Provide fixed UserSpace function for Kickstart 1.x

cahirwpz · Dec 16, 2023 · 5020a97 · 5020a97
1 parent 284862c
commit 5020a97
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Showing 3 changed files with 21 additions and 2 deletions.
diff --git a/system/Makefile b/system/Makefile
@@ -8,6 +8,7 @@ SOURCES := \
 	autoinit.c \
 	debug.c \
 	dputchar.S \
+	kickfix.S \
 	kputchar.S \
 	effect.c \
 	loader.c \

diff --git a/system/amigaos.c b/system/amigaos.c
@@ -250,6 +250,8 @@ BootDataT *SaveOS(void) {
   return &BootData;
 }
 
+extern void UserState34(void *stack);
+
 void RestoreOS(void) {
   BootDataT *bd = &BootData;
 
@@ -266,8 +268,13 @@ void RestoreOS(void) {
 
   /* Restore exception vector and leave supervisor mode. */
   memcpy(bd->bd_vbr, old.excVec, sizeof(old.excVec));
-  /* TODO: This function is broken in V33/34 Kickstart, hangs on 68010. */
-  UserState(old.sysStack);
+
+  /* UserState is broken on V33/34 Kickstart, hangs on 68010. */
+  if (ExecVer <= 34) {
+    UserState34(old.sysStack);
+  } else {
+    UserState(old.sysStack);
+  }
 
   /* CIA-A & CIA-B: Restore state of all timers. */
   SetTimerState(&ciaa->ciacra, &ciaa->ciatalo, &ciaa->ciatahi, &old.timer[0]);

diff --git a/system/kickfix.S b/system/kickfix.S
@@ -0,0 +1,11 @@
+#include <asm.h>
+
+ENTRY(UserState34)
+        movea.l (sp)+,a1
+        move.l  sp,usp
+        movea.l a0,sp
+        and.w   #0xdfff,sr
+        jmp     (a1)
+END(UserState34)
+
+# vim: ft=gas:ts=8:sw=8:noet: