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Restore the debug register operation on 486+

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But put it behind a compile-time option due to performance hits
Also add the DE flag to CPUID on supported CPUs
This commit is contained in:
Alexander Babikov
2024-01-15 06:22:38 +05:00
parent d182f4c553
commit a07ffdecab
12 changed files with 531 additions and 37 deletions
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12
src/cpu/x86_ops_ret.h
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@@ -135,6 +135,9 @@ opIRET_186(uint32_t fetchdat)
}
flags_extract();
nmi_enable = 1;
#ifdef USE_DEBUG_REGS_486
rf_flag_no_clear = 1;
#endif
CPU_BLOCK_END();
PREFETCH_RUN(cycles_old - cycles, 1, -1, 2, 0, 0, 0, 0);
@@ -175,6 +178,9 @@ opIRET_286(uint32_t fetchdat)
}
flags_extract();
nmi_enable = 1;
#ifdef USE_DEBUG_REGS_486
rf_flag_no_clear = 1;
#endif
CPU_BLOCK_END();
PREFETCH_RUN(cycles_old - cycles, 1, -1, 2, 0, 0, 0, 0);
@@ -243,6 +249,9 @@ opIRET(uint32_t fetchdat)
}
flags_extract();
nmi_enable = 1;
#ifdef USE_DEBUG_REGS_486
rf_flag_no_clear = 1;
#endif
CPU_BLOCK_END();
PREFETCH_RUN(cycles_old - cycles, 1, -1, 2, 0, 0, 0, 0);
@@ -285,6 +294,9 @@ opIRETD(uint32_t fetchdat)
}
flags_extract();
nmi_enable = 1;
#ifdef USE_DEBUG_REGS_486
rf_flag_no_clear = 1;
#endif
CPU_BLOCK_END();
PREFETCH_RUN(cycles_old - cycles, 1, -1, 0, 2, 0, 0, 1);