IO Exceptions (wd)
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2094
This commit is contained in:
Peter Veenstra
parent
36cc519170
commit
c99f8e8710
4 changed files with 272 additions and 21 deletions
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@ -16,9 +16,16 @@
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* $Id: iohandler.cpp,v 1.15 2004-12-28 16:13:26 qbix79 Exp $ */
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#include "dosbox.h"
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#include "inout.h"
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#include <string.h>
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#include "cpu.h"
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#include "../src/cpu/lazyflags.h"
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#include "callback.h"
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IO_WriteHandler * io_writehandlers[3][IO_MAX];
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IO_ReadHandler * io_readhandlers[3][IO_MAX];
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@ -99,10 +106,236 @@ void IO_FreeWriteHandler(Bitu port,Bitu mask,Bitu range) {
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}
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struct IOF_Entry {
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Bitu cs;
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Bitu eip;
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};
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#define IOF_QUEUESIZE 16
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struct {
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Bitu used;
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IOF_Entry entries[IOF_QUEUESIZE];
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} iof_queue;
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static Bits IOFaultCore(void) {
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CPU_CycleLeft+=CPU_Cycles;
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CPU_Cycles=1;
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Bitu ret=CPU_Core_Full_Run();
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CPU_CycleLeft+=CPU_Cycles;
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if (ret<0) E_Exit("Got a dosbox close machine in IO-fault core?");
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if (ret)
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return ret;
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if (!iof_queue.used) E_Exit("IO-faul Core without IO-faul");
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IOF_Entry * entry=&iof_queue.entries[iof_queue.used-1];
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if (entry->cs == SegValue(cs) && entry->eip==reg_eip)
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return -1;
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return 0;
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}
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Bitu DEBUG_EnableDebugger();
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void IO_WriteB(Bitu port,Bitu val) {
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if (GETFLAG(VM) && (CPU_IO_Exception(port,1))) {
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LazyFlags old_lflags;
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memcpy(&old_lflags,&lflags,sizeof(LazyFlags));
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CPU_Decoder * old_cpudecoder;
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old_cpudecoder=cpudecoder;
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cpudecoder=&IOFaultCore;
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IOF_Entry * entry=&iof_queue.entries[iof_queue.used++];
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entry->cs=SegValue(cs);
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entry->eip=reg_eip;
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CPU_Push16(SegValue(cs));
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CPU_Push16(reg_ip);
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Bit8u old_al = reg_al;
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Bit16u old_dx = reg_dx;
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reg_al = val;
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reg_dx = port;
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RealPt icb = CALLBACK_RealPointer(call_priv_io);
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SegSet16(cs,RealSeg(icb));
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reg_eip = RealOff(icb)+0x08;
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FillFlags();
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CPU_Exception(cpu.exception.which,cpu.exception.error);
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DOSBOX_RunMachine();
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iof_queue.used--;
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reg_al = old_al;
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reg_dx = old_dx;
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memcpy(&lflags,&old_lflags,sizeof(LazyFlags));
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cpudecoder=old_cpudecoder;
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}
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else io_writehandlers[0][port](port,val,1);
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};
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void IO_WriteW(Bitu port,Bitu val) {
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if (GETFLAG(VM) && (CPU_IO_Exception(port,2))) {
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LazyFlags old_lflags;
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memcpy(&old_lflags,&lflags,sizeof(LazyFlags));
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CPU_Decoder * old_cpudecoder;
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old_cpudecoder=cpudecoder;
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cpudecoder=&IOFaultCore;
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IOF_Entry * entry=&iof_queue.entries[iof_queue.used++];
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entry->cs=SegValue(cs);
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entry->eip=reg_eip;
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CPU_Push16(SegValue(cs));
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CPU_Push16(reg_ip);
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Bit16u old_ax = reg_ax;
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Bit16u old_dx = reg_dx;
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reg_al = val;
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reg_dx = port;
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RealPt icb = CALLBACK_RealPointer(call_priv_io);
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SegSet16(cs,RealSeg(icb));
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reg_eip = RealOff(icb)+0x0a;
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FillFlags();
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CPU_Exception(cpu.exception.which,cpu.exception.error);
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DOSBOX_RunMachine();
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iof_queue.used--;
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reg_ax = old_ax;
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reg_dx = old_dx;
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memcpy(&lflags,&old_lflags,sizeof(LazyFlags));
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cpudecoder=old_cpudecoder;
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}
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else io_writehandlers[1][port](port,val,2);
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};
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void IO_WriteD(Bitu port,Bitu val) {
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if (GETFLAG(VM) && (CPU_IO_Exception(port,4))) {
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LazyFlags old_lflags;
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memcpy(&old_lflags,&lflags,sizeof(LazyFlags));
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CPU_Decoder * old_cpudecoder;
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old_cpudecoder=cpudecoder;
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cpudecoder=&IOFaultCore;
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IOF_Entry * entry=&iof_queue.entries[iof_queue.used++];
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entry->cs=SegValue(cs);
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entry->eip=reg_eip;
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CPU_Push16(SegValue(cs));
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CPU_Push16(reg_ip);
