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target/alpha: Remove use_exit_tb

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We have not needed to end a TB for I/O since ba3e792669
("icount: clean up cpu_can_io at the entry to the block").
We do not need to use exit_tb for singlestep, which only
means generate one insn per TB.

Which leaves only singlestep_enabled, which means raise a
debug trap after every TB, which does not use exit_tb,
which would leave the function mis-named.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-06-20 15:40:42 -07:00
parent d3a2a1d803
commit cba201f4c7
1 changed files with 2 additions and 13 deletions
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15
target/alpha/translate.c
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@ -449,19 +449,8 @@ static bool in_superpage(DisasContext *ctx, int64_t addr)
#endif #endif
} }
static bool use_exit_tb(DisasContext *ctx)
{
return ((tb_cflags(ctx->base.tb) & CF_LAST_IO)
|| ctx->base.singlestep_enabled
|| singlestep);
}
static bool use_goto_tb(DisasContext *ctx, uint64_t dest) static bool use_goto_tb(DisasContext *ctx, uint64_t dest)
{ {
/* Suppress goto_tb in the case of single-steping and IO. */
if (unlikely(use_exit_tb(ctx))) {
return false;
}
#ifndef CONFIG_USER_ONLY #ifndef CONFIG_USER_ONLY
/* If the destination is in the superpage, the page perms can't change. */ /* If the destination is in the superpage, the page perms can't change. */
if (in_superpage(ctx, dest)) { if (in_superpage(ctx, dest)) {
@ -1270,7 +1259,7 @@ static DisasJumpType gen_call_pal(DisasContext *ctx, int palcode)
need the page permissions check. We'll see the existence of need the page permissions check. We'll see the existence of
the page when we create the TB, and we'll flush all TBs if the page when we create the TB, and we'll flush all TBs if
we change the PAL base register. */ we change the PAL base register. */
if (!use_exit_tb(ctx)) { if (!ctx->base.singlestep_enabled) {
tcg_gen_goto_tb(0); tcg_gen_goto_tb(0);
tcg_gen_movi_i64(cpu_pc, entry); tcg_gen_movi_i64(cpu_pc, entry);
tcg_gen_exit_tb(ctx->base.tb, 0); tcg_gen_exit_tb(ctx->base.tb, 0);
@ -3094,7 +3083,7 @@ static void alpha_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
tcg_gen_movi_i64(cpu_pc, ctx->base.pc_next); tcg_gen_movi_i64(cpu_pc, ctx->base.pc_next);
/* FALLTHRU */ /* FALLTHRU */
case DISAS_PC_UPDATED: case DISAS_PC_UPDATED:
if (!use_exit_tb(ctx)) { if (!ctx->base.singlestep_enabled) {
tcg_gen_lookup_and_goto_ptr(); tcg_gen_lookup_and_goto_ptr();
break; break;
} }