New execute/terminate that saves registers and segments.
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@272
This commit is contained in:
Sjoerd van der Berg
parent
16f6308ef7
commit
af67029cdc
1 changed files with 163 additions and 239 deletions
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@ -21,12 +21,10 @@
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#include "mem.h"
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#include "dos_inc.h"
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#include "cpu.h"
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#if defined (_MSC_VER)
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#pragma pack(1)
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#endif
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#include "callback.h"
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#pragma pack(1)
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struct EXE_Header {
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Bit16u signature; /* EXE Signature MZ or ZM */
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Bit16u extrabytes; /* Bytes on the last page */
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Bit16u pages; /* Pages in file */
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@ -41,13 +39,8 @@ struct EXE_Header {
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Bit16u initCS;
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Bit16u reloctable;
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Bit16u overlay;
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}
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#if defined (_MSC_VER)
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;
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} GCC_ATTRIBUTE(packed);
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#pragma pack()
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#else
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__attribute__ ((packed));
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#endif
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#define MAGIC1 0x5a4d
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#define MAGIC2 0x4d5a
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@ -63,31 +56,64 @@ __attribute__ ((packed));
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#define OVERLAY 3
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static void SaveRegisters(void) {
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reg_sp-=20;
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mem_writew(SegPhys(ss)+reg_sp+ 0,reg_ax);
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mem_writew(SegPhys(ss)+reg_sp+ 2,reg_cx);
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mem_writew(SegPhys(ss)+reg_sp+ 4,reg_dx);
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mem_writew(SegPhys(ss)+reg_sp+ 6,reg_bx);
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mem_writew(SegPhys(ss)+reg_sp+ 8,reg_si);
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mem_writew(SegPhys(ss)+reg_sp+10,reg_di);
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mem_writew(SegPhys(ss)+reg_sp+12,reg_bp);
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mem_writew(SegPhys(ss)+reg_sp+14,SegValue(ds));
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mem_writew(SegPhys(ss)+reg_sp+16,SegValue(es));
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}
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static void RestoreRegisters(void) {
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reg_ax=mem_readw(SegPhys(ss)+reg_sp+ 0);
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reg_cx=mem_readw(SegPhys(ss)+reg_sp+ 2);
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reg_dx=mem_readw(SegPhys(ss)+reg_sp+ 4);
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reg_bx=mem_readw(SegPhys(ss)+reg_sp+ 6);
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reg_si=mem_readw(SegPhys(ss)+reg_sp+ 8);
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reg_di=mem_readw(SegPhys(ss)+reg_sp+10);
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reg_bp=mem_readw(SegPhys(ss)+reg_sp+12);
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SegSet16(ds,mem_readw(SegPhys(ss)+reg_sp+14));
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SegSet16(es,mem_readw(SegPhys(ss)+reg_sp+16));
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reg_sp+=20;
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}
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bool DOS_Terminate(bool tsr) {
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dos.return_code=reg_al;
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dos.return_mode=RETURN_EXIT;
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Bit16u mempsp = dos.psp;
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DOS_PSP curpsp(dos.psp);
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if (dos.psp==curpsp.GetParent()) return true;
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/* Free Files owned by process */
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if (!tsr) curpsp.CloseFiles();
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// restore vectors
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/* Get the termination address */
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RealPt old22 = RealGetVec(0x22);
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/* Restore vector 22,23,24 */
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curpsp.RestoreVectors();
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// Set parent psp
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/* Set the parent PSP */
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dos.psp = curpsp.GetParent();
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DOS_PSP parentpsp(curpsp.GetParent());
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/* Restore the DTA */
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parentpsp.SetDTA(curpsp.GetDTA());
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/* Restore the DTA of the parent psp */
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dos.dta = parentpsp.GetDTA();
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/* Restore the SS:SP to the previous one */
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SegSet16(ss,RealSeg(parentpsp.GetStack()));
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reg_sp = RealOff(parentpsp.GetStack());
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/* Restore the old CS:IP from int 22h */
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RealPt old22 = curpsp.GetInt22();
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reg_ip = RealOff(old22);
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SegSet16 (cs,RealSeg(old22));
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/* Restore the stored registers */
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RestoreRegisters();
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/* Set the CS:IP stored in int 0x22 back on the stack */
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mem_writew(SegPhys(ss)+reg_sp+0,RealOff(old22));
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mem_writew(SegPhys(ss)+reg_sp+2,RealSeg(old22));
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// Free memory owned by process
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if (!tsr) DOS_FreeProcessMemory(mempsp);
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return true;
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}
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@ -109,7 +135,6 @@ static bool MakeEnv(char * name,Bit16u * segment) {
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envread=HostMake(*segment,0);
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}
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//TODO Make a good DOS first psp
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if (parentenv) {
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for (envsize=0; ;envsize++) {
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if (envsize>=MAXENV - ENV_KEEPFREE) {
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@ -131,7 +156,7 @@ static bool MakeEnv(char * name,Bit16u * segment) {
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}
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*((Bit16u *) envwrite)=1;
