Re: experimental LFN support for redirected drives

[Stas Sergeev <stsp@aknet.ru>]

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Hello.

Bart Oldeman wrote:
> INT 21 now just executes the DOS int21 and never reaches
> the DOSEMU revectored int21 code. I don't know if it's
> safe to transfer to f000:_BL*0x10 for every interrupt.
I am thinking about a less intrusive solution.

> Maybe you do?
OK, I will do (trying right now:)
The attached patch is intended to fix the
problem. I don't have your test-case for it
so I can only guess if it helps or works as
expected.
A quick test against a couple of DPMI progs
shows no regressions.
Does this help?

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--- src/base/async/int.c	Sun Jun 15 03:01:24 2003
+++ src/base/async/int.c	Mon Jul 14 21:14:22 2003
@@ -1941,6 +1941,13 @@
   LWORD(esp) -= 4;
 }
 
+void fake_call_to(int cs, int ip)
+{
+  fake_call(REG(cs), LWORD(eip));
+  REG(cs) = cs;
+  REG(eip) = ip;
+}
+
 void fake_pusha(void)
 {
 #ifdef X86_EMULATOR
--- src/dosext/dpmi/dpmi.c	Sun Jun 15 19:43:23 2003
+++ src/dosext/dpmi/dpmi.c	Mon Jul 14 21:15:13 2003
@@ -1581,15 +1581,6 @@
       REG(ds) = rmreg->ds;
       REG(fs) = rmreg->fs;
       REG(gs) = rmreg->gs;
-      if (_LWORD(eax)==0x0300) {
-        if (_LO(bx)==0x21)
-          D_printf("DPMI: int 0x21 fn %04x\n",LWORD(eax));
-	REG(cs) = ((us *) 0)[(_LO(bx) << 1) + 1];
-	REG(eip) = ((us *) 0)[_LO(bx) << 1];
-      } else {
-	REG(cs) = rmreg->cs;
-	REG(eip) = (long) rmreg->ip;
-      }
       if (!(rmreg->sp==0)) {
 	REG(ss) = rmreg->ss;
 	REG(esp) = (long) rmreg->sp;
@@ -1606,36 +1597,29 @@
       if (tmp) E_MPROT_STACK(tmp_ssp);
 #endif
       LWORD(esp) -= 2 * (_LWORD(ecx));
-      if (_LWORD(eax)==0x0301)
-	       LWORD(esp) -= 4;
-      else {
-	LWORD(esp) -= 6;
-#ifdef X86_EMULATOR
-	tmp_ssp = rm_ssp+rm_sp;
-	tmp = E_MUNPROT_STACK(tmp_ssp);
-#endif
-	pushw(rm_ssp, rm_sp, LWORD(eflags));
-#ifdef X86_EMULATOR
-	if (tmp) E_MPROT_STACK(tmp_ssp);
-#endif
-	REG(eflags) &= ~(IF|TF);
+      in_dpmi_dos_int=1;
+      REG(cs) = DPMI_SEG;
+      LWORD(eip) = DPMI_OFF + HLT_OFF(DPMI_return_from_realmode);
+      switch (_LWORD(eax)) {
+        case 0x0300:
+          if (_LO(bx)==0x21)
+            D_printf("DPMI: int 0x21 fn %04x\n",LWORD(eax));
+	  do_int(_LO(bx));
+	  break;
+        case 0x0301:
+	  fake_call_to(rmreg->cs, rmreg->ip);
+	  break;
+        case 0x0302:
+	  fake_int_to(rmreg->cs, rmreg->ip);
+	  break;
       }
+
 /* --------------------------------------------------- 0x300:
      RM |  FC90C   |
 	| dpmi_seg |
 	|  flags   |
 	| cx words |
    --------------------------------------------------- */
-#ifdef X86_EMULATOR
-      tmp_ssp = rm_ssp+rm_sp;
-      tmp = E_MUNPROT_STACK(tmp_ssp);
-#endif
-      pushw(rm_ssp, rm_sp, DPMI_SEG);
-      pushw(rm_ssp, rm_sp, DPMI_OFF + HLT_OFF(DPMI_return_from_realmode));
-#ifdef X86_EMULATOR
-      if (tmp) E_MPROT_STACK(tmp_ssp);
-#endif
-      in_dpmi_dos_int=1;
     }
 #ifdef SHOWREGS
     if (debug_level('e')==0) {
--- src/include/int.h	Mon Jul 14 21:15:01 2003
+++ src/include/int.h	Mon Jul 14 21:15:09 2003
@@ -20,6 +20,7 @@
 void fake_int(int, int);
 void fake_int_to(int cs, int ip);
 void fake_call(int, int);
+void fake_call_to(int cs, int ip);
 void fake_pusha(void);
 void setup_interrupts(void);
 void version_init(void);