激活所有代码段的小程序

Linux系统开启MMU后，应用程序的所有页面并不是一口气加载进来，而是遇到访问未映射的线性地址时，通过触发PageFault触发从

对应的二进制文件加载指定位置的内容到页面。这不便于对应用程序进行分析，故写此代码激活应用程序指定范围内的线性地址。

#include <sys/ptrace.h>

#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>

#define ARG_COUNT 4

int main(int iArgc, char* ppchArgv[])
{
    int iPid = 0;
    unsigned long ulStartAddr = 0;
    unsigned long ulEndAddr = 0;
    unsigned long ulTmp = 0;
    unsigned long i = 0;
    unsigned long ulCurValue = 0;


    if (ARG_COUNT != iArgc)
    {
        printf("Usage: ./try1 pid startAddr endAddr\n");
        return 0;
    }
    
    iPid = atoi(ppchArgv[1]);
    ulStartAddr = strtoul(ppchArgv[2], NULL, 10);
    ulEndAddr = strtoul(ppchArgv[3], NULL, 10);    
    if (ulStartAddr > ulEndAddr)
    {
        ulTmp = ulStartAddr;
        ulStartAddr = ulEndAddr;
        ulEndAddr = ulTmp;
    }
 
    printf("Pid:%d,StartAddr:%lu,EndAddr:%lu\n",
           iPid, ulStartAddr, ulEndAddr);


    errno = 0; 
    ptrace(PTRACE_ATTACH, iPid, NULL, NULL);
    if (0 != errno)
    {
        printf("Attach %d Failed,errno:%d\n", iPid, errno);
        return 0;
    }
    wait(NULL);


    for (i = ulStartAddr; i <= ulEndAddr; i += sizeof(unsigned long))
    {
        errno = 0;
        ulCurValue = ptrace(PTRACE_PEEKDATA, iPid, i, NULL);
        if (0 != errno)
        {
            continue;
        }


        printf("%08X ", ulCurValue);
    } 
    printf("\n");


    errno = 0;
    ptrace(PTRACE_DETACH, iPid, NULL, NULL);
    if (0 != errno)
    {
        printf("Detach %d Failed,errno:%d\n", iPid, errno);
        return 0; 
    }


    return 0;
}