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envwrite+=2;
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//TODO put the filename here
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return DOS_Canonicalize(name,(char *)envwrite);
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};
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@ -145,14 +170,14 @@ bool DOS_NewPSP(Bit16u segment, Bit16u size)
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static void SetupPSP(Bit16u pspseg,Bit16u memsize,Bit16u envseg) {
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/* Fix the PSP index of this MCB */
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/* Fix the PSP for psp and environment MCB's */
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MCB * pspmcb=(MCB *)HostMake(pspseg-1,0);
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pspmcb->psp_segment=pspseg;
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MCB * envmcb=(MCB *)HostMake(envseg-1,0);
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envmcb->psp_segment=pspseg;
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DOS_PSP psp(pspseg);
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psp.MakeNew(memsize+pspseg);
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psp.MakeNew(memsize);
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psp.SetEnvironment(envseg);
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psp.SetFileHandle(STDIN ,DOS_FindDevice("CON"));
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psp.SetFileHandle(STDOUT,DOS_FindDevice("CON"));
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@ -173,233 +198,132 @@ static void SetupCMDLine(Bit16u pspseg,ParamBlock * block)
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psp.SetCommandTail(block->exec.cmdtail);
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}
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static bool COM_Load(char * name,ParamBlock * block,Bit8u flag) {
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Bit16u fhandle;
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Bit16u size;Bit16u readsize;
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Bit16u envseg,comseg;
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Bit32u pos;
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DOS_PSP callpsp(dos.psp);
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if (!DOS_OpenFile(name,OPEN_READ,&fhandle)) return false;
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if (flag!=OVERLAY) {
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/* Allocate a new Environment */
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envseg=block->exec.envseg;
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if (!MakeEnv(name,&envseg)) return false;
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/* Allocate max memory for COM file and PSP */
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size=0xffff;
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DOS_AllocateMemory(&comseg,&size);
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//TODO Errors check for minimun of 64kb in pages
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if (Bit32u(size <<4)<0x1000) {
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DOS_SetError(DOSERR_INSUFFICIENT_MEMORY);
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DOS_FreeMemory(envseg);
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return false;
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}
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DOS_AllocateMemory(&comseg,&size);
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} else {
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comseg=block->overlay.loadseg;
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}
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/* Memory allocated now load the program */
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/* Now copy the File into allocated memory */
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pos=0;
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DOS_SeekFile(fhandle,&pos,0);
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readsize=0xffff-256;
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if (flag==OVERLAY) {
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DOS_ReadFile(fhandle,HostMake(comseg,0),&readsize);
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} else {
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DOS_ReadFile(fhandle,HostMake(comseg,256),&readsize);
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}
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DOS_CloseFile(fhandle);
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if (flag==OVERLAY) /* Everything what should be done for Overlays */
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return true;
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SetupPSP(comseg,size,envseg);
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SetupCMDLine(comseg,block);
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/* Setup termination Address */
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RealSetVec(0x22,RealMakeSeg(cs,reg_ip));
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DOS_PSP compsp(comseg);
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compsp.SetInt22(RealMakeSeg(cs,reg_ip));
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/* Everything setup somewhat setup CS:IP and SS:SP */
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/* First save the SS:SP of program that called execute */
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callpsp.SetStack(RealMakeSeg(ss,reg_sp));
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/* Clear out first Stack entry to point to int 20h at psp:0 */
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real_writew(comseg,0xfffe,0);
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dos.psp=comseg;
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switch (flag) {
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case LOADNGO:
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/* copy fcbs */
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compsp.SetFCB1(block->exec.fcb1);
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compsp.SetFCB2(block->exec.fcb2);
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/* setup reg */
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SegSet16(cs,comseg);
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SegSet16(ss,comseg);
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SegSet16(ds,comseg);
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SegSet16(es,comseg);
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flags.intf=true;
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reg_ip=0x100;
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reg_sp=0xFFFE;
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reg_ax=0;
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reg_bx=reg_cx=reg_dx=reg_si=reg_di=reg_bp=0;
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return true;
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case LOAD:
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block->exec.initsssp=RealMake(comseg,0xfffe);
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block->exec.initcsip=RealMake(comseg,0x100);
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return true;
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}
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return false;
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}
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static bool EXE_Load(char * name,ParamBlock* _block,Bit8u flag) {
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EXE_Header header;
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Bit16u fhandle;Bit32u i;
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Bit16u size,minsize,maxsize,freesize;Bit16u readsize;
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Bit16u envseg,pspseg,exeseg;
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Bit32u imagesize,headersize;
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// During loading process, th param-block-mem might be overwritten (HostPt!) and
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// therefore change the relocation address, so save these values.
