asmx64.c 21.5 KB
Newer Older
Markus Siemens's avatar
Markus Siemens committed
1
#include <stdint.h>
Damien's avatar
Damien committed
2
3
4
5
6
#include <stdio.h>
#include <assert.h>
#include <string.h>

#include "misc.h"
7
8
9
10
#include "mpconfig.h"

// wrapper around everything in this file
#if MICROPY_EMIT_X64
Damien's avatar
Damien committed
11

12
13
14
15
16
#include <sys/types.h>
#include <sys/mman.h>

#include "asmx64.h"

17
#if defined(__OpenBSD__) || defined(__MACH__)
18
19
20
#define MAP_ANONYMOUS MAP_ANON
#endif

Damien's avatar
Damien committed
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
/* all offsets are measured in multiples of 8 bytes */
#define WORD_SIZE                (8)

#define OPCODE_NOP               (0x90)
#define OPCODE_PUSH_R64          (0x50)
#define OPCODE_PUSH_I64          (0x68)
#define OPCODE_PUSH_M64          (0xff) /* /6 */
#define OPCODE_POP_R64           (0x58)
#define OPCODE_RET               (0xc3)
#define OPCODE_MOV_I8_TO_R8      (0xb0) /* +rb */
#define OPCODE_MOV_I64_TO_R64    (0xb8)
#define OPCODE_MOV_I32_TO_RM32   (0xc7)
#define OPCODE_MOV_R64_TO_RM64   (0x89)
#define OPCODE_MOV_RM64_TO_R64   (0x8b)
#define OPCODE_LEA_MEM_TO_R64    (0x8d) /* /r */
#define OPCODE_XOR_R64_TO_RM64   (0x31) /* /r */
#define OPCODE_ADD_R64_TO_RM64   (0x01)
#define OPCODE_ADD_I32_TO_RM32   (0x81) /* /0 */
#define OPCODE_ADD_I8_TO_RM32    (0x83) /* /0 */
#define OPCODE_SUB_R64_FROM_RM64 (0x29)
#define OPCODE_SUB_I32_FROM_RM64 (0x81) /* /5 */
#define OPCODE_SUB_I8_FROM_RM64  (0x83) /* /5 */
#define OPCODE_SHL_RM32_BY_I8    (0xc1) /* /4 */
#define OPCODE_SHR_RM32_BY_I8    (0xc1) /* /5 */
#define OPCODE_SAR_RM32_BY_I8    (0xc1) /* /7 */
#define OPCODE_CMP_I32_WITH_RM32 (0x81) /* /7 */
#define OPCODE_CMP_I8_WITH_RM32  (0x83) /* /7 */
#define OPCODE_CMP_R64_WITH_RM64 (0x39)
#define OPCODE_CMP_RM32_WITH_R32 (0x3b)
#define OPCODE_TEST_R8_WITH_RM8  (0x84) /* /r */
#define OPCODE_JMP_REL8          (0xeb)
#define OPCODE_JMP_REL32         (0xe9)
#define OPCODE_JCC_REL8          (0x70) /* | jcc type */
#define OPCODE_JCC_REL32_A       (0x0f)
#define OPCODE_JCC_REL32_B       (0x80) /* | jcc type */
#define OPCODE_SETCC_RM8_A       (0x0f)
#define OPCODE_SETCC_RM8_B       (0x90) /* | jcc type, /0 */
#define OPCODE_CALL_REL32        (0xe8)
#define OPCODE_CALL_RM32         (0xff) /* /2 */
#define OPCODE_LEAVE             (0xc9)

#define MODRM_R64(x)    ((x) << 3)
#define MODRM_RM_DISP0  (0x00)
#define MODRM_RM_DISP8  (0x40)
#define MODRM_RM_DISP32 (0x80)
#define MODRM_RM_REG    (0xc0)
#define MODRM_RM_R64(x) (x)

#define REX_PREFIX  (0x40)
#define REX_W       (0x08)  // width
#define REX_R       (0x04)  // register
#define REX_X       (0x02)  // index
#define REX_B       (0x01)  // base

#define IMM32_L0(x) ((x) & 0xff)
#define IMM32_L1(x) (((x) >> 8) & 0xff)
#define IMM32_L2(x) (((x) >> 16) & 0xff)
#define IMM32_L3(x) (((x) >> 24) & 0xff)
#define IMM64_L4(x) (((x) >> 32) & 0xff)
#define IMM64_L5(x) (((x) >> 40) & 0xff)
#define IMM64_L6(x) (((x) >> 48) & 0xff)
#define IMM64_L7(x) (((x) >> 56) & 0xff)