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Bit32u old_eax = reg_eax;
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Bit16u old_dx = reg_dx;
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reg_al = val;
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reg_dx = port;
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RealPt icb = CALLBACK_RealPointer(call_priv_io);
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SegSet16(cs,RealSeg(icb));
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reg_eip = RealOff(icb)+0x0c;
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FillFlags();
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CPU_Exception(cpu.exception.which,cpu.exception.error);
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DOSBOX_RunMachine();
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iof_queue.used--;
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reg_eax = old_eax;
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reg_dx = old_dx;
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memcpy(&lflags,&old_lflags,sizeof(LazyFlags));
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cpudecoder=old_cpudecoder;
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}
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else io_writehandlers[2][port](port,val,4);
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};
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Bitu IO_ReadB(Bitu port) {
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if (GETFLAG(VM) && (CPU_IO_Exception(port,1))) {
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LazyFlags old_lflags;
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memcpy(&old_lflags,&lflags,sizeof(LazyFlags));
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CPU_Decoder * old_cpudecoder;
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old_cpudecoder=cpudecoder;
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cpudecoder=&IOFaultCore;
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IOF_Entry * entry=&iof_queue.entries[iof_queue.used++];
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entry->cs=SegValue(cs);
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entry->eip=reg_eip;
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CPU_Push16(SegValue(cs));
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CPU_Push16(reg_ip);
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Bit16u old_dx = reg_dx;
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reg_dx = port;
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RealPt icb = CALLBACK_RealPointer(call_priv_io);
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SegSet16(cs,RealSeg(icb));
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reg_eip = RealOff(icb)+0x00;
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FillFlags();
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CPU_Exception(cpu.exception.which,cpu.exception.error);
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DOSBOX_RunMachine();
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iof_queue.used--;
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Bitu retval = reg_al;
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reg_dx = old_dx;
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memcpy(&lflags,&old_lflags,sizeof(LazyFlags));
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cpudecoder=old_cpudecoder;
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return retval;
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}
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else return io_readhandlers[0][port](port,1);
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};
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Bitu IO_ReadW(Bitu port) {
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if (GETFLAG(VM) && (CPU_IO_Exception(port,2))) {
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LazyFlags old_lflags;
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memcpy(&old_lflags,&lflags,sizeof(LazyFlags));
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CPU_Decoder * old_cpudecoder;
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old_cpudecoder=cpudecoder;
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cpudecoder=&IOFaultCore;
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IOF_Entry * entry=&iof_queue.entries[iof_queue.used++];
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entry->cs=SegValue(cs);
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entry->eip=reg_eip;
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CPU_Push16(SegValue(cs));
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CPU_Push16(reg_ip);
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Bit16u old_dx = reg_dx;
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reg_dx = port;
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RealPt icb = CALLBACK_RealPointer(call_priv_io);
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SegSet16(cs,RealSeg(icb));
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reg_eip = RealOff(icb)+0x02;
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FillFlags();
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CPU_Exception(cpu.exception.which,cpu.exception.error);
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DOSBOX_RunMachine();
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iof_queue.used--;
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Bitu retval = reg_ax;
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reg_dx = old_dx;
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memcpy(&lflags,&old_lflags,sizeof(LazyFlags));
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cpudecoder=old_cpudecoder;
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return retval;
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}
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else return io_readhandlers[1][port](port,2);
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};
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Bitu IO_ReadD(Bitu port) {
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if (GETFLAG(VM) && (CPU_IO_Exception(port,4))) {
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LazyFlags old_lflags;
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memcpy(&old_lflags,&lflags,sizeof(LazyFlags));
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CPU_Decoder * old_cpudecoder;
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old_cpudecoder=cpudecoder;
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cpudecoder=&IOFaultCore;
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IOF_Entry * entry=&iof_queue.entries[iof_queue.used++];
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entry->cs=SegValue(cs);
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entry->eip=reg_eip;
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CPU_Push16(SegValue(cs));
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CPU_Push16(reg_ip);
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Bit16u old_dx = reg_dx;
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reg_dx = port;
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RealPt icb = CALLBACK_RealPointer(call_priv_io);
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SegSet16(cs,RealSeg(icb));
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reg_eip = RealOff(icb)+0x04;
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FillFlags();
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CPU_Exception(cpu.exception.which,cpu.exception.error);
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DOSBOX_RunMachine();
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iof_queue.used--;
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Bitu retval = reg_eax;
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reg_dx = old_dx;
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memcpy(&lflags,&old_lflags,sizeof(LazyFlags));
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cpudecoder=old_cpudecoder;
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return retval;
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}
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else return io_readhandlers[2][port](port,4);
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};
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void IO_Init(Section * sect) {
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iof_queue.used=0;
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IO_FreeReadHandler(0,IO_MA,IO_MAX);
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IO_FreeWriteHandler(0,IO_MA,IO_MAX);
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}
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