cpu/sh2/sh2.c

   1 /*
   2  * PicoDrive
   3  * (C) notaz, 2009,2010
   4  *
   5  * This work is licensed under the terms of MAME license.
   6  * See COPYING file in the top-level directory.
   7  */
   8 #include <string.h>
   9 #include <stddef.h>
  10
  11 #include "sh2.h"
  12 #include "../debug.h"
  13 #include "compiler.h"
  14
  15 #define I 0xf0
  16
  17 int sh2_init(SH2 *sh2, int is_slave)
  18 {
  19         int ret = 0;
  20
  21         memset(sh2, 0, offsetof(SH2, mult_m68k_to_sh2));
  22         sh2->is_slave = is_slave;
  23         pdb_register_cpu(sh2, PDBCT_SH2, is_slave ? "ssh2" : "msh2");
  24 #ifdef DRC_SH2
  25         ret = sh2_drc_init(sh2);
  26 #endif
  27         return ret;
  28 }
  29
  30 void sh2_finish(SH2 *sh2)
  31 {
  32 #ifdef DRC_SH2
  33         sh2_drc_finish(sh2);
  34 #endif
  35 }
  36
  37 void sh2_reset(SH2 *sh2)
  38 {
  39         sh2->pc = p32x_sh2_read32(0, sh2);
  40         sh2->r[15] = p32x_sh2_read32(4, sh2);
  41         sh2->sr = I;
  42         sh2->vbr = 0;
  43         sh2->pending_int_irq = 0;
  44 }
  45
  46 void sh2_do_irq(SH2 *sh2, int level, int vector)
  47 {
  48         sh2->sr &= 0x3f3;
  49
  50         sh2->r[15] -= 4;
  51         p32x_sh2_write32(sh2->r[15], sh2->sr, sh2);     /* push SR onto stack */
  52         sh2->r[15] -= 4;
  53         p32x_sh2_write32(sh2->r[15], sh2->pc, sh2);     /* push PC onto stack */
  54
  55         /* set I flags in SR */
  56         sh2->sr = (sh2->sr & ~I) | (level << 4);
  57
  58         /* fetch PC */
  59         sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2);
  60
  61         /* 13 cycles at best */
  62         sh2->icount -= 13;
  63 }
  64
  65 int sh2_irl_irq(SH2 *sh2, int level, int nested_call)
  66 {
  67         int taken;
  68
  69         sh2->pending_irl = level;
  70         if (level < sh2->pending_int_irq)
  71                 level = sh2->pending_int_irq;
  72         sh2->pending_level = level;
  73
  74         taken = (level > ((sh2->sr >> 4) & 0x0f));
  75         if (taken) {
  76                 if (!nested_call) {
  77                         // not in memhandler, so handle this now (recompiler friendly)
  78                         // do this to avoid missing irqs that other SH2 might clear
  79                         int vector = sh2->irq_callback(sh2, level);
  80                         sh2_do_irq(sh2, level, vector);
  81                         sh2->m68krcycles_done += C_SH2_TO_M68K(*sh2, 13);
  82                 }
  83                 else
  84                         sh2->test_irq = 1;
  85         }
  86         return taken;
  87 }
  88
  89 void sh2_internal_irq(SH2 *sh2, int level, int vector)
  90 {
  91         // FIXME: multiple internal irqs not handled..
