tree c140075eb24ddabee6eafe91975e40cc3d633a17
parent f1b8613da380af8931e34dfb4dd0a6cca392d43b
author Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> 1717667599 +0100
committer Paolo Bonzini <pbonzini@redhat.com> 1717835618 +0200

target/i386: fix size of EBP writeback in gen_enter()

The calculation of FrameTemp is done using the size indicated by mo_pushpop()
before being written back to EBP, but the final writeback to EBP is done using
the size indicated by mo_stacksize().

In the case where mo_pushpop() is MO_32 and mo_stacksize() is MO_16 then the
final writeback to EBP is done using MO_16 which can leave junk in the top
16-bits of EBP after executing ENTER.

Change the writeback of EBP to use the same size indicated by mo_pushpop() to
ensure that the full value is written back.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2198
Message-ID: <20240606095319.229650-5-mark.cave-ayland@ilande.co.uk>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>