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authorLluís Vilanova <vilanova@ac.upc.edu>2017-07-14 12:34:18 +0300
committerRichard Henderson <richard.henderson@linaro.org>2017-09-06 08:06:47 -0700
commit13189a9080b35b13af23f2be4806fa0cdbb31af3 (patch)
tree08f0fc8c57c5c472fbcab8dd2c00ee07714bd321 /target
parent0cb56b373da70047979b61b042f59aaff4012e1b (diff)
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target/arm: [tcg] Port to translate_insn
Incrementally paves the way towards using the generic instruction translation loop. Reviewed-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Message-Id: <150002485863.22386.13949856269576226529.stgit@frigg.lan> [rth: Adjust for translate_insn interface change.] Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'target')
-rw-r--r--target/arm/translate.c165
-rw-r--r--target/arm/translate.h1
2 files changed, 91 insertions, 75 deletions
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 2f5f653..5737299 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -11880,6 +11880,8 @@ static int arm_tr_init_disas_context(DisasContextBase *dcbase,
dc->is_ldex = false;
dc->ss_same_el = false; /* Can't be true since EL_d must be AArch64 */
+ dc->next_page_start =
+ (dc->base.pc_first & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
cpu_F0s = tcg_temp_new_i32();
cpu_F1s = tcg_temp_new_i32();
@@ -11973,14 +11975,93 @@ static bool arm_tr_breakpoint_check(DisasContextBase *dcbase, CPUState *cpu,
return true;
}
+static void arm_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
+{
+ DisasContext *dc = container_of(dcbase, DisasContext, base);
+ CPUARMState *env = cpu->env_ptr;
+
+#ifdef CONFIG_USER_ONLY
+ /* Intercept jump to the magic kernel page. */
+ if (dc->pc >= 0xffff0000) {
+ /* We always get here via a jump, so know we are not in a
+ conditional execution block. */
+ gen_exception_internal(EXCP_KERNEL_TRAP);
+ dc->base.is_jmp = DISAS_NORETURN;
+ return;
+ }
+#endif
+
+ if (dc->ss_active && !dc->pstate_ss) {
+ /* Singlestep state is Active-pending.
+ * If we're in this state at the start of a TB then either
+ * a) we just took an exception to an EL which is being debugged
+ * and this is the first insn in the exception handler
+ * b) debug exceptions were masked and we just unmasked them
+ * without changing EL (eg by clearing PSTATE.D)
+ * In either case we're going to take a swstep exception in the
+ * "did not step an insn" case, and so the syndrome ISV and EX
+ * bits should be zero.
+ */
+ assert(dc->base.num_insns == 1);
+ gen_exception(EXCP_UDEF, syn_swstep(dc->ss_same_el, 0, 0),
+ default_exception_el(dc));
+ dc->base.is_jmp = DISAS_NORETURN;
+ return;
+ }
+
+ if (dc->thumb) {
+ disas_thumb_insn(env, dc);
+ if (dc->condexec_mask) {
+ dc->condexec_cond = (dc->condexec_cond & 0xe)
+ | ((dc->condexec_mask >> 4) & 1);
+ dc->condexec_mask = (dc->condexec_mask << 1) & 0x1f;
+ if (dc->condexec_mask == 0) {
+ dc->condexec_cond = 0;
+ }
+ }
+ } else {
+ unsigned int insn = arm_ldl_code(env, dc->pc, dc->sctlr_b);
+ dc->pc += 4;
+ disas_arm_insn(dc, insn);
+ }
+
+ if (dc->condjmp && !dc->base.is_jmp) {
+ gen_set_label(dc->condlabel);
+ dc->condjmp = 0;
+ }
+
+ if (dc->base.is_jmp == DISAS_NEXT) {
+ /* 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. */
+
+ if (is_singlestepping(dc)) {
+ dc->base.is_jmp = DISAS_TOO_MANY;
+ } else if ((dc->pc >= dc->next_page_start) ||
+ ((dc->pc >= dc->next_page_start - 3) &&
+ insn_crosses_page(env, dc))) {
+ /* We want to stop the TB if the next insn starts in a new page,
+ * or if it spans between this page and the next. This means that
+ * if we're looking at the last halfword in the page we need to
+ * see if it's a 16-bit Thumb insn (which will fit in this TB)
+ * or a 32-bit Thumb insn (which won't).
+ * This is to avoid generating a silly TB with a single 16-bit insn
+ * in it at the end of this page (which would execute correctly
+ * but isn't very efficient).