  92         // assuming internal irqs never clear until accepted
  93         sh2->pending_int_irq = level;
  94         sh2->pending_int_vector = vector;
  95         if (level > sh2->pending_level)
  96                 sh2->pending_level = level;
  97
  98         sh2->test_irq = 1;
  99 }
 100
 101 #define SH2_REG_SIZE (offsetof(SH2, macl) + sizeof(sh2->macl))
 102
 103 void sh2_pack(const SH2 *sh2, unsigned char *buff)
 104 {
 105         unsigned int *p;
 106
 107         memcpy(buff, sh2, SH2_REG_SIZE);
 108         p = (void *)(buff + SH2_REG_SIZE);
 109
 110         p[0] = sh2->pending_int_irq;
 111         p[1] = sh2->pending_int_vector;
 112 }
 113
 114 void sh2_unpack(SH2 *sh2, const unsigned char *buff)
 115 {
 116         unsigned int *p;
 117
 118         memcpy(sh2, buff, SH2_REG_SIZE);
 119         p = (void *)(buff + SH2_REG_SIZE);
 120
 121         sh2->pending_int_irq = p[0];
 122         sh2->pending_int_vector = p[1];
 123         sh2->test_irq = 1;
 124 }
 125
 126 #ifdef DRC_CMP
 127
 128 /* trace/compare */
 129 #include <stdio.h>
 130 #include <stdlib.h>
 131 #include <pico/memory.h>
 132 #undef _USE_CZ80 // HACK
 133 #include <pico/pico_int.h>
 134 #include <pico/debug.h>
 135
 136 static SH2 sh2ref[2];
 137 static unsigned int mem_val;
 138 static FILE *f;
 139
 140 enum ctl_byte {
 141         CTL_MASTERSLAVE = 0x80,
 142         CTL_EA = 0x82,
 143         CTL_EAVAL = 0x83,
 144         CTL_M68KPC = 0x84,
 145         CTL_CYCLES = 0x85,
 146 };
 147
 148 #define SH2MAP_ADDR2OFFS_R(a) \
 149   ((((a) >> 25) & 3) | (((a) >> 27) & 0x1c))
 150
 151 static unsigned int local_read32(SH2 *sh2, u32 a)
 152 {
 153         const sh2_memmap *sh2_map = sh2->read16_map;
 154         u16 *pd;
 155         uptr p;
 156
 157         sh2_map += SH2MAP_ADDR2OFFS_R(a);
 158         p = sh2_map->addr;
 159         if (!map_flag_set(p)) {
 160                 pd = (u16 *)((p << 1) + ((a & sh2_map->mask) & ~1));
 161                 return (pd[0] << 16) | pd[1];
 162         }
 163
 164         if ((a & 0xfffff000) == 0xc0000000) {
 165                 // data array
 166                 pd = (u16 *)Pico32xMem->data_array[sh2->is_slave]
 167                         + (a & 0xfff) / 2;
 168                 return (pd[0] << 16) | pd[1];
 169         }
 170         if ((a & 0xdfffffc0) == 0x4000) {
 171                 pd = &Pico32x.regs[(a & 0x3f) / 2];
 172                 return (pd[0] << 16) | pd[1];
 173         }
 174         if ((a & 0xdffffe00) == 0x4200) {
 175                 pd = &Pico32xMem->pal[(a & 0x1ff) / 2];
 176                 return (pd[0] << 16) | pd[1];
 177         }
 178
 179         return 0;
 180 }
 181
 182 static void write_uint(unsigned char ctl, unsigned int v)
 183 {
 184         fwrite(&ctl, 1, 1, f);
 185         fwrite(&v, sizeof(v), 1, f);
 186 }
 187
 188 void do_sh2_trace(SH2 *current, int cycles)
 189 {
 190         static int current_slave = -1;
 191         static u32 current_m68k_pc;
 192         SH2 *sh2o = &sh2ref[current->is_slave];
 193         u32 *regs_a = (void *)current;
 194         u32 *regs_o = (void *)sh2o;
 195         unsigned char v;
 196         u32 val;
 197         int i;
 198
 199         if (f == NULL)
 200                 f = fopen("tracelog", "wb");
 201
 202         if (SekPc != current_m68k_pc) {
 203                 current_m68k_pc = SekPc;
 204                 write_uint(CTL_M68KPC, current_m68k_pc);
 205         }
 206
 207         if (current->is_slave != current_slave) {
 208                 current_slave = current->is_slave;
 209                 v = CTL_MASTERSLAVE | current->is_slave;
 210                 fwrite(&v, 1, 1, f);
 211         }
 212
 213         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 214                 if (i == 17) // ppc
 215                         continue;
 216                 if (regs_a[i] != regs_o[i]) {
 217                         write_uint(i, regs_a[i]);
 218                         regs_o[i] = regs_a[i];
 219                 }
 220         }
 221
 222         if (current->ea != sh2o->ea) {
 223                 write_uint(CTL_EA, current->ea);
 224                 sh2o->ea = current->ea;
 225         }
 226         val = local_read32(current, current->ea);
 227         if (mem_val != val) {
 228                 write_uint(CTL_EAVAL, val);
 229                 mem_val = val;
 230         }
 231         write_uint(CTL_CYCLES, cycles);
 232 }
 233
 234 static const char *regnames[] = {
 235         "r0",  "r1",  "r2",  "r3",
 236         "r4",  "r5",  "r6",  "r7",
