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docs: disable KASLR when debugging kernel 

commit 6807c84652 ("x86: Enable KASLR by default") enables KASLR
by default on x86. While KASLR will confuse gdb which resolve kernel
symbol address from symbol table of vmlinux. We should turn off KASLR for
kernel debugging.

Signed-off-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Reviewed-by: Kieran Bingham <kbingham@kernel.org>
Acked-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
hifive-unleashed-5.1
Zhouyi Zhou 2017-07-07 16:51:45 +08:00 committed by Jonathan Corbet
parent 14994a9bb4
commit e604f1cb85
1 changed files with 4 additions and 2 deletions
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6
Documentation/dev-tools/gdb-kernel-debugging.rst
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@ -31,11 +31,13 @@ Setup
CONFIG_DEBUG_INFO_REDUCED off. If your architecture supports
CONFIG_FRAME_POINTER, keep it enabled.
- Install that kernel on the guest.
- Install that kernel on the guest, turn off KASLR if necessary by adding
"nokaslr" to the kernel command line.
Alternatively, QEMU allows to boot the kernel directly using -kernel,
-append, -initrd command line switches. This is generally only useful if
you do not depend on modules. See QEMU documentation for more details on
this mode.
this mode. In this case, you should build the kernel with
CONFIG_RANDOMIZE_BASE disabled if the architecture supports KASLR.
- Enable the gdb stub of QEMU/KVM, either