Re: [Qemu-arm] QEMU user mode for cortex M

[Massimiliano Cialdi]

On Sat, Mar 16, 2019 at 1:01 PM Alex Bennée <address@hidden> wrote:
>
>
> Massimiliano Cialdi <address@hidden> writes:
>
> > I have my exetutable compiled with
> > /opt/gcc-arm-none-eabi-8-2018-q4-major/bin/arm-none-eabi-gcc -std=gnu11
> > -mcpu=cortex-m7 -mthumb -mfloat-abi=hard -mfpu=fpv5-d16 -fno-common
> > -specs=rdimon.specs -Wl,--cref,-Map=main.map main.c -o main.elf
>
> I thought you wanted to target a cortex-m4?
yes.
I tried to compile it like this.:
/opt/gcc-arm-none-eabi-8-2018-q4-major/bin/arm-none-eabi-gcc
-std=gnu11 -mcpu=cortex-m4 -mthumb  -fno-common -specs=rdimon.specs
-Wl,--cref,-Map=main.map -T prova.ld -O0 -g3 main.c -o main.elf
The linker script is attached

I don't know how to compile with arm-linux-gnueabihf-gcc

>
> Have a look at how test-armv6m-undef is built. It is the simplest
> dumbest M profile image you can build with a kernel that maps to 0 and a
> simple reset vector at the start of the vector table:
I don't want to have to deal with interrupt vectors and memory layouts.
Just see "hallo world!" on the output.



> I don't know what the virt machine defaults to for CPU but I'm fairly
> sure it's not an m-profile CPU.
I had only tried the machine none and virt... I didn't know which one
to choose for cortex M4


> It's hard to say without seeing what your test is doing. However I can force
> a cortex-m4 on a microbit and run the following ok:
>
>   ./qemu-system-arm  -monitor none -display none \
>                      -chardev file,path=test-armv6m-undef.out,id=output \
>                      -semihosting -M microbit \
>                      -cpu cortex-m4 \
>                      -kernel tests/test-armv6m-undef
>                      -d in_asm,cpu,nochain

tried with:
~/Downloads/qemu/qemu-3.1.0/arm-softmmu/qemu-system-arm -d
in_asm,cpu,nochain,unimp,guest_errors -chardev
file,path=prova.out,id=output -machine microbit -cpu cortex-m4
-monitor null -serial null  -semihosting -nographic
-semihosting-config enable=on,target=native  -kernel main.elf
----------------
IN:
0x00000000:  00000000  andeq    r0, r0, r0

R00=00000000 R01=00000000 R02=00000000 R03=00000000
R04=00000000 R05=00000000 R06=00000000 R07=00000000
R08=00000000 R09=00000000 R10=00000000 R11=00000000
R12=00000000 R13=00000000 R14=ffffffff R15=00000000
XPSR=40000000 -Z-- A priv-thread
nrf51_soc.private: unimplemented device write (size 4, value 0x0,
offset 0xfffffe0)
nrf51_soc.private: unimplemented device write (size 4, value 0x0,
offset 0xfffffe4)
nrf51_soc.private: unimplemented device write (size 4, value 0x0,
offset 0xfffffe8)
nrf51_soc.private: unimplemented device write (size 4, value 0x0,
offset 0xfffffec)
nrf51_soc.private: unimplemented device write (size 4, value 0x0,
offset 0xffffff0)
nrf51_soc.private: unimplemented device write (size 4, value
0xffffffff, offset 0xffffff4)
nrf51_soc.private: unimplemented device write (size 4, value 0x0,
offset 0xffffff8)
nrf51_soc.private: unimplemented device write (size 4, value
0x40000000, offset 0xffffffc)
----------------
IN:
0x00000000:  00000000  andeq    r0, r0, r0

R00=00000000 R01=00000000 R02=00000000 R03=00000000
R04=00000000 R05=00000000 R06=00000000 R07=00000000
R08=00000000 R09=00000000 R10=00000000 R11=00000000
R12=00000000 R13=ffffffe0 R14=fffffff9 R15=00000000
XPSR=40000003 -Z-- A handler
qemu: fatal: Lockup: can't escalate 3 to HardFault (current priority -1)

R00=00000000 R01=00000000 R02=00000000 R03=00000000
R04=00000000 R05=00000000 R06=00000000 R07=00000000
R08=00000000 R09=00000000 R10=00000000 R11=00000000
R12=00000000 R13=ffffffe0 R14=fffffff9 R15=00000000
XPSR=40000003 -Z-- A handler
FPSCR: 00000000
Aborted (core dumped)


still no success

best regards
Max


--
Et nunc, auxilium solis, vincam!
Oppugnatio solaris!
VIS!

Massimiliano Cialdi
address@hidden

prova.ld
Description: Binary data