#define UNSIGNED_FIT8(x) (((x) & 0xffffffffffffff00) == 0)
#define UNSIGNED_FIT32(x) (((x) & 0xffffffff00000000) == 0)
#define SIGNED_FIT8(x) (((x) & 0xffffff80) == 0) || (((x) & 0xffffff80) == 0xffffff80)

struct _asm_x64_t {
    int pass;
    uint code_offset;
    uint code_size;
    byte *code_base;
    byte dummy_data[8];

95
    uint max_num_labels;
Damien's avatar
Damien committed
96
    int *label_offsets;
97
    int num_locals;
Damien's avatar
Damien committed
98
99
100
101
102
103
104
105
106
107
108
109
110
111
};

// for allocating memory, see src/v8/src/platform-linux.cc
void *alloc_mem(uint req_size, uint *alloc_size, bool is_exec) {
    req_size = (req_size + 0xfff) & (~0xfff);
    int prot = PROT_READ | PROT_WRITE | (is_exec ? PROT_EXEC : 0);
    void *ptr = mmap(NULL, req_size, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
    if (ptr == MAP_FAILED) {
        assert(0);
    }
    *alloc_size = req_size;
    return ptr;
}

112
113
asm_x64_t *asm_x64_new(uint max_num_labels) {
    asm_x64_t *as;
Damien's avatar
Damien committed
114
115
116
117
118
119

    as = m_new(asm_x64_t, 1);
    as->pass = 0;
    as->code_offset = 0;
    as->code_size = 0;
    as->code_base = NULL;
120
121
    as->max_num_labels = max_num_labels;
    as->label_offsets = m_new(int, max_num_labels);
122
    as->num_locals = 0;
Damien's avatar
Damien committed
123
124
125
126

    return as;
}

127
void asm_x64_free(asm_x64_t *as, bool free_code) {
Damien's avatar
Damien committed
128
    if (free_code) {
129
130
        // need to un-mmap
        //m_free(as->code_base);
Damien's avatar
Damien committed
131
132
133
134
135
136
137
138
139
140
141
142
143
    }
    /*
    if (as->label != NULL) {
        int i;
        for (i = 0; i < as->label->len; ++i)
        {
            Label* lab = &g_array_index(as->label, Label, i);
            if (lab->unresolved != NULL)
                g_array_free(lab->unresolved, true);
        }
        g_array_free(as->label, true);
    }
    */
144
    m_del_obj(asm_x64_t, as);
Damien's avatar
Damien committed
145
146
147
148
149
}

void asm_x64_start_pass(asm_x64_t *as, int pass) {
    as->pass = pass;
    as->code_offset = 0;
150
151
152
    if (pass == ASM_X64_PASS_2) {
        // reset all labels
        memset(as->label_offsets, -1, as->max_num_labels * sizeof(int));
Damien's avatar
Damien committed
153
154
155
156
    }
}

void asm_x64_end_pass(asm_x64_t *as) {
157
    if (as->pass == ASM_X64_PASS_2) {
Damien's avatar
Damien committed
158
159
        // calculate size of code in bytes
        as->code_size = as->code_offset;
160
161
162
        //as->code_base = m_new(byte, as->code_size); need to allocale executable memory
        uint actual_alloc;
        as->code_base = alloc_mem(as->code_size, &actual_alloc, true);
163
        //printf("code_size: %u\n", as->code_size);
Damien's avatar
Damien committed
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
    }

    /*
    // check labels are resolved
    if (as->label != NULL)
    {
        int i;
        for (i = 0; i < as->label->len; ++i)
            if (g_array_index(as->label, Label, i).unresolved != NULL)
                return false;
    }
    */
}

// all functions must go through this one to emit bytes
179
static byte *asm_x64_get_cur_to_write_bytes(asm_x64_t *as, int num_bytes_to_write) {
Damien's avatar
Damien committed
180
181
182
183
184
185
186
187
188
189
190
191
    //printf("emit %d\n", num_bytes_to_write);
    if (as->pass < ASM_X64_PASS_3) {
        as->code_offset += num_bytes_to_write;
        return as->dummy_data;
    } else {
        assert(as->code_offset + num_bytes_to_write <= as->code_size);
        byte *c = as->code_base + as->code_offset;
        as->code_offset += num_bytes_to_write;
        return c;
    }
}

192
uint asm_x64_get_code_size(asm_x64_t *as) {
Damien's avatar
Damien committed
193
194
195
    return as->code_size;
}

