From c2e3fb5918287da5604d75f98227f994b910f4f4 Mon Sep 17 00:00:00 2001
From: nickysn <nickysn@gmail.com>
Date: Sat, 1 Jun 2013 15:50:11 +0000
Subject: [PATCH] + emit proper interrupt procedure entry/exit code on i8086

git-svn-id: trunk@24728 -
---
 compiler/cgbase.pas       |  3 +++
 compiler/i8086/cgcpu.pas  | 48 ++++++++-------------------------------
 compiler/x86/agx86nsm.pas |  6 +++++
 compiler/x86/cgx86.pas    | 21 +++++++++++++++++
 4 files changed, 40 insertions(+), 38 deletions(-)

diff --git a/compiler/cgbase.pas b/compiler/cgbase.pas
index 816e05a9c8..dcaf96c12e 100644
--- a/compiler/cgbase.pas
+++ b/compiler/cgbase.pas
@@ -97,6 +97,9 @@ interface
          ,addr_lo8
          ,addr_hi8
          {$ENDIF}
+         {$IFDEF i8086}
+         ,addr_dgroup      // the data segment group
+         {$ENDIF}
          );
 
 
diff --git a/compiler/i8086/cgcpu.pas b/compiler/i8086/cgcpu.pas
index f35f932728..1b398beaed 100644
--- a/compiler/i8086/cgcpu.pas
+++ b/compiler/i8086/cgcpu.pas
@@ -1244,45 +1244,17 @@ unit cgcpu;
             list.concat(tai_regalloc.dealloc(current_procinfo.framepointer,nil));
           end;
 
-        { return from proc }
-        if (po_interrupt in current_procinfo.procdef.procoptions) and
-           { this messes up stack alignment }
-           (target_info.stackalign=4) then
+        { return from interrupt }
+        if po_interrupt in current_procinfo.procdef.procoptions then
           begin
-            if assigned(current_procinfo.procdef.funcretloc[calleeside].location) and
-               (current_procinfo.procdef.funcretloc[calleeside].location^.loc=LOC_REGISTER) then
-              begin
-                if (getsupreg(current_procinfo.procdef.funcretloc[calleeside].location^.register)=RS_EAX) then
-                  list.concat(Taicpu.Op_const_reg(A_ADD,S_L,4,NR_ESP))
-                else
-                  internalerror(2010053001);
-              end
-            else
-              list.concat(Taicpu.Op_reg(A_POP,S_L,NR_EAX));
-            list.concat(Taicpu.Op_reg(A_POP,S_L,NR_EBX));
-            list.concat(Taicpu.Op_reg(A_POP,S_L,NR_ECX));
-
-            if (current_procinfo.procdef.funcretloc[calleeside].size in [OS_64,OS_S64]) and
-               assigned(current_procinfo.procdef.funcretloc[calleeside].location) and
-               assigned(current_procinfo.procdef.funcretloc[calleeside].location^.next) and
-               (current_procinfo.procdef.funcretloc[calleeside].location^.next^.loc=LOC_REGISTER) then
-              begin
-                if (getsupreg(current_procinfo.procdef.funcretloc[calleeside].location^.next^.register)=RS_EDX) then
-                  list.concat(Taicpu.Op_const_reg(A_ADD,S_L,4,NR_ESP))
-                else
-                  internalerror(2010053002);
-              end
-            else
-              list.concat(Taicpu.Op_reg(A_POP,S_L,NR_EDX));
-
-            list.concat(Taicpu.Op_reg(A_POP,S_L,NR_ESI));
-            list.concat(Taicpu.Op_reg(A_POP,S_L,NR_EDI));
-            { .... also the segment registers }
-            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_DS));
-            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_ES));
-            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_FS));
-            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_GS));
-            { this restores the flags }
+            list.concat(Taicpu.Op_reg(A_POP,S_L,NR_ES));
+            list.concat(Taicpu.Op_reg(A_POP,S_L,NR_DS));
+            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_DI));
+            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_SI));
+            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_DX));
+            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_CX));
+            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_BX));
+            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_AX));
             list.concat(Taicpu.Op_none(A_IRET,S_NO));
           end
         { Routines with the poclearstack flag set use only a ret }
diff --git a/compiler/x86/agx86nsm.pas b/compiler/x86/agx86nsm.pas
index f663865144..e70ca884de 100644
--- a/compiler/x86/agx86nsm.pas
+++ b/compiler/x86/agx86nsm.pas
@@ -367,6 +367,12 @@ interface
                     AsmWrite(sizestr(s,dest));
                   WriteReference(o.ref^);
                 end
+{$ifdef i8086}
+              else if o.ref^.refaddr=addr_dgroup then
+                begin
+                  AsmWrite('dgroup');
+                end
+{$endif i8086}
               else
                 begin
 {$ifdef x86_64}
diff --git a/compiler/x86/cgx86.pas b/compiler/x86/cgx86.pas
index 4571b2d0b7..3bb13dc526 100644
--- a/compiler/x86/cgx86.pas
+++ b/compiler/x86/cgx86.pas
@@ -2212,7 +2212,28 @@ unit cgx86;
       var
         stackmisalignment: longint;
         para: tparavarsym;
+{$ifdef i8086}
+        dgroup: treference;
+{$endif i8086}
       begin
+{$ifdef i8086}
+        { interrupt support for i8086 }
+        if po_interrupt in current_procinfo.procdef.procoptions then
+          begin
+            list.concat(Taicpu.Op_reg(A_PUSH,S_W,NR_AX));
+            list.concat(Taicpu.Op_reg(A_PUSH,S_W,NR_BX));
+            list.concat(Taicpu.Op_reg(A_PUSH,S_W,NR_CX));
+            list.concat(Taicpu.Op_reg(A_PUSH,S_W,NR_DX));
+            list.concat(Taicpu.Op_reg(A_PUSH,S_W,NR_SI));
+            list.concat(Taicpu.Op_reg(A_PUSH,S_W,NR_DI));
+            list.concat(Taicpu.Op_reg(A_PUSH,S_L,NR_DS));
+            list.concat(Taicpu.Op_reg(A_PUSH,S_L,NR_ES));
+            reference_reset(dgroup,0);
+            dgroup.refaddr:=addr_dgroup;
+            list.concat(Taicpu.Op_ref_reg(A_MOV,S_W,dgroup,NR_AX));
+            list.concat(Taicpu.Op_reg_reg(A_MOV,S_W,NR_AX,NR_DS));
+          end;
+{$endif i8086}
 {$ifdef i386}
         { interrupt support for i386 }
         if (po_interrupt in current_procinfo.procdef.procoptions) and