[project @ 2004-08-13 13:04:50 by simonmar]

[ghc-hetmet.git] / ghc / rts / RtsStartup.c

diff --git a/ghc/rts/RtsStartup.c b/ghc/rts/RtsStartup.c
index 0c5c2a3..59300c4 100644 (file)
--- a/ghc/rts/RtsStartup.c
+++ b/ghc/rts/RtsStartup.c
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: RtsStartup.c,v 1.75 2003/08/22 22:24:15 sof Exp $
+ * $Id: RtsStartup.c,v 1.81 2004/08/13 13:10:32 simonmar Exp $
  *
  * (c) The GHC Team, 1998-2002
  *
@@ -13,7 +13,6 @@
 #include "RtsUtils.h"
 #include "RtsFlags.h"  
 #include "Storage.h"    /* initStorage, exitStorage */
-#include "StablePriv.h" /* initStablePtrTable */
 #include "Schedule.h"   /* initScheduler */
 #include "Stats.h"      /* initStats */
 #include "Signals.h"
@@ -21,11 +20,11 @@
 #include "Weak.h"
 #include "Ticky.h"
 #include "StgRun.h"
-#include "StgStartup.h"
 #include "Prelude.h"           /* fixupRTStoPreludeRefs */
 #include "HsFFI.h"
 #include "Linker.h"
 #include "ThreadLabels.h"
+#include "BlockAlloc.h"
 
 #if defined(RTS_GTK_FRONTPANEL)
 #include "FrontPanel.h"
@@ -60,12 +59,40 @@
 #include <locale.h>
 #endif
 
-// Flag Structure
-struct RTS_FLAGS RtsFlags;
+#ifdef HAVE_TERMIOS_H
+#include <termios.h>
+#endif
+#ifdef HAVE_SIGNAL_H
+#include <signal.h>
+#endif
 
 // Count of how many outstanding hs_init()s there have been.
 static int hs_init_count = 0;
 
+// Here we save the terminal settings on the standard file
+// descriptors, if we need to change them (eg. to support NoBuffering
+// input).
+static void *saved_termios[3] = {NULL,NULL,NULL};
+
+void*
+__hscore_get_saved_termios(int fd)
+{
+  return (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) ?
+    saved_termios[fd] : NULL;
+}
+
+void
+__hscore_set_saved_termios(int fd, void* ts)
+{
+  if (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) {
+    saved_termios[fd] = ts;
+  }
+}
+
+#if i386_TARGET_ARCH
+static void x86_init_fpu ( void );
+#endif
+
 /* -----------------------------------------------------------------------------
    Starting up the RTS
    -------------------------------------------------------------------------- */
@@ -172,7 +199,11 @@ hs_init(int *argc, char **argv[])
 #endif
 
 #ifdef HAVE_LOCALE_H
-    setlocale(LC_ALL,"");
+    setlocale(LC_CTYPE,"");
+#endif
+
+#if i386_TARGET_ARCH
+//    x86_init_fpu();
 #endif
 
     /* Record initialization times */
@@ -258,12 +289,14 @@ hs_add_root(void (*init_root)(void))
        barf("hs_add_root() must be called after hs_init()");
     }
 
-    init_sp = 0;
+    /* The initialisation stack grows downward, with sp pointing 
+       to the last occupied word */
+    init_sp = INIT_STACK_BLOCKS*BLOCK_SIZE_W;
     bd = allocGroup(INIT_STACK_BLOCKS);
     init_stack = (F_ *)bd->start;
-    init_stack[init_sp++] = (F_)stg_init_ret;
+    init_stack[--init_sp] = (F_)stg_init_finish;
     if (init_root != NULL) {
-       init_stack[init_sp++] = (F_)init_root;
+       init_stack[--init_sp] = (F_)init_root;
     }
     
     cap.r.rSp = (P_)(init_stack + init_sp);
@@ -297,14 +330,14 @@ hs_exit(void)
     /* start timing the shutdown */
     stat_startExit();
     
-    /* stop all running tasks */
-    exitScheduler();
-    
 #if !defined(GRAN)
     /* Finalize any remaining weak pointers */
     finalizeWeakPointersNow();
 #endif
     
+    /* stop all running tasks */
+    exitScheduler();
+    
 #if defined(GRAN)
     /* end_gr_simulation prints global stats if requested -- HWL */
     if (!RtsFlags.GranFlags.GranSimStats.Suppressed)
@@ -319,6 +352,27 @@ hs_exit(void)
     resetNonBlockingFd(1);
     resetNonBlockingFd(2);
 
+#if HAVE_TERMIOS_H
+    // Reset the terminal settings on the standard file descriptors,
+    // if we changed them.  See System.Posix.Internals.tcSetAttr for
+    // more details, including the reason we termporarily disable
+    // SIGTTOU here.
+    { 
+       int fd;
+       sigset_t sigset, old_sigset;
+       sigemptyset(&sigset);
+       sigaddset(&sigset, SIGTTOU);
+       sigprocmask(SIG_BLOCK, &sigset, &old_sigset);
+       for (fd = 0; fd <= 2; fd++) {
+           struct termios* ts = (struct termios*)__hscore_get_saved_termios(fd);
+           if (ts != NULL) {
+               tcsetattr(fd,TCSANOW,ts);
+           }
+       }
+       sigprocmask(SIG_SETMASK, &old_sigset, NULL);
+    }
+#endif
+
 #if defined(PAR)
     /* controlled exit; good thread! */
     shutdownParallelSystem(0);
@@ -410,3 +464,28 @@ stg_exit(int n)
   exit(n);
 }
 
+/* -----------------------------------------------------------------------------
+   Initialise floating point unit on x86
+   -------------------------------------------------------------------------- */
+
+#if i386_TARGET_ARCH
+static void
+x86_init_fpu ( void )
+{
+  __volatile unsigned short int fpu_cw;
+
+  // Grab the control word
+  __asm __volatile ("fnstcw %0" : "=m" (fpu_cw));
+
+#if 0
+  printf("fpu_cw: %x\n", fpu_cw);
+#endif
+
+  // Set bits 8-9 to 10 (64-bit precision).
+  fpu_cw = (fpu_cw & 0xfcff) | 0x0200;
+
+  // Store the new control word back
+  __asm __volatile ("fldcw %0" : : "m" (fpu_cw));
+}
+#endif
+