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target/nios2: Convert to TranslatorOps

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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-06-19 22:12:17 -07:00
parent e9150ea523
commit d67cbd9321
1 changed files with 65 additions and 63 deletions
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118
target/nios2/translate.c
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@ -803,74 +803,69 @@ static void gen_exception(DisasContext *dc, uint32_t excp)
}
/* generate intermediate code for basic block 'tb'. */
void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int max_insns)
static void nios2_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
{
DisasContext *dc = container_of(dcbase, DisasContext, base);
CPUNios2State *env = cs->env_ptr;
DisasContext dc1, *dc = &dc1;
int num_insns;
/* Initialize DC */
dc->base.tb = tb;
dc->base.singlestep_enabled = cs->singlestep_enabled;
dc->base.is_jmp = DISAS_NEXT;
dc->base.pc_first = tb->pc;
dc->base.pc_next = tb->pc;
int page_insns;
dc->mem_idx = cpu_mmu_index(env, false);
/* Set up instruction counts */
num_insns = 0;
if (max_insns > 1) {
int page_insns = (TARGET_PAGE_SIZE - (tb->pc & ~TARGET_PAGE_MASK)) / 4;
if (max_insns > page_insns) {
max_insns = page_insns;
}
}
/* Bound the number of insns to execute to those left on the page. */
page_insns = -(dc->base.pc_first | TARGET_PAGE_MASK) / 4;
dc->base.max_insns = MIN(page_insns, dc->base.max_insns);
}
gen_tb_start(tb);
do {
tcg_gen_insn_start(dc->base.pc_next);
num_insns++;
static void nios2_tr_tb_start(DisasContextBase *db, CPUState *cs)
{
}
static void nios2_tr_insn_start(DisasContextBase *dcbase, CPUState *cs)
{
tcg_gen_insn_start(dcbase->pc_next);
}
static bool nios2_tr_breakpoint_check(DisasContextBase *dcbase, CPUState *cs,
const CPUBreakpoint *bp)
{
DisasContext *dc = container_of(dcbase, DisasContext, base);
if (unlikely(cpu_breakpoint_test(cs, dc->base.pc_next, BP_ANY))) {
gen_exception(dc, EXCP_DEBUG);
/* The address covered by the breakpoint must be included in
[tb->pc, tb->pc + tb->size) in order to for it to be
properly cleared -- thus we increment the PC here so that
the logic setting tb->size below does the right thing. */
dc->pc += 4;
break;
}
/*
* The address covered by the breakpoint must be included in
* [tb->pc, tb->pc + tb->size) in order to for it to be
* properly cleared -- thus we increment the PC here so that
* the logic setting tb->size below does the right thing.
*/
dc->base.pc_next += 4;
return true;
}
if (num_insns == max_insns && (tb_cflags(tb) & CF_LAST_IO)) {
gen_io_start();
}
static void nios2_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
{
DisasContext *dc = container_of(dcbase, DisasContext, base);
CPUNios2State *env = cs->env_ptr;
dc->pc = dc->base.pc_next;
dc->base.pc_next += 4;
/* Decode an instruction */
handle_instruction(dc, env);
}
/* Translation stops when a conditional branch is encountered.
* Otherwise the subsequent code could get translated several times.
* Also stop translation when a page boundary is reached. This
* ensures prefetch aborts occur at the right place. */
} while (!dc->base.is_jmp &&
!tcg_op_buf_full() &&
num_insns < max_insns);
static void nios2_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
{
DisasContext *dc = container_of(dcbase, DisasContext, base);
/* Indicate where the next block should start */
switch (dc->base.is_jmp) {
case DISAS_NEXT:
case DISAS_TOO_MANY:
case DISAS_UPDATE:
/* Save the current PC back into the CPU register */
tcg_gen_movi_tl(cpu_R[R_PC], dc->base.pc_next);
tcg_gen_exit_tb(NULL, 0);
break;
default:
case DISAS_JUMP:
/* The jump will already have updated the PC register */
tcg_gen_exit_tb(NULL, 0);
@ -879,25 +874,32 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int max_insns)
case DISAS_NORETURN:
/* nothing more to generate */
break;
default:
g_assert_not_reached();
}
}
/* End off the block */
gen_tb_end(tb, num_insns);
static void nios2_tr_disas_log(const DisasContextBase *dcbase, CPUState *cpu)
{
qemu_log("IN: %s\n", lookup_symbol(dcbase->pc_first));
log_target_disas(cpu, dcbase->pc_first, dcbase->tb->size);
}
/* Mark instruction starts for the final generated instruction */
tb->size = dc->base.pc_next - dc->base.pc_first;
tb->icount = num_insns;
static const TranslatorOps nios2_tr_ops = {
.init_disas_context = nios2_tr_init_disas_context,
.tb_start = nios2_tr_tb_start,
.insn_start = nios2_tr_insn_start,
.breakpoint_check = nios2_tr_breakpoint_check,
.translate_insn = nios2_tr_translate_insn,
.tb_stop = nios2_tr_tb_stop,
.disas_log = nios2_tr_disas_log,
};
#ifdef DEBUG_DISAS
if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM)
&& qemu_log_in_addr_range(dc->base.pc_first)) {
FILE *logfile = qemu_log_lock();
qemu_log("IN: %s\n", lookup_symbol(dc->base.pc_first));
log_target_disas(cs, tb->pc, tb->size);
qemu_log("\n");
qemu_log_unlock(logfile);
}
#endif
void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int max_insns)
{
DisasContext dc;
translator_loop(&nios2_tr_ops, &dc.base, cs, tb, max_insns);
}
void nios2_cpu_dump_state(CPUState *cs, FILE *f, int flags)