4
* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
6
* This library is free software; you can redistribute it and/or
7
* modify it under the terms of the GNU Lesser General Public
8
* License as published by the Free Software Foundation; either
9
* version 2 of the License, or (at your option) any later version.
11
* This library is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14
* Lesser General Public License for more details.
16
* You should have received a copy of the GNU Lesser General Public
17
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
28
#include "translate.h"
29
#include "qemu/host-utils.h"
31
#include "exec/gen-icount.h"
37
static TCGv_i64 cpu_X[32];
38
static TCGv_i64 cpu_pc;
39
static TCGv_i32 pstate;
41
static const char *regnames[] = {
42
"x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
43
"x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
44
"x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23",
45
"x24", "x25", "x26", "x27", "x28", "x29", "lr", "sp"
48
/* initialize TCG globals. */
49
void a64_translate_init(void)
53
cpu_pc = tcg_global_mem_new_i64(TCG_AREG0,
54
offsetof(CPUARMState, pc),
56
for (i = 0; i < 32; i++) {
57
cpu_X[i] = tcg_global_mem_new_i64(TCG_AREG0,
58
offsetof(CPUARMState, xregs[i]),
62
pstate = tcg_global_mem_new_i32(TCG_AREG0,
63
offsetof(CPUARMState, pstate),
67
void aarch64_cpu_dump_state(CPUState *cs, FILE *f,
68
fprintf_function cpu_fprintf, int flags)
70
ARMCPU *cpu = ARM_CPU(cs);
71
CPUARMState *env = &cpu->env;
72
uint32_t psr = pstate_read(env);
75
cpu_fprintf(f, "PC=%016"PRIx64" SP=%016"PRIx64"\n",
76
env->pc, env->xregs[31]);
77
for (i = 0; i < 31; i++) {
78
cpu_fprintf(f, "X%02d=%016"PRIx64, i, env->xregs[i]);
85
cpu_fprintf(f, "PSTATE=%08x (flags %c%c%c%c)\n",
87
psr & PSTATE_N ? 'N' : '-',
88
psr & PSTATE_Z ? 'Z' : '-',
89
psr & PSTATE_C ? 'C' : '-',
90
psr & PSTATE_V ? 'V' : '-');
94
void gen_a64_set_pc_im(uint64_t val)
96
tcg_gen_movi_i64(cpu_pc, val);
99
static void gen_exception(int excp)
101
TCGv_i32 tmp = tcg_temp_new_i32();
102
tcg_gen_movi_i32(tmp, excp);
103
gen_helper_exception(cpu_env, tmp);
104
tcg_temp_free_i32(tmp);
107
static void gen_exception_insn(DisasContext *s, int offset, int excp)
109
gen_a64_set_pc_im(s->pc - offset);
111
s->is_jmp = DISAS_EXC;
114
static inline bool use_goto_tb(DisasContext *s, int n, uint64_t dest)
116
/* No direct tb linking with singlestep or deterministic io */
117
if (s->singlestep_enabled || (s->tb->cflags & CF_LAST_IO)) {
121
/* Only link tbs from inside the same guest page */
122
if ((s->tb->pc & TARGET_PAGE_MASK) != (dest & TARGET_PAGE_MASK)) {
129
static inline void gen_goto_tb(DisasContext *s, int n, uint64_t dest)
131
TranslationBlock *tb;
134
if (use_goto_tb(s, n, dest)) {
136
gen_a64_set_pc_im(dest);
137
tcg_gen_exit_tb((tcg_target_long)tb + n);
138
s->is_jmp = DISAS_TB_JUMP;
140
gen_a64_set_pc_im(dest);
141
if (s->singlestep_enabled) {
142
gen_exception(EXCP_DEBUG);
145
s->is_jmp = DISAS_JUMP;
149
static void unallocated_encoding(DisasContext *s)
151
gen_exception_insn(s, 4, EXCP_UDEF);
154
#define unsupported_encoding(s, insn) \
156
qemu_log_mask(LOG_UNIMP, \
157
"%s:%d: unsupported instruction encoding 0x%08x " \
158
"at pc=%016" PRIx64 "\n", \
159
__FILE__, __LINE__, insn, s->pc - 4); \
160
unallocated_encoding(s); \
163
static void init_tmp_a64_array(DisasContext *s)
165
#ifdef CONFIG_DEBUG_TCG
167
for (i = 0; i < ARRAY_SIZE(s->tmp_a64); i++) {
