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         p[2] = sh2->m68krcycles_done;
 119 }
 120
 121 void sh2_unpack(SH2 *sh2, const unsigned char *buff)
 122 {
 123         unsigned int *p;
 124
 125         memcpy(sh2, buff, SH2_REG_SIZE);
 126         p = (void *)(buff + SH2_REG_SIZE);
 127
 128         sh2->pending_int_irq = p[0];
 129         sh2->pending_int_vector = p[1];
 130         sh2->test_irq = 1;
 131         sh2->m68krcycles_done = p[2];
 132 }
 133
 134 #ifdef DRC_CMP
 135
 136 /* trace/compare */
 137 #include <stdio.h>
 138 #include <stdlib.h>
 139 #include <pico/memory.h>
 140 #undef _USE_CZ80 // HACK
 141 #include <pico/pico_int.h>
 142 #include <pico/debug.h>
 143
 144 static SH2 sh2ref[2];
 145 static unsigned int mem_val;
 146
 147 static unsigned int local_read32(SH2 *sh2, u32 a)
 148 {
 149         const sh2_memmap *sh2_map = sh2->read16_map;
 150         u16 *pd;
 151         uptr p;
 152
 153         sh2_map += (a >> 25);
 154         p = sh2_map->addr;
 155         if (!map_flag_set(p)) {
 156                 pd = (u16 *)((p << 1) + ((a & sh2_map->mask) & ~1));
 157                 return (pd[0] << 16) | pd[1];
 158         }
 159
 160         if ((a & 0xfffff000) == 0xc0000000) {
 161                 // data array
 162                 pd = (u16 *)sh2->data_array + (a & 0xfff) / 2;
 163                 return (pd[0] << 16) | pd[1];
 164         }
 165         if ((a & 0xdfffffc0) == 0x4000) {
 166                 pd = &Pico32x.regs[(a & 0x3f) / 2];
 167                 return (pd[0] << 16) | pd[1];
 168         }
 169         if ((a & 0xdffffe00) == 0x4200) {
 170                 pd = &Pico32xMem->pal[(a & 0x1ff) / 2];
 171                 return (pd[0] << 16) | pd[1];
 172         }
 173
 174         return 0;
 175 }
 176
 177 void do_sh2_trace(SH2 *current, int cycles)
 178 {
 179         static int current_slave = -1;
 180         static u32 current_m68k_pc;
 181         SH2 *sh2o = &sh2ref[current->is_slave];
 182         u32 *regs_a = (void *)current;
 183         u32 *regs_o = (void *)sh2o;
 184         unsigned char v;
 185         u32 val;
 186         int i;
 187
 188         if (SekPc != current_m68k_pc) {
 189                 current_m68k_pc = SekPc;
 190                 tl_write_uint(CTL_M68KPC, current_m68k_pc);
 191         }
 192
 193         if (current->is_slave != current_slave) {
 194                 current_slave = current->is_slave;
 195                 v = CTL_MASTERSLAVE | current->is_slave;
 196                 tl_write(&v, sizeof(v));
 197         }
 198
 199         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 200                 if (i == 17) // ppc
 201                         continue;
 202                 if (regs_a[i] != regs_o[i]) {
 203                         tl_write_uint(CTL_SH2_R + i, regs_a[i]);
 204                         regs_o[i] = regs_a[i];
 205                 }
 206         }
 207
 208         if (current->ea != sh2o->ea) {
 209                 tl_write_uint(CTL_EA, current->ea);
 210                 sh2o->ea = current->ea;
 211         }
 212         val = local_read32(current, current->ea);
 213         if (mem_val != val) {
 214                 tl_write_uint(CTL_EAVAL, val);
 215                 mem_val = val;
 216         }
 217         tl_write_uint(CTL_CYCLES, cycles);
 218 }
 219
 220 static const char *regnames[] = {
 221         "r0",  "r1",  "r2",  "r3",
 222         "r4",  "r5",  "r6",  "r7",
 223         "r8",  "r9",  "r10", "r11",
 224         "r12", "r13", "r14", "r15",
 225         "pc",  "ppc", "pr",  "sr",
 226         "gbr", "vbr", "mach","macl",
 227 };
 228
 229 static void dump_regs(SH2 *sh2)
 230 {
 231         char csh2;
 232         int i;
 233
 234         csh2 = sh2->is_slave ? 's' : 'm';
 235         for (i = 0; i < 16/2; i++)
 236                 printf("%csh2 r%d: %08x r%02d: %08x\n", csh2,
 237                         i, sh2->r[i], i+8, sh2->r[i+8]);
 238         printf("%csh2 PC: %08x  ,   %08x\n", csh2, sh2->pc, sh2->ppc);
 239         printf("%csh2 SR:      %03x  PR: %08x\n", csh2, sh2->sr, sh2->pr);
 240 }
 241
 242 void REGPARM(1) do_sh2_cmp(SH2 *current)