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ParamBlock block;
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memcpy(&block,_block,sizeof(ParamBlock));
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DOS_PSP callpsp(dos.psp);
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if (!DOS_OpenFile(name,OPEN_READ,&fhandle)) return false;
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if (flag!=OVERLAY) {
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/* Allocate a new Environment */
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envseg=block.exec.envseg;
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if (!MakeEnv(name,&envseg)) return false;
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};
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/* First Read the EXE Header */
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readsize=sizeof(EXE_Header);
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DOS_ReadFile(fhandle,(Bit8u*)&header,&readsize);
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/* Calculate the size of the image to load */
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headersize=header.headersize*16;
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imagesize=header.pages*512-headersize;
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if (flag!=OVERLAY) {
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minsize=long2para(imagesize+(header.minmemory<<4)+256);
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if (header.maxmemory!=0) maxsize=long2para(imagesize+(header.maxmemory<<4)+256);
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else maxsize=0xffff;
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freesize=0xffff;
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/* Check for enough free memory */
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DOS_AllocateMemory(&exeseg,&freesize);
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if (minsize>freesize) {
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DOS_SetError(DOSERR_INSUFFICIENT_MEMORY);
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DOS_FreeMemory(envseg);
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return false;
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}
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if (maxsize>freesize) {
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size=freesize;
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} else size=maxsize;
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if ((header.minmemory|header.maxmemory)==0) {
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size=freesize;
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E_Exit("Special case exe header max and min=0");
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}
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if (!DOS_AllocateMemory(&pspseg,&size)) {
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DOS_SetError(DOSERR_INSUFFICIENT_MEMORY);
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DOS_FreeMemory(envseg);
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return false;
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}
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SetupPSP(pspseg,size,envseg);
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SetupCMDLine(pspseg,&block);
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exeseg=pspseg+16;
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} else {
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/* For OVERLAY */
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exeseg=block.overlay.loadseg;
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}
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/* Load the image in 32k blocks */
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DOS_SeekFile(fhandle,&headersize,0);
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Bit8u * imageoff=HostMake(exeseg,0);
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//TODO File size checking and remove size
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// Remove psp size
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// imagesize=256;
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// Maybe remove final page and add last bytes on page
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if (header.extrabytes) {
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imagesize-=512;
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imagesize+=header.extrabytes;
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};
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while (imagesize>0x7FFF) {
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readsize=0x8000;
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DOS_ReadFile(fhandle,imageoff,&readsize);
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if (readsize!=0x8000) {
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E_Exit("Illegal header");
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}
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imageoff+=0x8000;
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imagesize-=0x8000;
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}
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if (imagesize>0) {
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readsize=(Bit16u) imagesize;
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DOS_ReadFile(fhandle,imageoff,&readsize);
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}
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headersize=header.reloctable;
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DOS_SeekFile(fhandle,&headersize,0);
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RealPt reloc;