168
TCGV_UNUSED_I64(s->tmp_a64[i]);
171
s->tmp_a64_count = 0;
174
static void free_tmp_a64(DisasContext *s)
177
for (i = 0; i < s->tmp_a64_count; i++) {
178
tcg_temp_free_i64(s->tmp_a64[i]);
180
init_tmp_a64_array(s);
183
static TCGv_i64 new_tmp_a64(DisasContext *s)
185
assert(s->tmp_a64_count < TMP_A64_MAX);
186
return s->tmp_a64[s->tmp_a64_count++] = tcg_temp_new_i64();
189
static TCGv_i64 new_tmp_a64_zero(DisasContext *s)
191
TCGv_i64 t = new_tmp_a64(s);
192
tcg_gen_movi_i64(t, 0);
196
static TCGv_i64 cpu_reg(DisasContext *s, int reg)
199
return new_tmp_a64_zero(s);
206
* the instruction disassembly implemented here matches
207
* the instruction encoding classifications in chapter 3 (C3)
208
* of the ARM Architecture Reference Manual (DDI0487A_a)
211
/* C3.2.7 Unconditional branch (immediate)
213
* +----+-----------+-------------------------------------+
214
* | op | 0 0 1 0 1 | imm26 |
215
* +----+-----------+-------------------------------------+
217
static void disas_uncond_b_imm(DisasContext *s, uint32_t insn)
219
uint64_t addr = s->pc + sextract32(insn, 0, 26) * 4 - 4;
221
if (insn & (1 << 31)) {
222
/* C5.6.26 BL Branch with link */
223
tcg_gen_movi_i64(cpu_reg(s, 30), s->pc);
226
/* C5.6.20 B Branch / C5.6.26 BL Branch with link */
227
gen_goto_tb(s, 0, addr);
230
/* Compare & branch (immediate) */
231
static void disas_comp_b_imm(DisasContext *s, uint32_t insn)
233
unsupported_encoding(s, insn);
236
/* C3.2.5 Test & branch (immediate)
237
* 31 30 25 24 23 19 18 5 4 0
238
* +----+-------------+----+-------+-------------+------+
239
* | b5 | 0 1 1 0 1 1 | op | b40 | imm14 | Rt |
240
* +----+-------------+----+-------+-------------+------+
242
static void disas_test_b_imm(DisasContext *s, uint32_t insn)
244
unsigned int bit_pos, op, rt;
249
bit_pos = (extract32(insn, 31, 1) << 5) | extract32(insn, 19, 5);
250
op = extract32(insn, 24, 1); /* 0: TBZ; 1: TBNZ */
251
addr = s->pc + sextract32(insn, 5, 14) * 4 - 4;
252
rt = extract32(insn, 0, 5);
254
tcg_cmp = tcg_temp_new_i64();
255
tcg_gen_andi_i64(tcg_cmp, cpu_reg(s, rt), (1ULL << bit_pos));
256
label_match = gen_new_label();
257
tcg_gen_brcondi_i64(op ? TCG_COND_NE : TCG_COND_EQ,
258
tcg_cmp, 0, label_match);
259
tcg_temp_free_i64(tcg_cmp);
260
gen_goto_tb(s, 0, s->pc);
261
gen_set_label(label_match);
262
gen_goto_tb(s, 1, addr);
265
/* C3.2.2 / C5.6.19 Conditional branch (immediate)
266
* 31 25 24 23 5 4 3 0
267
* +---------------+----+---------------------+----+------+
268
* | 0 1 0 1 0 1 0 | o1 | imm19 | o0 | cond |
269
* +---------------+----+---------------------+----+------+
271
static void disas_cond_b_imm(DisasContext *s, uint32_t insn)
276
if ((insn & (1 << 4)) || (insn & (1 << 24))) {
277
unallocated_encoding(s);
280
addr = s->pc + sextract32(insn, 5, 19) * 4 - 4;
281
cond = extract32(insn, 0, 4);
284
/* genuinely conditional branches */
285
int label_match = gen_new_label();
286
arm_gen_test_cc(cond, label_match);
287
gen_goto_tb(s, 0, s->pc);
288
gen_set_label(label_match);
289
gen_goto_tb(s, 1, addr);
291
/* 0xe and 0xf are both "always" conditions */
292
gen_goto_tb(s, 0, addr);
297
static void handle_hint(DisasContext *s, uint32_t insn,
298
unsigned int op1, unsigned int op2, unsigned int crm)
300
unsigned int selector = crm << 3 | op2;
303
unallocated_encoding(s);
315
/* we treat all as NOP at least for now */
318
/* default specified as NOP equivalent */
323
/* CLREX, DSB, DMB, ISB */
324
