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Updated pagefault handling in the normal core. #15

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Updated pagefault handling in the normal core. #15

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28d2178
Updated pagefault handling in the normal core.
nturley3 Jul 12, 2022
dea008a
Updated README
nturley3 Jul 14, 2022
b282cfc
Merge pull request #19 from nturley3/master
nturley3 Nov 25, 2022
b1b8bca
Merge branch 'master' into pagefault-update
nturley3 May 27, 2024
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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -32,6 +32,7 @@ Patches/Customizations
* Patched to support max memory of 383MB. This can be used for running Win9x (although not tested)
* Apple Pencil gesture support
* Additional DOS support commands (such as XCOPY, DOSIDLE, MEM etc). See branch `vfile-additions` for more information.
* Updated pagefault handling for normal core. Disables pagefault recursion to enable better support for running Windows 95. See [Vogons discussion](https://www.vogons.org/viewtopic.php?f=41&t=36629)

Acknowledgements
====
Expand Down
11 changes: 6 additions & 5 deletions dosbox/include/cpu.h
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Expand Up @@ -41,11 +41,10 @@


#define CPU_ARCHTYPE_MIXED 0xff
#define CPU_ARCHTYPE_386SLOW 0x30
#define CPU_ARCHTYPE_386FAST 0x35
#define CPU_ARCHTYPE_486OLDSLOW 0x40
#define CPU_ARCHTYPE_486NEWSLOW 0x45
#define CPU_ARCHTYPE_PENTIUMSLOW 0x50
#define CPU_ARCHTYPE_386 0x35
#define CPU_ARCHTYPE_486OLD 0x40
#define CPU_ARCHTYPE_486NEW 0x45
#define CPU_ARCHTYPE_PENTIUM 0x50

/* CPU Cycle Timing */
extern Bit32s CPU_Cycles;
Expand Down Expand Up @@ -89,6 +88,7 @@ void CPU_Reset_AutoAdjust(void);

extern Bit16u parity_lookup[256];

void CPU_SetCPL(Bitu newcpl);
bool CPU_LLDT(Bitu selector);
bool CPU_LTR(Bitu selector);
void CPU_LIDT(Bitu limit,Bitu base);
Expand Down Expand Up @@ -182,6 +182,7 @@ void CPU_SetFlags(Bitu word,Bitu mask);
#define CR0_FPUEMULATION 0x00000004
#define CR0_TASKSWITCH 0x00000008
#define CR0_FPUPRESENT 0x00000010
#define CR0_WRITEPROTECT 0x00010000
#define CR0_PAGING 0x80000000

// reasons for triggering a debug exception
Expand Down
15 changes: 15 additions & 0 deletions dosbox/include/paging.h
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Expand Up @@ -82,6 +82,8 @@ class PageHandler {
/* Some other functions */
void PAGING_Enable(bool enabled);
bool PAGING_Enabled(void);
void PAGING_SetWP(bool wp);
void PAGING_SwitchCPL(bool isUser);

