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, SH2 *other_sh2)
  18 {
  19         int ret = 0;
  20         unsigned int mult_m68k_to_sh2 = sh2->mult_m68k_to_sh2;
  21         unsigned int mult_sh2_to_m68k = sh2->mult_sh2_to_m68k;
  22
  23         memset(sh2, 0, sizeof(*sh2));
  24         sh2->is_slave = is_slave;
  25         sh2->other_sh2 = other_sh2;
  26         sh2->mult_m68k_to_sh2 = mult_m68k_to_sh2;
  27         sh2->mult_sh2_to_m68k = mult_sh2_to_m68k;
  28
  29         pdb_register_cpu(sh2, PDBCT_SH2, is_slave ? "ssh2" : "msh2");
  30 #ifdef DRC_SH2
  31         ret = sh2_drc_init(sh2);
  32 #endif
  33         return ret;
  34 }
  35
  36 void sh2_finish(SH2 *sh2)
  37 {
  38 #ifdef DRC_SH2
  39         sh2_drc_finish(sh2);
  40 #endif
  41 }
  42
  43 void sh2_reset(SH2 *sh2)
  44 {
  45         sh2->pc = p32x_sh2_read32(0, sh2);
  46         sh2->r[15] = p32x_sh2_read32(4, sh2);
  47         sh2->sr = I;
  48         sh2->vbr = 0;
  49         sh2->pending_int_irq = 0;
  50 }
  51
  52 void sh2_do_irq(SH2 *sh2, int level, int vector)
  53 {
  54         sh2->sr &= 0x3f3;
  55
  56         sh2->r[15] -= 4;
  57         p32x_sh2_write32(sh2->r[15], sh2->sr, sh2);     /* push SR onto stack */
  58         sh2->r[15] -= 4;
  59         p32x_sh2_write32(sh2->r[15], sh2->pc, sh2);     /* push PC onto stack */
  60
  61         /* set I flags in SR */
  62         sh2->sr = (sh2->sr & ~I) | (level << 4);
  63
  64         /* fetch PC */
  65         sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2);
  66
  67         /* 13 cycles at best */
  68         sh2->icount -= 13;
  69 }
  70
  71 int sh2_irl_irq(SH2 *sh2, int level, int nested_call)
  72 {
  73         int taken;
  74
  75         sh2->pending_irl = level;
  76         if (level < sh2->pending_int_irq)
  77                 level = sh2->pending_int_irq;
  78         sh2->pending_level = level;
  79
  80         taken = (level > ((sh2->sr >> 4) & 0x0f));
  81         if (taken) {
  82                 if (!nested_call) {
  83                         // not in memhandler, so handle this now (recompiler friendly)
  84                         // do this to avoid missing irqs that other SH2 might clear
  85                         int vector = sh2->irq_callback(sh2, level);
  86                         sh2_do_irq(sh2, level, vector);
  87                         sh2->m68krcycles_done += C_SH2_TO_M68K(*sh2, 13);
  88                 }
  89                 else
  90                         sh2->test_irq = 1;
  91         }
  92         return taken;
  93 }
  94
  95 void sh2_internal_irq(SH2 *sh2, int level, int vector)
  96 {
  97         // FIXME: multiple internal irqs not handled..
