tree 3dfb4f8f80a0d23ace83ded9de98822468a01f16
parent 6875204c782e7c9aa5c28f96b2583fd31c50468f
author Jan Kiszka <jan.kiszka@siemens.com> 1253204053 +0200
committer Anthony Liguori <aliguori@us.ibm.com> 1254753165 -0500

gdbstub: x86: Switch 64/32 bit registers dynamically

Commit 56aebc891674cd2d07b3f64183415697be200084 changed gdbstub in way
that debugging 32 or 16-bit guest code is no longer possible with qemu
for x86_64 guest CPUs. Since that commit, qemu only provides registers
sets for 64-bit, forcing current and foreseeable gdb to also switch its
architecture to 64-bit. And this breaks if the inferior is 32 or 16 bit.

No question, this is a gdb issue. But, as it was confirmed in several
discusssions with gdb people, it is a non-trivial thing to fix. So until
qemu finds a gdb version attach with a rework x86 support, we have to
work around it by switching the register layout as the guest switches
its execution mode between 16/32 and 64 bit.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>