196
void *asm_x64_get_code(asm_x64_t *as) {
Damien's avatar
Damien committed
197
198
199
    return as->code_base;
}

200
static void asm_x64_write_byte_1(asm_x64_t *as, byte b1) {
Damien's avatar
Damien committed
201
202
203
204
    byte* c = asm_x64_get_cur_to_write_bytes(as, 1);
    c[0] = b1;
}

205
static void asm_x64_write_byte_2(asm_x64_t *as, byte b1, byte b2) {
Damien's avatar
Damien committed
206
207
208
209
210
    byte* c = asm_x64_get_cur_to_write_bytes(as, 2);
    c[0] = b1;
    c[1] = b2;
}

211
static void asm_x64_write_byte_3(asm_x64_t *as, byte b1, byte b2, byte b3) {
Damien's avatar
Damien committed
212
213
214
215
216
217
    byte* c = asm_x64_get_cur_to_write_bytes(as, 3);
    c[0] = b1;
    c[1] = b2;
    c[2] = b3;
}

218
static void asm_x64_write_word32(asm_x64_t *as, int w32) {
Damien's avatar
Damien committed
219
220
221
222
223
224
225
    byte* c = asm_x64_get_cur_to_write_bytes(as, 4);
    c[0] = IMM32_L0(w32);
    c[1] = IMM32_L1(w32);
    c[2] = IMM32_L2(w32);
    c[3] = IMM32_L3(w32);
}

226
static void asm_x64_write_word64(asm_x64_t *as, int64_t w64) {
Damien's avatar
Damien committed
227
228
229
230
231
232
233
234
235
236
237
238
    byte* c = asm_x64_get_cur_to_write_bytes(as, 8);
    c[0] = IMM32_L0(w64);
    c[1] = IMM32_L1(w64);
    c[2] = IMM32_L2(w64);
    c[3] = IMM32_L3(w64);
    c[4] = IMM64_L4(w64);
    c[5] = IMM64_L5(w64);
    c[6] = IMM64_L6(w64);
    c[7] = IMM64_L7(w64);
}

/* unused
239
static void asm_x64_write_word32_to(asm_x64_t *as, int offset, int w32) {
Damien's avatar
Damien committed
240
241
242
243
244
245
246
247
248
249
    byte* c;
    assert(offset + 4 <= as->code_size);
    c = as->code_base + offset;
    c[0] = IMM32_L0(w32);
    c[1] = IMM32_L1(w32);
    c[2] = IMM32_L2(w32);
    c[3] = IMM32_L3(w32);
}
*/

250
static void asm_x64_write_r64_disp(asm_x64_t *as, int r64, int disp_r64, int disp_offset) {
Damien's avatar
Damien committed
251
252
253
254
255
256
257
258
259
260
261
262
    assert(disp_r64 != REG_RSP);

    if (disp_offset == 0 && disp_r64 != REG_RBP) {
        asm_x64_write_byte_1(as, MODRM_R64(r64) | MODRM_RM_DISP0 | MODRM_RM_R64(disp_r64));
    } else if (SIGNED_FIT8(disp_offset)) {
        asm_x64_write_byte_2(as, MODRM_R64(r64) | MODRM_RM_DISP8 | MODRM_RM_R64(disp_r64), IMM32_L0(disp_offset));
    } else {
        asm_x64_write_byte_1(as, MODRM_R64(r64) | MODRM_RM_DISP32 | MODRM_RM_R64(disp_r64));
        asm_x64_write_word32(as, disp_offset);
    }
}

263
void asm_x64_nop(asm_x64_t *as) {
Damien's avatar
Damien committed
264
265
266
    asm_x64_write_byte_1(as, OPCODE_NOP);
}

267
void asm_x64_push_r64(asm_x64_t *as, int src_r64) {
Damien's avatar
Damien committed
268
269
270
    asm_x64_write_byte_1(as, OPCODE_PUSH_R64 | src_r64);
}

271
void asm_x64_push_i32(asm_x64_t *as, int src_i32) {
Damien's avatar
Damien committed
272
273
274
275
    asm_x64_write_byte_1(as, OPCODE_PUSH_I64);
    asm_x64_write_word32(as, src_i32); // will be sign extended to 64 bits
}

276
void asm_x64_push_disp(asm_x64_t *as, int src_r64, int src_offset) {
Damien's avatar
Damien committed
277
278
279
280
    asm_x64_write_byte_1(as, OPCODE_PUSH_M64);
    asm_x64_write_r64_disp(as, 6, src_r64, src_offset);
}

