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armv7m: Report no-coprocessor faults correctly

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For v7M attempts to access a nonexistent coprocessor are reported
differently from plain undefined instructions (as UsageFaults of type
NOCP rather than type UNDEFINSTR). Split them out into a new
EXCP_NOCP so we can report the FSR value correctly.

Backports commit 7517748e3f71a3099e57915fba95c4c308e6d842 from qemu
This commit is contained in:
Peter Maydell 2018-03-02 13:54:34 -05:00 committed by Lioncash
parent fce8138187
commit 8a6d746aef
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1 changed files with 8 additions and 0 deletions
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8
qemu/target/arm/translate.c
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@ -10473,6 +10473,14 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw
break;
case 6: case 7: case 14: case 15:
/* Coprocessor. */
if (arm_dc_feature(s, ARM_FEATURE_M)) {
/* We don't currently implement M profile FP support,
* so this entire space should give a NOCP fault.
*/
gen_exception_insn(s, 4, EXCP_NOCP, syn_uncategorized(),
default_exception_el(s));
break;
}
if (((insn >> 24) & 3) == 3) {
/* Translate into the equivalent ARM encoding. */
insn = (insn & 0xe2ffffff) | ((insn & (1 << 28)) >> 4) | (1 << 28);