Hello,
On the PC ASLR will reduce the interest of calling function by direct litteral
address.
But, for example, if you know for sure that the libc is loaded at address X and
the function you want has offset Y within this lib, you could certainly call
that function directly using this syntax.
--
At my knowledge, it exists on PC with DOS
now with linux and windows I am not sure
but it must be too, like for getting time and date ...
also drivers may make this calls, to bios functions in the chipset of
a scsi card for example ...
Le 2014-10-02 13:28, 陳韋任 a écrit :
>> Well, you know if
>> Well, you know if you or someone else put it there. This is common for
>> BIOS-like library functions that are already present in the memory.
>
> Thanks for your explanation. I have no experience on using BIOS-like
> library, but I guess what you mean is some kind of library that
> preloaded i
> Well, you know if you or someone else put it there. This is common for
> BIOS-like library functions that are already present in the memory.
Thanks for your explanation. I have no experience on using BIOS-like
library, but I guess what you mean is some kind of library that
preloaded into memor
>> I didn't check, but how about
>>
>> ((void (*)(void))(0x1234))();
>
> Yes, you are right. But I don't know calling function (address) in such
way.
> How would you know that some function like "foo" is located at 0x1234?
Well, you know if you or someone else put it there. This is common for
BIOS
> I didn't check, but how about
>
> ((void (*)(void))(0x1234))();
Yes, you are right. But I don't know calling function (address) in such way.
How would you know that some function like "foo" is located at 0x1234?
And Ben, I found I was wrong. Not only hc08 has such logic, stm8, for
example,
On 02.10.2014 03:48, 陳韋任 (Wei-Ren Chen) wrote:
> Hi All,
>
> I have a question about genCall while tracing the codegen. The code
> snippet below:
>
> /* make the call */
> if (IS_LITERAL (etype))
> {
> /* ??? */
> }
> else
> {
> /* docall(); */
> }
>
> I can
On Thu, Oct 02, 2014 at 11:12:08AM +0800, Ben Shi wrote:
>
> which port?
>
Oops, I thought that every port's genCall shoule be nearly the same,
but apparently not.
I am looing into hc08 port. Is that genCall logic specific to hc08?
BR,
chenwj
--
Wei-Ren Chen (陳韋任)
Homepage: http://people
which port?
--
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在 2014-10-02 09:48:57，"陳韋任 (Wei-Ren Chen)" 写道：
>Hi All,
>
> I have a question about genCall while tracing the codegen. The code
>snippet below:
>
> /* make the call */
> if (IS_LITERAL (etype))
>{
> /* ??? */
>}
> else
>{
> /* docall();
Hi All,
I have a question about genCall while tracing the codegen. The code
snippet below:
/* make the call */
if (IS_LITERAL (etype))
{
/* ??? */
}
else
{
/* docall(); */
}
I can't figure out under what kind of function call will go through the
if-stmt part
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