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target/mips/translate: Extract decode_opc_legacy() from decode_opc() 

As we will slowly move to decodetree generated decoders,
extract the legacy decoding from decode_opc(), so new
decoders are added in decode_opc() while old code is
removed from decode_opc_legacy().

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201215225757.764263-2-f4bug@amsat.org>
master
Philippe Mathieu-Daudé 2020-12-09 14:16:01 +01:00
parent 8b7322add3
commit 311edee771
1 changed files with 29 additions and 20 deletions
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49
target/mips/translate.c
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@ -30517,30 +30517,13 @@ static void gen_msa(CPUMIPSState *env, DisasContext *ctx)
}
static void decode_opc(CPUMIPSState *env, DisasContext *ctx)
static bool decode_opc_legacy(CPUMIPSState *env, DisasContext *ctx)
{
int32_t offset;
int rs, rt, rd, sa;
uint32_t op, op1;
int16_t imm;
/* make sure instructions are on a word boundary */
if (ctx->base.pc_next & 0x3) {
env->CP0_BadVAddr = ctx->base.pc_next;
generate_exception_err(ctx, EXCP_AdEL, EXCP_INST_NOTAVAIL);
return;
}
/* Handle blikely not taken case */
if ((ctx->hflags & MIPS_HFLAG_BMASK_BASE) == MIPS_HFLAG_BL) {
TCGLabel *l1 = gen_new_label();
tcg_gen_brcondi_tl(TCG_COND_NE, bcond, 0, l1);
tcg_gen_movi_i32(hflags, ctx->hflags & ~MIPS_HFLAG_BMASK);
gen_goto_tb(ctx, 1, ctx->base.pc_next + 4);
gen_set_label(l1);
}
op = MASK_OP_MAJOR(ctx->opcode);
rs = (ctx->opcode >> 21) & 0x1f;
rt = (ctx->opcode >> 16) & 0x1f;
@ -31268,9 +31251,35 @@ static void decode_opc(CPUMIPSState *env, DisasContext *ctx)
break;
default: /* Invalid */
MIPS_INVAL("major opcode");
gen_reserved_instruction(ctx);
break;
return false;
}
return true;
}
static void decode_opc(CPUMIPSState *env, DisasContext *ctx)
{
/* make sure instructions are on a word boundary */
if (ctx->base.pc_next & 0x3) {
env->CP0_BadVAddr = ctx->base.pc_next;
generate_exception_err(ctx, EXCP_AdEL, EXCP_INST_NOTAVAIL);
return;
}
/* Handle blikely not taken case */
if ((ctx->hflags & MIPS_HFLAG_BMASK_BASE) == MIPS_HFLAG_BL) {
TCGLabel *l1 = gen_new_label();
tcg_gen_brcondi_tl(TCG_COND_NE, bcond, 0, l1);
tcg_gen_movi_i32(hflags, ctx->hflags & ~MIPS_HFLAG_BMASK);
gen_goto_tb(ctx, 1, ctx->base.pc_next + 4);
gen_set_label(l1);
}
if (decode_opc_legacy(env, ctx)) {
return;
}
gen_reserved_instruction(ctx);
}
static void mips_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)