281
void asm_x64_pop_r64(asm_x64_t *as, int dest_r64) {
Damien's avatar
Damien committed
282
283
284
    asm_x64_write_byte_1(as, OPCODE_POP_R64 | dest_r64);
}

285
static void asm_x64_ret(asm_x64_t *as) {
Damien's avatar
Damien committed
286
287
288
    asm_x64_write_byte_1(as, OPCODE_RET);
}

289
void asm_x64_mov_r32_to_r32(asm_x64_t *as, int src_r32, int dest_r32) {
Damien's avatar
Damien committed
290
291
292
293
    // defaults to 32 bit operation
    asm_x64_write_byte_2(as, OPCODE_MOV_R64_TO_RM64, MODRM_R64(src_r32) | MODRM_RM_REG | MODRM_RM_R64(dest_r32));
}

294
void asm_x64_mov_r64_to_r64(asm_x64_t *as, int src_r64, int dest_r64) {
Damien's avatar
Damien committed
295
296
297
298
    // use REX prefix for 64 bit operation
    asm_x64_write_byte_3(as, REX_PREFIX | REX_W, OPCODE_MOV_R64_TO_RM64, MODRM_R64(src_r64) | MODRM_RM_REG | MODRM_RM_R64(dest_r64));
}

299
void asm_x64_mov_r64_to_disp(asm_x64_t *as, int src_r64, int dest_r64, int dest_disp) {
Damien's avatar
Damien committed
300
301
302
303
304
    // use REX prefix for 64 bit operation
    asm_x64_write_byte_2(as, REX_PREFIX | REX_W, OPCODE_MOV_R64_TO_RM64);
    asm_x64_write_r64_disp(as, src_r64, dest_r64, dest_disp);
}

305
void asm_x64_mov_disp_to_r64(asm_x64_t *as, int src_r64, int src_disp, int dest_r64) {
Damien's avatar
Damien committed
306
307
308
309
310
    // use REX prefix for 64 bit operation
    asm_x64_write_byte_2(as, REX_PREFIX | REX_W, OPCODE_MOV_RM64_TO_R64);
    asm_x64_write_r64_disp(as, dest_r64, src_r64, src_disp);
}

311
void asm_x64_lea_disp_to_r64(asm_x64_t *as, int src_r64, int src_disp, int dest_r64) {
Damien's avatar
Damien committed
312
313
314
315
316
317
318
319
320
    // use REX prefix for 64 bit operation
    asm_x64_write_byte_2(as, REX_PREFIX | REX_W, OPCODE_LEA_MEM_TO_R64);
    asm_x64_write_r64_disp(as, dest_r64, src_r64, src_disp);
}

void asm_x64_mov_i8_to_r8(asm_x64_t *as, int src_i8, int dest_r64) {
    asm_x64_write_byte_2(as, OPCODE_MOV_I8_TO_R8 | dest_r64, src_i8);
}

321
void asm_x64_mov_i32_to_r64(asm_x64_t *as, int src_i32, int dest_r64) {
Damien's avatar
Damien committed
322
323
324
325
326
    // cpu defaults to i32 to r64, with zero extension
    asm_x64_write_byte_1(as, OPCODE_MOV_I64_TO_R64 | dest_r64);
    asm_x64_write_word32(as, src_i32);
}

327
void asm_x64_mov_i64_to_r64(asm_x64_t *as, int64_t src_i64, int dest_r64) {
Damien's avatar
Damien committed
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
    // cpu defaults to i32 to r64
    // to mov i64 to r64 need to use REX prefix
    asm_x64_write_byte_2(as, REX_PREFIX | REX_W, OPCODE_MOV_I64_TO_R64 | dest_r64);
    asm_x64_write_word64(as, src_i64);
}

void asm_x64_mov_i64_to_r64_optimised(asm_x64_t *as, int64_t src_i64, int dest_r64) {
    if (UNSIGNED_FIT32(src_i64)) {
        // 5 bytes
        asm_x64_mov_i32_to_r64(as, src_i64 & 0xffffffff, dest_r64);
    } else {
        // 10 bytes
        asm_x64_mov_i64_to_r64(as, src_i64, dest_r64);
    }
}

344
void asm_x64_mov_i32_to_disp(asm_x64_t *as, int src_i32, int dest_r32, int dest_disp)
Damien's avatar
Damien committed
345
346
347
348
349
350
351
352
353
354
355
{
    assert(0);
    asm_x64_write_byte_1(as, OPCODE_MOV_I32_TO_RM32);
    //asm_x64_write_r32_disp(as, 0, dest_r32, dest_disp);
    asm_x64_write_word32(as, src_i32);
}

void asm_x64_xor_r64_to_r64(asm_x64_t *as, int src_r64, int dest_r64) {
    asm_x64_write_byte_3(as, REX_PREFIX | REX_W, OPCODE_XOR_R64_TO_RM64, MODRM_R64(src_r64) | MODRM_RM_REG | MODRM_RM_R64(dest_r64));
}

