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->r[15] -= 4;
  49         p32x_sh2_write32(sh2->r[15], sh2->sr, sh2);     /* push SR onto stack */
  50         sh2->r[15] -= 4;
  51         p32x_sh2_write32(sh2->r[15], sh2->pc, sh2);     /* push PC onto stack */
  52
  53         /* set I flags in SR */
  54         sh2->sr = (sh2->sr & ~I) | (level << 4);
  55
  56         /* fetch PC */
  57         sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2);
  58
  59         /* 13 cycles at best */
  60         sh2->icount -= 13;
  61 }
  62
  63 int sh2_irl_irq(SH2 *sh2, int level, int nested_call)
  64 {
  65         int taken;
  66
  67         sh2->pending_irl = level;
  68         if (level < sh2->pending_int_irq)
  69                 level = sh2->pending_int_irq;
  70         sh2->pending_level = level;
  71
  72         taken = (level > ((sh2->sr >> 4) & 0x0f));
  73         if (taken) {
  74                 if (!nested_call) {
  75                         // not in memhandler, so handle this now (recompiler friendly)
  76                         // do this to avoid missing irqs that other SH2 might clear
  77                         int vector = sh2->irq_callback(sh2, level);
  78                         sh2_do_irq(sh2, level, vector);
  79                         sh2->m68krcycles_done += C_SH2_TO_M68K(*sh2, 13);
  80                 }
  81                 else
  82                         sh2->test_irq = 1;
  83         }
  84         return taken;
  85 }
  86
  87 void sh2_internal_irq(SH2 *sh2, int level, int vector)
  88 {
  89         // FIXME: multiple internal irqs not handled..
  90         // assuming internal irqs never clear until accepted
  91         sh2->pending_int_irq = level;
  92         sh2->pending_int_vector = vector;
  93         if (level > sh2->pending_level)
  94                 sh2->pending_level = level;
  95
  96         sh2->test_irq = 1;
  97 }
  98
  99 #define SH2_REG_SIZE (offsetof(SH2, macl) + sizeof(sh2->macl))
 100
 101 void sh2_pack(const SH2 *sh2, unsigned char *buff)
 102 {
 103         unsigned int *p;
 104
 105         memcpy(buff, sh2, SH2_REG_SIZE);
 106         p = (void *)(buff + SH2_REG_SIZE);
 107
 108         p[0] = sh2->pending_int_irq;
 109         p[1] = sh2->pending_int_vector;
 110 }
 111
 112 void sh2_unpack(SH2 *sh2, const unsigned char *buff)
 113 {
 114         unsigned int *p;
 115
 116         memcpy(sh2, buff, SH2_REG_SIZE);
 117         p = (void *)(buff + SH2_REG_SIZE);
 118
 119         sh2->pending_int_irq = p[0];
 120         sh2->pending_int_vector = p[1];
 121 }
 122
 123 #ifdef DRC_CMP
 124
 125 /* trace/compare */
 126 #include <stdio.h>
 127 #include <stdlib.h>
 128 #include <pico/memory.h>
 129
 130 static SH2 sh2ref[2];
 131 static int current_slave = -1;
 132 static unsigned int mem_val;
 133 static FILE *f;
 134
 135 #define SH2MAP_ADDR2OFFS_R(a) \
 136   ((((a) >> 25) & 3) | (((a) >> 27) & 0x1c))
 137
 138 static unsigned int local_read32(SH2 *sh2, u32 a)
 139 {
 140         const sh2_memmap *sh2_map = sh2->read16_map;
 141         uptr p;
 142
 143         sh2_map += SH2MAP_ADDR2OFFS_R(a);
 144         p = sh2_map->addr;
 145         if (!map_flag_set(p)) {
 146                 u16 *pd = (u16 *)((p << 1) + ((a & sh2_map->mask) & ~3));
 147                 return (pd[0] << 16) | pd[1];
 148         }
 149
 150         return 0;
 151 }
 152
 153 static void write_uint(unsigned char ctl, unsigned int v)
 154 {
 155         fwrite(&ctl, 1, 1, f);
 156         fwrite(&v, sizeof(v), 1, f);
 157 }
 158
 159 void do_sh2_trace(SH2 *current, int cycles)
 160 {
 161         SH2 *sh2o = &sh2ref[current->is_slave];
 162         u32 *regs_a = (void *)current;
 163         u32 *regs_o = (void *)sh2o;
 164         unsigned char v;
 165         u32 val;
 166         int i;
 167
 168         if (f == NULL)
 169                 f = fopen("tracelog", "wb");
 170
 171         if (current->is_slave != current_slave) {
 172                 current_slave = current->is_slave;
 173                 v = 0x80 | current->is_slave;
 174                 fwrite(&v, 1, 1, f);
 175         }
 176
 177         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 178                 if (i == 17) // ppc
 179                         continue;
 180                 if (regs_a[i] != regs_o[i]) {
 181                         write_uint(i, regs_a[i]);
 182                         regs_o[i] = regs_a[i];
