Bits CPU_Core_Full_Run(void) {
FullData inst;
while (CPU_Cycles-->0) {
#if C_DEBUG
cycle_count++;
#if C_HEAVY_DEBUG
if (DEBUG_HeavyIsBreakpoint()) {
FillFlags();
return debugCallback;
};
#endif
#endif
LoadIP();
inst.entry=cpu.code.big*0x200;
inst.prefix=cpu.code.big;
restartopcode:
inst.entry=(inst.entry & 0xffffff00) | Fetchb();
inst.code=OpCodeTable[inst.entry];
#include "core_full/load.h"
#include "core_full/op.h"
#include "core_full/save.h"
nextopcode:;
SaveIP();
continue;
illegalopcode:
LOG(LOG_CPU,LOG_NORMAL)("Illegal opcode");
CPU_Exception(0x6,0);
}
FillFlags();
return CBRET_NONE;
}
Bits CPU_Core_Simple_Run(void) {
while (CPU_Cycles-->0) {
LOADIP;
core.opcode_index=cpu.code.big*0x200;
core.prefixes=cpu.code.big;
core.ea_table=&EATable[cpu.code.big*256];
BaseDS=SegBase(ds);
BaseSS=SegBase(ss);
core.base_val_ds=ds;
#if C_DEBUG
#if C_HEAVY_DEBUG
if (DEBUG_HeavyIsBreakpoint()) {
FillFlags();
return debugCallback;
};
#endif
#endif
cycle_count++;
restart_opcode:
switch (core.opcode_index+Fetchb()) {
#include "core_normal/prefix_none.h"
#include "core_normal/prefix_0f.h"
#include "core_normal/prefix_66.h"
#include "core_normal/prefix_66_0f.h"
default:
illegal_opcode:
#if C_DEBUG
{
Bitu len=(GETIP-reg_eip);
LOADIP;
if (len>16) len=16;
char tempcode[16*2+1];char * writecode=tempcode;
for (;len>0;len--) {
// sprintf(writecode,"%X",mem_readb(core.cseip++));
writecode+=2;
}
LOG(LOG_CPU,LOG_NORMAL)("Illegal/Unhandled opcode %s",tempcode);
}
#endif
CPU_Exception(6,0);
continue;
}
SAVEIP;
}
FillFlags();
return CBRET_NONE;
decode_end:
SAVEIP;
FillFlags();
return CBRET_NONE;
}
Bits CPU_Core_Prefetch_Run(void) {
bool invalidate_pq=false;
while (CPU_Cycles-->0) {
if (invalidate_pq) {
pq_valid=false;
invalidate_pq=false;
}
LOADIP;
core.opcode_index=cpu.code.big*0x200;
core.prefixes=cpu.code.big;
core.ea_table=&EATable[cpu.code.big*256];
BaseDS=SegBase(ds);
BaseSS=SegBase(ss);
core.base_val_ds=ds;
#if C_DEBUG
#if C_HEAVY_DEBUG
if (DEBUG_HeavyIsBreakpoint()) {
FillFlags();
return debugCallback;
};
#endif
cycle_count++;
#endif
restart_opcode:
Bit8u next_opcode=Fetchb();
invalidate_pq=false;
if (core.opcode_index&OPCODE_0F) invalidate_pq=true;
else switch (next_opcode) {
case 0x70: case 0x71: case 0x72: case 0x73:
case 0x74: case 0x75: case 0x76: case 0x77:
case 0x78: case 0x79: case 0x7a: case 0x7b:
case 0x7c: case 0x7d: case 0x7e: case 0x7f: // jcc
case 0x9a: // call
case 0xc2: case 0xc3: // retn
case 0xc8: // enter
case 0xc9: // leave
case 0xca: case 0xcb: // retf
case 0xcc: // int3
case 0xcd: // int
case 0xce: // into
case 0xcf: // iret
case 0xe0: // loopnz
case 0xe1: // loopz
case 0xe2: // loop
case 0xe3: // jcxz
case 0xe8: // call
case 0xe9: case 0xea: case 0xeb: // jmp
case 0xff:
invalidate_pq=true;
break;
default:
break;
}
switch (core.opcode_index+next_opcode) {
#include "core_normal/prefix_none.h"