 237         "r8",  "r9",  "r10", "r11",
 238         "r12", "r13", "r14", "r15",
 239         "pc",  "ppc", "pr",  "sr",
 240         "gbr", "vbr", "mach","macl",
 241 };
 242
 243 static void dump_regs(SH2 *sh2)
 244 {
 245         char csh2;
 246         int i;
 247
 248         csh2 = sh2->is_slave ? 's' : 'm';
 249         for (i = 0; i < 16/2; i++)
 250                 printf("%csh2 r%d: %08x r%02d: %08x\n", csh2,
 251                         i, sh2->r[i], i+8, sh2->r[i+8]);
 252         printf("%csh2 PC: %08x  ,   %08x\n", csh2, sh2->pc, sh2->ppc);
 253         printf("%csh2 SR:      %03x  PR: %08x\n", csh2, sh2->sr, sh2->pr);
 254 }
 255
 256 void do_sh2_cmp(SH2 *current)
 257 {
 258         static int current_slave;
 259         static u32 current_val;
 260         SH2 *sh2o = &sh2ref[current->is_slave];
 261         u32 *regs_a = (void *)current;
 262         u32 *regs_o = (void *)sh2o;
 263         unsigned char code;
 264         int cycles_o = 666;
 265         u32 sr, val;
 266         int bad = 0;
 267         int cycles;
 268         int i, ret;
 269
 270         if (f == NULL) {
 271                 f = fopen("tracelog", "rb");
 272                 sh2ref[1].is_slave = 1;
 273         }
 274
 275         while (1) {
 276                 ret = fread(&code, 1, 1, f);
 277                 if (ret <= 0)
 278                         break;
 279                 if (code == CTL_CYCLES) {
 280                         fread(&cycles_o, 1, 4, f);
 281                         break;
 282                 }
 283
 284                 switch (code) {
 285                 case CTL_MASTERSLAVE:
 286                 case CTL_MASTERSLAVE + 1:
 287                         current_slave = code & 1;
 288                         break;
 289                 case CTL_EA:
 290                         fread(&sh2o->ea, 4, 1, f);
 291                         break;
 292                 case CTL_EAVAL:
 293                         fread(&current_val, 4, 1, f);
 294                         break;
 295                 case CTL_M68KPC:
 296                         fread(&val, 4, 1, f);
 297                         if (SekPc != val) {
 298                                 printf("m68k: %08x %08x\n", SekPc, val);
 299                                 bad = 1;
 300                         }
 301                         break;
 302                 default:
 303                         if (code < offsetof(SH2, read8_map) / 4)
 304                                 fread(regs_o + code, 4, 1, f);
 305                         else {
 306                                 printf("invalid code: %02x\n", code);
 307                                 goto end;
 308                         }
 309                         break;
 310                 }
 311         }
 312
 313         if (ret <= 0) {
 314                 printf("EOF?\n");
 315                 goto end;
 316         }
 317
 318         if (current->is_slave != current_slave) {
 319                 printf("bad slave: %d %d\n", current->is_slave,
 320                         current_slave);
 321                 bad = 1;
 322         }
 323
 324         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 325                 if (i == 17 || i == 19) // ppc, sr
 326                         continue;
 327                 if (regs_a[i] != regs_o[i]) {
 328                         printf("bad %4s: %08x %08x\n",
 329                                 regnames[i], regs_a[i], regs_o[i]);
 330                         bad = 1;
 331                 }
 332         }
 333
 334         sr = current->sr & 0x3f3;
 335         cycles = (signed int)current->sr >> 12;
 336
 337         if (sr != sh2o->sr) {
 338                 printf("bad SR:  %03x %03x\n", sr, sh2o->sr);
 339                 bad = 1;
 340         }
 341
 342         if (cycles != cycles_o) {
 343                 printf("bad cycles: %d %d\n", cycles, cycles_o);
 344                 bad = 1;
 345         }
 346
 347         val = local_read32(current, sh2o->ea);
 348         if (val != current_val) {
 349                 printf("bad val @%08x: %08x %08x\n", sh2o->ea, val, current_val);
 350                 bad = 1;
 351         }
 352
 353         if (!bad) {
 354                 sh2o->ppc = current->pc;
 355                 return;
 356         }
 357
 358 end:
 359         printf("--\n");
 360         dump_regs(sh2o);
 361         if (current->is_slave != current_slave)
 362                 dump_regs(&sh2ref[current->is_slave ^ 1]);
 363         PDebugDumpMem();
 364         exit(1);
 365 }
 366
 367 #endif // DRC_CMP