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Why there is no Find out what reads from this address?

 
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Erez Zrihen
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PostPosted: Fri Aug 27, 2021 9:54 am    Post subject: Why there is no Find out what reads from this address? Reply with quote

There are "Find out what accesses this address" and "Find out what writes to this address" but there is no "Find out what reads from this address"!

Why?
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LeFiXER
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PostPosted: Fri Aug 27, 2021 10:16 am    Post subject: Reply with quote

That's what accesses does it accesses the address to read its value.
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Frouk
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PostPosted: Fri Aug 27, 2021 11:12 am    Post subject: Reply with quote

Available from disassembler view(Will show the addresses and values that was accessed or written)
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Dark Byte
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PostPosted: Fri Aug 27, 2021 11:16 am    Post subject: Reply with quote

That's how the CPU works

memory can be inaccessible and accessible and when accessible it can be readonly or writable

to find writes, you set it to read only. and every signal received then is a write

the other option is to set it to inaccessible, which will show both reads and writes, as a write also has to access the inaccessible memory

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Last edited by Dark Byte on Fri Aug 27, 2021 11:34 am; edited 1 time in total
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ParkourPenguin
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PostPosted: Fri Aug 27, 2021 11:21 am    Post subject: Reply with quote

It's a hardware limitation. See this Wikipedia article for a brief summary:
https://en.wikipedia.org/wiki/X86_debug_register

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Erez Zrihen
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PostPosted: Fri Aug 27, 2021 11:31 am    Post subject: Reply with quote

ParkourPenguin wrote:
It's a hardware limitation. See this Wikipedia article for a brief summary:
https://en.wikipedia.org/wiki/X86_debug_register


Does this imply that "Find out what reads from this address" can not exist?
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Erez Zrihen
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PostPosted: Sat Aug 28, 2021 10:06 am    Post subject: Reply with quote

LeFiXER wrote:
That's what accesses does it accesses the address to read its value.


Do you say that there is no need for "Find out what reads from this address" because there is "Find out what accesses this address"?

If that so then why there is also "Find out what writes to this address" then?

According to this logic there is also no need for "Find out what writes to this address" as long as there is "Find out what accesses this address" because "Find out what accesses this address" lists both reads and writes.
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STN
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PostPosted: Sun Aug 29, 2021 4:27 pm    Post subject: Reply with quote

Laughing

funny thread

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