  98         // assuming internal irqs never clear until accepted
  99         sh2->pending_int_irq = level;
 100         sh2->pending_int_vector = vector;
 101         if (level > sh2->pending_level)
 102                 sh2->pending_level = level;
 103
 104         sh2->test_irq = 1;
 105 }
 106
 107 #define SH2_REG_SIZE (offsetof(SH2, macl) + sizeof(sh2->macl))
 108
 109 void sh2_pack(const SH2 *sh2, unsigned char *buff)
 110 {
 111         unsigned int *p;
 112
 113         memcpy(buff, sh2, SH2_REG_SIZE);
 114         p = (void *)(buff + SH2_REG_SIZE);
 115
 116         p[0] = sh2->pending_int_irq;
 117         p[1] = sh2->pending_int_vector;
 118 }
 119
 120 void sh2_unpack(SH2 *sh2, const unsigned char *buff)
 121 {
 122         unsigned int *p;
 123
 124         memcpy(sh2, buff, SH2_REG_SIZE);
 125         p = (void *)(buff + SH2_REG_SIZE);
 126
 127         sh2->pending_int_irq = p[0];
 128         sh2->pending_int_vector = p[1];
 129         sh2->test_irq = 1;
 130 }
 131
 132 #ifdef DRC_CMP
 133
 134 /* trace/compare */
 135 #include <stdio.h>
 136 #include <stdlib.h>
 137 #include <pico/memory.h>
 138 #undef _USE_CZ80 // HACK
 139 #include <pico/pico_int.h>
 140 #include <pico/debug.h>
 141
 142 static SH2 sh2ref[2];
 143 static unsigned int mem_val;
 144
 145 static unsigned int local_read32(SH2 *sh2, u32 a)
 146 {
 147         const sh2_memmap *sh2_map = sh2->read16_map;
 148         u16 *pd;
 149         uptr p;
 150
 151         sh2_map += (a >> 25);
 152         p = sh2_map->addr;
 153         if (!map_flag_set(p)) {
 154                 pd = (u16 *)((p << 1) + ((a & sh2_map->mask) & ~1));
 155                 return (pd[0] << 16) | pd[1];
 156         }
 157
 158         if ((a & 0xfffff000) == 0xc0000000) {
 159                 // data array
 160                 pd = (u16 *)sh2->data_array + (a & 0xfff) / 2;
 161                 return (pd[0] << 16) | pd[1];
 162         }
 163         if ((a & 0xdfffffc0) == 0x4000) {
 164                 pd = &Pico32x.regs[(a & 0x3f) / 2];
 165                 return (pd[0] << 16) | pd[1];
 166         }
 167         if ((a & 0xdffffe00) == 0x4200) {
 168                 pd = &Pico32xMem->pal[(a & 0x1ff) / 2];
 169                 return (pd[0] << 16) | pd[1];
 170         }
 171
 172         return 0;
 173 }
 174
 175 void do_sh2_trace(SH2 *current, int cycles)
 176 {
 177         static int current_slave = -1;
 178         static u32 current_m68k_pc;
 179         SH2 *sh2o = &sh2ref[current->is_slave];
 180         u32 *regs_a = (void *)current;
 181         u32 *regs_o = (void *)sh2o;
 182         unsigned char v;
 183         u32 val;
 184         int i;
 185
 186         if (SekPc != current_m68k_pc) {
 187                 current_m68k_pc = SekPc;
 188                 tl_write_uint(CTL_M68KPC, current_m68k_pc);
 189         }
 190
 191         if (current->is_slave != current_slave) {
 192                 current_slave = current->is_slave;
 193                 v = CTL_MASTERSLAVE | current->is_slave;
 194                 tl_write(&v, sizeof(v));
 195         }
 196
 197         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 198                 if (i == 17) // ppc
 199                         continue;
 200                 if (regs_a[i] != regs_o[i]) {
 201                         tl_write_uint(CTL_SH2_R + i, regs_a[i]);
 202                         regs_o[i] = regs_a[i];
 203                 }
 204         }
 205
 206         if (current->ea != sh2o->ea) {
 207                 tl_write_uint(CTL_EA, current->ea);
 208                 sh2o->ea = current->ea;
 209         }
 210         val = local_read32(current, current->ea);
 211         if (mem_val != val) {
 212                 tl_write_uint(CTL_EAVAL, val);
 213                 mem_val = val;
 214         }
 215         tl_write_uint(CTL_CYCLES, cycles);
 216 }
 217
 218 static const char *regnames[] = {
 219         "r0",  "r1",  "r2",  "r3",
 220         "r4",  "r5",  "r6",  "r7",
 221         "r8",  "r9",  "r10", "r11",
 222         "r12", "r13", "r14", "r15",
 223         "pc",  "ppc", "pr",  "sr",
 224         "gbr", "vbr", "mach","macl",
 225 };
 226
 227 static void dump_regs(SH2 *sh2)
 228 {
 229         char csh2;
 230         int i;
 231
 232         csh2 = sh2->is_slave ? 's' : 'm';
 233         for (i = 0; i < 16/2; i++)
 234                 printf("%csh2 r%d: %08x r%02d: %08x\n", csh2,
