Public bug reported:
A basic program runs fine if compiled with flag -O0 with gcc, but triggers a
qemu abort when compiled with -O1 and run with icount:
"qemu: fatal: IO on conditional branch instruction"
I also noticed the problem on C source like this with -O0:
"int foo = *bar; bar++;" : OK
"int foo = *bar++;" : FAIL (!!!)
Optimized binary attached to this ticket.
command line:
qemu-system-arm -M lm3s6965evb -nographic -kernel hello.bin -serial file:$(tty)
-icount 4 -cpu cortex-m4
(working fine without icount)
version:
QEMU emulator version 2.11.50 (v2.11.0-2146-gd9bbfea-dirty)
Compilation options:
./configure --target-list=arm-softmmu --disable-slirp --disable-blobs
--disable-docs --disable-guest-agent --disable-gnutls --disable-nettle
--disable-gcrypt --disable-sdl --disable-gtk --disable-vnc --disable-virtfs
--disable-mpath --disable-xen --disable-brlapi --disable-curl --disable-bluez
--disable-kvm --disable-hax --disable-hvf --disable-whpx --disable-rdma
--disable-vde --disable-netmap --disable-linux-aio --disable-cap-ng
--disable-attr --disable-vhost-net --disable-spice --disable-rbd
--disable-libiscsi --disable-libnfs --disable-smartcard --disable-libusb
--disable-live-block-migration --disable-usb-redir --disable-lzo
--disable-snappy --disable-bzip2 --disable-seccomp --disable-glusterfs
--disable-tpm --disable-libssh2 --disable-numa --disable-libxml2
--disable-tcmalloc --disable-jemalloc --disable-replication
--disable-vhost-vsock --disable-opengl --disable-virglrenderer --disable-xfsctl
--disable-qom-cast-debug --disable-vxhs --disable-crypto-afalg
--disable-vhost-user --disable-capstone --disable-pie
--extra-cflags=-mtune=native
I have also tested previous versions:
- stock qemu-system-arm 2.5.0 from ubuntu 16.04: OK
- git version: QEMU emulator version 2.10.0 (v2.10.2-dirty): OK
- git version: QEMU emulator version 2.10.90 (v2.11.0-rc0-dirty): FAIL
** Affects: qemu
Importance: Undecided
Status: New
** Attachment added: "hello.bin"
https://bugs.launchpad.net/bugs/1755479/+attachment/5078133/+files/hello.bin
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https://bugs.launchpad.net/bugs/1755479
Title:
Cortex M:qemu abort with optimized code and icount
Status in QEMU:
New
Bug description:
A basic program runs fine if compiled with flag -O0 with gcc, but triggers a
qemu abort when compiled with -O1 and run with icount:
"qemu: fatal: IO on conditional branch instruction"
I also noticed the problem on C source like this with -O0:
"int foo = *bar; bar++;" : OK
"int foo = *bar++;" : FAIL (!!!)
Optimized binary attached to this ticket.
command line:
qemu-system-arm -M lm3s6965evb -nographic -kernel hello.bin -serial
file:$(tty) -icount 4 -cpu cortex-m4
(working fine without icount)
version:
QEMU emulator version 2.11.50 (v2.11.0-2146-gd9bbfea-dirty)
Compilation options:
./configure --target-list=arm-softmmu --disable-slirp --disable-blobs
--disable-docs --disable-guest-agent --disable-gnutls --disable-nettle
--disable-gcrypt --disable-sdl --disable-gtk --disable-vnc --disable-virtfs
--disable-mpath --disable-xen --disable-brlapi --disable-curl --disable-bluez
--disable-kvm --disable-hax --disable-hvf --disable-whpx --disable-rdma
--disable-vde --disable-netmap --disable-linux-aio --disable-cap-ng
--disable-attr --disable-vhost-net --disable-spice --disable-rbd
--disable-libiscsi --disable-libnfs --disable-smartcard --disable-libusb
--disable-live-block-migration --disable-usb-redir --disable-lzo
--disable-snappy --disable-bzip2 --disable-seccomp --disable-glusterfs
--disable-tpm --disable-libssh2 --disable-numa --disable-libxml2
--disable-tcmalloc --disable-jemalloc --disable-replication
--disable-vhost-vsock --disable-opengl --disable-virglrenderer --disable-xfsctl
--disable-qom-cast-debug --disable-vxhs --disable-crypto-afalg
--disable-vhost-user --disable-capstone --disable-pie
--extra-cflags=-mtune=native
I have also tested previous versions:
- stock qemu-system-arm 2.5.0 from ubuntu 16.04: OK
- git version: QEMU emulator version 2.10.0 (v2.10.2-dirty): OK
- git version: QEMU emulator version 2.10.90 (v2.11.0-rc0-dirty): FAIL
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