Revision 750813cf target-arm/translate-a64.c
| b/target-arm/translate-a64.c | ||
|---|---|---|
| 2483 | 2483 |
} |
| 2484 | 2484 |
} |
| 2485 | 2485 |
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| 2486 |
/* Conditional compare (immediate) */ |
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| 2487 |
static void disas_cc_imm(DisasContext *s, uint32_t insn) |
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/* C3.5.4 - C3.5.5 Conditional compare (immediate / register) |
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| 2487 |
* 31 30 29 28 27 26 25 24 23 22 21 20 16 15 12 11 10 9 5 4 3 0 |
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* +--+--+--+------------------------+--------+------+----+--+------+--+-----+ |
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* |sf|op| S| 1 1 0 1 0 0 1 0 |imm5/rm | cond |i/r |o2| Rn |o3|nzcv | |
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* +--+--+--+------------------------+--------+------+----+--+------+--+-----+ |
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| 2491 |
* [1] y [0] [0] |
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| 2492 |
*/ |
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| 2493 |
static void disas_cc(DisasContext *s, uint32_t insn) |
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| 2488 | 2494 |
{
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| 2489 |
unsupported_encoding(s, insn); |
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| 2490 |
} |
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| 2495 |
unsigned int sf, op, y, cond, rn, nzcv, is_imm; |
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| 2496 |
int label_continue = -1; |
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| 2497 |
TCGv_i64 tcg_tmp, tcg_y, tcg_rn; |
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| 2491 | 2498 |
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| 2492 |
/* Conditional compare (register) */ |
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| 2493 |
static void disas_cc_reg(DisasContext *s, uint32_t insn) |
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{
|
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| 2495 |
unsupported_encoding(s, insn); |
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| 2499 |
if (!extract32(insn, 29, 1)) {
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| 2500 |
unallocated_encoding(s); |
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| 2501 |
return; |
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| 2502 |
} |
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| 2503 |
if (insn & (1 << 10 | 1 << 4)) {
|
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| 2504 |
unallocated_encoding(s); |
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| 2505 |
return; |
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| 2506 |
} |
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| 2507 |
sf = extract32(insn, 31, 1); |
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| 2508 |
op = extract32(insn, 30, 1); |
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| 2509 |
is_imm = extract32(insn, 11, 1); |
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| 2510 |
y = extract32(insn, 16, 5); /* y = rm (reg) or imm5 (imm) */ |
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| 2511 |
cond = extract32(insn, 12, 4); |
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| 2512 |
rn = extract32(insn, 5, 5); |
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| 2513 |
nzcv = extract32(insn, 0, 4); |
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| 2514 |
|
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| 2515 |
if (cond < 0x0e) { /* not always */
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| 2516 |
int label_match = gen_new_label(); |
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| 2517 |
label_continue = gen_new_label(); |
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| 2518 |
arm_gen_test_cc(cond, label_match); |
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| 2519 |
/* nomatch: */ |
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| 2520 |
tcg_tmp = tcg_temp_new_i64(); |
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| 2521 |
tcg_gen_movi_i64(tcg_tmp, nzcv << 28); |
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| 2522 |
gen_set_nzcv(tcg_tmp); |
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| 2523 |
tcg_temp_free_i64(tcg_tmp); |
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| 2524 |
tcg_gen_br(label_continue); |
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| 2525 |
gen_set_label(label_match); |
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| 2526 |
} |
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| 2527 |
/* match, or condition is always */ |
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| 2528 |
if (is_imm) {
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| 2529 |
tcg_y = new_tmp_a64(s); |
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| 2530 |
tcg_gen_movi_i64(tcg_y, y); |
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| 2531 |
} else {
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| 2532 |
tcg_y = cpu_reg(s, y); |
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| 2533 |
} |
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| 2534 |
tcg_rn = cpu_reg(s, rn); |
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| 2535 |
|
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| 2536 |
tcg_tmp = tcg_temp_new_i64(); |
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| 2537 |
if (op) {
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gen_sub_CC(sf, tcg_tmp, tcg_rn, tcg_y); |
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| 2539 |
} else {
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gen_add_CC(sf, tcg_tmp, tcg_rn, tcg_y); |
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| 2541 |
} |
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| 2542 |
tcg_temp_free_i64(tcg_tmp); |
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| 2543 |
|
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| 2544 |
if (cond < 0x0e) { /* continue */
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| 2545 |
gen_set_label(label_continue); |
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| 2546 |
} |
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| 2496 | 2547 |
} |
| 2497 | 2548 |
|
| 2498 | 2549 |
/* C3.5.6 Conditional select |
| ... | ... | |
| 2846 | 2897 |
disas_adc_sbc(s, insn); |
| 2847 | 2898 |
break; |
| 2848 | 2899 |
case 0x2: /* Conditional compare */ |
| 2849 |
if (insn & (1 << 11)) { /* (immediate) */
|
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| 2850 |
disas_cc_imm(s, insn); |
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| 2851 |
} else { /* (register) */
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| 2852 |
disas_cc_reg(s, insn); |
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| 2853 |
} |
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| 2900 |
disas_cc(s, insn); /* both imm and reg forms */ |
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| 2854 | 2901 |
break; |
| 2855 | 2902 |
case 0x4: /* Conditional select */ |
| 2856 | 2903 |
disas_cond_select(s, insn); |
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