handle MAP_FLAGMASK

Hi,

NetBSD doesn't have MAP_FLAGMASK. Attached patch fixes this.

AMD Saxony, Dresden, Germany
Operating System Research Center

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Index: bsd-user/mmap.c
===================================================================
@@ -30,6 +30,10 @@
 
 //#define DEBUG_MMAP
 
+#ifndef MAP_FLAGMASK
+#define MAP_FLAGMASK	~MAP_ALIGNMENT_MASK
+#endif
+
 #if defined(USE_NPTL)
 pthread_mutex_t mmap_mutex;
 static int __thread mmap_lock_count;

The code blindly uses native definitions, but the BSDs differ in some cases.

FreeBSD:
#define MAP_HASSEMAPHORE 0x0200 /* region may contain semaphores */
#define MAP_STACK 0x0400 /* region grows down, like a stack */
#define MAP_NOSYNC 0x0800 /* page to but do not sync underlying file */

NetBSD:
#define MAP_HASSEMAPHORE 0x0200 /* region may contain semaphores */
#define MAP_TRYFIXED 0x0400 /* attempt hint address, even within break */
#define MAP_WIRED 0x0800 /* mlock() mapping when it is established */

OpenBSD:
#define MAP_HASSEMAPHORE 0x0200 /* region may contain semaphores */
#define MAP_TRYFIXED 0x0400 /* attempt hint address, even within heap */

Same for madvise flags.

So we need TARGET_FREEBSD_MAP_HASSEMAPHORE etc. and specific handling for each OS, like the syscalls are handled.