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