X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Falpha-linux-os.c;h=45c9ffbee46126bfe8b1ca807e82bace04e67456;hb=422b88abf96f4842a3d0999cd3b80d96f5a153d6;hp=3597e044a2bedcd72333d172cee877dea5f9a162;hpb=68fd2d2dd6f265669a8957accd8a33e62786a97e;p=sbcl.git

diff --git a/src/runtime/alpha-linux-os.c b/src/runtime/alpha-linux-os.c
index 3597e04..45c9ffb 100644
--- a/src/runtime/alpha-linux-os.c
+++ b/src/runtime/alpha-linux-os.c
@@ -34,6 +34,7 @@
 #include <sys/time.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <asm/fpu.h>
 
 #include "validate.h"
 size_t os_vm_page_size;
@@ -67,6 +68,29 @@ os_context_sigmask_addr(os_context_t *context)
     return &context->uc_sigmask;
 }
 
+unsigned long
+os_context_fp_control(os_context_t *context)
+{
+    return ieee_fpcr_to_swcr((context->uc_mcontext).sc_fpcr);
+}
+
+void
+os_restore_fp_control(os_context_t *context)
+{
+    /* FIXME (in two parts):
+       Firstly, what happens in alpha linux inside the signal handler?
+       Does the floating point control state get cleared as in other
+       Linuxes?
+    
+       Secondly, how do we put it back if so? It will probably involve
+       something to do with
+    
+       context->uc_mcontext.sc_fpcr
+
+       (maybe a simple assembly statement will be enough)
+    */ 
+}
+
 void os_flush_icache(os_vm_address_t address, os_vm_size_t length)
 {
     asm volatile ("imb" : : : "memory" );