GDB Pocket Reference

Name

x

x [[/NFU] addr]

Examine the data at address. Subsequent x commands without an address move forward in memory according to the values for N, F, and U.

The N value is a repeat count, for example, to examine a given number of instructions. The F value is a format, indicating how to print the data. The U value is the unit size in bytes of the items to be displayed.

GBD stores the address printed by the x command in the $_ convenience variable. It stores the contents of the address in the $_ _ convenience variable.

Format Values

a

Print the value as an address. The address is printed as both an absolute (hexadecimal) address and as an offset from the nearest symbol.

c

Print the value as a character constant.

d

Print the value as a signed decimal integer.

f

Print the value as a floating-point number.

i

Print the value as a machine instruction.

o

Print the value as an octal integer.

s

Print the value as a NUL-terminated string.

t

Print the value as a binary integer (t stands for “two”).

u

Print the value as an unsigned decimal integer.

x

Print the value as a hexadecimal integer.

Unit Size Values

b

Bytes.

g

Giant words, i.e., 8 bytes.

h

Halfwords, i.e., 2 bytes.

w

Words, i.e., 4 bytes.