gencgc: More precise conservatism for pointers to boxed pages.

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

diff --git a/src/runtime/alpha-linux-os.c b/src/runtime/alpha-linux-os.c
index 3cb67b3..7781821 100644 (file)
--- a/src/runtime/alpha-linux-os.c
+++ b/src/runtime/alpha-linux-os.c
@@ -18,6 +18,7 @@
 #include <stdio.h>
 #include <sys/param.h>
 #include <sys/file.h>
+#include "sbcl.h"
 #include "./signal.h"
 #include "os.h"
 #include "arch.h"
@@ -25,7 +26,6 @@
 #include "interrupt.h"
 #include "interr.h"
 #include "lispregs.h"
-#include "sbcl.h"
 #include <sys/socket.h>
 #include <sys/utsname.h>
 
@@ -34,38 +34,40 @@
 #include <sys/time.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <asm/fpu.h>
 
 #include "validate.h"
 size_t os_vm_page_size;
 
-#if defined GENCGC             /* unlikely ... */
-#error SBCL Alpha does not work with the GENCGC
-#include "gencgc.h"
+#ifdef LISP_FEATURE_SB_THREAD
+#error "Define threading support functions"
+#else
+int arch_os_thread_init(struct thread *thread) {
+    return 1;                   /* success */
+}
+int arch_os_thread_cleanup(struct thread *thread) {
+    return 1;                   /* success */
+}
 #endif
 
-sigcontext_register_t   *
+
+os_context_register_t   *
 os_context_register_addr(os_context_t *context, int offset)
 {
     return &context->uc_mcontext.sc_regs[offset];
 }
 
-sigcontext_register_t *
-os_context_fpregister_addr(os_context_t *context, int offset)
+os_context_register_t *
+os_context_float_register_addr(os_context_t *context, int offset)
 {
     return &context->uc_mcontext.sc_fpregs[offset];
 }
 
-sigcontext_register_t *
+os_context_register_t *
 os_context_pc_addr(os_context_t *context)
 {
     return &((context->uc_mcontext).sc_pc);
 }
-sigcontext_register_t *
-os_context_sp_addr(os_context_t *context)
-{
-    lose("This was supposed to be an x86-only operation");
-    return 0;
-}
 
 sigset_t *
 os_context_sigmask_addr(os_context_t *context)
@@ -73,6 +75,29 @@ 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: 0x7E0000 is defined as something useful in constants.h,
+       but without the UL, which would probably lead to 32/64-bit
+       errors if we simply used it here.  Ugh.  CSR, 2003-09-15 */
+    arch_set_fp_control(os_context_fp_control(context) & ~(0x7e0000UL) &
+                        /* KLUDGE: for some reason that I don't
+                        understand, by the time we get here the
+                        "enable denormalized traps" bit in the fp
+                        control word is set.  Since we really don't
+                        want to tra every time someone types
+                        LEAST-POSITIVE-SINGLE-FLOAT into the repl,
+                        mask that bit out.  -- CSR, 2003-09-15 */
+                        ~(0x1UL<<6));
+}
+
 void os_flush_icache(os_vm_address_t address, os_vm_size_t length)
 {
     asm volatile ("imb" : : : "memory" );