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From: Karthik <karthikshanmugam@gmail.com>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] ARM Cortex R5 + VFP3
Date: Tue, 24 May 2016 18:37:00 +0530	[thread overview]
Message-ID: <CAAmr2Y_y2PCVLpupmf7f_Vgo706YrzXqdXGUTGsQ7LDK9i76kw@mail.gmail.com> (raw)

Hi,

I am working on adding support for a Spansion microcontroller which has an
Cortex R5 core + VFP3 co processor.

I have added the below line
set_feature(&cpu->env, ARM_FEATURE_VFP3)
to cortex_r5_initfn at /target-arm/cpu.c

But, still I got undefined exception when the processor encountered any VFP
instructions.

To get around the error, I had to enable code protected by CONFIG_USER_ONLY.

Specifically in arm_cpu_reset, where
the bits 20 to 24 are set in env->cp15.cpacr_el1 and
env->vfp.xregs[ARM_VFP_FPEXC] = 1 << 30.

I am sure there is correct way to do things. I'm new to qemu.

Any help will be much appreciated. Thank you.

Best regards,
Karthik

             reply	other threads:[~2016-05-24 13:07 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-24 13:07 Karthik [this message]
2016-05-24 13:37 ` [Qemu-devel] ARM Cortex R5 + VFP3 Peter Maydell
2016-05-24 13:49   ` Karthik
2016-05-24 14:00     ` Peter Maydell
2016-05-24 14:22       ` Karthik
2016-05-25  5:30         ` Karthik

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