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target/arm: Implement M-profile VPR register

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If MVE is implemented for an M-profile CPU then it has a VPR
register, which tracks predication information.

Implement the read and write handling of this register, and
the migration of its state.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210520152840.24453-7-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-05-20 16:28:37 +01:00
parent 300137965d
commit 7c3d47dab9
3 changed files with 63 additions and 0 deletions
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19
target/arm/machine.c
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@ -318,6 +318,24 @@ static const VMStateDescription vmstate_m_fp = {
}
};
static bool mve_needed(void *opaque)
{
ARMCPU *cpu = opaque;
return cpu_isar_feature(aa32_mve, cpu);
}
static const VMStateDescription vmstate_m_mve = {
.name = "cpu/m/mve",
.version_id = 1,
.minimum_version_id = 1,
.needed = mve_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT32(env.v7m.vpr, ARMCPU),
VMSTATE_END_OF_LIST()
},
};
static const VMStateDescription vmstate_m = {
.name = "cpu/m",
.version_id = 4,
@ -344,6 +362,7 @@ static const VMStateDescription vmstate_m = {
&vmstate_m_other_sp,
&vmstate_m_v8m,
&vmstate_m_fp,
&vmstate_m_mve,
NULL
}
};