Add support for TLS in statically linked programs.

2 files changed, 53 insertions, 1 deletions

diff --git a/lib/libc/i386/gen/Makefile.inc b/lib/libc/i386/gen/Makefile.inc
index 7776387..709cf5d 100644
--- a/lib/libc/i386/gen/Makefile.inc
+++ b/lib/libc/i386/gen/Makefile.inc
@@ -1,6 +1,6 @@
 #	@(#)Makefile.inc	8.1 (Berkeley) 6/4/93
 # $FreeBSD$
 
-SRCS+=	_ctx_start.S _setjmp.S alloca.S fabs.S \
+SRCS+=	_ctx_start.S _setjmp.S _set_tp.c alloca.S fabs.S \
 	flt_rounds.c infinity.c ldexp.c makecontext.c modf.S \
 	rfork_thread.S setjmp.S signalcontext.c sigsetjmp.S
diff --git a/lib/libc/i386/gen/_set_tp.c b/lib/libc/i386/gen/_set_tp.c
new file mode 100644
index 0000000..d975b79
--- /dev/null
+++ b/lib/libc/i386/gen/_set_tp.c
@@ -0,0 +1,52 @@
+/*-
+ * Copyright (c) 2004 Doug Rabson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	$FreeBSD$
+ */
+
+#include <string.h>
+#include <stdint.h>
+#include <machine/segments.h>
+#include <machine/sysarch.h>
+
+void
+_set_tp(void *tp)
+{
+	union descriptor ldt;
+	int sel;
+
+	memset(&ldt, 0, sizeof(ldt));
+	ldt.sd.sd_lolimit = 0xffff;	/* 4G limit */
+	ldt.sd.sd_lobase = ((uintptr_t)tp) & 0xffffff;
+	ldt.sd.sd_type = SDT_MEMRWA;
+	ldt.sd.sd_dpl = SEL_UPL;
+	ldt.sd.sd_p = 1;		/* present */
+	ldt.sd.sd_hilimit = 0xf;	/* 4G limit */
+	ldt.sd.sd_def32 = 1;		/* 32 bit */
+	ldt.sd.sd_gran = 1;		/* limit in pages */
+	ldt.sd.sd_hibase = (((uintptr_t)tp) >> 24) & 0xff;
+	sel = i386_set_ldt(LDT_AUTO_ALLOC, &ldt, 1);
+	__asm __volatile("movl %0,%%gs" : : "rm" ((sel << 3) | 7));
+}