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for (i=0;i<header.relocations;i++) {
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readsize=4;
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DOS_ReadFile(fhandle,(Bit8u *)&reloc,&readsize);
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PhysPt address=Real2Phys(RealMake(RealSeg(reloc)+exeseg,RealOff(reloc)));
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Bit16u change=mem_readw(address);
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if (flag==OVERLAY) {
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change+=block.overlay.relocation;
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} else {
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change+=exeseg;
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};
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mem_writew(address,change);
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};
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DOS_CloseFile(fhandle);
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if (flag==OVERLAY) return true;
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/* Setup termination Address */
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RealSetVec(0x22,RealMakeSeg(cs,reg_ip));
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DOS_PSP exepsp(pspseg);
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exepsp.SetInt22(RealMakeSeg(cs,reg_ip));
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/* Start up the actual EXE if we need to */
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//TODO check for load and return
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callpsp.SetStack(RealMakeSeg(ss,reg_sp));
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dos.psp=pspseg;
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SegSet16(cs,exeseg+header.initCS);
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SegSet16(ss,exeseg+header.initSS);
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SegSet16(ds,pspseg);
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SegSet16(es,pspseg);
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reg_ip=header.initIP;
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reg_sp=header.initSP;
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reg_ax=0;
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reg_bx=reg_cx=reg_dx=reg_si=reg_di=reg_bp=0;
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flags.intf=true;
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return true;
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};
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bool DOS_Execute(char * name,ParamBlock * block,Bit8u flags) {
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EXE_Header head;
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Bit16u fhandle;
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Bit16u size;
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EXE_Header head;Bitu i;
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Bit16u fhandle;Bit16u len;Bit32u pos;
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Bit16u pspseg,envseg,loadseg,memsize,readsize;
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HostPt loadaddress;RealPt relocpt;
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Bitu headersize,imagesize;
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if (flags!=LOADNGO && flags!=OVERLAY) {
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E_Exit("DOS:Not supported execute mode %d for file %s",flags,name);
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}
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/* Check for EXE or COM File */
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bool iscom=false;
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if (!DOS_OpenFile(name,OPEN_READ,&fhandle)) return false;
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size=sizeof(EXE_Header);
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if (!DOS_ReadFile(fhandle,(Bit8u *)&head,&size)) {
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len=sizeof(EXE_Header);
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if (!DOS_ReadFile(fhandle,(Bit8u *)&head,&len)) {
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DOS_CloseFile(fhandle);
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return false;
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}
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if (!DOS_CloseFile(fhandle)) return false;
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if (size<sizeof(EXE_Header)) iscom=true;
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if (len<sizeof(EXE_Header)) iscom=true;
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if ((head.signature!=MAGIC1) && (head.signature!=MAGIC2)) iscom=true;
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if (iscom) {
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return COM_Load(name,block,flags);
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} else {
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return EXE_Load(name,block,flags);
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else {
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headersize=head.headersize*16;
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imagesize=(head.pages-1)*512-headersize+head.extrabytes;
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}
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if (flags!=OVERLAY) {
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/* Create an environment block */
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envseg=block->exec.envseg;
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if (!MakeEnv(name,&envseg)) {
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DOS_CloseFile(fhandle);