#include "core_normal/prefix_0f.h"
#include "core_normal/prefix_66.h"
#include "core_normal/prefix_66_0f.h"
default:
illegal_opcode:
#if C_DEBUG
{
bool ignore=false;
Bitu len=(GETIP-reg_eip);
LOADIP;
if (len>16) len=16;
char tempcode[16*2+1];char * writecode=tempcode;
if (ignore_opcode_63 && mem_readb(core.cseip) == 0x63)
ignore = true;
for (;len>0;len--) {
sprintf(writecode,"%02X",mem_readb(core.cseip++));
writecode+=2;
}
if (!ignore)
LOG(LOG_CPU,LOG_NORMAL)("Illegal/Unhandled opcode %s",tempcode);
}
#endif
CPU_Exception(6,0);
invalidate_pq=true;
continue;
}
SAVEIP;
}
FillFlags();
return CBRET_NONE;
decode_end:
SAVEIP;
FillFlags();
return CBRET_NONE;
}
Bits CPU_Core_Dynrec_Run(void) {
for (;;) {
// Determine the linear address of CS:EIP
PhysPt ip_point=SegPhys(cs)+reg_eip;
#if C_HEAVY_DEBUG
if (DEBUG_HeavyIsBreakpoint()) return debugCallback;
#endif
CodePageHandlerDynRec * chandler=0;
// see if the current page is present and contains code
if (GCC_UNLIKELY(MakeCodePage(ip_point,chandler))) {
// page not present, throw the exception
CPU_Exception(cpu.exception.which,cpu.exception.error);
continue;
}
// page doesn't contain code or is special
if (GCC_UNLIKELY(!chandler)) return CPU_Core_Normal_Run();
// find correct Dynamic Block to run
CacheBlockDynRec * block=chandler->FindCacheBlock(ip_point&4095);
if (!block) {
// no block found, thus translate the instruction stream
// unless the instruction is known to be modified
if (!chandler->invalidation_map || (chandler->invalidation_map[ip_point&4095]<4)) {
// translate up to 32 instructions
block=CreateCacheBlock(chandler,ip_point,32);
} else {
// let the normal core handle this instruction to avoid zero-sized blocks
Bitu old_cycles=CPU_Cycles;
CPU_Cycles=1;
Bits nc_retcode=CPU_Core_Normal_Run();
if (!nc_retcode) {
CPU_Cycles=old_cycles-1;
continue;
}
CPU_CycleLeft+=old_cycles;
return nc_retcode;
}
}
run_block:
cache.block.running=0;
// now we're ready to run the dynamic code block
// BlockReturn ret=((BlockReturn (*)(void))(block->cache.start))();
BlockReturn ret=core_dynrec.runcode(block->cache.start);
switch (ret) {
case BR_Iret:
#if C_HEAVY_DEBUG
if (DEBUG_HeavyIsBreakpoint()) return debugCallback;
#endif
if (!GETFLAG(TF)) {
if (GETFLAG(IF) && PIC_IRQCheck) return CBRET_NONE;
break;
}
// trapflag is set, switch to the trap-aware decoder
cpudecoder=CPU_Core_Dynrec_Trap_Run;
return CBRET_NONE;
case BR_Normal:
// the block was exited due to a non-predictable control flow
// modifying instruction (like ret) or some nontrivial cpu state
// changing instruction (for example switch to/from pmode),
// or the maximal number of instructions to translate was reached
#if C_HEAVY_DEBUG
if (DEBUG_HeavyIsBreakpoint()) return debugCallback;
#endif
break;
case BR_Cycles:
// cycles went negative, return from the core to handle
// external events, schedule the pic...