+ */
+ dc->base.is_jmp = DISAS_TOO_MANY;
+ }
+ }
+
+ dc->base.pc_next = dc->pc;
+}
+
/* generate intermediate code for basic block 'tb'. */
void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
{
- CPUARMState *env = cs->env_ptr;
DisasContext dc1, *dc = &dc1;
- target_ulong next_page_start;
int max_insns;
- bool end_of_page;
/* generate intermediate code */
@@ -11999,7 +12080,6 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
dc->base.num_insns = 0;
dc->base.singlestep_enabled = cs->singlestep_enabled;
- next_page_start = (dc->base.pc_first & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
max_insns = tb->cflags & CF_COUNT_MASK;
if (max_insns == 0) {
max_insns = CF_COUNT_MASK;
@@ -12036,83 +12116,18 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
gen_io_start();
}
-#ifdef CONFIG_USER_ONLY
- /* Intercept jump to the magic kernel page. */
- if (dc->pc >= 0xffff0000) {
- /* We always get here via a jump, so know we are not in a
- conditional execution block. */
- gen_exception_internal(EXCP_KERNEL_TRAP);
- dc->base.is_jmp = DISAS_NORETURN;
- break;
- }
-#endif
-
- if (dc->ss_active && !dc->pstate_ss) {
- /* Singlestep state is Active-pending.
- * If we're in this state at the start of a TB then either
- * a) we just took an exception to an EL which is being debugged
- * and this is the first insn in the exception handler
- * b) debug exceptions were masked and we just unmasked them
- * without changing EL (eg by clearing PSTATE.D)
- * In either case we're going to take a swstep exception in the
- * "did not step an insn" case, and so the syndrome ISV and EX
- * bits should be zero.
- */
- assert(dc->base.num_insns == 1);
- gen_exception(EXCP_UDEF, syn_swstep(dc->ss_same_el, 0, 0),
- default_exception_el(dc));
- dc->base.is_jmp = DISAS_NORETURN;
- break;
- }
-
- if (dc->thumb) {
- disas_thumb_insn(env, dc);
- if (dc->condexec_mask) {
- dc->condexec_cond = (dc->condexec_cond & 0xe)
- | ((dc->condexec_mask >> 4) & 1);
- dc->condexec_mask = (dc->condexec_mask << 1) & 0x1f;
- if (dc->condexec_mask == 0) {
- dc->condexec_cond = 0;
- }
- }
- } else {
- unsigned int insn = arm_ldl_code(env, dc->pc, dc->sctlr_b);
- dc->pc += 4;
- disas_arm_insn(dc, insn);
- }
-
- if (dc->condjmp && !dc->base.is_jmp) {
- gen_set_label(dc->condlabel);
- dc->condjmp = 0;
- }
+ arm_tr_translate_insn(&dc->base, cs);
if (tcg_check_temp_count()) {
fprintf(stderr, "TCG temporary leak before "TARGET_FMT_lx"\n",
dc->pc);
}
- /* 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. */
-
- /* We want to stop the TB if the next insn starts in a new page,
- * or if it spans between this page and the next. This means that
- * if we're looking at the last halfword in the page we need to
- * see if it's a 16-bit Thumb insn (which will fit in this TB)
- * or a 32-bit Thumb insn (which won't).
- * This is to avoid generating a silly TB with a single 16-bit insn
- * in it at the end of this page (which would execute correctly
- * but isn't very efficient).
- */
- end_of_page = (dc->pc >= next_page_start) ||
- ((dc->pc >= next_page_start - 3) && insn_crosses_page(env, dc));
-
- } while (!dc->base.is_jmp && !tcg_op_buf_full() &&
- !is_singlestepping(dc) &&
- !singlestep &&
- !end_of_page &&
- dc->base.num_insns < max_insns);
+ if (!dc->base.is_jmp && (tcg_op_buf_full() || singlestep ||
+ dc->base.num_insns >= max_insns)) {
+ dc->base.is_jmp = DISAS_TOO_MANY;
+ }
+ } while (!dc->base.is_jmp);
if (tb->cflags & CF_LAST_IO) {
if (dc->condjmp) {
diff --git a/target/arm/translate.h b/target/arm/translate.h
index a804ff6..e8dcec5 100644
--- a/target/arm/translate.h
+++ b/target/arm/translate.h
@@ -9,6 +9,7 @@ typedef struct DisasContext {
DisasContextBase base;
target_ulong pc;
+ target_ulong next_page_start;
uint32_t insn;
/* Nonzero if this instruction has been conditionally skipped. */
int condjmp;