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comparison m68k_util.c @ 2651:1072cc337822

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Implement TAS in new 68K core
author Michael Pavone <pavone@retrodev.com>
date Sun, 02 Mar 2025 01:01:57 -0800
parents 620f30af9fdc
children 6068d32b756c
comparison
equal deleted inserted replaced
2650:9263d064294c 2651:1072cc337822
1 #include <string.h> 1 #include <string.h>
2 2
3 void m68k_read_8(m68k_context *context) 3 void m68k_read_8(m68k_context *context)
4 { 4 {
5 context->cycles += 4 * context->opts->gen.clock_divider; 5 context->cycles += 4 * context->opts->gen.clock_divider;
6 #ifdef DEBUG_DISASM
7 uint32_t tmp = context->scratch1;
8 #endif
6 context->scratch1 = read_byte(context->scratch1, (void**)context->mem_pointers, &context->opts->gen, context); 9 context->scratch1 = read_byte(context->scratch1, (void**)context->mem_pointers, &context->opts->gen, context);
10 #ifdef DEBUG_DISASM
11 if (context->pc >= 0x3F48 && context->pc < 0x3FCE) {
12 printf("Read.b %05X: %02X\n", tmp, context->scratch1);
13 }
14 #endif
7 } 15 }
8 16
9 #ifdef DEBUG_DISASM 17 #ifdef DEBUG_DISASM
10 #include "68kinst.h" 18 #include "68kinst.h"
11 static uint16_t debug_disasm_fetch(uint32_t address, void *vcontext) 19 static uint16_t debug_disasm_fetch(uint32_t address, void *vcontext)
20 #ifdef DEBUG_DISASM 28 #ifdef DEBUG_DISASM
21 uint32_t tmp = context->scratch1; 29 uint32_t tmp = context->scratch1;
22 #endif 30 #endif
23 context->scratch1 = read_word(context->scratch1, (void**)context->mem_pointers, &context->opts->gen, context); 31 context->scratch1 = read_word(context->scratch1, (void**)context->mem_pointers, &context->opts->gen, context);
24 #ifdef DEBUG_DISASM 32 #ifdef DEBUG_DISASM
33 if (context->pc >= 0x3F48 && context->pc < 0x3FCE) {
25 if (tmp == context->pc) { 34 if (tmp == context->pc) {
26 m68kinst inst; 35 m68kinst inst;
27 m68k_decode(debug_disasm_fetch, context, &inst, tmp); 36 m68k_decode(debug_disasm_fetch, context, &inst, tmp);
28 static char disasm_buf[256]; 37 static char disasm_buf[256];
29 m68k_disasm(&inst, disasm_buf); 38 m68k_disasm(&inst, disasm_buf);
30 printf("Fetch %05X: %04X - %s, d0=%X, d1=%X, d2=%X, d3=%X, d4=%X, d6=%X, a7=%X, xflag=%d\n", tmp, context->scratch1, disasm_buf, context->dregs[0], context->dregs[1], context->dregs[2], context->dregs[3], context->dregs[4], context->dregs[6], context->aregs[7], context->xflag); 39 printf("Fetch %05X: %04X - %s, d0=%X, d1=%X, d2=%X, d3=%X, d4=%X, d6=%X, d7=%X, a3=%X, a7=%X, xflag=%d\n",
40 tmp, context->scratch1, disasm_buf, context->dregs[0], context->dregs[1], context->dregs[2], context->dregs[3],
41 context->dregs[4], context->dregs[6], context->dregs[7], context->aregs[3], context->aregs[7], context->xflag
42 );
31 } else { 43 } else {
32 printf("Read %05X: %04X\n", tmp, context->scratch1); 44 printf("Read %05X: %04X\n", tmp, context->scratch1);
33 } 45 }
46 }
34 #endif 47 #endif
35 } 48 }
36 49
37 void m68k_write_8(m68k_context *context) 50 void m68k_write_8(m68k_context *context)
38 { 51 {
39 context->cycles += 4 * context->opts->gen.clock_divider; 52 context->cycles += 4 * context->opts->gen.clock_divider;
40 write_byte(context->scratch2, context->scratch1, (void**)context->mem_pointers, &context->opts->gen, context); 53 write_byte(context->scratch2, context->scratch1, (void**)context->mem_pointers, &context->opts->gen, context);
54 #ifdef DEBUG_DISASM
55 if (context->pc >= 0x3F48 && context->pc < 0x3FCE) {
56 printf("Write.b %05X: %02X\n", context->scratch2, context->scratch1);
57 }
58 #endif
59 }
60
61 void m68k_rmw_writeback(m68k_context *context)
62 {
63 if (context->opts->gen.flags & M68K_OPT_BROKEN_READ_MODIFY) {
64 context->cycles += 4 * context->opts->gen.clock_divider;
65 } else {
66 write_byte(context->scratch2, context->scratch1, (void**)context->mem_pointers, &context->opts->gen, context);
67 }
41 } 68 }
42 69
43 void m68k_write_16(m68k_context *context) 70 void m68k_write_16(m68k_context *context)
44 { 71 {
45 context->cycles += 4 * context->opts->gen.clock_divider; 72 context->cycles += 4 * context->opts->gen.clock_divider;
46 write_word(context->scratch2, context->scratch1, (void**)context->mem_pointers, &context->opts->gen, context); 73 write_word(context->scratch2, context->scratch1, (void**)context->mem_pointers, &context->opts->gen, context);
74 #ifdef DEBUG_DISASM
75 if (context->pc >= 0x3F48 && context->pc < 0x3FCE) {
76 printf("Write %05X: %04X\n", context->scratch2, context->scratch1);
77 }
78 #endif
47 } 79 }
48 80
49 void m68k_sync_cycle(m68k_context *context, uint32_t target_cycle) 81 void m68k_sync_cycle(m68k_context *context, uint32_t target_cycle)
50 { 82 {
51 context->sync_cycle = target_cycle; //why? 83 context->sync_cycle = target_cycle; //why?