How To Access Registers In Gdb

Meridian 5 Answer for How to print register values in GDB?

96

info registers shows all the registers; info registers eax shows just the annals eax. The command can be abbreviated as i r

80

If you lot're trying to print a specific annals in GDB, you have to omit the % sign. For case,

              info registers eip                          

If your executable is 64 fleck, the registers first with r. Starting them with e is not valid.

              info registers rip                          

Those tin can be abbreviated to:

              i r rip                          

78

There is also:

              info all-registers                          

So you tin can get the register proper name you lot are interested in -- very useful for finding platform-specific registers (similar NEON Q... on ARM).

60

• If only want check it one time, info registers bear witness registers.
• If only want scout 1 register, for example, display $esp proceed display esp registers in gdb control line.
• If want watch all registers, layout regs go along show registers, with TUI mode.

51

Gdb commands:

• i r <register_name>: print a single annals, eastward.chiliad i r rax, i r eax
• i r <register_name_1> <register_name_2> ...: print multiple registers, e.thou i r rdi rsi,
• i r: impress all register except floating bespeak & vector annals (xmm, ymm, zmm).
• i r a: print all register, include floating betoken & vector register (xmm, ymm, zmm).
• i r f: print all FPU floating registers (st0-7 and a few other f*)

Other register groups besides a (all) and f (float) can exist establish with:

              maint print reggroups                          

every bit documented at: https://sourceware.org/gdb/current/onlinedocs/gdb/Registers.html#Registers

Tips:

• xmm0 ~ xmm15, are 128 bits, about every modern auto has it, they are released in 1999.
• ymm0 ~ ymm15, are 256 bits, new machine usually have information technology, they are released in 2011.
• zmm0 ~ zmm31, are 512 bits, normal pc probably don't have it (every bit the year 2016), they are released in 2013, and mainly used in servers and then far.
• Just one series of xmm / ymm / zmm will exist shown, because they are the same registers in different mode. On my machine ymm is shown.

How To Access Registers In Gdb,

Source: https://thecodeteacher.com/question/16388/How-to-print-register-values-in-GDB

Posted by: onealcastocired.blogspot.com

Share this post