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ppc: set DSISR to the DSI flags rather than the address on data access faults. [R. Belmont, maximumspatium]

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This commit is contained in:
arbee 2016-12-20 22:58:01 -05:00
parent 234b4665ce
commit 795eaa2f63
3 changed files with 45 additions and 3 deletions
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1
src/devices/cpu/powerpc/ppc.h
View File

@ -243,6 +243,7 @@ public:
void ppccom_tlb_flush();
void ppccom_execute_mfdcr();
void ppccom_execute_mtdcr();
void ppccom_get_dsisr();
protected:
// device-level overrides

21
src/devices/cpu/powerpc/ppccom.cpp
View File

@ -1497,6 +1497,27 @@ void ppc_device::ppccom_tlb_flush()
OPCODE HANDLING
***************************************************************************/
/*-------------------------------------------------
ppccom_get_dsisr - gets the DSISR value for a
failing TLB lookup's data access exception.
-------------------------------------------------*/
void ppc_device::ppccom_get_dsisr()
{
int intent = 0;
if (m_core->param1 & 1)
{
intent = TRANSLATE_WRITE;
}
else
{
intent = TRANSLATE_READ;
}
m_core->param1 = ppccom_translate_address_internal(intent, m_core->param0);
}
/*-------------------------------------------------
ppccom_execute_tlbie - execute a TLBIE
instruction

26
src/devices/cpu/powerpc/ppcdrc.cpp
View File

@ -642,6 +642,11 @@ static void cfunc_ppccom_execute_mtdcr(void *param)
ppc->ppccom_execute_mtdcr();
}
static void cfunc_ppccom_get_dsisr(void *param)
{
ppc_device *ppc = (ppc_device *)param;
ppc->ppccom_get_dsisr();
}
/***************************************************************************
STATIC CODEGEN
@ -784,7 +789,11 @@ void ppc_device::static_generate_tlb_mismatch()
UML_LABEL(block, isi); // isi:
if (!(m_cap & PPCCAP_603_MMU))
{
UML_MOV(block, SPR32(SPROEA_DSISR), mem(&m_core->param0)); // mov [dsisr],[param0]
// DAR gets the address, DSISR gets the 'reason' flags
UML_MOV(block, SPR32(SPROEA_DAR), mem(&m_core->param0)); // mov [dar],[param0]
m_core->param1 = 0; // always a read here
UML_CALLC(block, (c_function)cfunc_ppccom_get_dsisr, this); // get DSISR to param1
UML_MOV(block, SPR32(SPROEA_DSISR), mem(&m_core->param1)); // move [dsisr], [param1]
UML_EXH(block, *m_exception[EXCEPTION_ISI], I0); // exh isi,i0
}
else
@ -1389,8 +1398,19 @@ void ppc_device::static_generate_memory_accessor(int mode, int size, int iswrite
/* general case: DSI exception */
else
{
UML_MOV(block, SPR32(SPROEA_DSISR), mem(&m_core->param0)); // mov [dsisr],[param0]
UML_EXH(block, *m_exception[EXCEPTION_DSI], I0); // exh dsi,i0
UML_MOV(block, SPR32(SPROEA_DAR), mem(&m_core->param0)); // mov [dar],[param0]
// signal read or write to cfunc to get proper reason back
if (iswrite)
{
m_core->param1 = 1;
}
else
{
m_core->param1 = 0;
}
UML_CALLC(block, (c_function)cfunc_ppccom_get_dsisr, this); // get DSISR to param1
UML_MOV(block, SPR32(SPROEA_DSISR), mem(&m_core->param1)); // move [dsisr], [param1]
UML_EXH(block, *m_exception[EXCEPTION_DSI], I0); // exh dsi,i0
}
}