Address or offset of all syscall trampolines

[Lou Gavin]

Hello all,

I know that the trampolines are the interface for the untrusted code to invoke system calls, 

All trampolines are identical and responsible for certain syscall.

What I what to know is that is there information about where (offset or address) these trampolines exactly are?

Ex : 

assume the entry point of trampoline_of_nacl_mkdir is at 0x1120

Then, I can translate some native code to the following assembly : 

[guest]

;

;text section
;

call _sys_mkdir
-------------------------------------


[host]

-------------------------------------

;

;text section
;

mov eax dword[ds:ebx]

and eax, 0xffffffe0

call eax

-------------------------------------

;

;data section

;

20 11 00 00 ;trampoline of nacl_mkdir

Thanks in advance.