static void handle_sync(DisasContext *s, uint32_t insn,
325
unsigned int op1, unsigned int op2, unsigned int crm)
328
unallocated_encoding(s);
334
unsupported_encoding(s, insn);
339
/* We don't emulate caches so barriers are no-ops */
342
unallocated_encoding(s);
347
/* C5.6.130 MSR (immediate) - move immediate to processor state field */
348
static void handle_msr_i(DisasContext *s, uint32_t insn,
349
unsigned int op1, unsigned int op2, unsigned int crm)
351
unsupported_encoding(s, insn);
355
static void handle_sys(DisasContext *s, uint32_t insn, unsigned int l,
356
unsigned int op1, unsigned int op2,
357
unsigned int crn, unsigned int crm, unsigned int rt)
359
unsupported_encoding(s, insn);
362
/* C5.6.129 MRS - move from system register */
363
static void handle_mrs(DisasContext *s, uint32_t insn, unsigned int op0,
364
unsigned int op1, unsigned int op2,
365
unsigned int crn, unsigned int crm, unsigned int rt)
367
unsupported_encoding(s, insn);
370
/* C5.6.131 MSR (register) - move to system register */
371
static void handle_msr(DisasContext *s, uint32_t insn, unsigned int op0,
372
unsigned int op1, unsigned int op2,
373
unsigned int crn, unsigned int crm, unsigned int rt)
375
unsupported_encoding(s, insn);
379
* 31 22 21 20 19 18 16 15 12 11 8 7 5 4 0
380
* +---------------------+---+-----+-----+-------+-------+-----+------+
381
* | 1 1 0 1 0 1 0 1 0 0 | L | op0 | op1 | CRn | CRm | op2 | Rt |
382
* +---------------------+---+-----+-----+-------+-------+-----+------+
384
static void disas_system(DisasContext *s, uint32_t insn)
386
unsigned int l, op0, op1, crn, crm, op2, rt;
387
l = extract32(insn, 21, 1);
388
op0 = extract32(insn, 19, 2);
389
op1 = extract32(insn, 16, 3);
390
crn = extract32(insn, 12, 4);
391
crm = extract32(insn, 8, 4);
392
op2 = extract32(insn, 5, 3);
393
rt = extract32(insn, 0, 5);
397
unallocated_encoding(s);
401
case 2: /* C5.6.68 HINT */
402
handle_hint(s, insn, op1, op2, crm);
404
case 3: /* CLREX, DSB, DMB, ISB */
405
handle_sync(s, insn, op1, op2, crm);
407
case 4: /* C5.6.130 MSR (immediate) */
408
handle_msr_i(s, insn, op1, op2, crm);
411
unallocated_encoding(s);
419
handle_sys(s, insn, l, op1, op2, crn, crm, rt);
420
} else if (l) { /* op0 > 1 */
421
/* C5.6.129 MRS - move from system register */
422
handle_mrs(s, insn, op0, op1, op2, crn, crm, rt);
424
/* C5.6.131 MSR (register) - move to system register */
425
handle_msr(s, insn, op0, op1, op2, crn, crm, rt);
429
/* Exception generation */
430
static void disas_exc(DisasContext *s, uint32_t insn)
432
unsupported_encoding(s, insn);
435
/* C3.2.7 Unconditional branch (register)
436
* 31 25 24 21 20 16 15 10 9 5 4 0
437
* +---------------+-------+-------+-------+------+-------+
438
* | 1 1 0 1 0 1 1 | opc | op2 | op3 | Rn | op4 |
439
* +---------------+-------+-------+-------+------+-------+
441
static void disas_uncond_b_reg(DisasContext *s, uint32_t insn)
443
unsigned int opc, op2, op3, rn, op4;
445
opc = extract32(insn, 21, 4);
446
op2 = extract32(insn, 16, 5);
447
op3 = extract32(insn, 10, 6);
448
rn = extract32(insn, 5, 5);
449
op4 = extract32(insn, 0, 5);
451
if (op4 != 0x0 || op3 != 0x0 || op2 != 0x1f) {
452
unallocated_encoding(s);
461
tcg_gen_movi_i64(cpu_reg(s, 30), s->pc);
466
unallocated_encoding(s);
468
unsupported_encoding(s, insn);
472
unallocated_encoding(s);
476
tcg_gen_mov_i64(cpu_pc, cpu_reg(s, rn));
477
s->is_jmp = DISAS_JUMP;
480
/* C3.2 Branches, exception generating and system instructions */