Bitu PAGING_GetDirBase(void);
void PAGING_SetDirBase(Bitu cr3);
Expand Down Expand Up @@ -154,6 +156,7 @@ typedef struct {
struct PagingBlock {
Bitu cr3;
Bitu cr2;
bool wp;
struct {
Bitu page;
PhysPt addr;
Expand All @@ -174,6 +177,18 @@ struct PagingBlock {
Bitu used;
Bit32u entries[PAGING_LINKS];
} links;
struct {
Bitu used;
Bit32u entries[PAGING_LINKS];
} ur_links;
struct {
Bitu used;
Bit32u entries[PAGING_LINKS];
} krw_links;
struct {
Bitu used;
Bit32u entries[PAGING_LINKS];
} kr_links; // WP-only
Bit32u firstmb[LINK_START];
bool enabled;
};
Expand Down
2 changes: 1 addition & 1 deletion dosbox/src/cpu/core_full/load.h
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Expand Up @@ -506,7 +506,7 @@ switch (inst.code.load) {
CPU_SW_Interrupt_NoIOPLCheck(1,GetIP());
continue;
case D_RDTSC: {
if (CPU_ArchitectureType<CPU_ARCHTYPE_PENTIUMSLOW) goto illegalopcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_PENTIUM) goto illegalopcode;
Bit64s tsc=(Bit64s)(PIC_FullIndex()*(double)(CPU_CycleAutoAdjust?70000:CPU_CycleMax));
reg_edx=(Bit32u)(tsc>>32);
reg_eax=(Bit32u)(tsc&0xffffffff);
Expand Down
6 changes: 3 additions & 3 deletions dosbox/src/cpu/core_full/op.h
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Expand Up @@ -603,15 +603,15 @@ switch (inst.code.op) {
inst_op1_d&=~(1 << (inst_op2_d & 31));
break;
case O_BSWAPw:
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegalopcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegalopcode;
BSWAPW(inst_op1_w);
break;
case O_BSWAPd:
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegalopcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegalopcode;
BSWAPD(inst_op1_d);
break;
case O_CMPXCHG:
if (CPU_ArchitectureType<CPU_ARCHTYPE_486NEWSLOW) goto illegalopcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486NEW) goto illegalopcode;
FillFlags();
if (inst_op1_d==reg_eax) {
inst_op1_d=reg_32(inst.rm_index);
Expand Down
40 changes: 17 additions & 23 deletions dosbox/src/cpu/core_normal/prefix_0f.h
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Expand Up @@ -144,7 +144,7 @@
break;
CASE_0F_B(0x08) /* INVD */
CASE_0F_B(0x09) /* WBINVD */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
if (cpu.pmode && cpu.cpl) EXCEPTION(EXCEPTION_GP);
break;
CASE_0F_B(0x20) /* MOV Rd.CRx */
Expand All @@ -156,9 +156,7 @@
LOG(LOG_CPU,LOG_ERROR)("MOV XXX,CR%u with non-register",which);
}
GetEArd;
Bit32u crx_value;
if (CPU_READ_CRX(which,crx_value)) RUNEXCEPTION();
*eard=crx_value;
if (CPU_READ_CRX(which,*eard)) RUNEXCEPTION();
}
break;
CASE_0F_B(0x21) /* MOV Rd,DRx */
Expand All @@ -170,9 +168,7 @@
LOG(LOG_CPU,LOG_ERROR)("MOV XXX,DR%u with non-register",which);
}
GetEArd;
Bit32u drx_value;
if (CPU_READ_DRX(which,drx_value)) RUNEXCEPTION();
*eard=drx_value;
if (CPU_READ_DRX(which,*eard)) RUNEXCEPTION();
}
break;
CASE_0F_B(0x22) /* MOV CRx,Rd */
Expand Down Expand Up @@ -208,9 +204,7 @@
LOG(LOG_CPU,LOG_ERROR)("MOV XXX,TR%u with non-register",which);
}
GetEArd;
Bit32u trx_value;
if (CPU_READ_TRX(which,trx_value)) RUNEXCEPTION();
*eard=trx_value;
if (CPU_READ_TRX(which,*eard)) RUNEXCEPTION();
}
break;
CASE_0F_B(0x26) /* MOV TRx,Rd */
Expand All @@ -227,7 +221,7 @@
break;
CASE_0F_B(0x31) /* RDTSC */
{
if (CPU_ArchitectureType<CPU_ARCHTYPE_PENTIUMSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_PENTIUM) goto illegal_opcode;
/* Use a fixed number when in auto cycles mode as else the reported value changes constantly */
Bit64s tsc=(Bit64s)(PIC_FullIndex()*(double) (CPU_CycleAutoAdjust?70000:CPU_CycleMax));
reg_edx=(Bit32u)(tsc>>32);
Expand Down Expand Up @@ -361,7 +355,7 @@
break;
CASE_0F_B(0xb0) /* cmpxchg Eb,Gb */
{
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
FillFlags();
GetRMrb;
if (rm >= 0xc0 ) {
Expand Down Expand Up @@ -389,7 +383,7 @@
}
CASE_0F_W(0xb1) /* cmpxchg Ew,Gw */
{
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
FillFlags();
GetRMrw;
if (rm >= 0xc0 ) {
Expand Down Expand Up @@ -579,42 +573,42 @@
}
CASE_0F_B(0xc0) /* XADD Gb,Eb */
{
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
GetRMrb;Bit8u oldrmrb=*rmrb;
if (rm >= 0xc0 ) {GetEArb;*rmrb=*earb;*earb+=oldrmrb;}
else {GetEAa;*rmrb=LoadMb(eaa);SaveMb(eaa,LoadMb(eaa)+oldrmrb);}
break;
}
CASE_0F_W(0xc1) /* XADD Gw,Ew */
{
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
GetRMrw;Bit16u oldrmrw=*rmrw;
if (rm >= 0xc0 ) {GetEArw;*rmrw=*earw;*earw+=oldrmrw;}
else {GetEAa;*rmrw=LoadMw(eaa);SaveMw(eaa,LoadMw(eaa)+oldrmrw);}
break;
}
CASE_0F_W(0xc8) /* BSWAP AX */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPW(reg_ax);break;
CASE_0F_W(0xc9) /* BSWAP CX */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPW(reg_cx);break;
CASE_0F_W(0xca) /* BSWAP DX */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPW(reg_dx);break;
CASE_0F_W(0xcb) /* BSWAP BX */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPW(reg_bx);break;
CASE_0F_W(0xcc) /* BSWAP SP */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPW(reg_sp);break;
CASE_0F_W(0xcd) /* BSWAP BP */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPW(reg_bp);break;
CASE_0F_W(0xce) /* BSWAP SI */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPW(reg_si);break;
CASE_0F_W(0xcf) /* BSWAP DI */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPW(reg_di);break;

