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 #include <pico/debug.h>
 133
 134 static SH2 sh2ref[2];
 135 static int current_slave = -1;
 136 static unsigned int mem_val;
 137 static FILE *f;
 138
 139 #define SH2MAP_ADDR2OFFS_R(a) \
 140   ((((a) >> 25) & 3) | (((a) >> 27) & 0x1c))
 141
 142 static unsigned int local_read32(SH2 *sh2, u32 a)
 143 {
 144         const sh2_memmap *sh2_map = sh2->read16_map;
 145         uptr p;
 146
 147         sh2_map += SH2MAP_ADDR2OFFS_R(a);
 148         p = sh2_map->addr;
 149         if (!map_flag_set(p)) {
 150                 u16 *pd = (u16 *)((p << 1) + ((a & sh2_map->mask) & ~3));
 151                 return (pd[0] << 16) | pd[1];
 152         }
 153
 154         return 0;
 155 }
 156
 157 static void write_uint(unsigned char ctl, unsigned int v)
 158 {
 159         fwrite(&ctl, 1, 1, f);
 160         fwrite(&v, sizeof(v), 1, f);
 161 }
 162
 163 void do_sh2_trace(SH2 *current, int cycles)
 164 {
 165         SH2 *sh2o = &sh2ref[current->is_slave];
 166         u32 *regs_a = (void *)current;
 167         u32 *regs_o = (void *)sh2o;
 168         unsigned char v;
 169         u32 val;
 170         int i;
 171
 172         if (f == NULL)
 173                 f = fopen("tracelog", "wb");
 174
 175         if (current->is_slave != current_slave) {
 176                 current_slave = current->is_slave;
 177                 v = 0x80 | current->is_slave;
 178                 fwrite(&v, 1, 1, f);
 179         }
 180
 181         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 182                 if (i == 17) // ppc
 183                         continue;
 184                 if (regs_a[i] != regs_o[i]) {
 185                         write_uint(i, regs_a[i]);
 186                         regs_o[i] = regs_a[i];
 187                 }
 188         }
 189
 190         if (current->ea != sh2o->ea) {
 191                 write_uint(0x82, current->ea);
 192                 sh2o->ea = current->ea;
 193         }
 194         val = local_read32(current, current->ea);
 195         if (mem_val != val) {
 196                 write_uint(0x83, val);
 197                 mem_val = val;
 198         }
 199         write_uint(0x84, cycles);
 200 }
 201
 202 static const char *regnames[] = {
 203         "r0",  "r1",  "r2",  "r3",
 204         "r4",  "r5",  "r6",  "r7",
 205         "r8",  "r9",  "r10", "r11",
 206         "r12", "r13", "r14", "r15",
 207         "pc",  "ppc", "pr",  "sr",
 208         "gbr", "vbr", "mach","macl",
 209 };
 210
 211 void do_sh2_cmp(SH2 *current)
 212 {
 213         static int current_slave;
 214         static u32 current_val;
 215         SH2 *sh2o = &sh2ref[current->is_slave];
 216         u32 *regs_a = (void *)current;
 217         u32 *regs_o = (void *)sh2o;
 218         unsigned char code;
 219         int cycles_o = 666;
 220         u32 sr, val;
 221         int bad = 0;
 222         int cycles;
 223         int i, ret;
 224         char csh2;
 225
 226         if (f == NULL)
 227                 f = fopen("tracelog", "rb");
 228
 229         while (1) {
 230                 ret = fread(&code, 1, 1, f);
 231                 if (ret <= 0)
 232                         break;
 233                 if (code == 0x84) {
 234                         fread(&cycles_o, 1, 4, f);
 235                         break;
 236                 }
 237
 238                 switch (code) {
 239                 case 0x80:
 240                 case 0x81:
 241                         current_slave = code & 1;
 242                         break;
 243                 case 0x82:
 244                         fread(&sh2o->ea, 4, 1, f);
 245                         break;
 246                 case 0x83:
 247                         fread(&current_val, 4, 1, f);
 248                         break;
 249                 default:
 250                         if (code < offsetof(SH2, read8_map) / 4)
 251                                 fread(regs_o + code, 4, 1, f);
 252                         else {
 253                                 printf("invalid code: %02x\n", code);
 254                                 goto end;
 255                         }
 256                         break;
 257                 }
 258         }
 259
 260         if (ret <= 0) {
 261                 printf("EOF?\n");
 262                 goto end;
 263         }
 264
 265         if (current->is_slave != current_slave) {
 266                 printf("bad slave: %d %d\n", current->is_slave,
 267                         current_slave);
 268                 bad = 1;
 269         }
 270
 271         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 272                 if (i == 17 || i == 19) // ppc, sr
 273                         continue;
 274                 if (regs_a[i] != regs_o[i]) {
 275                         printf("bad %4s: %08x %08x\n",
 276                                 regnames[i], regs_a[i], regs_o[i]);
 277                         bad = 1;
 278                 }
 279         }
 280
 281         sr = current->sr & 0x3f3;
 282         cycles = (signed int)current->sr >> 12;
 283
 284         if (sr != sh2o->sr) {
 285                 printf("bad SR:  %03x %03x\n", sr, sh2o->sr);
 286                 bad = 1;
 287         }
 288
 289         if (cycles != cycles_o) {
 290                 printf("bad cycles: %d %d\n", cycles, cycles_o);
 291                 bad = 1;
 292         }
 293
 294         val = local_read32(current, sh2o->ea);
 295         if (val != current_val) {
 296                 printf("bad val @%08x: %08x %08x\n", sh2o->ea, val, current_val);
 297                 bad = 1;
 298         }
 299
 300         if (!bad) {
 301                 sh2o->ppc = current->pc;
 302                 return;
 303         }
 304
 305 end:
 306         printf("--\n");
 307         csh2 = current->is_slave ? 's' : 'm';
 308         for (i = 0; i < 16/2; i++)
 309                 printf("%csh2 r%d: %08x r%02d: %08x\n", csh2,
 310                         i, sh2o->r[i], i+8, sh2o->r[i+8]);
 311         printf("%csh2 PC: %08x  ,   %08x\n", csh2, sh2o->pc, sh2o->ppc);
 312         printf("%csh2 SR:      %03x  PR: %08x\n", csh2, sh2o->sr, sh2o->pr);
 313         PDebugDumpMem();
 314         exit(1);
 315 }
 316
 317 #endif // DRC_CMP