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target-arm: Add the Cortex-M4 CPU

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This patch adds the Cortex-M4 CPU. The M4 is basically the same as
the M3, the main differences being the DSP instructions and an
optional FPU. Only no-FPU cortex-M4 is implemented here, cortex-M4F
is not because the core target-arm code doesn't support the M-profile
FPU model yet.

Backports commit ba890a9b2509a0087bb7eafddae02ea5ecbb7bb4 from qemu
This commit is contained in:
Aurelio C. Remonda 2018-02-13 15:07:40 -05:00 committed by Lioncash
parent 20c2ed80a2
commit 7ca21d4ab4
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 11 additions and 0 deletions
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11
qemu/target-arm/cpu.c
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@ -730,6 +730,16 @@ static void cortex_m3_initfn(struct uc_struct *uc, Object *obj, void *opaque)
cpu->midr = 0x410fc231;
}
static void cortex_m4_initfn(struct uc_struct *uc, Object *obj, void *opaque)
{
ARMCPU *cpu = ARM_CPU(uc, obj);
set_feature(&cpu->env, ARM_FEATURE_V7);
set_feature(&cpu->env, ARM_FEATURE_M);
set_feature(&cpu->env, ARM_FEATURE_THUMB_DSP);
cpu->midr = 0x410fc240; /* r0p0 */
}
static void arm_v7m_class_init(struct uc_struct *uc, ObjectClass *oc, void *data)
{
CPUClass *cc = CPU_CLASS(uc, oc);
@ -1128,6 +1138,7 @@ static const ARMCPUInfo arm_cpus[] = {
{ "arm1176", arm1176_initfn },
{ "arm11mpcore", arm11mpcore_initfn },
{ "cortex-m3", cortex_m3_initfn, arm_v7m_class_init },
{ "cortex-m4", cortex_m4_initfn, arm_v7m_class_init },
{ "cortex-a8", cortex_a8_initfn },
{ "cortex-a9", cortex_a9_initfn },
{ "cortex-a15", cortex_a15_initfn },