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         sh2->test_irq = 1;
 122 }
 123
 124 #ifdef DRC_CMP
 125
 126 /* trace/compare */
 127 #include <stdio.h>
 128 #include <stdlib.h>
 129 #include <pico/memory.h>
 130
 131 static SH2 sh2ref[2];
 132 static int current_slave = -1;
 133 static unsigned int mem_val;
 134 static FILE *f;
 135
 136 #define SH2MAP_ADDR2OFFS_R(a) \
 137   ((((a) >> 25) & 3) | (((a) >> 27) & 0x1c))
 138
 139 static unsigned int local_read32(SH2 *sh2, u32 a)
 140 {
 141         const sh2_memmap *sh2_map = sh2->read16_map;
 142         uptr p;
 143
 144         sh2_map += SH2MAP_ADDR2OFFS_R(a);
 145         p = sh2_map->addr;
 146         if (!map_flag_set(p)) {
 147                 u16 *pd = (u16 *)((p << 1) + ((a & sh2_map->mask) & ~3));
 148                 return (pd[0] << 16) | pd[1];
 149         }
 150
 151         return 0;
 152 }
 153
 154 static void write_uint(unsigned char ctl, unsigned int v)
 155 {
 156         fwrite(&ctl, 1, 1, f);
 157         fwrite(&v, sizeof(v), 1, f);
 158 }
 159
 160 void do_sh2_trace(SH2 *current, int cycles)
 161 {
 162         SH2 *sh2o = &sh2ref[current->is_slave];
 163         u32 *regs_a = (void *)current;
 164         u32 *regs_o = (void *)sh2o;
 165         unsigned char v;
 166         u32 val;
 167         int i;
 168
 169         if (f == NULL)
 170                 f = fopen("tracelog", "wb");
 171
 172         if (current->is_slave != current_slave) {
 173                 current_slave = current->is_slave;
 174                 v = 0x80 | current->is_slave;
 175                 fwrite(&v, 1, 1, f);
 176         }
 177
 178         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 179                 if (i == 17) // ppc
 180                         continue;
 181                 if (regs_a[i] != regs_o[i]) {
 182                         write_uint(i, regs_a[i]);
 183                         regs_o[i] = regs_a[i];
 184                 }
 185         }
 186
 187         if (current->ea != sh2o->ea) {
 188                 write_uint(0x82, current->ea);
 189                 sh2o->ea = current->ea;
 190         }
 191         val = local_read32(current, current->ea);
 192         if (mem_val != val) {
 193                 write_uint(0x83, val);
 194                 mem_val = val;
 195         }
 196         write_uint(0x84, cycles);
 197 }
 198
 199 static const char *regnames[] = {
 200         "r0",  "r1",  "r2",  "r3",
 201         "r4",  "r5",  "r6",  "r7",
 202         "r8",  "r9",  "r10", "r11",
 203         "r12", "r13", "r14", "r15",
 204         "pc",  "ppc", "pr",  "sr",
 205         "gbr", "vbr", "mach","macl",
 206 };
 207
 208 void do_sh2_cmp(SH2 *current)
 209 {
 210         static int current_slave;
 211         static u32 current_val;
 212         SH2 *sh2o = &sh2ref[current->is_slave];
 213         u32 *regs_a = (void *)current;
 214         u32 *regs_o = (void *)sh2o;
 215         unsigned char code;
 216         int cycles_o = 666;
 217         u32 sr, val;
 218         int bad = 0;
 219         int cycles;
 220         int i, ret;
 221         char csh2;
 222
 223         if (f == NULL)
 224                 f = fopen("tracelog", "rb");
 225
 226         while (1) {
 227                 ret = fread(&code, 1, 1, f);
 228                 if (ret <= 0)
 229                         break;
 230                 if (code == 0x84) {
 231                         fread(&cycles_o, 1, 4, f);
 232                         break;
 233                 }
 234
 235                 switch (code) {
 236                 case 0x80:
 237                 case 0x81:
 238                         current_slave = code & 1;
 239                         break;
 240                 case 0x82:
 241                         fread(&sh2o->ea, 4, 1, f);
 242                         break;
 243                 case 0x83:
 244                         fread(&current_val, 4, 1, f);
 245                         break;
 246                 default:
 247                         if (code < offsetof(SH2, read8_map) / 4)
 248                                 fread(regs_o + code, 4, 1, f);
 249                         else {
 250                                 printf("invalid code: %02x\n", code);
 251                                 goto end;
 252                         }
 253                         break;
 254                 }
 255         }
 256
 257         if (ret <= 0) {
 258                 printf("EOF?\n");
 259                 goto end;
 260         }
 261
 262         if (current->is_slave != current_slave) {
 263                 printf("bad slave: %d %d\n", current->is_slave,
 264                         current_slave);
 265                 bad = 1;
 266         }
 267
 268         for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
 269                 if (i == 17 || i == 19) // ppc, sr
 270                         continue;
 271                 if (regs_a[i] != regs_o[i]) {
 272                         printf("bad %4s: %08x %08x\n",
 273                                 regnames[i], regs_a[i], regs_o[i]);
 274                         bad = 1;
 275                 }
 276         }
 277
 278         sr = current->sr & 0x3f3;
 279         cycles = (signed int)current->sr >> 12;
 280
 281         if (sr != sh2o->sr) {
 282                 printf("bad SR:  %03x %03x\n", sr, sh2o->sr);
 283                 bad = 1;
 284         }
 285
 286         if (cycles != cycles_o) {
 287                 printf("bad cycles: %d %d\n", cycles, cycles_o);
 288                 bad = 1;
 289         }
 290
 291         val = local_read32(current, sh2o->ea);
 292         if (val != current_val) {
 293                 printf("bad val @%08x: %08x %08x\n", sh2o->ea, val, current_val);
 294                 bad = 1;
 295         }
 296
 297         if (!bad) {
 298                 sh2o->ppc = current->pc;
 299                 return;
 300         }
 301
 302 end:
 303         printf("--\n");
 304         csh2 = current->is_slave ? 's' : 'm';
 305         for (i = 0; i < 16/2; i++)
 306                 printf("%csh2 r%d: %08x r%02d: %08x\n", csh2,
 307                         i, sh2o->r[i], i+8, sh2o->r[i+8]);
 308         printf("%csh2 PC: %08x  ,   %08x\n", csh2, sh2o->pc, sh2o->ppc);
 309         printf("%csh2 SR:      %03x  PR: %08x\n", csh2, sh2o->sr, sh2o->pr);
 310         exit(1);
 311 }
 312
 313 #endif // DRC_CMP