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Index > Linux > sys_brk usage

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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
from docs:
Quote:
ebx=Virtual address of the new .bss top. It should be between the current .bss top and current stack bottom minus 16384 bytes.
0 value may be used to obtain current top address of .bss section.


how to find stack bottom?
Post 24 Jan 2007, 22:55
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Nikolay Petrov



Joined: 22 Apr 2004
Posts: 101
Location: Bulgaria
Nikolay Petrov
I know that you knows Wink

Program Virtual Memory Area
------------------------------------- 0xbfffffff
Stack Data (argc, argv, env)
-------------------------------------
your point - move down or up

"unused"

start point .bcc section - sys brk move up(alloc) or down(free)( new point must be align 8 )
------------------------------------
Program Code and Data
------------------------------------ 0x8048000
Post 25 Jan 2007, 09:59
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
no, i didn't know that. thank you.

that means mmap() always returns pointers above 0xC0000000?
Post 25 Jan 2007, 11:08
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Nikolay Petrov



Joined: 22 Apr 2004
Posts: 101
Location: Bulgaria
Nikolay Petrov
mmap moved your point down
Post 25 Jan 2007, 16:17
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