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return false;
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}
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/* Get Memory */
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Bit16u minsize,maxsize;Bit16u maxfree=0xffff;DOS_AllocateMemory(&pspseg,&maxfree);
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if (iscom) {
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minsize=0x1000;maxsize=0xffff;
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} else { /* Exe size calculated from header */
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minsize=long2para(imagesize+(head.minmemory<<4)+256);
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if (head.maxmemory!=0) maxsize=long2para(imagesize+(head.maxmemory<<4)+256);
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else maxsize=0xffff;
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}
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if (maxfree<minsize) {
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DOS_SetError(DOSERR_INSUFFICIENT_MEMORY);
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DOS_FreeMemory(envseg);
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return false;
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}
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if (maxfree<maxsize) memsize=maxfree;
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else memsize=maxsize;
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if (!DOS_AllocateMemory(&pspseg,&memsize)) E_Exit("DOS:Exec error in memory");
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loadseg=pspseg+16;
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/* Setup a psp */
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SetupPSP(pspseg,memsize,envseg);
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SetupCMDLine(pspseg,block);
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} else loadseg=block->overlay.loadseg,0;
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/* Load the executable */
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loadaddress=HostMake(loadseg,0);
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if (iscom) { /* COM Load 64k - 256 bytes max */
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pos=0;DOS_SeekFile(fhandle,&pos,DOS_SEEK_SET);
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readsize=0xffff-256;
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DOS_ReadFile(fhandle,loadaddress,&readsize);
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} else { /* EXE Load in 32kb blocks and then relocate */
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pos=headersize;DOS_SeekFile(fhandle,&pos,DOS_SEEK_SET);
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while (imagesize>0x7FFF) {
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readsize=0x8000;DOS_ReadFile(fhandle,loadaddress,&readsize);
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if (readsize!=0x8000) E_Exit("Illegal header");
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loadaddress+=0x8000;imagesize-=0x8000;
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}
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if (imagesize>0) {
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readsize=(Bit16u)imagesize;DOS_ReadFile(fhandle,loadaddress,&readsize);
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if (readsize!=imagesize) E_Exit("Illegal header");
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}
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/* Relocate the exe image */
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Bit16u relocate;
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if (flags==OVERLAY) relocate=block->overlay.relocation;
|
||||
else relocate=loadseg;
|
||||
pos=head.reloctable;DOS_SeekFile(fhandle,&pos,0);
|
||||
for (i=0;i<head.relocations;i++) {
|
||||
readsize=4;DOS_ReadFile(fhandle,(Bit8u *)&relocpt,&readsize);
|
||||
relocpt=readd((Bit8u *)&relocpt); //Endianize
|
||||
PhysPt address=PhysMake(RealSeg(relocpt)+loadseg,RealOff(relocpt));
|
||||
mem_writew(address,mem_readw(address)+relocate);
|
||||
}
|
||||
}
|
||||
DOS_CloseFile(fhandle);
|
||||
CALLBACK_SCF(false); /* Carry flag cleared for caller if successfull */
|
||||
if (flags==OVERLAY) return true; /* Everything done for overlays */
|
||||
RealPt csip,sssp;
|
||||
if (iscom) {
|
||||
csip=RealMake(pspseg,0x100);
|
||||
sssp=RealMake(pspseg,0xfffe);
|
||||
mem_writew(PhysMake(pspseg,0xfffe),0);
|
||||
} else {
|
||||
csip=RealMake(loadseg+head.initCS,head.initIP);
|
||||
sssp=RealMake(loadseg+head.initSS,head.initSP);
|
||||
}
|
||||
if (flags==LOADNGO) {
|
||||
/* Get Caller's program CS:IP of the stack and set termination address to that */
|
||||
RealSetVec(0x22,RealMake(mem_readw(SegPhys(ss)+reg_sp+2),mem_readw(SegPhys(ss)+reg_sp)));
|
||||
SaveRegisters();
|
||||
DOS_PSP callpsp(dos.psp);
|
||||
/* Save the SS:SP on the PSP of calling program */
|
||||
callpsp.SetStack(RealMakeSeg(ss,reg_sp));
|
||||
/* Switch the psp's and set new DTA */
|
||||
dos.psp=pspseg;
|
||||
DOS_PSP newpsp(dos.psp);
|
||||
dos.dta=newpsp.GetDTA();
|
||||
/* copy fcbs */
|
||||
newpsp.SetFCB1(block->exec.fcb1);
|
||||
newpsp.SetFCB2(block->exec.fcb2);
|
||||
/* Set the stack for new program */
|
||||
SegSet16(ss,RealSeg(sssp));reg_sp=RealOff(sssp);
|
||||
/* Add some flags and CS:IP on the stack for the IRET */
|
||||
reg_sp-=6;
|
||||
mem_writew(SegPhys(ss)+reg_sp+0,RealOff(csip));
|
||||
mem_writew(SegPhys(ss)+reg_sp+2,RealSeg(csip));
|
||||
mem_writew(SegPhys(ss)+reg_sp+4,0x200);
|
||||
/* Setup the rest of the registers */
|
||||
reg_ax=0;
|
||||
reg_cx=reg_dx=reg_bx=reg_si=reg_di=reg_bp=0;
|
||||
SegSet16(ds,pspseg);SegSet16(es,pspseg);
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue