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