查找地址属于哪一页 [英] Find which page an address belongs to
问题描述
我可以平凡找出缓冲区的内存中的地址如下： -
I could find out the address of a buffer in memory trivially as follows :-
int main() {
char buffer[100];
printf("%p\n, buffer);
}
有什么办法，我可以打印出缓冲区所属的页面的地址？
Is there any way I could print out the address of the page the buffer belongs to?
我是一个Linux机器上，Ubuntu的非常精确。我很好奇32位和64位版本。
I'm on a Linux machine, Ubuntu to be exact. I'm curious about both 32 and 64 bit versions.
推荐答案
有似乎是由Linux没有提供系统调用，我们可以得到这样的信息。不过，我认为我们可以通过下面的步骤获得的信息（/ proc目录）：
There seems to be no system call provided by the Linux where we can get such information. However I think we can get the information(/proc directory) by following steps:
Get the buffer address assume 0x7fffffffe0b0(attach with gdb so that program would pause)
Execute the command(cat /proc/3586/maps)assume PID = 3586
Execute the command(cat /proc/3586/numa_maps)
现在以下缓冲地址属于下面的[堆栈]段。
Now following buffer address belongs to the [stack] segments below.
mantosh@mantosh4u:/proc/3586$ cat maps
00400000-00401000 r-xp 00000000 08:03 5116562 /home/mantosh/practice/bakwas
00600000-00601000 r--p 00000000 08:03 5116562 /home/mantosh/practice/bakwas
00601000-00602000 rw-p 00001000 08:03 5116562 /home/mantosh/practice/bakwas
7ffff7204000-7ffff72ff000 r-xp 00000000 08:03 23336063 /lib/x86_64-linux-gnu/libm-2.15.so
7ffff72ff000-7ffff74fe000 ---p 000fb000 08:03 23336063 /lib/x86_64-linux-gnu/libm-2.15.so
7ffff74fe000-7ffff74ff000 r--p 000fa000 08:03 23336063 /lib/x86_64-linux-gnu/libm-2.15.so
7ffff74ff000-7ffff7500000 rw-p 000fb000 08:03 23336063 /lib/x86_64-linux-gnu/libm-2.15.so
7ffff7500000-7ffff76b5000 r-xp 00000000 08:03 23334413 /lib/x86_64-linux-gnu/libc-2.15.so
7ffff76b5000-7ffff78b5000 ---p 001b5000 08:03 23334413 /lib/x86_64-linux-gnu/libc-2.15.so
7ffff78b5000-7ffff78b9000 r--p 001b5000 08:03 23334413 /lib/x86_64-linux-gnu/libc-2.15.so
7ffff78b9000-7ffff78bb000 rw-p 001b9000 08:03 23334413 /lib/x86_64-linux-gnu/libc-2.15.so
7ffff78bb000-7ffff78c0000 rw-p 00000000 00:00 0
7ffff78c0000-7ffff78d5000 r-xp 00000000 08:03 23331018 /lib/x86_64-linux-gnu/libgcc_s.so.1
7ffff78d5000-7ffff7ad4000 ---p 00015000 08:03 23331018 /lib/x86_64-linux-gnu/libgcc_s.so.1
7ffff7ad4000-7ffff7ad5000 r--p 00014000 08:03 23331018 /lib/x86_64-linux-gnu/libgcc_s.so.1
7ffff7ad5000-7ffff7ad6000 rw-p 00015000 08:03 23331018 /lib/x86_64-linux-gnu/libgcc_s.so.1
7ffff7ad6000-7ffff7bbc000 r-xp 00000000 08:03 1573341 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.18
7ffff7bbc000-7ffff7dbb000 ---p 000e6000 08:03 1573341 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.18
7ffff7dbb000-7ffff7dc3000 r--p 000e5000 08:03 1573341 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.18
7ffff7dc3000-7ffff7dc5000 rw-p 000ed000 08:03 1573341 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.18
7ffff7dc5000-7ffff7dda000 rw-p 00000000 00:00 0
7ffff7dda000-7ffff7dfc000 r-xp 00000000 08:03 23336064 /lib/x86_64-linux-gnu/ld-2.15.so
7ffff7fd2000-7ffff7fd7000 rw-p 00000000 00:00 0
7ffff7ff8000-7ffff7ffb000 rw-p 00000000 00:00 0
