[project @ 1998-11-26 09:17:22 by sof]

[ghc-hetmet.git] / ghc / runtime / storage / mprotect.lc

diff --git a/ghc/runtime/storage/mprotect.lc b/ghc/runtime/storage/mprotect.lc
index dabf3c4..1cef887 100644 (file)
--- a/ghc/runtime/storage/mprotect.lc
+++ b/ghc/runtime/storage/mprotect.lc
@@ -7,7 +7,7 @@
 %*                                                                     *
 %************************************************************************
 
-Is @mprotect@ POSIX now?
+Is @mprotect@ POSIX now? [Yup, POSIX.4 -- sof]
 
 \begin{code}
 #if STACK_CHECK_BY_PAGE_FAULT
@@ -45,23 +45,35 @@ Is @mprotect@ POSIX now?
 # endif
 
 #if defined(sunos4_TARGET_OS)
-extern int getpagesize PROTO((void));
-extern int mprotect PROTO((caddr_t, size_t, int));
+int getpagesize PROTO((void));
+int mprotect PROTO((caddr_t, size_t, int));
 #endif
 
+#if defined(aix_TARGET_OS)
+/* PROT_NONE doesn't work on aix, PROT_READ works and should suit the job */
+#define PROT_NONE PROT_READ
+#endif
+ 
 /* Needed for FreeBSD (SDM, 96/03) */
 #ifndef PROT_NONE
 #define PROT_NONE 0
 #endif
 
+/* For VirtualProtect() and its flags */
+#if defined(cygwin32_TARGET_OS)
+#include <windows.h>
+#endif
+
 void 
-unmapMiddleStackPage(addr_, size)
-char * /*caddr_t*/ addr_;
+unmapMiddleStackPage(addr, size)
+char * /*caddr_t*/ addr;
 int size;
 {
     int pagesize = GETPAGESIZE();
-    caddr_t addr = addr_;
-    caddr_t middle = (caddr_t) (((W_) (addr + size / 2)) / pagesize * pagesize);
+    char * middle = (char *) (((W_) (addr + size / 2)) / pagesize * pagesize);
+#if defined(cygwin32_TARGET_OS)
+    unsigned int old_prot;
+#endif
 
 # ifdef STK_CHK_DEBUG
     fprintf(stderr, "pagesize: %x\nstack start: %08lx\nstack size: %08lx\nstack middle: %08lx\n",
@@ -72,7 +84,14 @@ int size;
        fprintf(stderr, "Stack too small; stack overflow trap disabled.\n");
        return;
     }
+/* mprotect() is broken in beta18, so we use the native Win32
+   call instead
+*/
+#if defined(cygwin32_TARGET_OS)
+    if (VirtualProtect(middle, pagesize, PAGE_NOACCESS, &old_prot) == 0) {
+#else
     if (mprotect(middle, pagesize, PROT_NONE) == -1) {
+#endif
        perror("mprotect");
        EXIT(EXIT_FAILURE);
     }