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MISP3 DRC: Fix tlbmiss in delay slot (#4979)

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This commit is contained in:
tedgreen99 2019-05-05 13:46:16 -06:00 committed by MooglyGuy
parent 2d35202667
commit 4426b2bac8
1 changed files with 10 additions and 5 deletions
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15
src/devices/cpu/mips/mips3drc.cpp
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@ -673,7 +673,10 @@ void mips3_device::static_generate_tlb_mismatch()
alloc_handle(*m_drcuml, m_tlb_mismatch, "tlb_mismatch");
UML_HANDLE(block, *m_tlb_mismatch); // handle tlb_mismatch
UML_RECOVER(block, I0, MAPVAR_PC); // recover i0,PC
UML_MOV(block, mem(&m_core->pc), I0); // mov <pc>,i0
// Need the current PC address for the instruction to do the TLB lookup
// so need to adjust I0 so it points to the true PC address in case this is a delay slot
UML_ADD(block, I0, I0, 3); // add i1,i0,3
UML_AND(block, I0, I0, ~3); // and i0,i0,~3
UML_SHR(block, I1, I0, 12); // shr i1,i0,12
UML_LOAD(block, I1, (void *)vtlb_table(), I1, SIZE_DWORD, SCALE_x4); // load i1,[vtlb_table],i1,dword
if (PRINTF_MMU)
@ -693,9 +696,11 @@ void mips3_device::static_generate_tlb_mismatch()
save_fast_iregs(block);
// the saved PC may be set 1 instruction back with the low bit set to indicate
// a delay slot; in this path we want the original instruction address, so recover it
UML_ADD(block, I0, mem(&m_core->pc), 3); // add i0,<pc>,3
UML_AND(block, mem(&m_core->pc), I0, ~3); // and <pc>,i0,~3
// a delay slot; in this path we want the previous instruction address, so recover it
UML_RECOVER(block, I0, MAPVAR_PC); // recover i0,PC
UML_AND(block, I0, I0, ~3); // and i0,i0,~3
UML_MOV(block, mem(&m_core->pc), I0); // mov i0,[pc]
UML_EXIT(block, EXECUTE_MISSING_CODE); // exit EXECUTE_MISSING_CODE
block.end();
@ -1236,7 +1241,7 @@ void mips3_device::generate_sequence_instruction(drcuml_block &block, compiler_s
{
if (PRINTF_MMU)
{
static const char text[] = "Compiler page fault @ %08X";
static const char text[] = "Compiler page fault @ %08X\n";
UML_MOV(block, mem(&m_core->format), (uintptr_t)text); // mov [format],text
UML_MOV(block, mem(&m_core->arg0), desc->pc); // mov [arg0],desc->pc
UML_CALLC(block, cfunc_printf_debug, this); // callc printf_debug