1 /* architecture-dependent code generation for x86_64 */
15 /* x86_64 registers */
44 #define MIN(a, b) ((a) < (b) ? (a) : (b))
45 #define ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1))
47 int tmpregs
[] = {0, 7, 6, 2, 1, 8, 9, 10, 11, 3, 12, 13, 14, 15};
48 int argregs
[] = {7, 6, 2, 1, 8, 9};
50 #define OP2(o2, o1) (0x010000 | ((o2) << 8) | (o1))
51 #define O2(op) (((op) >> 8) & 0xff)
52 #define O1(op) ((op) & 0xff)
53 #define MODRM(m, r1, r2) ((m) << 6 | (r1) << 3 | (r2))
54 #define REX(r1, r2) (0x48 | (((r1) & 8) >> 1) | (((r2) & 8) >> 3))
56 static void putint(char *s
, long n
, int l
)
64 static void op_x(int op
, int r1
, int r2
, int bt
)
82 oi(sz
== 1 ? O1(op
) & ~0x1 : O1(op
), 1);
87 /* op_*(): r=reg, m=mem, i=imm, s=sym */
88 static void op_rm(int op
, int src
, int base
, int off
, int bt
)
90 int dis
= off
== (char) off
? 1 : 4;
91 int mod
= dis
== 4 ? 2 : 1;
92 if (!off
&& (base
& 7) != R_RBP
)
94 op_x(op
, src
, base
, bt
);
95 oi(MODRM(mod
, src
& 0x07, base
& 0x07), 1);
96 if ((base
& 7) == R_RSP
)
102 static void op_rr(int op
, int src
, int dst
, int bt
)
104 op_x(op
, src
, dst
, bt
);
105 oi(MODRM(3, src
& 0x07, dst
& 0x07), 1);
108 #define movrx_bt(bt) (((bt) == 4) ? 4 : LONGSZ)
110 static int movrx_op(int bt
, int mov
)
114 return bt
& BT_SIGNED
? I_MOVSXD
: mov
;
116 return OP2(0x0f, bt
& BT_SIGNED
? 0xbf : 0xb7);
118 return OP2(0x0f, bt
& BT_SIGNED
? 0xbe : 0xb6);
122 static void mov_r2r(int rd
, int r1
, unsigned bt
)
124 if (rd
!= r1
|| BT_SZ(bt
) != LONGSZ
)
125 op_rr(movrx_op(bt
, I_MOVR
), rd
, r1
, movrx_bt(bt
));
128 int i_imm(int op
, long imm
)
130 if ((op
& 0xf0) == 0x20)
132 return imm
<= 127 && imm
>= -128;
135 static void i_push(int reg
)
137 op_x(I_PUSH
| (reg
& 0x7), 0, reg
, LONGSZ
);
140 static void i_pop(int reg
)
142 op_x(I_POP
| (reg
& 0x7), 0, reg
, LONGSZ
);
145 void i_mov(int rd
, int rn
)
147 op_rr(movrx_op(LONGSZ
, I_MOVR
), rd
, rn
, movrx_bt(LONGSZ
));
150 void i_load(int rd
, int rn
, int off
, int bt
)
152 op_rm(movrx_op(bt
, I_MOVR
), rd
, rn
, off
, movrx_bt(bt
));
155 void i_save(int rd
, int rn
, int off
, int bt
)
157 op_rm(I_MOV
, rd
, rn
, off
, bt
);
160 void i_reg(int op
, int *rd
, int *r1
, int *r2
, int *tmp
)
164 *r2
= op
& O_IMM
? 0 : R_TMPS
;
166 if ((op
& 0xf0) == 0x00) /* add */
168 if ((op
& 0xf0) == 0x10) { /* shl */
175 if ((op
& 0xf0) == 0x20) { /* mul */
176 *rd
= (op
& 0xff) == O_MOD
? (1 << R_RDX
) : (1 << R_RAX
);
178 *r2
= R_TMPS
& ~*rd
& ~*r1
;
179 if ((op
& 0xff) == O_DIV
)
180 *r2
&= ~(1 << R_RDX
);
181 *tmp
= (1 << R_RDX
) | (1 << R_RAX
);
184 if ((op
& 0xf0) == 0x30) { /* cmp */
188 if ((op
& 0xf0) == 0x40) { /* uop */
190 if ((op
& 0xff) == O_LNOT
)
194 if ((op
& 0xf0) == 0x50) { /* etc */
205 if (op
== O_SX
|| op
== O_ZX
|| op
== O_MOV
) {
213 static void i_add(int op
, int rd
, int r1
, int r2
)
215 /* opcode for O_ADD, O_SUB, O_AND, O_OR, O_XOR */
216 static int rx
[] = {0003, 0053, 0043, 0013, 0063};
217 op_rr(rx
[op
& 0x0f], rd
, r2
, LONGSZ
);
220 static void i_add_imm(int op
, int rd
, int rn
