libpcsxcore/psxhle.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team              *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA.           *
  18  ***************************************************************************/
  19
  20 /*
  21 * Internal PSX HLE functions.
  22 */
  23
  24 #include "psxhle.h"
  25
  26 #if 0
  27 #define PSXHLE_LOG SysPrintf
  28 #else
  29 #define PSXHLE_LOG(...)
  30 #endif
  31
  32 static void hleDummy() {
  33         psxRegs.pc = psxRegs.GPR.n.ra;
  34
  35         psxBranchTest();
  36 }
  37
  38 static void hleA0() {
  39         u32 call = psxRegs.GPR.n.t1 & 0xff;
  40
  41         if (biosA0[call]) biosA0[call]();
  42
  43         psxBranchTest();
  44 }
  45
  46 static void hleB0() {
  47         u32 call = psxRegs.GPR.n.t1 & 0xff;
  48
  49         if (biosB0[call]) biosB0[call]();
  50
  51         psxBranchTest();
  52 }
  53
  54 static void hleC0() {
  55         u32 call = psxRegs.GPR.n.t1 & 0xff;
  56
  57         if (biosC0[call]) biosC0[call]();
  58
  59         psxBranchTest();
  60 }
  61
  62 static void hleBootstrap() { // 0xbfc00000
  63         PSXHLE_LOG("hleBootstrap\n");
  64         CheckCdrom();
  65         LoadCdrom();
  66         PSXHLE_LOG("CdromLabel: \"%s\": PC = %8.8lx (SP = %8.8lx)\n", CdromLabel, psxRegs.pc, psxRegs.GPR.n.sp);
  67 }
  68
  69 typedef struct {
  70         u32 _pc0;
  71         u32 gp0;
  72         u32 t_addr;
  73         u32 t_size;
  74         u32 d_addr;
  75         u32 d_size;
  76         u32 b_addr;
  77         u32 b_size;
  78         u32 S_addr;
  79         u32 s_size;
  80         u32 _sp,_fp,_gp,ret,base;
  81 } EXEC;
  82
  83 static void hleExecRet() {
  84         EXEC *header = (EXEC*)PSXM(psxRegs.GPR.n.s0);
  85
  86         PSXHLE_LOG("ExecRet %x: %x\n", psxRegs.GPR.n.s0, header->ret);
  87
  88         psxRegs.GPR.n.ra = header->ret;
  89         psxRegs.GPR.n.sp = header->_sp;
  90         psxRegs.GPR.n.s8 = header->_fp;
  91         psxRegs.GPR.n.gp = header->_gp;
  92         psxRegs.GPR.n.s0 = header->base;
  93
  94         psxRegs.GPR.n.v0 = 1;
  95         psxRegs.pc = psxRegs.GPR.n.ra;
  96 }
  97
  98 void (* const psxHLEt[8])() = {
  99         hleDummy, hleA0, hleB0, hleC0,
 100         hleBootstrap, hleExecRet,
 101         hleDummy, hleDummy
 102 };