms(uint64_t addr, int level)
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{
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const char *str = (const char *)&kallsyms_names;
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// 暴力查找符合要求的symbol
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// todo: 改用二分搜索。
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// 由于符号表使用nm -n生成，因此是按照地址升序排列的，因此可以二分
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uint64_t index = 0;
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for (index = 0; index < kallsyms_num - 1; ++index)
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{
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if (addr > kallsyms_address[index] && addr <= kallsyms_address[index + 1])
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break;
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}
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if (index < kallsyms_num) // 找到对应的函数
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{
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// 依次输出函数名称、rip离函数起始处的偏移量、函数执行的rip
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printk("function:%s() \t(+) %04d address:%#018lx\n", &str[kallsyms_names_index[index]], addr - kallsyms_address[index], addr);
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return 0;
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}
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else
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return -1;
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}
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/**
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* @brief 追溯内核栈调用情况
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*
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* @param regs 内核栈结构体
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*/
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void traceback(struct pt_regs *regs)
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{
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// 先检验是否为用户态出错，若为用户态出错，则直接返回
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if (verify_area(regs->rbp, 0))
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{
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printk_color(YELLOW, BLACK, "Kernel traceback: Fault in userland. pid=%ld, rbp=%#018lx\n", current_pcb->pid, regs->rbp);
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return;
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}
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uint64_t *rbp = (uint64_t *)regs->rbp;
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printk_color(YELLOW, BLACK, "======== Kernel traceback =======\n");
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// printk("&kallsyms_address:%#018lx,kallsyms_address:%#018lx\n", &kallsyms_address, kallsyms_address);
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// printk("&kallsyms_syms_num:%#018lx,kallsyms_syms_num:%d\n", &kallsyms_num, kallsyms_num);
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// printk("&kallsyms_index:%#018lx\n", &kallsyms_names_index);
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// printk("&kallsyms_names:%#018lx,kallsyms_names:%s\n", &kallsyms_names, &kallsyms_names);
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uint64_t ret_addr = regs->rip;
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// 最大追踪10层调用栈
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for (int i = 0; i < 10; ++i)
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{
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if (lookup_kallsyms(ret_addr, i) != 0)
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break;
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// 当前栈帧的rbp的地址大于等于内核栈的rbp的时候，表明调用栈已经到头了，追踪结束。
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// 当前rbp的地址为用户空间时，直接退出
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if((uint64_t)(rbp) >= current_pcb->thread->rbp || ((uint64_t)rbp<regs->rsp))
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break;
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printk_color(ORANGE, BLACK, "rbp:%#018lx,*rbp:%#018lx\n", rbp, *rbp);
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// 由于x86处理器在执行call指令时，先将调用返回地址压入栈中，然后再把函数的rbp入栈，最后将rsp设为新的rbp。
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// 因此，此处的rbp就是上一层的rsp，那么，*(rbp+1)得到的就是上一层函数的返回地址
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ret_addr = *(rbp + 1);
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rbp = (uint64_t *)(*rbp);
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printk("\n");
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}
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printk_color(YELLOW, BLACK, "======== Kernel traceback end =======\n");
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} |