1 files changed, 71 insertions, 0 deletions
diff --git a/config/solaris/i386.c b/config/solaris/i386.c
new file mode 100644
index 0000000..fa88c93
--- /dev/null
+++ b/config/solaris/i386.c
@@ -0,0 +1,71 @@
+/*
+ * Coswitch for Windows using Visual C++.
+ *
+ * Written by Frank J. Lhota, based on an assembly version
+ * authored by Robert Goldberg and modified for OS/2 2.0 by Mark
+ * Emmer.
+ */
+
+#include <sys/asm_linkage.h>
+#include <sys/trap.h>
+
+/*
+ * The Windows co-expression context consists of 5 words. The
+ * following constants define the byte offsets for each of the
+ * registers stored in the context.
+ */
+
+#define SP_OFF "0"
+#define BP_OFF "4"
+#define SI_OFF "8"
+#define DI_OFF "12"
+#define BX_OFF "16"
+
+int	coswitch(old, new, first)
+int	*old;
+int	*new;
+int	first;
+{
+
+   /* Save current context to *old */
+   __asm__ __volatile__ (
+      "movl %%esp," SP_OFF "(%0)\n\t"
+      "movl %%ebp," BP_OFF "(%0)\n\t"
+      "movl %%esi," SI_OFF "(%0)\n\t"
+      "movl %%edi," DI_OFF "(%0)\n\t"
+      "movl %%ebx," BX_OFF "(%0)"
+      : : "a"( old )
+	  );
+
+   if ( first )
+      {
+      /* first != 0 => restore context in *new. */
+	  __asm__ __volatile__ (
+	     "movl " SP_OFF "(%0),%%esp\n\t"
+	     "movl " BP_OFF "(%0),%%ebp\n\t"
+	     "movl " SI_OFF "(%0),%%esi\n\t"
+	     "movl " DI_OFF "(%0),%%edi\n\t"
+	     "movl " BX_OFF "(%0),%%ebx"
+	     : : "a"( new )
+	     );
+      }
+   else
+      {
+      /*
+       * first == 0 => Set things up for first activation of this
+       *	       coexpression. Load stack pointer from first
+       *	       word of *new and call new_context, which
+       *	       should never return.
+       */
+	  __asm__ __volatile__ (
+	     "movl " SP_OFF "(%0),%%esp\n\t"
+	     "movl %%esp,%%ebp"
+	     : : "a"( new )
+	     );
+      new_context( 0, NULL );
+      syserr( "interp() returned in coswitch" );
+      }
+
+   return 0;
+}
+