我想轉儲流程的內存頁面,一旦它完成執行。我想使用gdb,首先我在exit和_exit處設置斷點,然後在gdb中運行進程,一旦進程中斷,我使用info proc mappings
來獲取進程的內存映射。它看起來像如下:如何轉儲進程的內存頁面?
Mapped address spaces:
Start Addr End Addr Size Offset objfile
0x400000 0x415000 0x15000 0x0 /path/workspace/freqmine
0x614000 0x615000 0x1000 0x14000 /path/workspace/freqmine
0x615000 0x616000 0x1000 0x15000 /path/workspace/freqmine
0x616000 0x129b000 0xc85000 0x0 [heap]
0x7ffff71f4000 0x7ffff720a000 0x16000 0x0 /lib/x86_64-linux-gnu/libgcc_s.so.1
0x7ffff720a000 0x7ffff7409000 0x1ff000 0x16000 /lib/x86_64-linux-gnu/libgcc_s.so.1
0x7ffff7409000 0x7ffff740a000 0x1000 0x15000 /lib/x86_64-linux-gnu/libgcc_s.so.1
0x7ffff740a000 0x7ffff750f000 0x105000 0x0 /lib/x86_64-linux-gnu/libm-2.19.so
0x7ffff750f000 0x7ffff770e000 0x1ff000 0x105000 /lib/x86_64-linux-gnu/libm-2.19.so
0x7ffff770e000 0x7ffff770f000 0x1000 0x104000 /lib/x86_64-linux-gnu/libm-2.19.so
0x7ffff770f000 0x7ffff7710000 0x1000 0x105000 /lib/x86_64-linux-gnu/libm-2.19.so
0x7ffff7710000 0x7ffff78cb000 0x1bb000 0x0 /lib/x86_64-linux-gnu/libc-2.19.so
0x7ffff78cb000 0x7ffff7acb000 0x200000 0x1bb000 /lib/x86_64-linux-gnu/libc-2.19.so
0x7ffff7acb000 0x7ffff7acf000 0x4000 0x1bb000 /lib/x86_64-linux-gnu/libc-2.19.so
0x7ffff7acf000 0x7ffff7ad1000 0x2000 0x1bf000 /lib/x86_64-linux-gnu/libc-2.19.so
0x7ffff7ad1000 0x7ffff7ad6000 0x5000 0x0
0x7ffff7ad6000 0x7ffff7bbc000 0xe6000 0x0 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19
0x7ffff7bbc000 0x7ffff7dbb000 0x1ff000 0xe6000 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19
0x7ffff7dbb000 0x7ffff7dc3000 0x8000 0xe5000 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19
0x7ffff7dc3000 0x7ffff7dc5000 0x2000 0xed000 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19
0x7ffff7dc5000 0x7ffff7dda000 0x15000 0x0
0x7ffff7dda000 0x7ffff7dfd000 0x23000 0x0 /lib/x86_64-linux-gnu/ld-2.19.so
0x7ffff7fce000 0x7ffff7fd3000 0x5000 0x0
0x7ffff7ff7000 0x7ffff7ffa000 0x3000 0x0
0x7ffff7ffa000 0x7ffff7ffc000 0x2000 0x0 [vdso]
0x7ffff7ffc000 0x7ffff7ffd000 0x1000 0x22000 /lib/x86_64-linux-gnu/ld-2.19.so
0x7ffff7ffd000 0x7ffff7ffe000 0x1000 0x23000 /lib/x86_64-linux-gnu/ld-2.19.so
0x7ffff7ffe000 0x7ffff7fff000 0x1000 0x0
0x7ffffffdd000 0x7ffffffff000 0x22000 0x0 [stack]
0xffffffffff600000 0xffffffffff601000 0x1000 0x0 [vsyscall]
現在我有兩個問題,第一:getconf PAGESIZE
在我的機器返回4096
等於0x1000
,一些內存空間的大小不同,但。這怎麼可能?這些空間是內存頁還是邏輯空間?如果這些不是內存頁面,如何查看內存頁面的地址,甚至直接將內存頁面轉儲到文件?
我的第二個問題是:這些地址應該是由程序查看的虛擬地址(不是物理地址),爲什麼程序空間不是從0開始的?如果我嘗試從地址0開始轉儲內存,則會出現以下錯誤:Cannot access memory at address 0x0
。還有爲什麼這些內存空間之間存在一些無法訪問的區域(例如堆之後的區域)?過程的虛擬空間不應該是連續的嗎?