Help/Support Question of commands in debugging

[Juku 5k iPhone SE 11.3.1]

If you watch this tutorial

you see after setting a watchpoint in gdb he does these commands:

 

display $r0

display $r1

display $r2

display $r3

display $r4

 

What do these commands mean? And are they still necessary to hack a game in gdb/lldb? And also what would these display commands be in lldb?

 

Thanks.

@@DiDA @@shmoo @mrslater @mrphoenix

@@Amuyea @@castix

Updated February 4, 2017 by Gaius

[Rook 545.6k iPad Pro (2nd gen) 17.4 Donor]

They're not necessary but they can be useful once you've mastered IDA & GDB.

[Juku 5k iPhone SE 11.3.1]

  On 2/4/2017 at 8:18 PM, DiDA said:

They're not necessary but they can be useful once you've mastered IDA & GDB.

they are still useful in lldb too?

[Guest]

  On 2/4/2017 at 7:57 PM, Gaius said:

If you watch this tutorial https://youtu.be/huWOxX7XxOw you see after setting a watchpoint in gdb he does these commands:

display $r0

display $r1

display $r2

display $r3

display $r4

What do these commands mean? And are they still necessary to hack a game in gdb/lldb? And also what would these display commands be in lldb?

Thanks.

@@DiDA @@shmoo @mrslater @mrphoenix

@@Amuyea @@castix

display $rx means that he is looking at what values the registers contain. You can just do i r

[0xSUBZ3R0 134k iPhone 6s Plus 12.1.1]

basicaly the display $r0 ect .....shows you the vaule of that register at every breakpoint istead of using info register everytime

[Juku 5k iPhone SE 11.3.1]

  On 2/4/2017 at 8:22 PM, MR-S14T3R said:

basicaly the display $r0 ect .....shows you the vaule of that register at every breakpoint istead of using info register everytime

oh so they still have display commands in lldb too?

[Rook 545.6k iPad Pro (2nd gen) 17.4 Donor]

  On 2/4/2017 at 8:24 PM, Gaius said:

oh so they still have display commands in lldb too?

Each gdb command has an lldb version of it too. https://lldb.llvm.org/lldb-gdb.html

[Juku 5k iPhone SE 11.3.1]

  On 2/4/2017 at 8:27 PM, DiDA said:

Each gdb command has an lldb version of it too. https://lldb.llvm.org/lldb-gdb.html

  On 2/4/2017 at 8:22 PM, MR-S14T3R said:

basicaly the display $r0 ect .....shows you the vaule of that register at every breakpoint istead of using info register everytime

  On 2/4/2017 at 8:21 PM, shmoo said:

display $rx means that he is looking at what values the registers contain. You can just do i r

thx guys