Backup and restore registers when calling out to user funcs.

Make sure to fully backup and restore register state when calling out
to other interrupts and functions.  Some old DOS programs don't fully
restore state.

Also, make sure to enable irqs in call16_simpint().

1 files changed, 6 insertions, 4 deletions

diff --git a/src/mouse.c b/src/mouse.c
index 8389d2a..aba12ad 100644
--- a/src/mouse.c
+++ b/src/mouse.c
@@ -305,15 +305,17 @@ process_mouse(u8 data)
         return;
     }
 
-    //BX_DEBUG_INT74("int74_function: make_farcall=1\n");
     u16 status = GET_EBDA2(ebda_seg, mouse_data[0]);
     u16 X      = GET_EBDA2(ebda_seg, mouse_data[1]);
     u16 Y      = GET_EBDA2(ebda_seg, mouse_data[2]);
     SET_EBDA2(ebda_seg, mouse_flag1, 0);
 
     struct segoff_s func = GET_EBDA2(ebda_seg, far_call_pointer);
+    dprintf(16, "mouse farcall s=%04x x=%04x y=%04x func=%04x:%04x\n"
+            , status, X, Y, func.seg, func.offset);
 
     asm volatile(
+        "pushl %%ebp\n"
         "sti\n"
 
         "pushl %0\n"
@@ -326,8 +328,8 @@ process_mouse(u8 data)
 
         "cli\n"
         "cld\n"
+        "popl %%ebp"
+        : "+a"(func.segoff), "+c"(status), "+d"(X), "+b"(Y)
         :
-        : "r"(func.segoff), "r"(status), "r"(X), "r"(Y)
-        : "cc"
-        );
+        : "edi", "esi", "cc", "memory");
 }