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Output formats (debugging with gdb)by default, gdb prints a value according to its data type If you want to search in the whole address space of the process. Sometimes this is not what you want
For example, you might want to print a number in hex, or a pointer in decimal Hey, just found a command for gdb that prints a string from memory address Or you might want to view data in memory at a certain address as a character string or as an instruction
To do these things, specify an output format when you print a value.
If gdb is printing a large array, it stops printing after it has printed the number of elements set by the set print elements command This limit also applies to the display of strings. ;drtl to print a value in gdb use print or (p in short form) command In your command x 0x00000000004004fc you have missed p command
You have to use x with p command pair to print value as hexadecimal format, like below (gdb) p/x 0x00000000004004fc if the memory address is some pointer to some structure then you have to cast the memory location before using the pointer The default is `x' (hexadecimal) initially The default changes each time you use either x or print
U, the unit size the unit size is any of
This page explains the x command The x command displays the memory contents at a given address using the specified format. Memory (debugging with gdb)each time you specify a unit size with x, that size becomes the default unit the next time you use x For the ‘ i ’ format, the unit size is ignored and is normally not written
For the ‘ s ’ format, the unit size defaults to ‘ b ’, unless it is explicitly given Without this format, gdb displays pointers to and arrays of char, unsigned char, and signed char as strings R print using the ` raw ' formatting Gdb print memory address as string
Or you might want to view data in memory at a certain address as a
Displays the memory contents at a given address using the specified format Syntax x [ address expression ] x / [ format ] [ address expression ] x
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