, long n
)
222 /* opcode for O_ADD, O_SUB, O_AND, O_OR, O_XOR */
223 static int rx
[] = {0xc0, 0xe8, 0xe0, 0xc8, 0xf0};
224 unsigned char s
[4] = {REX(0, rd
), 0x83, rx
[op
& 0x0f] | (rd
& 7), n
& 0xff};
228 void i_num(int rd
, long n
)
231 op_rr(I_XOR
, rd
, rd
, 4);
234 if (n
< 0 && -n
<= 0xffffffff) {
235 op_rr(I_MOVI
, 0, rd
, LONGSZ
);
239 if (n
> 0 && n
<= 0xffffffff)
241 op_x(I_MOVIR
+ (rd
& 7), 0, rd
, len
);
246 static void i_mul(int rd
, int r1
, int r2
)
250 op_rr(I_MUL
, 4, r2
, LONGSZ
);
253 static void i_div(int op
, int rd
, int r1
, int r2
)
257 op_x(I_CQO
, R_RAX
, R_RDX
, LONGSZ
);
261 op_rr(I_MUL
, op
& O_SIGNED
? 7 : 6, r2
, LONGSZ
);
264 static void i_tst(int rn
, int rm
)
266 op_rr(I_TST
, rn
, rm
, LONGSZ
);
269 static void i_cmp(int rn
, int rm
)
271 op_rr(I_CMP
, rn
, rm
, LONGSZ
);
274 static void i_cmp_imm(int rn
, long n
)
276 unsigned char s
[4] = {REX(0, rn
), 0x83, 0xf8 | rn
, n
& 0xff};
280 static void i_shl(int op
, int rd
, int r1
, int rs
)
283 if ((op
& 0x0f) == 1)
284 sm
= op
& O_SIGNED
? 7 : 5;
285 op_rr(I_SHX
, sm
, rd
, LONGSZ
);
288 static void i_shl_imm(int op
, int rd
, int rn
, long n
)
290 int sm
= (op
& 0x1) ? (op
& O_SIGNED
? 0xf8 : 0xe8) : 0xe0 ;
291 char s
[4] = {REX(0, rn
), 0xc1, sm
| (rn
& 7), n
& 0xff};
295 void i_sym(int rd
, char *sym
, int off
)
297 int sz
= X64_ABS_RL
& OUT_RL32
? 4 : LONGSZ
;
298 if (X64_ABS_RL
& OUT_RLSX
)
299 op_rr(I_MOVI
, 0, rd
, sz
);
301 op_x(I_MOVIR
+ (rd
& 7), 0, rd
, sz
);
303 out_rel(sym
, OUT_CS
| X64_ABS_RL
, cslen
);
307 static void i_neg(int rd
)
309 op_rr(I_NOT
, 3, rd
, LONGSZ
);
312 static void i_not(int rd
)
314 op_rr(I_NOT
, 2, rd
, LONGSZ
);
317 /* for optimizing cmp + tst + jmp to cmp + jmp */
318 #define OPT_ISCMP() (last_set >= 0 && last_set + 7 == cslen)
319 #define OPT_CCOND() (cs[last_set + 1])
321 static long last_set
= -1;
323 static void i_set(int op
, int rd
)
325 /* lt, gt, le, ge, eq, neq */
326 static int ucond
[] = {0x92, 0x97, 0x96, 0x93, 0x94, 0x95};
327 static int scond
[] = {0x9c, 0x9f, 0x9e, 0x9d, 0x94, 0x95};
328 int cond
= op
& O_SIGNED
? scond
[op
& 0x0f] : ucond
[op
& 0x0f];
329 char set
[] = "\x0f\x00\xc0";
332 os(set
, 3); /* setl al */
333 os("\x48\x0f\xb6\xc0", 4); /* movzx rax, al */
336 static void i_lnot(int rd
)
339 cs
[last_set
+ 1] ^= 0x01;
341 char cmp
[] = "\x00\x83\xf8\x00";
344 os(cmp
, 4); /* cmp rax, 0 */
349 static void jx(int x
, int nbytes
)
353 op
[0] = 0x70 | (x
& 0x0f);
354 os(op
, 1); /* jx $addr */
357 os(op
, 2); /* jx $addr */
362 void i_jmp(int rn
, int z
, int nbytes
)
370 int cond
= OPT_CCOND();
372 jx((!z
? cond
: cond
^ 0x01) & ~0x10, nbytes
);
376 jx(z
? 0x84 : 0x85, nbytes
);
379 os(nbytes
== 1 ? "\xeb" : "\xe9", 1); /* jmp $addr */
384 long i_fill(long src
, long dst
, int nbytes
)
390 putint((void *) (cs
+ src
- nbytes
), dst
- src
, nbytes
);
394 static void i_zx(int rd
, int r1
, int bits
)
397 i_shl_imm(O_SHL
, rd
, rd
, LONGSZ
* 8 - bits
);
398 i_shl_imm(O_SHR
, rd
, rd
, LONGSZ
* 8 - bits
);
400 mov_r2r(rd
, r1
, bits
>> 3);
404 static void i_sx(int rd
