sources of linux 'system call'

sources of linux 'system call'

[Lukas]

Hi.
I'm looking for sources of system calls. 
I mean ...  what program is exeecute after I call 'int
$0x80' :), for example

	movq $125,%rax  # call sys_mprotect
	movq $smc_address,%rbx
	movq $0x1000,%rcx
	movq $7,%rdx
	int $0x80

        ?????????????????
        ?????????????????

i want to ask if enybody knows where can i find it
(they should be somewhere in kernale source, but i
couldn't find it)

Regards
Lukas




       
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Re: sources of linux 'system call'

[Joshua Roys]

Lukas wrote:
> Hi.
> I'm looking for sources of system calls. 
> I mean ...  what program is exeecute after I call 'int
> $0x80' :), for example
> 
> 	movq $125,%rax  # call sys_mprotect
> 	movq $smc_address,%rbx
> 	movq $0x1000,%rcx
> 	movq $7,%rdx
> 	int $0x80
> 
>         ?????????????????
>         ?????????????????
> 
> i want to ask if enybody knows where can i find it
> (they should be somewhere in kernale source, but i
> couldn't find it)
> 
> Regards
> Lukas
> 

Hi,

Do something like:

~/sources/linux-2.6.22.y> find . -type f -exec grep -H sys_open \{} \;

for the open system call code..  they're all over the place, the system
calls.

sys_open, for example, is in fs/open.c

Good luck,

Joshua Roys

Re: sources of linux 'system call'

[Lukas]

Thank You for answer ... i'll read this sources ...
but actualy i want to know what instructions processor
recive after int. My goal is to understand better GDT,
IDT, LDT in Linux, i want to know what's going on when
i call for example 125 system call (sys_mprotect)
whitch allow me change acces rights to given memory
area. Theory i know ( almost everything is writen in
Intel guides ) but i need practice. By the way if
smoebody knoe how to change acces rigts to memory
without system calls, please help :)

regards
Lukas
--- Joshua Roys <TheReader06@comcast.net> wrote:

> Lukas wrote:
> > Hi.
> > I'm looking for sources of system calls. 
> > I mean ...  what program is exeecute after I call
> 'int
> > $0x80' :), for example
> > 
> > 	movq $125,%rax  # call sys_mprotect
> > 	movq $smc_address,%rbx
> > 	movq $0x1000,%rcx
> > 	movq $7,%rdx
> > 	int $0x80
> > 
> >         ?????????????????
> >         ?????????????????
> > 
> > i want to ask if enybody knows where can i find it
> > (they should be somewhere in kernale source, but i
> > couldn't find it)
> > 
> > Regards
> > Lukas
> > 
> 
> Hi,
> 
> Do something like:
> 
> ~/sources/linux-2.6.22.y> find . -type f -exec grep
> -H sys_open \{} \;
> 
> for the open system call code..  they're all over
> the place, the system
> calls.
> 
> sys_open, for example, is in fs/open.c
> 
> Good luck,
> 
> Joshua Roys
> 
> -
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> 



       
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Re: sources of linux 'system call'

[Joshua Roys]

Lukas wrote:
> Thank You for answer ... i'll read this sources ...
> but actualy i want to know what instructions processor
> recive after int. My goal is to understand better GDT,
> IDT, LDT in Linux, i want to know what's going on when
> i call for example 125 system call (sys_mprotect)
> whitch allow me change acces rights to given memory
> area. Theory i know ( almost everything is writen in
> Intel guides ) but i need practice. By the way if
> smoebody knoe how to change acces rigts to memory
> without system calls, please help :)
> 
> regards
> Lukas

Hello,

Take a look at (for i386): arch/i386/kernel/entry.S
Then find a line like: ENTRY(system_call)
That gets set in the IDT in: arch/i386/kernel/traps.c, near the end of
function trap_init()
Specifically: set_system_gate(SYSCALL_VECTOR, &systen_call), where
SYSCALL_VECTOR is defined to be 0x80
And: include/asm-i386/desc.h has some items that may be of interest to you.

Good luck,

Joshua Roys