* [Qemu-devel] Decode of MIPS DMFC0 and DMTC0
@ 2007-01-10 20:32 Dirk Behme
2007-01-10 23:44 ` Thiemo Seufer
0 siblings, 1 reply; 2+ messages in thread
From: Dirk Behme @ 2007-01-10 20:32 UTC (permalink / raw)
To: qemu-devel
Hi,
looking into target-mips/translate.c, in function
decode_opc() OPC_DMFC0 and OPC_DMTC0 are mapped to gen_cp0()
if MIPS64 is enabled:
case OPC_CP0:
op1 = MASK_CP0(ctx->opcode);
switch (op1) {
case OPC_MFC0:
case OPC_MTC0:
#ifdef MIPS_HAS_MIPS64
case OPC_DMFC0:
case OPC_DMTC0:
#endif
gen_cp0(ctx, op1, rt, rd);
break;
But looking into gen_cp0() in same file, there is no case
statement for OPC_DMFC0 and OPC_DMTC0. Looks to me that this
results in a RI exception.
Do I overlook anything here or is DMFC0/DMTC0 decoding
missing in gen_cp0()?
Dirk
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [Qemu-devel] Decode of MIPS DMFC0 and DMTC0
2007-01-10 20:32 [Qemu-devel] Decode of MIPS DMFC0 and DMTC0 Dirk Behme
@ 2007-01-10 23:44 ` Thiemo Seufer
0 siblings, 0 replies; 2+ messages in thread
From: Thiemo Seufer @ 2007-01-10 23:44 UTC (permalink / raw)
To: Dirk Behme; +Cc: qemu-devel
Dirk Behme wrote:
> Hi,
>
> looking into target-mips/translate.c, in function
> decode_opc() OPC_DMFC0 and OPC_DMTC0 are mapped to gen_cp0()
> if MIPS64 is enabled:
>
> case OPC_CP0:
> op1 = MASK_CP0(ctx->opcode);
> switch (op1) {
> case OPC_MFC0:
> case OPC_MTC0:
> #ifdef MIPS_HAS_MIPS64
> case OPC_DMFC0:
> case OPC_DMTC0:
> #endif
> gen_cp0(ctx, op1, rt, rd);
> break;
>
> But looking into gen_cp0() in same file, there is no case
> statement for OPC_DMFC0 and OPC_DMTC0. Looks to me that this
> results in a RI exception.
>
> Do I overlook anything here or is DMFC0/DMTC0 decoding
> missing in gen_cp0()?
You are right. Note that the MIPS64 support is highly experimental at
this point, there is e.g. no proper 64bit FPU support, and no 64bit
addressing.
Thiemo
^ permalink raw reply [flat|nested] 2+ messages in thread
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2007-01-10 20:32 [Qemu-devel] Decode of MIPS DMFC0 and DMTC0 Dirk Behme
2007-01-10 23:44 ` Thiemo Seufer
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