356
void asm_x64_add_r64_to_r64(asm_x64_t *as, int src_r64, int dest_r64) {
Damien's avatar
Damien committed
357
358
359
    asm_x64_write_byte_3(as, REX_PREFIX | REX_W, OPCODE_ADD_R64_TO_RM64, MODRM_R64(src_r64) | MODRM_RM_REG | MODRM_RM_R64(dest_r64));
}

360
void asm_x64_add_i32_to_r32(asm_x64_t *as, int src_i32, int dest_r32)
Damien's avatar
Damien committed
361
362
363
364
365
366
367
368
369
370
371
372
373
374
{
    assert(dest_r32 != REG_RSP); // in this case i think src_i32 must be 64 bits
    if (SIGNED_FIT8(src_i32))
    {
        asm_x64_write_byte_2(as, OPCODE_ADD_I8_TO_RM32, MODRM_R64(0) | MODRM_RM_REG | MODRM_RM_R64(dest_r32));
        asm_x64_write_byte_1(as, src_i32 & 0xff);
    }
    else
    {
        asm_x64_write_byte_2(as, OPCODE_ADD_I32_TO_RM32, MODRM_R64(0) | MODRM_RM_REG | MODRM_RM_R64(dest_r32));
        asm_x64_write_word32(as, src_i32);
    }
}

375
void asm_x64_sub_r32_from_r32(asm_x64_t *as, int src_r32, int dest_r32) {
Damien's avatar
Damien committed
376
377
378
379
    // defaults to 32 bit operation
    asm_x64_write_byte_2(as, OPCODE_SUB_R64_FROM_RM64, MODRM_R64(src_r32) | MODRM_RM_REG | MODRM_RM_R64(dest_r32));
}

380
void asm_x64_sub_r64_from_r64(asm_x64_t *as, int src_r64, int dest_r64) {
Damien's avatar
Damien committed
381
382
383
384
    // use REX prefix for 64 bit operation
    asm_x64_write_byte_3(as, REX_PREFIX | REX_W, OPCODE_SUB_R64_FROM_RM64, MODRM_R64(src_r64) | MODRM_RM_REG | MODRM_RM_R64(dest_r64));
}

385
void asm_x64_sub_i32_from_r32(asm_x64_t *as, int src_i32, int dest_r32) {
Damien's avatar
Damien committed
386
387
388
389
390
391
392
393
394
395
396
    if (SIGNED_FIT8(src_i32)) {
        // defaults to 32 bit operation
        asm_x64_write_byte_2(as, OPCODE_SUB_I8_FROM_RM64, MODRM_R64(5) | MODRM_RM_REG | MODRM_RM_R64(dest_r32));
        asm_x64_write_byte_1(as, src_i32 & 0xff);
    } else {
        // defaults to 32 bit operation
        asm_x64_write_byte_2(as, OPCODE_SUB_I32_FROM_RM64, MODRM_R64(5) | MODRM_RM_REG | MODRM_RM_R64(dest_r32));
        asm_x64_write_word32(as, src_i32);
    }
}

397
void asm_x64_sub_i32_from_r64(asm_x64_t *as, int src_i32, int dest_r64) {
Damien's avatar
Damien committed
398
399
400
401
402
403
404
405
406
407
408
409
    if (SIGNED_FIT8(src_i32)) {
        // use REX prefix for 64 bit operation
        asm_x64_write_byte_3(as, REX_PREFIX | REX_W, OPCODE_SUB_I8_FROM_RM64, MODRM_R64(5) | MODRM_RM_REG | MODRM_RM_R64(dest_r64));
        asm_x64_write_byte_1(as, src_i32 & 0xff);
    } else {
        // use REX prefix for 64 bit operation
        asm_x64_write_byte_3(as, REX_PREFIX | REX_W, OPCODE_SUB_I32_FROM_RM64, MODRM_R64(5) | MODRM_RM_REG | MODRM_RM_R64(dest_r64));
        asm_x64_write_word32(as, src_i32);
    }
}

/* shifts not tested */
410
void asm_x64_shl_r32_by_imm(asm_x64_t *as, int r32, int imm) {
Damien's avatar
Damien committed
411
412
413
414
    asm_x64_write_byte_2(as, OPCODE_SHL_RM32_BY_I8, MODRM_R64(4) | MODRM_RM_REG | MODRM_RM_R64(r32));
    asm_x64_write_byte_1(as, imm);
}