, int r1
, int bits
)
406 mov_r2r(rd
, r1
, BT_SIGNED
| (bits
>> 3));
409 void i_op(int op
, int rd
, int r1
, int r2
)
411 if ((op
& 0xf0) == 0x00)
412 i_add(op
, r1
, r1
, r2
);
413 if ((op
& 0xf0) == 0x10)
414 i_shl(op
, r1
, r1
, r2
);
415 if ((op
& 0xf0) == 0x20) {
416 if ((op
& 0xff) == O_MUL
)
417 i_mul(R_RAX
, r1
, r2
);
418 if ((op
& 0xff) == O_DIV
)
419 i_div(op
, R_RAX
, r1
, r2
);
420 if ((op
& 0xff) == O_MOD
)
421 i_div(op
, R_RDX
, r1
, r2
);
424 if ((op
& 0xf0) == 0x30) {
429 if ((op
& 0xf0) == 0x40) { /* uop */
430 if ((op
& 0xff) == O_NEG
)
432 if ((op
& 0xff) == O_NOT
)
434 if ((op
& 0xff) == O_LNOT
)
440 static void i_add_anyimm(int rd
, int rn
, long n
)
442 op_rm(I_LEA
, rd
, rn
, n
, LONGSZ
);
445 void i_op_imm(int op
, int rd
, int r1
, long n
)
447 if ((op
& 0xf0) == 0x00) { /* add */
448 if (rd
== r1
&& i_imm(O_ADD
, n
))
449 i_add_imm(op
, rd
, r1
, n
);
451 i_add_anyimm(rd
, r1
, n
);
453 if ((op
& 0xf0) == 0x10) /* shl */
454 i_shl_imm(op
, rd
, r1
, n
);
455 if ((op
& 0xf0) == 0x20) /* mul */
456 die("mul/imm not implemented");
457 if ((op
& 0xf0) == 0x30) { /* cmp */
461 if ((op
& 0xf0) == 0x50) { /* etc */
462 if ((op
& 0xff) == O_ZX
)
464 if ((op
& 0xff) == O_SX
)
466 if ((op
& 0xff) == O_MOV
)
471 void i_memcpy(int r0
, int r1
, int r2
)
473 os("\xfc\xf3\xa4", 3); /* cld; rep movs */
476 void i_memset(int r0
, int r1
, int r2
)
478 os("\xfc\xf3\xaa", 3); /* cld; rep stosb */
481 void i_call_reg(int rd
)
483 op_rr(I_CALL
, 2, rd
, LONGSZ
);
486 void i_call(char *sym
, int off
)
488 os("\xe8", 1); /* call $x */
490 out_rel(sym
, OUT_CS
| OUT_RLREL
, cslen
);
494 static int func_argc
;
495 static int func_varg
;
496 static int func_spsub
;
497 static int func_sargs
;
498 static int func_sregs
;
499 static int func_initfp
;
500 static int spsub_addr
;
511 for (i
= 0; i
< N_TMPS
; i
++)
512 if ((1 << tmpregs
[i
]) & func_sregs
)
517 static void i_saveargs(void)
520 os("\x58", 1); /* pop rax */
521 for (i
= N_ARGS
- 1; i
>= 0; i
--)
522 if ((1 << argregs
[i
]) & func_sargs
)
524 os("\x50", 1); /* push rax */
527 void i_prolog(int argc
, int varg
, int sargs
, int sregs
, int initfp
, int subsp
)
535 func_initfp
= initfp
;
540 os("\x55", 1); /* push rbp */
541 os("\x48\x89\xe5", 3); /* mov rbp, rsp */
544 for (i
= N_TMPS
- 1; i
>= 0; i
--)
545 if ((1 << tmpregs
[i
]) & func_sregs
)
549 os("\x48\x81\xec", 3); /* sub rsp, $xxx */
555 void i_epilog(int sp_max
)
561 for (i
= 0; i
< N_TMPS
; i
++)
562 if ((1 << tmpregs
[i
]) & func_sregs
)
564 for (i
= 0; i
< N_ARGS
; i
++)
565 if ((1 << argregs
[i
]) & func_sargs
)
567 diff
= ALIGN(-sp_max
- nsregs
* LONGSZ
, 16);
568 /* forcing 16-byte alignment */
569 diff
= (nsregs
+ nsargs
) & 1 ? diff
+ LONGSZ
: diff
;
570 if (func_spsub
&& diff
) {
571 i_add_anyimm(R_RSP
, R_RBP
, -nsregs
* LONGSZ
);
572 putint(cs
+ spsub_addr
, diff
, 4);
575 for (i
= 0; i
< N_TMPS
; i
++)
576 if ((1 << tmpregs
[i
]) & func_sregs
)
580 os("\xc9", 1); /* leave */
582 os("\xc2", 1); /* ret n */
583 oi(nsargs
* LONGSZ
, 2);
585 os("\xc3", 1); /* ret */