0.8.2.15:

[sbcl.git] / src / runtime / ppc-linux-os.c

diff --git a/src/runtime/ppc-linux-os.c b/src/runtime/ppc-linux-os.c
index 14411f6..f4fe13c 100644 (file)
--- a/src/runtime/ppc-linux-os.c
+++ b/src/runtime/ppc-linux-os.c
@@ -38,10 +38,15 @@
 #include "validate.h"
 size_t os_vm_page_size;
 
-#if defined GENCGC             /* unlikely ... */
-#error SBCL PPC does not work with the GENCGC
-#include "gencgc.h"
-#endif
+struct thread *arch_os_get_current_thread() {
+    return all_threads;
+}
+int arch_os_thread_init(struct thread *thread) {
+    return 1;                  /* success */
+}
+int arch_os_thread_cleanup(struct thread *thread) {
+    return 1;                  /* success */
+}
 
 os_context_register_t   *
 os_context_register_addr(os_context_t *context, int offset)
@@ -82,30 +87,28 @@ void
 os_restore_fp_control(os_context_t *context)
 {
     unsigned long control;
+    double d;
     
     control = os_context_fp_control(context) & 
-      /* FIXME: Should we preserve the user's requested rounding mode?
+       /* FIXME: Should we preserve the user's requested rounding mode?
 
-         Note that doing 
+       Note that doing 
+       
+       ~(FLOAT_STICKY_BITS_MASK | FLOAT_EXCEPTIONS_BYTE_MASK)
+       
+       here leads to infinite SIGFPE for invalid operations, as
+       there are bits in the control register that need to be
+       cleared that are let through by that mask. -- CSR, 2002-07-16 */
 
-        ~(FLOAT_STICKY_BITS_MASK | FLOAT_EXCEPTIONS_BYTE_MASK)
-
-        here leads to infinite SIGFPE for invalid operations, as
-        there are bits in the control register that need to be
-        cleared that are let through by that mask. -- CSR, 2002-07-16 */
-      FLOAT_TRAPS_BYTE_MASK;
+       FLOAT_TRAPS_BYTE_MASK;
     
-    /* FIXME: Shoot me now.
+    d = *((double *) &control);
+    /* Hmp.  Apparently the following doesn't work either:
        
-       Hardcoded nastiness: the "0"s below refer to the first floating
-       point registers -- we should let gcc deal with that. The 8(31)
-       refers to the position on the stack, less one, of control (we
-       need for control to be the high word of the double loaded by
-       lfd; how do I know that r31 contains the stack? I don't, I'm
-       just guessing. The 255, on the other hand, is a valid constant
-       -- it says "move everything in the upper word into the floating
-       point control register. -- CSR, 2002-07-16 */
-    asm ("stw %0, 12(31); lfd 0, 8(31); mtfsf 255, 0" : : "r" (control) : "r31");
+    asm volatile ("mtfsf 0xff,%0" : : "f" (d));
+
+    causing segfaults at the first GC.
+    */
 }
 
 void