7ffff7ffb000-7ffff7ffc000 r-xp 00000000 00:00 0 [vdso]
7ffff7ffc000-7ffff7ffd000 r--p 00022000 08:03 23336064 /lib/x86_64-linux-gnu/ld-2.15.so
7ffff7ffd000-7ffff7fff000 rw-p 00023000 08:03 23336064 /lib/x86_64-linux-gnu/ld-2.15.so
7ffffffde000-7ffffffff000 rw-p 00000000 00:00 0 [stack]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
我们可以看到最后的命令上面提到的输出（numa_maps）
We can see the output from the last command mention above(numa_maps)
mantosh@mantosh4u:/proc/3586$ cat numa_maps
00400000 default file=/home/mantosh/practice/bakwas anon=1 dirty=1 N0=1
00600000 default file=/home/mantosh/practice/bakwas anon=1 dirty=1 N0=1
00601000 default file=/home/mantosh/practice/bakwas anon=1 dirty=1 N0=1
7ffff7204000 default file=/lib/x86_64-linux-gnu/libm-2.15.so mapped=16 mapmax=52 N0=16
7ffff72ff000 default file=/lib/x86_64-linux-gnu/libm-2.15.so
7ffff74fe000 default file=/lib/x86_64-linux-gnu/libm-2.15.so anon=1 dirty=1 N0=1
7ffff74ff000 default file=/lib/x86_64-linux-gnu/libm-2.15.so anon=1 dirty=1 N0=1
7ffff7500000 default file=/lib/x86_64-linux-gnu/libc-2.15.so anon=1 dirty=1 mapped=63 mapmax=111 N0=63
7ffff76b5000 default file=/lib/x86_64-linux-gnu/libc-2.15.so
7ffff78b5000 default file=/lib/x86_64-linux-gnu/libc-2.15.so anon=4 dirty=4 N0=4
7ffff78b9000 default file=/lib/x86_64-linux-gnu/libc-2.15.so anon=2 dirty=2 N0=2
7ffff78bb000 default anon=3 dirty=3 N0=3
7ffff78c0000 default file=/lib/x86_64-linux-gnu/libgcc_s.so.1 mapped=3 mapmax=22 N0=3
7ffff78d5000 default file=/lib/x86_64-linux-gnu/libgcc_s.so.1
7ffff7ad4000 default file=/lib/x86_64-linux-gnu/libgcc_s.so.1 anon=1 dirty=1 N0=1
7ffff7ad5000 default file=/lib/x86_64-linux-gnu/libgcc_s.so.1 anon=1 dirty=1 N0=1
7ffff7ad6000 default file=/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.18 mapped=90 mapmax=20 N0=90
7ffff7bbc000 default file=/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.18
7ffff7dbb000 default file=/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.18 anon=8 dirty=8 N0=8
7ffff7dc3000 default file=/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.18 anon=2 dirty=2 N0=2
7ffff7dc5000 default anon=3 dirty=3 N0=3
7ffff7dda000 default file=/lib/x86_64-linux-gnu/ld-2.15.so anon=1 dirty=1 mapped=27 mapmax=106 N0=27
7ffff7fd2000 default anon=5 dirty=5 N0=5
7ffff7ff8000 default anon=3 dirty=3 N0=3
7ffff7ffb000 default
7ffff7ffc000 default file=/lib/x86_64-linux-gnu/ld-2.15.so anon=1 dirty=1 N0=1
7ffff7ffd000 default file=/lib/x86_64-linux-gnu/ld-2.15.so anon=2 dirty=2 N0=2
7ffffffdd000 default stack anon=2 dirty=2 N0=2
可以proc和NUMA文档中找到有关每一行条目中的更多详细信息。但是我们的缓冲区属于其中包含有关页面和基地址和其他一些有用信息（如页面的脏状态和全部）信息中的最后一项。希望这可能是有用的。
The more detailed information regarding each line entry can be found in proc and numa documentation. However our buffer belongs to the last entry which contains the information about the page and the base address and some other useful information(like dirty status of page and all). Hope this might be useful.
这篇关于查找地址属于哪一页的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
