GDB command to write to memory

[Guillaume MENANT]

The command x is used to examine memory but i don't find the command to write directly a value in memory. I've tried X but it is not recognized.

Thanks

[Guillaume MENANT]

Guillaume MENANT wrote:

The command x is used to examine memory but i don't find the command to write directly a value in memory. I've tried X but it is not recognized.

Thanks

The only solution i've found is the "set var" command but it's limited in use. Is there a more flexible command ?

[Andreas Schwab]

Guillaume MENANT <guillaume.menant@...> writes:

> The only solution i've found is the "set var" command but it's limited in
> use. Is there a more flexible command ?

(gdb) set {int}0xdeadbeef = 42

Andreas.

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Andreas Schwab, SuSE Labs, schwab@...
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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[Michael Snyder-3]

On Wed, 2008-02-27 at 22:38 -0800, Guillaume MENANT wrote:
> The command x is used to examine memory but i don't find the command to write
> directly a value in memory. I've tried X but it is not recognized.

There's no such command.  The general method is to use
an assignment expression.  You use a cast to determine
the size of memory (byte, word...) you want to write.

(gdb) set *(char *) 0xabcd = -1

You can do tricky things by using or omitting "signed",
and usually write up to an 8-byte word by using "long long".