481
static void disas_b_exc_sys(DisasContext *s, uint32_t insn)
483
switch (extract32(insn, 25, 7)) {
484
case 0x0a: case 0x0b:
485
case 0x4a: case 0x4b: /* Unconditional branch (immediate) */
486
disas_uncond_b_imm(s, insn);
488
case 0x1a: case 0x5a: /* Compare & branch (immediate) */
489
disas_comp_b_imm(s, insn);
491
case 0x1b: case 0x5b: /* Test & branch (immediate) */
492
disas_test_b_imm(s, insn);
494
case 0x2a: /* Conditional branch (immediate) */
495
disas_cond_b_imm(s, insn);
497
case 0x6a: /* Exception generation / System */
498
if (insn & (1 << 24)) {
499
disas_system(s, insn);
504
case 0x6b: /* Unconditional branch (register) */
505
disas_uncond_b_reg(s, insn);
508
unallocated_encoding(s);
513
/* Load/store exclusive */
514
static void disas_ldst_excl(DisasContext *s, uint32_t insn)
516
unsupported_encoding(s, insn);
519
/* Load register (literal) */
520
static void disas_ld_lit(DisasContext *s, uint32_t insn)
522
unsupported_encoding(s, insn);
525
/* Load/store pair (all forms) */
526
static void disas_ldst_pair(DisasContext *s, uint32_t insn)
528
unsupported_encoding(s, insn);
531
/* Load/store register (all forms) */
532
static void disas_ldst_reg(DisasContext *s, uint32_t insn)
534
unsupported_encoding(s, insn);
537
/* AdvSIMD load/store multiple structures */
538
static void disas_ldst_multiple_struct(DisasContext *s, uint32_t insn)
540
unsupported_encoding(s, insn);
543
/* AdvSIMD load/store single structure */
544
static void disas_ldst_single_struct(DisasContext *s, uint32_t insn)
546
unsupported_encoding(s, insn);
549
/* C3.3 Loads and stores */
550
static void disas_ldst(DisasContext *s, uint32_t insn)
552
switch (extract32(insn, 24, 6)) {
553
case 0x08: /* Load/store exclusive */
554
disas_ldst_excl(s, insn);
556
case 0x18: case 0x1c: /* Load register (literal) */
557
disas_ld_lit(s, insn);
559
case 0x28: case 0x29:
560
case 0x2c: case 0x2d: /* Load/store pair (all forms) */
561
disas_ldst_pair(s, insn);
563
case 0x38: case 0x39:
564
case 0x3c: case 0x3d: /* Load/store register (all forms) */
565
disas_ldst_reg(s, insn);
567
case 0x0c: /* AdvSIMD load/store multiple structures */
568
disas_ldst_multiple_struct(s, insn);
570
case 0x0d: /* AdvSIMD load/store single structure */
571
disas_ldst_single_struct(s, insn);
574
unallocated_encoding(s);
579
/* PC-rel. addressing */
580
static void disas_pc_rel_adr(DisasContext *s, uint32_t insn)
582
unsupported_encoding(s, insn);
585
/* Add/subtract (immediate) */
586
static void disas_add_sub_imm(DisasContext *s, uint32_t insn)
588
unsupported_encoding(s, insn);
591
/* Logical (immediate) */
592
static void disas_logic_imm(DisasContext *s, uint32_t insn)
594
unsupported_encoding(s, insn);
597
/* Move wide (immediate) */
598
static void disas_movw_imm(DisasContext *s, uint32_t insn)
600
unsupported_encoding(s, insn);
604
static void disas_bitfield(DisasContext *s, uint32_t insn)
606
unsupported_encoding(s, insn);
610
static void disas_extract(DisasContext *s, uint32_t insn)
612
unsupported_encoding(s, insn);
615
/* C3.4 Data processing - immediate */
616
static void disas_data_proc_imm(DisasContext *s, uint32_t insn)
618
switch (extract32(insn, 23, 6)) {
619
case 0x20: case 0x21: /* PC-rel. addressing */
620
disas_pc_rel_adr(s, insn);
622
case 0x22: case 0x23: /* Add/subtract (immediate) */
623
disas_add_sub_imm(s, insn);
625
case 0x24: /* Logical (immediate) */
626
disas_logic_imm(s, insn);
628
