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- /*
- * PicoDrive
- * (C) notaz, 2009,2010
- *
- * This work is licensed under the terms of MAME license.
- * See COPYING file in the top-level directory.
- */
- #include <string.h>
- #include <stddef.h>
- #include "sh2.h"
- #include "../debug.h"
- #include "compiler.h"
- #define I 0xf0
- int sh2_init(SH2 *sh2, int is_slave, SH2 *other_sh2)
- {
- int ret = 0;
- unsigned int mult_m68k_to_sh2 = sh2->mult_m68k_to_sh2;
- unsigned int mult_sh2_to_m68k = sh2->mult_sh2_to_m68k;
- memset(sh2, 0, sizeof(*sh2));
- sh2->is_slave = is_slave;
- sh2->other_sh2 = other_sh2;
- sh2->mult_m68k_to_sh2 = mult_m68k_to_sh2;
- sh2->mult_sh2_to_m68k = mult_sh2_to_m68k;
- pdb_register_cpu(sh2, PDBCT_SH2, is_slave ? "ssh2" : "msh2");
- #ifdef DRC_SH2
- ret = sh2_drc_init(sh2);
- #endif
- return ret;
- }
- void sh2_finish(SH2 *sh2)
- {
- #ifdef DRC_SH2
- sh2_drc_finish(sh2);
- #endif
- }
- void sh2_reset(SH2 *sh2)
- {
- sh2->pc = p32x_sh2_read32(0, sh2);
- sh2->r[15] = p32x_sh2_read32(4, sh2);
- sh2->sr = I;
- sh2->vbr = 0;
- sh2->pending_int_irq = 0;
- }
- void sh2_do_irq(SH2 *sh2, int level, int vector)
- {
- sh2->sr &= 0x3f3;
- sh2->r[15] -= 4;
- p32x_sh2_write32(sh2->r[15], sh2->sr, sh2); /* push SR onto stack */
- sh2->r[15] -= 4;
- p32x_sh2_write32(sh2->r[15], sh2->pc, sh2); /* push PC onto stack */
- /* set I flags in SR */
- sh2->sr = (sh2->sr & ~I) | (level << 4);
- /* fetch PC */
- sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2);
- /* 13 cycles at best */
- sh2->icount -= 13;
- }
- int sh2_irl_irq(SH2 *sh2, int level, int nested_call)
- {
- int taken;
- sh2->pending_irl = level;
- if (level < sh2->pending_int_irq)
- level = sh2->pending_int_irq;
- sh2->pending_level = level;
- taken = (level > ((sh2->sr >> 4) & 0x0f));
- if (taken) {
- if (!nested_call) {
- // not in memhandler, so handle this now (recompiler friendly)
- // do this to avoid missing irqs that other SH2 might clear
- int vector = sh2->irq_callback(sh2, level);
- sh2_do_irq(sh2, level, vector);
- sh2->m68krcycles_done += C_SH2_TO_M68K(sh2, 13);
- }
- else
- sh2->test_irq = 1;
- }
- return taken;
- }
- void sh2_internal_irq(SH2 *sh2, int level, int vector)
- {
- // FIXME: multiple internal irqs not handled..
- // assuming internal irqs never clear until accepted
- sh2->pending_int_irq = level;
- sh2->pending_int_vector = vector;
- if (level > sh2->pending_level)
- sh2->pending_level = level;
- sh2->test_irq = 1;
- }
- #define SH2_REG_SIZE (offsetof(SH2, macl) + sizeof(sh2->macl))
- void sh2_pack(const SH2 *sh2, unsigned char *buff)
- {
- unsigned int *p;
- memcpy(buff, sh2, SH2_REG_SIZE);
- p = (void *)(buff + SH2_REG_SIZE);
- p[0] = sh2->pending_int_irq;
- p[1] = sh2->pending_int_vector;
- }
- void sh2_unpack(SH2 *sh2, const unsigned char *buff)
- {
- unsigned int *p;
- memcpy(sh2, buff, SH2_REG_SIZE);
- p = (void *)(buff + SH2_REG_SIZE);
- sh2->pending_int_irq = p[0];
- sh2->pending_int_vector = p[1];
- sh2->test_irq = 1;
- }
- #ifdef DRC_CMP
- /* trace/compare */
- #include <stdio.h>
- #include <stdlib.h>
- #include <pico/memory.h>
- #undef _USE_CZ80 // HACK
- #include <pico/pico_int.h>
- #include <pico/debug.h>
- static SH2 sh2ref[2];
- static unsigned int mem_val;
- static unsigned int local_read32(SH2 *sh2, u32 a)
- {
- const sh2_memmap *sh2_map = sh2->read16_map;
- u16 *pd;
- uptr p;
- sh2_map += (a >> 25);
- p = sh2_map->addr;
- if (!map_flag_set(p)) {
- pd = (u16 *)((p << 1) + ((a & sh2_map->mask) & ~1));
- return (pd[0] << 16) | pd[1];
- }
- if ((a & 0xfffff000) == 0xc0000000) {
- // data array
- pd = (u16 *)sh2->data_array + (a & 0xfff) / 2;
- return (pd[0] << 16) | pd[1];
- }
- if ((a & 0xdfffffc0) == 0x4000) {
- pd = &Pico32x.regs[(a & 0x3f) / 2];
- return (pd[0] << 16) | pd[1];
- }
- if ((a & 0xdffffe00) == 0x4200) {
- pd = &Pico32xMem->pal[(a & 0x1ff) / 2];
