[qemu] Fix VERSATILEPB kernel boot in QEMU broken by r300968
QEMU does not implement hardware debug registers so when dbg_monitor_is_enabled is called kernel receives "invalid instruction" exception. QEMU implements only DIDR register and on read returns all zeroes to indicate that it doesn't support other registers. Real hardware has Version bits set. MFC after: 1 week
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=310791
@ -792,10 +792,21 @@ dbg_get_ossr(void)
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static __inline boolean_t
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dbg_arch_supported(void)
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{
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uint32_t dbg_didr;
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switch (dbg_model) {
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case ID_DFR0_CP_DEBUG_M_V6:
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case ID_DFR0_CP_DEBUG_M_V6_1:
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dbg_didr = cp14_dbgdidr_get();
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/*
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* read-all-zeroes is used by QEMU
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* to indicate that ARMv6 debug support
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* is not implemented. Real hardware has at
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* least version bits set
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*/
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if (dbg_didr == 0)
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return (FALSE);
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return (TRUE);
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case ID_DFR0_CP_DEBUG_M_V7:
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case ID_DFR0_CP_DEBUG_M_V7_1: /* fall through */
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return (TRUE);
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