 183                 }
 184         }
 185
 186         if (current->ea != sh2o->ea) {
 187                 write_uint(0x82, current->ea);
 188                 sh2o->ea = current->ea;
 189         }
 190         val = local_read32(current, current->ea);
 191         if (mem_val != val) {
 192                 write_uint(0x83, val);
 193                 mem_val = val;
 194         }
 195         write_uint(0x84, cycles);
 196 }
 197
 198 static const char *regnames[] = {
 199         "r0",  "r1",  "r2",  "r3",
 200         "r4",  "r5",  "r6",  "r7",
 201         "r8",  "r9",  "r10", "r11",
 202         "r12", "r13", "r14", "r15",
 203         "pc",  "ppc", "pr",  "sr",
 204         "gbr", "vbr", "mach","macl",
 205 };
 206
 207 void do_sh2_cmp(SH2 *current)
 208 {
 209         static int current_slave;
 210         static u32 current_val;
 211         SH2 *sh2o = &sh2ref[current->is_slave];
 212         u32 *regs_a = (void *)current;
 213         u32 *regs_o = (void *)sh2o;
 214         unsigned char code;
 215         int cycles_o = 666;
 216         u32 sr, val;
 217         int bad = 0;
 218         int cycles;
 219         int i, ret;
 220         char csh2;
 221
 222         if (f == NULL)
 223                 f = fopen("tracelog", "rb");
 224
 225         while (1) {
 226                 ret = fread(&code, 1, 1, f);
 227                 if (ret <= 0)
 228                         break;
 229                 if (code == 0x84) {
 230                         fread(&cycles_o, 1, 4, f);
 231                         break;
 232                 }
 233
 234                 switch (code) {
 235                 case 0x80:
 236                 case 0x81:
 237                         current_slave = code & 1;
 238                         break;
 239                 case 0x82:
 240                         fread(&sh2o->ea, 4, 1, f);
 241                         break;
 242                 case 0x83:
 243                         fread(&current_val, 4, 1, f);
 244                         break;
 245                 default:
 246                         if (code < offsetof(SH2, read8_map) / 4)
 247                                 fread(regs_o + code, 4, 1, f);
 248                         else {
 249                                 printf("invalid code: %02x\n", code);
 250                                 goto end;
 251                         }
 252                         break;
 253                 }
 254         }
 255
 256         if (ret <= 0) {
 257                 printf("EOF?\n");
 258                 goto end;
 259         }
 260
 261         if (current->is_slave != current_slave) {
 262                 printf("bad slave: %d %d\n", current->is_slave,
 263                         current_slave);
 264                 bad = 1;
 265         }
 266
 267         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 268                 if (i == 17 || i == 19) // ppc, sr
 269                         continue;
 270                 if (regs_a[i] != regs_o[i]) {
 271                         printf("bad %4s: %08x %08x\n",
 272                                 regnames[i], regs_a[i], regs_o[i]);
 273                         bad = 1;
 274                 }
 275         }
 276
 277         sr = current->sr & 0x3f3;
 278         cycles = (signed int)current->sr >> 12;
 279
 280         if (sr != sh2o->sr) {
 281                 printf("bad SR:  %03x %03x\n", sr, sh2o->sr);
 282                 bad = 1;
 283         }
 284
 285         if (cycles != cycles_o) {
 286                 printf("bad cycles: %d %d\n", cycles, cycles_o);
 287                 bad = 1;
 288         }
 289
 290         val = local_read32(current, sh2o->ea);
 291         if (val != current_val) {
 292                 printf("bad val @%08x: %08x %08x\n", sh2o->ea, val, current_val);
 293                 bad = 1;
 294         }
 295
 296         if (!bad) {
 297                 sh2o->ppc = current->pc;
 298                 return;
 299         }
 300
 301 end:
 302         printf("--\n");
 303         csh2 = current->is_slave ? 's' : 'm';
 304         for (i = 0; i < 16/2; i++)
 305                 printf("%csh2 r%d: %08x r%02d: %08x\n", csh2,
 306                         i, sh2o->r[i], i+8, sh2o->r[i+8]);
 307         printf("%csh2 PC: %08x  ,   %08x\n", csh2, sh2o->pc, sh2o->ppc);
 308         printf("%csh2 SR:      %03x  PR: %08x\n", csh2, sh2o->sr, sh2o->pr);
 309         exit(1);
 310 }
 311
 312 #endif // DRC_CMP