415
void asm_x64_shr_r32_by_imm(asm_x64_t *as, int r32, int imm) {
Damien's avatar
Damien committed
416
417
418
419
    asm_x64_write_byte_2(as, OPCODE_SHR_RM32_BY_I8, MODRM_R64(5) | MODRM_RM_REG | MODRM_RM_R64(r32));
    asm_x64_write_byte_1(as, imm);
}

420
void asm_x64_sar_r32_by_imm(asm_x64_t *as, int r32, int imm) {
Damien's avatar
Damien committed
421
422
423
424
    asm_x64_write_byte_2(as, OPCODE_SAR_RM32_BY_I8, MODRM_R64(7) | MODRM_RM_REG | MODRM_RM_R64(r32));
    asm_x64_write_byte_1(as, imm);
}

425
void asm_x64_cmp_r64_with_r64(asm_x64_t *as, int src_r64_a, int src_r64_b) {
Damien's avatar
Damien committed
426
427
428
    asm_x64_write_byte_3(as, REX_PREFIX | REX_W, OPCODE_CMP_R64_WITH_RM64, MODRM_R64(src_r64_a) | MODRM_RM_REG | MODRM_RM_R64(src_r64_b));
}

429
void asm_x64_cmp_r32_with_disp(asm_x64_t *as, int src_r32_a, int src_r32_b, int src_disp_b) {
Damien's avatar
Damien committed
430
431
432
433
434
    assert(0);
    asm_x64_write_byte_1(as, OPCODE_CMP_R64_WITH_RM64);
    //asm_x64_write_r32_disp(as, src_r32_a, src_r32_b, src_disp_b);
}

435
void asm_x64_cmp_disp_with_r32(asm_x64_t *as, int src_r32_a, int src_disp_a, int src_r32_b) {
Damien's avatar
Damien committed
436
437
438
439
440
    assert(0);
    asm_x64_write_byte_1(as, OPCODE_CMP_RM32_WITH_R32);
    //asm_x64_write_r32_disp(as, src_r32_b, src_r32_a, src_disp_a);
}

441
void asm_x64_cmp_i32_with_r32(asm_x64_t *as, int src_i32, int src_r32) {
Damien's avatar
Damien committed
442
443
444
445
446
447
448
449
450
    if (SIGNED_FIT8(src_i32)) {
        asm_x64_write_byte_2(as, OPCODE_CMP_I8_WITH_RM32, MODRM_R64(7) | MODRM_RM_REG | MODRM_RM_R64(src_r32));
        asm_x64_write_byte_1(as, src_i32 & 0xff);
    } else {
        asm_x64_write_byte_2(as, OPCODE_CMP_I32_WITH_RM32, MODRM_R64(7) | MODRM_RM_REG | MODRM_RM_R64(src_r32));
        asm_x64_write_word32(as, src_i32);
    }
}

451
void asm_x64_test_r8_with_r8(asm_x64_t *as, int src_r64_a, int src_r64_b) {
Damien's avatar
Damien committed
452
453
454
    // TODO implement for other registers
    assert(src_r64_a == REG_RAX);
    assert(src_r64_b == REG_RAX);
Damien's avatar
Damien committed
455
456
457
    asm_x64_write_byte_2(as, OPCODE_TEST_R8_WITH_RM8, MODRM_R64(src_r64_a) | MODRM_RM_REG | MODRM_RM_R64(src_r64_b));
}

458
void asm_x64_setcc_r8(asm_x64_t *as, int jcc_type, int dest_r8) {
Damien's avatar
Damien committed
459
460
461
    asm_x64_write_byte_3(as, OPCODE_SETCC_RM8_A, OPCODE_SETCC_RM8_B | jcc_type, MODRM_R64(0) | MODRM_RM_REG | MODRM_RM_R64(dest_r8));
}

462
void asm_x64_label_assign(asm_x64_t *as, int label) {
463
464
465
466
467
468
469
470
471
    assert(label < as->max_num_labels);
    if (as->pass == ASM_X64_PASS_2) {
        // assign label offset
        assert(as->label_offsets[label] == -1);
        as->label_offsets[label] = as->code_offset;
    } else if (as->pass == ASM_X64_PASS_3) {
        // ensure label offset has not changed from PASS_2 to PASS_3
        //printf("l%d: (at %d=%ld)\n", label, as->label_offsets[label], as->code_offset);
        assert(as->label_offsets[label] == as->code_offset);
Damien's avatar
Damien committed
472
473
474
    }
}

