Add FreeBSD mmap flags

Author: elicn

qiling/os/posix/const.py

@@ -647,6 +647,23 @@ class linux_mmap_flags(Flag):
     MAP_UNINITIALIZED   = 0x04000000
 
 
+# see: https://github.com/freebsd/freebsd-src/blob/master/sys/sys/mman.h
+class freebsd_mmap_flags(Flag):
+    MAP_FILE            = 0x00000000
+    MAP_SHARED          = 0x00000001
+    MAP_PRIVATE         = 0x00000002
+
+    MAP_FIXED           = 0x00000010
+    MAP_STACK           = 0x00000400
+    MAP_NOSYNC          = 0x00000800
+    MAP_ANONYMOUS       = 0x00001000
+    MAP_GUARD           = 0x00002000
+    MAP_EXCL            = 0x00004000
+    MAP_NOCORE          = 0x00020000
+
+    # define this alias for compatibility with other os flags
+    MAP_FIXED_NOREPLACE = MAP_EXCL
+
 # see: https://github.com/torvalds/linux/blob/master/arch/mips/include/uapi/asm/mman.h
 class mips_mmap_flags(Flag):
     MAP_FILE            = 0x00000000

qiling/os/posix/syscall/mman.py

@@ -80,7 +80,7 @@ def __select_mmap_flags(archtype: QL_ARCH, ostype: QL_OS):
 
         osflags = {
             QL_OS.LINUX:   mips_mmap_flags if archtype == QL_ARCH.MIPS else linux_mmap_flags,
-            QL_OS.FREEBSD: linux_mmap_flags,    # FIXME: need one for freebsd
+            QL_OS.FREEBSD: freebsd_mmap_flags,
             QL_OS.MACOS:   macos_mmap_flags,
             QL_OS.QNX:     qnx_mmap_flags       # FIXME: only for arm?
         }[ostype]