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target/ppc: Introduce DISAS_{EXIT,CHAIN}{,_UPDATE} 

Rewrite ppc_tr_tb_stop to handle these new codes.

Convert ctx->exception into these new codes at the end of
ppc_tr_translate_insn, prior to pushing the change back
throughout translate.c.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20210512185441.3619828-8-matheus.ferst@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Richard Henderson 2021-05-12 15:54:17 -03:00 committed by David Gibson
parent 2736fc6181
commit a9b5b3d06c
1 changed files with 65 additions and 10 deletions
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75
target/ppc/translate.c
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@ -185,6 +185,11 @@ struct DisasContext {
uint64_t insns_flags2;
};
#define DISAS_EXIT DISAS_TARGET_0 /* exit to main loop, pc updated */
#define DISAS_EXIT_UPDATE DISAS_TARGET_1 /* exit to main loop, pc stale */
#define DISAS_CHAIN DISAS_TARGET_2 /* lookup next tb, pc updated */
#define DISAS_CHAIN_UPDATE DISAS_TARGET_3 /* lookup next tb, pc stale */
/* Return true iff byteswap is needed in a scalar memop */
static inline bool need_byteswap(const DisasContext *ctx)
{
@ -9226,28 +9231,78 @@ static void ppc_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
opc3(ctx->opcode), opc4(ctx->opcode), ctx->opcode);
}
if (ctx->base.is_jmp == DISAS_NEXT
&& ctx->exception != POWERPC_EXCP_NONE) {
ctx->base.is_jmp = DISAS_TOO_MANY;
if (ctx->base.is_jmp == DISAS_NEXT) {
switch (ctx->exception) {
case POWERPC_EXCP_NONE:
break;
case POWERPC_EXCP_BRANCH:
ctx->base.is_jmp = DISAS_NORETURN;
break;
case POWERPC_EXCP_SYNC:
case POWERPC_EXCP_STOP:
ctx->base.is_jmp = DISAS_EXIT;
break;
default:
/* Every other ctx->exception should have set NORETURN. */
g_assert_not_reached();
}
}
}
static void ppc_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
{
DisasContext *ctx = container_of(dcbase, DisasContext, base);
DisasJumpType is_jmp = ctx->base.is_jmp;
target_ulong nip = ctx->base.pc_next;
if (ctx->base.is_jmp == DISAS_NORETURN) {
if (is_jmp == DISAS_NORETURN) {
/* We have already exited the TB. */
return;
}
if (ctx->exception == POWERPC_EXCP_NONE) {
gen_goto_tb(ctx, 0, ctx->base.pc_next);
} else if (ctx->exception != POWERPC_EXCP_BRANCH) {
if (unlikely(ctx->base.singlestep_enabled)) {
gen_debug_exception(ctx);
/* Honor single stepping. */
if (unlikely(ctx->base.singlestep_enabled)) {
switch (is_jmp) {
case DISAS_TOO_MANY:
case DISAS_EXIT_UPDATE:
case DISAS_CHAIN_UPDATE:
gen_update_nip(ctx, nip);
break;
case DISAS_EXIT:
case DISAS_CHAIN:
break;
default:
g_assert_not_reached();
}
/* Generate the return instruction */
gen_debug_exception(ctx);
return;
}
switch (is_jmp) {
case DISAS_TOO_MANY:
if (use_goto_tb(ctx, nip)) {
tcg_gen_goto_tb(0);
gen_update_nip(ctx, nip);
tcg_gen_exit_tb(ctx->base.tb, 0);
break;
}
/* fall through */
case DISAS_CHAIN_UPDATE:
gen_update_nip(ctx, nip);
/* fall through */
case DISAS_CHAIN:
tcg_gen_lookup_and_goto_ptr();
break;
case DISAS_EXIT_UPDATE:
gen_update_nip(ctx, nip);
/* fall through */
case DISAS_EXIT:
tcg_gen_exit_tb(NULL, 0);
break;
default:
g_assert_not_reached();
}
}