32 changes: 30 additions & 2 deletions dosbox/src/cpu/core_normal/prefix_66.h
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Expand Up @@ -149,8 +149,36 @@
CASE_D(0x60) /* PUSHAD */
{
Bitu tmpesp = reg_esp;
Push_32(reg_eax);Push_32(reg_ecx);Push_32(reg_edx);Push_32(reg_ebx);
Push_32(tmpesp);Push_32(reg_ebp);Push_32(reg_esi);Push_32(reg_edi);
Bitu tmp=reg_esp;
Bitu tmp2=(tmp&cpu.stack.notmask)|((tmp-4)&cpu.stack.mask);
mem_writed(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_eax);
tmp=tmp2;
tmp2=(tmp&cpu.stack.notmask)|((tmp-4)&cpu.stack.mask);
mem_writed(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_ecx);
tmp=tmp2;
tmp2=(tmp&cpu.stack.notmask)|((tmp-4)&cpu.stack.mask);
mem_writed(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_edx);
tmp=tmp2;
tmp2=(tmp&cpu.stack.notmask)|((tmp-4)&cpu.stack.mask);
mem_writed(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_ebx);
tmp=tmp2;
tmp2=(tmp&cpu.stack.notmask)|((tmp-4)&cpu.stack.mask);
mem_writed(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,tmpesp);
tmp=tmp2;
tmp2=(tmp&cpu.stack.notmask)|((tmp-4)&cpu.stack.mask);
mem_writed(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_ebp);
tmp=tmp2;
tmp2=(tmp&cpu.stack.notmask)|((tmp-4)&cpu.stack.mask);
mem_writed(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_esi);
tmp=tmp2;
tmp2=(tmp&cpu.stack.notmask)|((tmp-4)&cpu.stack.mask);
mem_writed(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_edi);
tmp=tmp2;
reg_esp=tmp;

