| 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(¤t_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 |