Support for GNU/kFreeBSD.

GNU/kFreeBSD is an experimental OS provided by the Debian project, consisting
of a FreeBSD kernel and GNU userland/libc. For a small number of cases, this
offers advantages over a more common GNU/Linux combination, such as fast
in-kernel support for ZFS storage.

This patch changes various ifdefs, either using __FreeBSD_kernel__ where a
trait from the kernel is what matters, or __GLIBC__ where a trait from the
C library matters.

This patch set has been carried downstream, in one form or another, since
1.2.3.1-1.

https://bugzilla.novell.com/show_bug.cgi?id=321634

4 files changed, 36 insertions, 11 deletions

diff --git a/libgc/configure.ac b/libgc/configure.ac
index 7dc04985a90..ac992abfaf9 100644
--- a/libgc/configure.ac
+++ b/libgc/configure.ac
@@ -114,6 +114,17 @@ case "$THREADS" in
 	AC_DEFINE(THREAD_LOCAL_ALLOC)
 	THREADDLLIBS="-lpthread -lrt"
 	;;
+     *-*-kfreebsd*-gnu)
+	AC_DEFINE(GC_FREEBSD_THREADS)
+	INCLUDES="$INCLUDES -pthread"
+	THREADDLLIBS=-pthread
+	AC_DEFINE(_REENTRANT)
+	if test "${enable_parallel_mark}" = yes; then
+		AC_DEFINE(PARALLEL_MARK)
+	fi
+	AC_DEFINE(THREAD_LOCAL_ALLOC)
+	AC_DEFINE(USE_COMPILER_TLS)
+	;;
       *-*-freebsd*)
 	AC_DEFINE(GC_FREEBSD_THREADS)
 	if test "x$PTHREAD_CFLAGS" != "x"; then
diff --git a/libgc/dyn_load.c b/libgc/dyn_load.c
index ca7ce54f194..5db3503aacb 100644
--- a/libgc/dyn_load.c
+++ b/libgc/dyn_load.c
@@ -26,7 +26,7 @@
  * None of this is safe with dlclose and incremental collection.
  * But then not much of anything is safe in the presence of dlclose.
  */
-#if (defined(__linux__) || defined(__native_client__)) && !defined(_GNU_SOURCE)
+#if (defined(__linux__) || defined(__GLIBC__) || defined(__native_client__)) && !defined(_GNU_SOURCE)
     /* Can't test LINUX, since this must be define before other includes */
 #   define _GNU_SOURCE
 #endif
@@ -394,7 +394,7 @@ GC_bool GC_register_main_static_data()
 /* For glibc 2.2.4+.  Unfortunately, it doesn't work for older	*/
 /* versions.  Thanks to Jakub Jelinek for most of the code.	*/
 
-# if (defined(LINUX) || defined(NACL)) /* Are others OK here, too? */ \
+# if (defined(LINUX) || defined (__GLIBC__) || defined(NACL)) /* Are others OK here, too? */ \
      && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
          || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) 
 
diff --git a/libgc/include/gc.h b/libgc/include/gc.h
index 4693a3d9a54..2265fdbd34a 100644
--- a/libgc/include/gc.h
+++ b/libgc/include/gc.h
@@ -497,7 +497,7 @@ GC_API GC_PTR GC_malloc_atomic_ignore_off_page GC_PROTO((size_t lb));
 #   define GC_RETURN_ADDR (GC_word)__return_address
 #endif
 
-#ifdef __linux__
+#if defined(__linux__) || defined(__GLIBC__)
 # include <features.h>
 # if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1 || __GLIBC__ > 2) \
      && !defined(__ia64__)
diff --git a/libgc/include/private/gcconfig.h b/libgc/include/private/gcconfig.h
index 418e046ae12..3cbab919b94 100644
--- a/libgc/include/private/gcconfig.h
+++ b/libgc/include/private/gcconfig.h
@@ -55,7 +55,7 @@
 # endif
 
 /* And one for FreeBSD: */
-# if defined(__FreeBSD__) && !defined(FREEBSD)
+# if (defined(__FreeBSD__) || defined(__FreeBSD_kernel__)) && !defined(FREEBSD)
 #    define FREEBSD
 # endif
 
@@ -1371,8 +1371,15 @@
 #	ifndef GC_FREEBSD_THREADS
 #	    define MPROTECT_VDB
 #	endif
-#      define SIG_SUSPEND SIGTSTP
-#      define SIG_THR_RESTART SIGCONT
+#       ifdef __GLIBC__
+#           define SIG_SUSPEND          (32+6)
+#           define SIG_THR_RESTART      (32+5)
+            extern int _end[];
+#           define DATAEND (_end)
+#       else
+#           define SIG_SUSPEND SIGTSTP
+#           define SIG_THR_RESTART SIGCONT
+#       endif
 #	define FREEBSD_STACKBOTTOM
 #	ifdef __ELF__
 #	    define DYNAMIC_LOADING
@@ -2132,8 +2139,15 @@
 #	ifndef GC_FREEBSD_THREADS
 #	    define MPROTECT_VDB
 #	endif
-#      define SIG_SUSPEND SIGTSTP
-#      define SIG_THR_RESTART SIGCONT
+#	ifdef __GLIBC__
+#	    define SIG_SUSPEND		(32+6)
+#	    define SIG_THR_RESTART	(32+5)
+	    extern int _end[];
+#	    define DATAEND (_end)
+#	else
+#	    define SIG_SUSPEND SIGUSR1
+#	    define SIG_THR_RESTART SIGUSR2
+#	endif
 #	define NEED_FIND_LIMIT
 #	define FREEBSD_STACKBOTTOM
 #	ifdef __ELF__
@@ -2230,7 +2244,7 @@
 #   define SUNOS5SIGS
 # endif
 
-# if defined(FREEBSD) && (__FreeBSD__ >= 4)
+# if defined(FREEBSD) && ((__FreeBSD__ >= 4) || (__FreeBSD_kernel__ >= 4))
 #   define SUNOS5SIGS
 # endif
 
@@ -2293,7 +2307,7 @@
 #   define CACHE_LINE_SIZE 32	/* Wild guess	*/
 # endif
 
-# ifdef LINUX
+# if defined(LINUX) || defined(__GLIBC__)
 #   define REGISTER_LIBRARIES_EARLY
     /* We sometimes use dl_iterate_phdr, which may acquire an internal	*/
     /* lock.  This isn't safe after the world has stopped.  So we must	*/
@@ -2374,7 +2388,7 @@
 #if defined(SPARC)
 # define CAN_SAVE_CALL_ARGS
 #endif
-#if (defined(I386) || defined(X86_64)) && defined(LINUX)
+#if (defined(I386) || defined(X86_64)) && (defined(LINUX) || defined(__GLIBC__))
 	    /* SAVE_CALL_CHAIN is supported if the code is compiled to save	*/
 	    /* frame pointers by default, i.e. no -fomit-frame-pointer flag.	*/
 # define CAN_SAVE_CALL_ARGS