 235                         i, sh2->r[i], i+8, sh2->r[i+8]);
 236         printf("%csh2 PC: %08x  ,   %08x\n", csh2, sh2->pc, sh2->ppc);
 237         printf("%csh2 SR:      %03x  PR: %08x\n", csh2, sh2->sr, sh2->pr);
 238 }
 239
 240 void REGPARM(1) do_sh2_cmp(SH2 *current)
 241 {
 242         static int current_slave;
 243         static u32 current_val;
 244         SH2 *sh2o = &sh2ref[current->is_slave];
 245         u32 *regs_a = (void *)current;
 246         u32 *regs_o = (void *)sh2o;
 247         unsigned char code;
 248         int cycles_o = 666;
 249         u32 sr, val;
 250         int bad = 0;
 251         int cycles;
 252         int i, ret;
 253
 254 #if 0
 255         sr = current->sr;
 256         current->sr &= 0x3f3;
 257         do_sh2_trace(current, (signed int)sr >> 12);
 258         current->sr = sr;
 259         return;
 260 #endif
 261         sh2ref[1].is_slave = 1;
 262
 263         while (1) {
 264                 ret = tl_read(&code, 1);
 265                 if (ret <= 0)
 266                         break;
 267                 if (code == CTL_CYCLES) {
 268                         tl_read(&cycles_o, 4);
 269                         break;
 270                 }
 271
 272                 switch (code) {
 273                 case CTL_MASTERSLAVE:
 274                 case CTL_MASTERSLAVE + 1:
 275                         current_slave = code & 1;
 276                         break;
 277                 case CTL_EA:
 278                         tl_read_uint(&sh2o->ea);
 279                         break;
 280                 case CTL_EAVAL:
 281                         tl_read_uint(&current_val);
 282                         break;
 283                 case CTL_M68KPC:
 284                         tl_read_uint(&val);
 285                         if (SekPc != val) {
 286                                 printf("m68k: %08x %08x\n", SekPc, val);
 287                                 bad = 1;
 288                         }
 289                         break;
 290                 default:
 291                         if (CTL_SH2_R <= code && code < CTL_SH2_R +
 292                             offsetof(SH2, read8_map) / 4)
 293                         {
 294                                 tl_read_uint(regs_o + code - CTL_SH2_R);
 295                         }
 296                         else
 297                         {
 298                                 printf("wrong code: %02x\n", code);
 299                                 goto end;
 300                         }
 301                         break;
 302                 }
 303         }
 304
 305         if (ret <= 0) {
 306                 printf("EOF?\n");
 307                 goto end;
 308         }
 309
 310         if (current->is_slave != current_slave) {
 311                 printf("bad slave: %d %d\n", current->is_slave,
 312                         current_slave);
 313                 bad = 1;
 314         }
 315
 316         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 317                 if (i == 17 || i == 19) // ppc, sr
 318                         continue;
 319                 if (regs_a[i] != regs_o[i]) {
 320                         printf("bad %4s: %08x %08x\n",
 321                                 regnames[i], regs_a[i], regs_o[i]);
 322                         bad = 1;
 323                 }
 324         }
 325
 326         sr = current->sr & 0x3f3;
 327         cycles = (signed int)current->sr >> 12;
 328
 329         if (sr != sh2o->sr) {
 330                 printf("bad SR:  %03x %03x\n", sr, sh2o->sr);
 331                 bad = 1;
 332         }
 333
 334         if (cycles != cycles_o) {
 335                 printf("bad cycles: %d %d\n", cycles, cycles_o);
 336                 bad = 1;
 337         }
 338
 339         val = local_read32(current, sh2o->ea);
 340         if (val != current_val) {
 341                 printf("bad val @%08x: %08x %08x\n", sh2o->ea, val, current_val);
 342                 bad = 1;
 343         }
 344
 345         if (!bad) {
 346                 sh2o->ppc = current->pc;
 347                 return;
 348         }
 349
 350 end:
 351         printf("--\n");
 352         dump_regs(sh2o);
 353         if (current->is_slave != current_slave)
 354                 dump_regs(&sh2ref[current->is_slave ^ 1]);
 355         PDebugDumpMem();
 356         exit(1);
 357 }
 358
 359 #endif // DRC_CMP