//Bitu tmpesp = reg_esp;
//Push_32(reg_eax);Push_32(reg_ecx);Push_32(reg_edx);Push_32(reg_ebx);
//Push_32(tmpesp);Push_32(reg_ebp);Push_32(reg_esi);Push_32(reg_edi);
}; break;
CASE_D(0x61) /* POPAD */
reg_edi=Pop_32();reg_esi=Pop_32();reg_ebp=Pop_32();Pop_32();//Don't save ESP
Expand Down
20 changes: 10 additions & 10 deletions dosbox/src/cpu/core_normal/prefix_66_0f.h
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Expand Up @@ -239,7 +239,7 @@
}
CASE_0F_D(0xb1) /* CMPXCHG Ed,Gd */
{
if (CPU_ArchitectureType<CPU_ARCHTYPE_486NEWSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486NEW) goto illegal_opcode;
FillFlags();
GetRMrd;
if (rm >= 0xc0) {
Expand Down Expand Up @@ -437,33 +437,33 @@
}
CASE_0F_D(0xc1) /* XADD Gd,Ed */
{
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
GetRMrd;Bit32u oldrmrd=*rmrd;
if (rm >= 0xc0 ) {GetEArd;*rmrd=*eard;*eard+=oldrmrd;}
else {GetEAa;*rmrd=LoadMd(eaa);SaveMd(eaa,LoadMd(eaa)+oldrmrd);}
break;
}
CASE_0F_D(0xc8) /* BSWAP EAX */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPD(reg_eax);break;
CASE_0F_D(0xc9) /* BSWAP ECX */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPD(reg_ecx);break;
CASE_0F_D(0xca) /* BSWAP EDX */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPD(reg_edx);break;
CASE_0F_D(0xcb) /* BSWAP EBX */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPD(reg_ebx);break;
CASE_0F_D(0xcc) /* BSWAP ESP */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPD(reg_esp);break;
CASE_0F_D(0xcd) /* BSWAP EBP */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPD(reg_ebp);break;
CASE_0F_D(0xce) /* BSWAP ESI */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPD(reg_esi);break;
CASE_0F_D(0xcf) /* BSWAP EDI */
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLD) goto illegal_opcode;
BSWAPD(reg_edi);break;
48 changes: 42 additions & 6 deletions dosbox/src/cpu/core_normal/prefix_none.h
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Expand Up @@ -217,8 +217,40 @@
CASE_W(0x60) /* PUSHA */
{
Bit16u old_sp=reg_sp;
Push_16(reg_ax);Push_16(reg_cx);Push_16(reg_dx);Push_16(reg_bx);
Push_16(old_sp);Push_16(reg_bp);Push_16(reg_si);Push_16(reg_di);
Bit32u tmp=reg_esp;
//Push_16(reg_ax);
Bitu tmp2=(tmp&cpu.stack.notmask)|((tmp-2)&cpu.stack.mask);
mem_writew(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_ax);
tmp=tmp2;
//Push_16(reg_cx);
tmp2=(tmp&cpu.stack.notmask)|((tmp-2)&cpu.stack.mask);
mem_writew(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_cx);
tmp=tmp2;
//Push_16(reg_dx);
tmp2=(tmp&cpu.stack.notmask)|((tmp-2)&cpu.stack.mask);
mem_writew(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_dx);
tmp=tmp2;
//Push_16(reg_bx);
tmp2=(tmp&cpu.stack.notmask)|((tmp-2)&cpu.stack.mask);
mem_writew(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_bx);
tmp=tmp2;
//Push_16(old_sp);
tmp2=(tmp&cpu.stack.notmask)|((tmp-2)&cpu.stack.mask);
mem_writew(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,old_sp);
tmp=tmp2;
//Push_16(reg_bp);
tmp2=(tmp&cpu.stack.notmask)|((tmp-2)&cpu.stack.mask);
mem_writew(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_bp);
tmp=tmp2;
//Push_16(reg_si);
tmp2=(tmp&cpu.stack.notmask)|((tmp-2)&cpu.stack.mask);
mem_writew(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_si);
tmp=tmp2;
//Push_16(reg_di);
tmp2=(tmp&cpu.stack.notmask)|((tmp-2)&cpu.stack.mask);
mem_writew(SegPhys(ss) + (tmp2 & cpu.stack.mask) ,reg_di);
tmp=tmp2;
reg_sp=tmp;
}
break;
CASE_W(0x61) /* POPA */
Expand Down Expand Up @@ -692,17 +724,21 @@
GetRMrw;
if (rm >= 0xc0) goto illegal_opcode;
GetEAa;
if (CPU_SetSegGeneral(es,LoadMw(eaa+2))) RUNEXCEPTION();
*rmrw=LoadMw(eaa);
Bitu j=LoadMw(eaa+2);
Bitu k=LoadMw(eaa);
if (CPU_SetSegGeneral(es,j)) RUNEXCEPTION();
*rmrw=k;
break;
}
CASE_W(0xc5) /* LDS */
{
GetRMrw;
if (rm >= 0xc0) goto illegal_opcode;
GetEAa;
if (CPU_SetSegGeneral(ds,LoadMw(eaa+2))) RUNEXCEPTION();
*rmrw=LoadMw(eaa);
Bitu j=LoadMw(eaa+2);
Bitu k=LoadMw(eaa);
if (CPU_SetSegGeneral(ds,j)) RUNEXCEPTION();
*rmrw=k;
break;
}
CASE_B(0xc6) /* MOV Eb,Ib */
Expand Down
6 changes: 4 additions & 2 deletions dosbox/src/cpu/core_normal/support.h
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Expand Up @@ -75,9 +75,11 @@ static INLINE Bit32s Fetchds() {
}

#define JumpCond32_d(COND) { \
Bit32s i; \
if (COND) i = Fetchds(); \
SAVEIP; \
if (COND) reg_eip+=Fetchds(); \
reg_eip+=4; \
if (COND) reg_eip+=i; \
else reg_eip+=4; \
continue; \
}

Expand Down
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