0.8.3.39:

[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 c5dc7a2..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)
@@ -67,7 +72,47 @@ os_context_sigmask_addr(os_context_t *context)
     return &context->uc_sigmask;
 }
 
-void os_flush_icache(os_vm_address_t address, os_vm_size_t length)
+unsigned long
+os_context_fp_control(os_context_t *context)
+{
+    /* So this may look like nice, well behaved code. However, closer
+       inspection reveals that gpr is simply the general purpose
+       registers, and PT_FPSCR is an offset that is larger than 32
+       (the number of ppc registers), but that happens to get the
+       right answer. -- CSR, 2002-07-11 */
+    return context->uc_mcontext.regs->gpr[PT_FPSCR]; 
+}
+
+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?
+
+       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_TRAPS_BYTE_MASK;
+    
+    d = *((double *) &control);
+    /* Hmp.  Apparently the following doesn't work either:
+       
+    asm volatile ("mtfsf 0xff,%0" : : "f" (d));
+
+    causing segfaults at the first GC.
+    */
+}
+
+void 
+os_flush_icache(os_vm_address_t address, os_vm_size_t length)
 {
     /* see ppc-arch.c */
     ppc_flush_icache(address,length);