 243 {
 244         static int current_slave;
 245         static u32 current_val;
 246         SH2 *sh2o = &sh2ref[current->is_slave];
 247         u32 *regs_a = (void *)current;
 248         u32 *regs_o = (void *)sh2o;
 249         unsigned char code;
 250         int cycles_o = 666;
 251         u32 sr, val;
 252         int bad = 0;
 253         int cycles;
 254         int i, ret;
 255
 256 #if 0
 257         sr = current->sr;
 258         current->sr &= 0x3f3;
 259         do_sh2_trace(current, (signed int)sr >> 12);
 260         current->sr = sr;
 261         return;
 262 #endif
 263         sh2ref[1].is_slave = 1;
 264
 265         while (1) {
 266                 ret = tl_read(&code, 1);
 267                 if (ret <= 0)
 268                         break;
 269                 if (code == CTL_CYCLES) {
 270                         tl_read(&cycles_o, 4);
 271                         break;
 272                 }
 273
 274                 switch (code) {
 275                 case CTL_MASTERSLAVE:
 276                 case CTL_MASTERSLAVE + 1:
 277                         current_slave = code & 1;
 278                         break;
 279                 case CTL_EA:
 280                         tl_read_uint(&sh2o->ea);
 281                         break;
 282                 case CTL_EAVAL:
 283                         tl_read_uint(&current_val);
 284                         break;
 285                 case CTL_M68KPC:
 286                         tl_read_uint(&val);
 287                         if (SekPc != val) {
 288                                 printf("m68k: %08x %08x\n", SekPc, val);
 289                                 bad = 1;
 290                         }
 291                         break;
 292                 default:
 293                         if (CTL_SH2_R <= code && code < CTL_SH2_R +
 294                             offsetof(SH2, read8_map) / 4)
 295                         {
 296                                 tl_read_uint(regs_o + code - CTL_SH2_R);
 297                         }
 298                         else
 299                         {
 300                                 printf("wrong code: %02x\n", code);
 301                                 goto end;
 302                         }
 303                         break;
 304                 }
 305         }
 306
 307         if (ret <= 0) {
 308                 printf("EOF?\n");
 309                 goto end;
 310         }
 311
 312         if (current->is_slave != current_slave) {
 313                 printf("bad slave: %d %d\n", current->is_slave,
 314                         current_slave);
 315                 bad = 1;
 316         }
 317
 318         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 319                 if (i == 17 || i == 19) // ppc, sr
 320                         continue;
 321                 if (regs_a[i] != regs_o[i]) {
 322                         printf("bad %4s: %08x %08x\n",
 323                                 regnames[i], regs_a[i], regs_o[i]);
 324                         bad = 1;
 325                 }
 326         }
 327
 328         sr = current->sr & 0x3f3;
 329         cycles = (signed int)current->sr >> 12;
 330
 331         if (sr != sh2o->sr) {
 332                 printf("bad SR:  %03x %03x\n", sr, sh2o->sr);
 333                 bad = 1;
 334         }
 335
 336         if (cycles != cycles_o) {
 337                 printf("bad cycles: %d %d\n", cycles, cycles_o);
 338                 bad = 1;
 339         }
 340
 341         val = local_read32(current, sh2o->ea);
 342         if (val != current_val) {
 343                 printf("bad val @%08x: %08x %08x\n", sh2o->ea, val, current_val);
 344                 bad = 1;
 345         }
 346
 347         if (!bad) {
 348                 sh2o->ppc = current->pc;
 349                 return;
 350         }
 351
 352 end:
 353         printf("--\n");
 354         dump_regs(sh2o);
 355         if (current->is_slave != current_slave)
 356                 dump_regs(&sh2ref[current->is_slave ^ 1]);
 357         PDebugDumpMem();
 358         exit(1);
 359 }
 360
 361 #endif // DRC_CMP