475
476
477
478
479
480
481
482
483
484
485
486
487
488
static int get_label_dest(asm_x64_t *as, int label) {
    assert(label < as->max_num_labels);
    return as->label_offsets[label];
}

void asm_x64_jmp_label(asm_x64_t *as, int label) {
    int dest = get_label_dest(as, label);
    int rel = dest - as->code_offset;
    if (dest >= 0 && rel < 0) {
        // is a backwards jump, so we know the size of the jump on the first pass
        // calculate rel assuming 8 bit relative jump
        rel -= 2;
        if (SIGNED_FIT8(rel)) {
            asm_x64_write_byte_2(as, OPCODE_JMP_REL8, rel & 0xff);
Damien's avatar
Damien committed
489
        } else {
490
491
            rel += 2;
            goto large_jump;
Damien's avatar
Damien committed
492
        }
493
494
495
496
497
498
    } else {
        // is a forwards jump, so need to assume it's large
        large_jump:
        rel -= 5;
        asm_x64_write_byte_1(as, OPCODE_JMP_REL32);
        asm_x64_write_word32(as, rel);
Damien's avatar
Damien committed
499
500
501
    }
}

502
503
504
505
506
507
508
509
510
void asm_x64_jcc_label(asm_x64_t *as, int jcc_type, int label) {
    int dest = get_label_dest(as, label);
    int rel = dest - as->code_offset;
    if (dest >= 0 && rel < 0) {
        // is a backwards jump, so we know the size of the jump on the first pass
        // calculate rel assuming 8 bit relative jump
        rel -= 2;
        if (SIGNED_FIT8(rel)) {
            asm_x64_write_byte_2(as, OPCODE_JCC_REL8 | jcc_type, rel & 0xff);
Damien's avatar
Damien committed
511
        } else {
512
513
            rel += 2;
            goto large_jump;
Damien's avatar
Damien committed
514
        }
515
516
517
518
519
520
    } else {
        // is a forwards jump, so need to assume it's large
        large_jump:
        rel -= 6;
        asm_x64_write_byte_2(as, OPCODE_JCC_REL32_A, OPCODE_JCC_REL32_B | jcc_type);
        asm_x64_write_word32(as, rel);
Damien's avatar
Damien committed
521
522
523
    }
}

524
void asm_x64_entry(asm_x64_t *as, int num_locals) {
Damien's avatar
Damien committed
525
526
527
528
529
530
531
532
    asm_x64_push_r64(as, REG_RBP);
    asm_x64_mov_r64_to_r64(as, REG_RSP, REG_RBP);
    if (num_locals < 0) {
        num_locals = 0;
    }
    num_locals |= 1; // make it odd so stack is aligned on 16 byte boundary
    asm_x64_sub_i32_from_r64(as, num_locals * WORD_SIZE, REG_RSP);
    asm_x64_push_r64(as, REG_RBX);
533
    as->num_locals = num_locals;
Damien's avatar
Damien committed
534
535
}

536
void asm_x64_exit(asm_x64_t *as) {
Damien's avatar
Damien committed
537
538
539
540
541
    asm_x64_pop_r64(as, REG_RBX);
    asm_x64_write_byte_1(as, OPCODE_LEAVE);
    asm_x64_ret(as);
}

542
void asm_x64_push_arg(asm_x64_t *as, int src_arg_num) {
Damien's avatar
Damien committed
543
544
545
546
    assert(0);
    asm_x64_push_disp(as, REG_RBP, 8 + src_arg_num * WORD_SIZE);
}

547
void asm_x64_mov_arg_to_r32(asm_x64_t *as, int src_arg_num, int dest_r32) {
Damien's avatar
Damien committed
548
549
550
551
    assert(0);
    //asm_x64_mov_disp_to_r32(as, REG_RBP, 8 + src_arg_num * WORD_SIZE, dest_r32);
}

552
void asm_x64_mov_r32_to_arg(asm_x64_t *as, int src_r32, int dest_arg_num) {
Damien's avatar
Damien committed
553
554
555
556
    assert(0);
    //asm_x64_mov_r32_to_disp(as, src_r32, REG_RBP, 8 + dest_arg_num * WORD_SIZE);
}

