Re: [Bug 1880225] [NEW] Emulation of some arm programs fail with "Assertion `have_guest_base' failed."

[Alex Bennée]

Aleksandar Markovic <address@hidden> writes:

> Public bug reported:
>
> This issue is observer with QEMU ToT, checked out around May 15th (but I
> believe it is present in current master too), and wasn't present in QEMU
> v5.0.0.
>
> I am using 32-bit Intel(R) Pentium(R) M processor 1.73GHz host.
>
> Arm cross-compiler is a standard cross-compiler that comes with Debian-
> based distributions, and gcc version is:
>
> $ arm-linux-gnueabi-gcc --version
> arm-linux-gnueabi-gcc (Debian 8.3.0-2) 8.3.0
>
> Compile this program with cross compiler:
>
> $ arm-linux-gnueabi-gcc -O2 -static toupper_string.c -o toupper_string-
> arm
>
> Emulation with QEMU v5.0.0 is correct, and gives expected output:
>
> $ ~/Build/qemu-5.0.0/build-gcc/arm-linux-user/qemu-arm ./toupper_string-arm
> CONTROL RESULT: (toupper_string)
>  nwlrbbmqbhcdarz owkkyhiddqscdxr jmowfrxsjybldbe fsarcbynecdyggx 
> xpklorellnmpapq
>  NWLRBBMQBHCDARZ OWKKYHIDDQSCDXR JMOWFRXSJYBLDBE FSARCBYNECDYGGX 
> XPKLORELLNMPAPQ
>
> While, in case of QEMU master it fails:
>
> $ ~/Build/qemu-master/build-gcc/arm-linux-user/qemu-arm ./toupper_string-arm
> qemu-arm: /home/rtrk/Build/qemu-master/linux-user/elfload.c:2294: 
> probe_guest_base: Assertion `have_guest_base' failed.
> Aborted
<snip>

Works for me in our TCG tests on master:

20:15:43 [alex@zen:~/l/q/b/user.static] review/aarch64-vms-v7|… + 
./arm-linux-user/qemu-arm ./tests/tcg/arm-linux-user/toupper
CONTROL RESULT: (toupper_string)
 nwlrbbmqbhcdarz owkkyhiddqscdxr jmowfrxsjybldbe fsarcbynecdyggx xpklorellnmpapq
 NWLRBBMQBHCDARZ OWKKYHIDDQSCDXR JMOWFRXSJYBLDBE FSARCBYNECDYGGX XPKLORELLNMPAPQ

I have submitted a fix to the list that affected programs that couldn't
see /proc/self/maps but I guess that isn't the case here.

-- 
Alex Bennée