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docs: Add to gdbstub documentation the PhyMemMode 

The PhyMemMode gdb extension command was missing from the gdb.rst
document.

Signed-off-by: Jon Doron <arilou@gmail.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20200601171609.1665397-1-arilou@gmail.com>
Message-Id: <20200709141327.14631-4-alex.bennee@linaro.org>
This commit is contained in:
Jon Doron 2020-07-09 15:13:17 +01:00 committed by Alex Bennée
parent 4d7fe02be3
commit 5067946775
1 changed files with 20 additions and 0 deletions
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docs/system/gdb.rst
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@ -87,3 +87,23 @@ three commands you can query and set the single step behavior:
(gdb) maintenance packet Qqemu.sstep=0x5
sending: "qemu.sstep=0x5"
received: "OK"
Another feature that QEMU gdbstub provides is to toggle the memory GDB
works with, by default GDB will show the current process memory respecting
the virtual address translation.
If you want to examine/change the physical memory you can set the gdbstub
to work with the physical memory rather with the virtual one.
The memory mode can be checked by sending the following command:
``maintenance packet qqemu.PhyMemMode``
This will return either 0 or 1, 1 indicates you are currently in the
physical memory mode.
``maintenance packet Qqemu.PhyMemMode:1``
This will change the memory mode to physical memory.
``maintenance packet Qqemu.PhyMemMode:0``
This will change it back to normal memory mode.