557
558
559
560
561
562
563
564
565
566
567
568
569
// locals:
//  - stored on the stack in ascending order
//  - numbered 0 through as->num_locals-1
//  - RBP points above the last local
//
//                          | RPB
//                          v
//  l0  l1  l2  ...  l(n-1)
//  ^                ^
//  | low address    | high address in RAM
//
static int asm_x64_local_offset_from_ebp(asm_x64_t *as, int local_num) {
    return (-as->num_locals + local_num) * WORD_SIZE;
Damien's avatar
Damien committed
570
571
}

572
573
void asm_x64_mov_local_to_r64(asm_x64_t *as, int src_local_num, int dest_r64) {
    asm_x64_mov_disp_to_r64(as, REG_RBP, asm_x64_local_offset_from_ebp(as, src_local_num), dest_r64);
Damien's avatar
Damien committed
574
575
}

576
577
void asm_x64_mov_r64_to_local(asm_x64_t *as, int src_r64, int dest_local_num) {
    asm_x64_mov_r64_to_disp(as, src_r64, REG_RBP, asm_x64_local_offset_from_ebp(as, dest_local_num));
Damien's avatar
Damien committed
578
579
}

580
581
void asm_x64_mov_local_addr_to_r64(asm_x64_t *as, int local_num, int dest_r64) {
    int offset = asm_x64_local_offset_from_ebp(as, local_num);
Damien's avatar
Damien committed
582
583
584
585
586
587
588
    if (offset == 0) {
        asm_x64_mov_r64_to_r64(as, REG_RBP, dest_r64);
    } else {
        asm_x64_lea_disp_to_r64(as, REG_RBP, offset, dest_r64);
    }
}

589
590
void asm_x64_push_local(asm_x64_t *as, int local_num) {
    asm_x64_push_disp(as, REG_RBP, asm_x64_local_offset_from_ebp(as, local_num));
Damien's avatar
Damien committed
591
592
}

593
void asm_x64_push_local_addr(asm_x64_t *as, int local_num, int temp_r64)
Damien's avatar
Damien committed
594
595
{
    asm_x64_mov_r64_to_r64(as, REG_RBP, temp_r64);
596
    asm_x64_add_i32_to_r32(as, asm_x64_local_offset_from_ebp(as, local_num), temp_r64);
Damien's avatar
Damien committed
597
598
599
600
601
602
    asm_x64_push_r64(as, temp_r64);
}

/*
   can't use these because code might be relocated when resized

603
void asm_x64_call(asm_x64_t *as, void* func)
Damien's avatar
Damien committed
604
605
606
607
608
609
610
{
    asm_x64_sub_i32_from_r32(as, 8, REG_RSP);
    asm_x64_write_byte_1(as, OPCODE_CALL_REL32);
    asm_x64_write_word32(as, func - (void*)(as->code_cur + 4));
    asm_x64_mov_r64_to_r64(as, REG_RBP, REG_RSP);
}

611
void asm_x64_call_i1(asm_x64_t *as, void* func, int i1)
Damien's avatar
Damien committed
612
613
614
615
616
617
618
619
620
621
622
{
    asm_x64_sub_i32_from_r32(as, 8, REG_RSP);
    asm_x64_sub_i32_from_r32(as, 12, REG_RSP);
    asm_x64_push_i32(as, i1);
    asm_x64_write_byte_1(as, OPCODE_CALL_REL32);
    asm_x64_write_word32(as, func - (void*)(as->code_cur + 4));
    asm_x64_add_i32_to_r32(as, 16, REG_RSP);
    asm_x64_mov_r64_to_r64(as, REG_RBP, REG_RSP);
}
*/

623
void asm_x64_call_ind(asm_x64_t *as, void *ptr, int temp_r64) {
624
625
626
627
628
629
#ifdef __LP64__
    asm_x64_mov_i64_to_r64_optimised(as, (int64_t)ptr, temp_r64);
#else
    // If we get here, sizeof(int) == sizeof(void*).
    asm_x64_mov_i64_to_r64_optimised(as, (int64_t)(unsigned int)ptr, temp_r64);
#endif
Damien's avatar
Damien committed
630
631
    asm_x64_write_byte_2(as, OPCODE_CALL_RM32, MODRM_R64(2) | MODRM_RM_REG | MODRM_RM_R64(temp_r64));
    // this reduces code size by 2 bytes per call, but doesn't seem to speed it up at all
632
633
    // doesn't work anymore because calls are 64 bits away
    /*
Damien's avatar
Damien committed
634
635
    asm_x64_write_byte_1(as, OPCODE_CALL_REL32);
    asm_x64_write_word32(as, ptr - (void*)(as->code_base + as->code_offset + 4));
636
    */
Damien's avatar
Damien committed
637
}
638
639

#endif // MICROPY_EMIT_X64