case 0x25: /* Move wide (immediate) */
629
disas_movw_imm(s, insn);
631
case 0x26: /* Bitfield */
632
disas_bitfield(s, insn);
634
case 0x27: /* Extract */
635
disas_extract(s, insn);
638
unallocated_encoding(s);
643
/* Logical (shifted register) */
644
static void disas_logic_reg(DisasContext *s, uint32_t insn)
646
unsupported_encoding(s, insn);
649
/* Add/subtract (extended register) */
650
static void disas_add_sub_ext_reg(DisasContext *s, uint32_t insn)
652
unsupported_encoding(s, insn);
655
/* Add/subtract (shifted register) */
656
static void disas_add_sub_reg(DisasContext *s, uint32_t insn)
658
unsupported_encoding(s, insn);
661
/* Data-processing (3 source) */
662
static void disas_data_proc_3src(DisasContext *s, uint32_t insn)
664
unsupported_encoding(s, insn);
667
/* Add/subtract (with carry) */
668
static void disas_adc_sbc(DisasContext *s, uint32_t insn)
670
unsupported_encoding(s, insn);
673
/* Conditional compare (immediate) */
674
static void disas_cc_imm(DisasContext *s, uint32_t insn)
676
unsupported_encoding(s, insn);
679
/* Conditional compare (register) */
680
static void disas_cc_reg(DisasContext *s, uint32_t insn)
682
unsupported_encoding(s, insn);
685
/* Conditional select */
686
static void disas_cond_select(DisasContext *s, uint32_t insn)
688
unsupported_encoding(s, insn);
691
/* Data-processing (1 source) */
692
static void disas_data_proc_1src(DisasContext *s, uint32_t insn)
694
unsupported_encoding(s, insn);
697
/* Data-processing (2 source) */
698
static void disas_data_proc_2src(DisasContext *s, uint32_t insn)
700
unsupported_encoding(s, insn);
703
/* C3.5 Data processing - register */
704
static void disas_data_proc_reg(DisasContext *s, uint32_t insn)
706
switch (extract32(insn, 24, 5)) {
707
case 0x0a: /* Logical (shifted register) */
708
disas_logic_reg(s, insn);
710
case 0x0b: /* Add/subtract */
711
if (insn & (1 << 21)) { /* (extended register) */
712
disas_add_sub_ext_reg(s, insn);
714
disas_add_sub_reg(s, insn);
717
case 0x1b: /* Data-processing (3 source) */
718
disas_data_proc_3src(s, insn);
721
switch (extract32(insn, 21, 3)) {
722
case 0x0: /* Add/subtract (with carry) */
723
disas_adc_sbc(s, insn);
725
case 0x2: /* Conditional compare */
726
if (insn & (1 << 11)) { /* (immediate) */
727
disas_cc_imm(s, insn);
728
} else { /* (register) */
729
disas_cc_reg(s, insn);
732
case 0x4: /* Conditional select */
733
disas_cond_select(s, insn);
735
case 0x6: /* Data-processing */
736
if (insn & (1 << 30)) { /* (1 source) */
737
disas_data_proc_1src(s, insn);
738
} else { /* (2 source) */
739
disas_data_proc_2src(s, insn);
743
unallocated_encoding(s);
748
unallocated_encoding(s);
753
/* C3.6 Data processing - SIMD and floating point */
754
static void disas_data_proc_simd_fp(DisasContext *s, uint32_t insn)
756
unsupported_encoding(s, insn);
759
/* C3.1 A64 instruction index by encoding */
760
static void disas_a64_insn(CPUARMState *env, DisasContext *s)
764
insn = arm_ldl_code(env, s->pc, s->bswap_code);
768
switch (extract32(insn, 25, 4)) {
769
case 0x0: case 0x1: case 0x2: case 0x3: /* UNALLOCATED */
770
unallocated_encoding(s);
772
case 0x8: case 0x9: /* Data processing - immediate */
773
disas_data_proc_imm(s, insn);
775
case 0xa: case 0xb: /* Branch, exception generation and system insns */
776
disas_b_exc_sys(s, insn);
781
case 0xe: /* Loads and stores */
785
case 0xd: /* Data processing - register */
786
disas_data_proc_reg(s, insn);
789