#if C_HEAVY_DEBUG
if (DEBUG_HeavyIsBreakpoint()) return debugCallback;
#endif
return CBRET_NONE;
case BR_CallBack:
// the callback code is executed in dosbox.conf, return the callback number
FillFlags();
return core_dynrec.callback;
case BR_SMCBlock:
// LOG_MSG("selfmodification of running block at %x:%x",SegValue(cs),reg_eip);
cpu.exception.which=0;
// fallthrough, let the normal core handle the block-modifying instruction
case BR_Opcode:
// some instruction has been encountered that could not be translated
// (thus it is not part of the code block), the normal core will
// handle this instruction
CPU_CycleLeft+=CPU_Cycles;
CPU_Cycles=1;
return CPU_Core_Normal_Run();
#if (C_DEBUG)
case BR_OpcodeFull:
CPU_CycleLeft+=CPU_Cycles;
CPU_Cycles=1;
return CPU_Core_Full_Run();
#endif
case BR_Link1:
case BR_Link2:
block=LinkBlocks(ret);
if (block) goto run_block;
break;
default:
E_Exit("Invalid return code %d", ret);
}
}
return CBRET_NONE;
}
Bits CPU_Core286_Normal_Run(void) {
if (CPU_Cycles <= 0)
return CBRET_NONE;
while (CPU_Cycles-->0) {
LOADIP;
core.prefixes=0;
core.opcode_index=0;
core.ea_table=&EATable[0];
BaseDS=SegBase(ds);
BaseSS=SegBase(ss);
core.base_val_ds=ds;
#if C_DEBUG
#if C_HEAVY_DEBUG
if (DEBUG_HeavyIsBreakpoint()) {
FillFlags();
return (Bits)debugCallback;
};
#endif
#endif
cycle_count++;
restart_opcode:
switch (core.opcode_index+Fetchb()) {
#include "core_normal/prefix_none.h"
#include "core_normal/prefix_0f.h"
default:
illegal_opcode:
#if C_DEBUG
{
bool ignore=false;
Bitu len=(GETIP-reg_eip);
LOADIP;
if (len>16) len=16;
char tempcode[16*2+1];char * writecode=tempcode;
if (ignore_opcode_63 && mem_readb(core.cseip) == 0x63)
ignore = true;
for (;len>0;len--) {
sprintf(writecode,"%02X",mem_readb(core.cseip++));
writecode+=2;
}
if (!ignore)
LOG(LOG_CPU,LOG_NORMAL)("Illegal/Unhandled opcode %s",tempcode);
}
#endif
CPU_Exception(6,0);
continue;
gp_fault:
CPU_Exception(EXCEPTION_GP,0);
continue;
}
SAVEIP;
}
FillFlags();
return CBRET_NONE;
/* 8086/286 multiple prefix interrupt bug emulation.
* If an instruction is interrupted, only the last prefix is restarted.
* See also [https://www.pcjs.org/pubs/pc/reference/intel/8086/] and [https://www.youtube.com/watch?v=6FC-tcwMBnU] */
prefix_out:
SAVEIP_PREFIX;
FillFlags();
return CBRET_NONE;
decode_end:
SAVEIP;
FillFlags();
return CBRET_NONE;
}
Bits CPU_Core_Normal_Run(void) {
while (CPU_Cycles-->0) {
LOADIP;
dosbox_check_nonrecursive_pf_cs = SegValue(cs);
dosbox_check_nonrecursive_pf_eip = reg_eip;
core.opcode_index=cpu.code.big*0x200;
core.prefixes=cpu.code.big;
core.ea_table=&EATable[cpu.code.big*256];
BaseDS=SegBase(ds);
BaseSS=SegBase(ss);
core.base_val_ds=ds;
#if C_DEBUG
#if C_HEAVY_DEBUG
if (DEBUG_HeavyIsBreakpoint()) {
FillFlags();
return debugCallback;
};
#endif
#endif
cycle_count++;
restart_opcode:
switch (core.opcode_index+Fetchb()) {
#include "core_normal/prefix_none.h"
#include "core_normal/prefix_0f.h"
#include "core_normal/prefix_66.h"
#include "core_normal/prefix_66_0f.h"
default:
illegal_opcode:
#if C_DEBUG
{
bool ignore=false;
Bitu len=(GETIP-reg_eip);
LOADIP;
if (len>16) len=16;
char tempcode[16*2+1];char * writecode=tempcode;
if (ignore_opcode_63 && mem_readb(core.cseip) == 0x63)
ignore = true;
for (;len>0;len--) {
sprintf(writecode,"%02X",mem_readb(core.cseip++));
writecode+=2;
}
if (!ignore)
LOG(LOG_CPU,LOG_NORMAL)("Illegal/Unhandled opcode %s",tempcode);
}
#endif
CPU_Exception(6,0);
continue;
gp_fault:
LOG_MSG("Segment limit violation");
CPU_Exception(EXCEPTION_GP,0);
continue;
}
SAVEIP;
}
FillFlags();
return CBRET_NONE;
decode_end:
SAVEIP;
FillFlags();
return CBRET_NONE;
}