0.7.3.10: Fix the SIGILL with ev6 and later Alphas: icache needs flushing

[sbcl.git] / src / runtime / x86-linux-os.c

diff --git a/src/runtime/x86-linux-os.c b/src/runtime/x86-linux-os.c
index 7c14c44..560babb 100644 (file)
--- a/src/runtime/x86-linux-os.c
+++ b/src/runtime/x86-linux-os.c
@@ -1,10 +1,18 @@
 /*
  * The x86 Linux incarnation of arch-dependent OS-dependent routines.
- * See also linux-os.c
+ * See also "linux-os.c".
  */
 
-
-/* header files lifted wholesale from linux-os.c, some may be redundant */
+/*
+ * This software is part of the SBCL system. See the README file for
+ * more information.
+ *
+ * This software is derived from the CMU CL system, which was
+ * written at Carnegie Mellon University and released into the
+ * public domain. The software is in the public domain and is
+ * provided with absolutely no warranty. See the COPYING and CREDITS
+ * files for more information.
+ */
 
 #include <stdio.h>
 #include <sys/param.h>
@@ -39,7 +47,7 @@ size_t os_vm_page_size;
  * gregs[], but it's conditional on __USE_GNU and not defined, so
  * we need to do this nasty absolute index magic number thing
  * instead. */
-register_t *
+os_context_register_t *
 os_context_register_addr(os_context_t *context, int offset)
 {
     switch(offset) {
@@ -55,17 +63,36 @@ os_context_register_addr(os_context_t *context, int offset)
     }
     return &context->uc_mcontext.gregs[offset];
 }
-register_t *
+
+os_context_register_t *
 os_context_pc_addr(os_context_t *context)
 {
     return &context->uc_mcontext.gregs[14];
 }
-register_t *
+
+os_context_register_t *
 os_context_sp_addr(os_context_t *context)
 {
     return &context->uc_mcontext.gregs[17];
 }
 
+unsigned long
+os_context_fp_control(os_context_t *context)
+{
+    /* probably the code snippet
+     * #ifdef __linux__
+     *    SET_FPU_CONTROL_WORD(context->__fpregs_mem.cw);
+     * #endif 
+     * is relevant to implementing this correctly */
+
+    /* Note that currently this is not called, as there is an analogous
+     * stub in lisp-land (x86-vm.lisp), also returning 0, with the old
+     * lisp fp-control code. This is here more as a signpost of a possible
+     * way of restoring functionality, and if it is the way to go would
+     * need to be included for other architectures as well. */
+    return 0;
+}
+
 sigset_t *
 os_context_sigmask_addr(os_context_t *context)
 {