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target/mips: Convert Rel6 CACHE/PREF opcodes to decodetree

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CACHE/PREF opcodes have been removed from the Release 6.

Add a single decodetree entry for the opcodes, triggering
Reserved Instruction if ever used.

Remove unreachable check_insn_opc_removed() calls.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201208203704.243704-9-f4bug@amsat.org>
This commit is contained in:
Philippe Mathieu-Daudé 2020-11-26 11:55:46 +01:00
parent ddc7ef8dfe
commit 6513ca15d8
2 changed files with 3 additions and 2 deletions
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3
target/mips/mips32r6.decode
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@ -19,3 +19,6 @@ LSA 000000 ..... ..... ..... 000 .. 000101 @lsa
REMOVED 010011 ----- ----- ----- ----- ------ # COP1X (COP3)
REMOVED 011100 ----- ----- ----- ----- ------ # SPECIAL2
REMOVED 101111 ----- ----- ---------------- # CACHE
REMOVED 110011 ----- ----- ---------------- # PREF

2
target/mips/translate.c
View file

@ -28619,7 +28619,6 @@ static bool decode_opc_legacy(CPUMIPSState *env, DisasContext *ctx)
gen_st_cond(ctx, rt, rs, imm, MO_TESL, false);
break;
case OPC_CACHE:
check_insn_opc_removed(ctx, ISA_MIPS_R6);
check_cp0_enabled(ctx);
check_insn(ctx, ISA_MIPS3 | ISA_MIPS_R1);
if (ctx->hflags & MIPS_HFLAG_ITC_CACHE) {
@ -28628,7 +28627,6 @@ static bool decode_opc_legacy(CPUMIPSState *env, DisasContext *ctx)
/* Treat as NOP. */
break;
case OPC_PREF:
check_insn_opc_removed(ctx, ISA_MIPS_R6);
if (ctx->insn_flags & INSN_R5900) {
/* Treat as NOP. */
} else {