Star Liu 写道:
I wrote a program to copy the memory content of FFFF0000-FFFFFFFF to a
file, but it says "Segmentation fault", (i use AMD64 lenny, so the
address is long), how could i fix it? thanks!
#include <string.h>
#include <stdio.h>
void CopyMemoryToFile(char* FilePath, long StartAddress, long OffSet)
{
FILE* Memory;
Memory=fopen (FilePath, "w");
if(Memory!=NULL)
{
void* Start;
Start=StartAddress;
fwrite(Start, 1, OffSet, Memory);
}
fclose(Memory);
}
int main (void)
{
CopyMemoryToFile("~/cgi-bin_d/Memory",0xFFFF0000,0xFFFF);
return 0;
}
行了行了，不用讲英文了，你上面说完我就知道你代码要出问题现在一看果然。
Linux引导到内核后就进入虚拟模式，这时候MMC接管了内存访问。你在访问内存的
时候是被映射了的(记不清是GDT,LDT还是什么了,好久前的东西啊..),这时候访问
0xFFFF0000只会报错。
另外,DOS下的内存转换算法是这样.段地址左移8位数学加偏移.你的地址也写错了,
DOS下也通不过的.
--
To UNSUBSCRIBE, email to [EMAIL PROTECTED]
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