case 0xf: /* Data processing - SIMD and floating point */
790
disas_data_proc_simd_fp(s, insn);
793
assert(FALSE); /* all 15 cases should be handled above */
797
/* if we allocated any temporaries, free them here */
801
void gen_intermediate_code_internal_a64(ARMCPU *cpu,
802
TranslationBlock *tb,
805
CPUState *cs = CPU(cpu);
806
CPUARMState *env = &cpu->env;
807
DisasContext dc1, *dc = &dc1;
809
uint16_t *gen_opc_end;
811
target_ulong pc_start;
812
target_ulong next_page_start;
820
gen_opc_end = tcg_ctx.gen_opc_buf + OPC_MAX_SIZE;
822
dc->is_jmp = DISAS_NEXT;
824
dc->singlestep_enabled = cs->singlestep_enabled;
830
dc->condexec_mask = 0;
831
dc->condexec_cond = 0;
832
#if !defined(CONFIG_USER_ONLY)
839
init_tmp_a64_array(dc);
841
next_page_start = (pc_start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
844
max_insns = tb->cflags & CF_COUNT_MASK;
845
if (max_insns == 0) {
846
max_insns = CF_COUNT_MASK;
851
tcg_clear_temp_count();
854
if (unlikely(!QTAILQ_EMPTY(&env->breakpoints))) {
855
QTAILQ_FOREACH(bp, &env->breakpoints, entry) {
856
if (bp->pc == dc->pc) {
857
gen_exception_insn(dc, 0, EXCP_DEBUG);
858
/* Advance PC so that clearing the breakpoint will
859
invalidate this TB. */
861
goto done_generating;
867
j = tcg_ctx.gen_opc_ptr - tcg_ctx.gen_opc_buf;
871
tcg_ctx.gen_opc_instr_start[lj++] = 0;
874
tcg_ctx.gen_opc_pc[lj] = dc->pc;
875
tcg_ctx.gen_opc_instr_start[lj] = 1;
876
tcg_ctx.gen_opc_icount[lj] = num_insns;
879
if (num_insns + 1 == max_insns && (tb->cflags & CF_LAST_IO)) {
883
if (unlikely(qemu_loglevel_mask(CPU_LOG_TB_OP | CPU_LOG_TB_OP_OPT))) {
884
tcg_gen_debug_insn_start(dc->pc);
887
disas_a64_insn(env, dc);
889
if (tcg_check_temp_count()) {
890
fprintf(stderr, "TCG temporary leak before "TARGET_FMT_lx"\n",
894
/* Translation stops when a conditional branch is encountered.
895
* Otherwise the subsequent code could get translated several times.
896
* Also stop translation when a page boundary is reached. This
897
* ensures prefetch aborts occur at the right place.
900
} while (!dc->is_jmp && tcg_ctx.gen_opc_ptr < gen_opc_end &&
901
!cs->singlestep_enabled &&
903
dc->pc < next_page_start &&
904
num_insns < max_insns);
906
if (tb->cflags & CF_LAST_IO) {
910
if (unlikely(cs->singlestep_enabled) && dc->is_jmp != DISAS_EXC) {
911
/* Note that this means single stepping WFI doesn't halt the CPU.
912
* For conditional branch insns this is harmless unreachable code as
913
* gen_goto_tb() has already handled emitting the debug exception
914
* (and thus a tb-jump is not possible when singlestepping).
916
assert(dc->is_jmp != DISAS_TB_JUMP);
917
if (dc->is_jmp != DISAS_JUMP) {
918
gen_a64_set_pc_im(dc->pc);
920
gen_exception(EXCP_DEBUG);
922
switch (dc->is_jmp) {
924
gen_goto_tb(dc, 1, dc->pc);
929
/* indicate that the hash table must be used to find the next TB */
937
/* This is a special case because we don't want to just halt the CPU
938
* if trying to debug across a WFI.
940
gen_helper_wfi(cpu_env);
946
gen_tb_end(tb, num_insns);
947
*tcg_ctx.gen_opc_ptr = INDEX_op_end;
950
if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM)) {
951
qemu_log("----------------\n");
952
qemu_log("IN: %s\n", lookup_symbol(pc_start));
953
log_target_disas(env, pc_start, dc->pc - pc_start,
954
dc->thumb | (dc->bswap_code << 1));
959
j = tcg_ctx.gen_opc_ptr - tcg_ctx.gen_opc_buf;
962
tcg_ctx.gen_opc_instr_start[lj++] = 0;
965
tb->size = dc->pc - pc_start;
966
tb->icount = num_insns;