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#advanced

[Step-9] Step to next instruction ~ mov dword [local_8h], 5

In this step, we're doing two things - (a) ds - command to step to next instruction (b) px @rbp-0x8 - command to view contents of variable (local_8h)

Remember rip, the instruction pointer?

Instruction pointer register (rip) points to the next instruction to execute. In previous screenshot (click), the rip is at instruction mov dword [local_ch], 4

This means when we use command "ds", instruction mov dword [local_ch], 4 should be executed

However, we have already executed command "ds" once in Step-8 (here)

... (continued)

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#advanced

[Step-9] ds and px @rbp-0x8 explained

... continued from here

Hence our command "ds" in Step-9 (see screenshot) actually excutes instruction next to mov dword [local_ch], 4 which is mov dword [local_8h], 5 as seen from screenshot (box-3)

When mov dword [local_8h], 5 gets executed using "ds", the constant "5" is stored in variable "local_8h"

Let's examine the variable local_8h now using px @rbp-0x8 ~ screenshot (box-2)

Note: We're using @rbp-0x8 with "px" (alias for print hexadecimal) because rbp-0x8 is actual memory location of variable local_8h

We can confirm value of "local_8h" is indeed "5" see screenshot (box-3)

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#advanced

[Step-10] pdf once again

Let's print the disassembly function using command "pdf"

Box-2 shows where our instruction pointer (rip) currently is i.e. just after mov dword [local_8h], 5 (box-3) - the instruction that we've executed in last step using "ds"

What if we run "ds" again?

Let's see

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#advanced

[Step-11] dr[?]

Command "dr" is used to print 'gpr' (general purpose) registers

We can also print value of a specific register using dr <register>

In above screenshot, we run "ds" (box-1) again and it executes next instruction mov edx, dword [local_ch] (box-3)

What does "mov edx, dword [local_ch]" do?

Value of variable local_ch is moved to edx register

We know from here (click) local_ch is "4" and hence after "ds" is executed edx becomes "4" as well

After running next command "dr", we can see ¹rdx is indeed "4" (0x00000004) ~ see above screenshot

¹Note: edx is the low 32 bit of the rdx register, which is a 64 bit register

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#advanced

[Step-12] step read repeat

1. Step to next instruction

Let's step to next instruction "mov eax, dword [local_8h]" with "ds" ("local_8h" i.e. "5" is moved to eax)

2. Read general purpose registers

Print gpr using "dr" and confirm value of rax is indeed "5" 0x00000005

3. Repeat steps 1 and 2

Running "ds" once again should now execute "add eax, edx" ~ adds rax "5" and rdx "4" stores the sum in rax

Using "dr", we can see rax is "9" 0x00000009 as expected

4. End

Before executing next instruction "mov dword [local_4h], eax", print the variable "local_4h" using "px @rbp-0x4"

We get "00"

Next instruction is "mov dword [local_4h], eax"

Execute it using "ds" and run "px @rbp-0x4" again, we get "09" expected as value of rax was 0x00000009

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