- return (pd[0] << 16) | pd[1];
- }
- return 0;
- }
- void do_sh2_trace(SH2 *current, int cycles)
- {
- static int current_slave = -1;
- static u32 current_m68k_pc;
- SH2 *sh2o = &sh2ref[current->is_slave];
- u32 *regs_a = (void *)current;
- u32 *regs_o = (void *)sh2o;
- unsigned char v;
- u32 val;
- int i;
- if (SekPc != current_m68k_pc) {
- current_m68k_pc = SekPc;
- tl_write_uint(CTL_M68KPC, current_m68k_pc);
- }
- if (current->is_slave != current_slave) {
- current_slave = current->is_slave;
- v = CTL_MASTERSLAVE | current->is_slave;
- tl_write(&v, sizeof(v));
- }
- for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
- if (i == 17) // ppc
- continue;
- if (regs_a[i] != regs_o[i]) {
- tl_write_uint(CTL_SH2_R + i, regs_a[i]);
- regs_o[i] = regs_a[i];
- }
- }
- if (current->ea != sh2o->ea) {
- tl_write_uint(CTL_EA, current->ea);
- sh2o->ea = current->ea;
- }
- val = local_read32(current, current->ea);
- if (mem_val != val) {
- tl_write_uint(CTL_EAVAL, val);
- mem_val = val;
- }
- tl_write_uint(CTL_CYCLES, cycles);
- }
- static const char *regnames[] = {
- "r0", "r1", "r2", "r3",
- "r4", "r5", "r6", "r7",
- "r8", "r9", "r10", "r11",
- "r12", "r13", "r14", "r15",
- "pc", "ppc", "pr", "sr",
- "gbr", "vbr", "mach","macl",
- };
- static void dump_regs(SH2 *sh2)
- {
- char csh2;
- int i;
- csh2 = sh2->is_slave ? 's' : 'm';
- for (i = 0; i < 16/2; i++)
- printf("%csh2 r%d: %08x r%02d: %08x\n", csh2,
- i, sh2->r[i], i+8, sh2->r[i+8]);
- printf("%csh2 PC: %08x , %08x\n", csh2, sh2->pc, sh2->ppc);
- printf("%csh2 SR: %03x PR: %08x\n", csh2, sh2->sr, sh2->pr);
- }
- void REGPARM(1) do_sh2_cmp(SH2 *current)
- {
- static int current_slave;
- static u32 current_val;
- SH2 *sh2o = &sh2ref[current->is_slave];
- u32 *regs_a = (void *)current;
- u32 *regs_o = (void *)sh2o;
- unsigned char code;
- int cycles_o = 666;
- u32 sr, val;
- int bad = 0;
- int cycles;
- int i, ret;
- #if 0
- sr = current->sr;
- current->sr &= 0x3f3;
- do_sh2_trace(current, (signed int)sr >> 12);
- current->sr = sr;
- return;
- #endif
- sh2ref[1].is_slave = 1;
- while (1) {
- ret = tl_read(&code, 1);
- if (ret <= 0)
- break;
- if (code == CTL_CYCLES) {
- tl_read(&cycles_o, 4);
- break;
- }
- switch (code) {
- case CTL_MASTERSLAVE:
- case CTL_MASTERSLAVE + 1:
- current_slave = code & 1;
- break;
- case CTL_EA:
- tl_read_uint(&sh2o->ea);
- break;
- case CTL_EAVAL:
- tl_read_uint(¤t_val);
- break;
- case CTL_M68KPC:
- tl_read_uint(&val);
- if (SekPc != val) {
- printf("m68k: %08x %08x\n", SekPc, val);
- bad = 1;
- }
- break;
- default:
- if (CTL_SH2_R <= code && code < CTL_SH2_R +
- offsetof(SH2, read8_map) / 4)
- {
- tl_read_uint(regs_o + code - CTL_SH2_R);
- }
- else
- {
- printf("wrong code: %02x\n", code);
- goto end;
- }
- break;
- }
- }
- if (ret <= 0) {
- printf("EOF?\n");
- goto end;
- }
- if (current->is_slave != current_slave) {
- printf("bad slave: %d %d\n", current->is_slave,
- current_slave);
- bad = 1;
- }
- for (i = 0; i < offsetof(SH2, read8_map) / 4; i++) {
- if (i == 17 || i == 19) // ppc, sr
- continue;
- if (regs_a[i] != regs_o[i]) {
- printf("bad %4s: %08x %08x\n",
- regnames[i], regs_a[i], regs_o[i]);
- bad = 1;
- }
- }
- sr = current->sr & 0x3f3;
- cycles = (signed int)current->sr >> 12;
- if (sr != sh2o->sr) {
- printf("bad SR: %03x %03x\n", sr, sh2o->sr);
- bad = 1;
- }
- if (cycles != cycles_o) {
- printf("bad cycles: %d %d\n", cycles, cycles_o);
- bad = 1;
- }
- val = local_read32(current, sh2o->ea);
- if (val != current_val) {
- printf("bad val @%08x: %08x %08x\n", sh2o->ea, val, current_val);
- bad = 1;
- }
- if (!bad) {
- sh2o->ppc = current->pc;
- return;
- }
- end:
- printf("--\n");
- dump_regs(sh2o);
- if (current->is_slave != current_slave)
- dump_regs(&sh2ref[current->is_slave ^ 1]);
- PDebugDumpMem();
- exit(1);
- }
- #endif // DRC_CMP
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