1 files changed, 73 insertions, 0 deletions
diff --git a/sysdeps/s390/dl-tls.h b/sysdeps/s390/dl-tls.h
new file mode 100644
index 0000000000..fbd85c1753
--- /dev/null
+++ b/sysdeps/s390/dl-tls.h
@@ -0,0 +1,73 @@
+/* Thread-local storage handling in the ELF dynamic linker.  s390 version.
+   Copyright (C) 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+
+/* Type used for the representation of TLS information in the GOT.  */
+typedef struct
+{
+  unsigned long int ti_module;
+  unsigned long int ti_offset;
+} tls_index;
+
+
+#ifdef SHARED
+/* This is the prototype for the GNU version.  */
+extern void *__tls_get_addr (tls_index *ti) attribute_hidden;
+extern unsigned long __tls_get_offset (unsigned long got_offset);
+
+/* The special thing about the s390 TLS ABI is that we do not have the
+   standard __tls_get_addr function but the __tls_get_offset function
+   which differs in two important aspects:
+   1) __tls_get_offset gets a got offset instead of a pointer to the
+      tls_index structure
+   2) __tls_get_offset returns the offset of the requested variable to
+      the thread descriptor instead of a pointer to the variable.
+ */
+#if defined __s390x__
+asm("\n\
+	.text\n\
+	.globl __tls_get_offset\n\
+	.type __tls_get_offset, @function\n\
+	.align 4\n\
+__tls_get_offset:\n\
+	la	%r2,0(%r2,%r12)\n\
+	jg	__tls_get_addr\n\
+");
+#elif defined __s390__
+asm("\n\
+	.text\n\
+	.globl __tls_get_offset\n\
+	.type __tls_get_offset, @function\n\
+	.align 4\n\
+__tls_get_offset:\n\
+	basr	%r3,0\n\
+0:	la	%r2,0(%r2,%r12)\n\
+	l	%r4,1f-0b(%r3)\n\
+	b	0(%r4,%r3)\n\
+1:	.long	__tls_get_addr - 0b\n\
+");
+#endif
+
+#define GET_ADDR_OFFSET \
+  (ti->ti_offset - (unsigned long) __builtin_thread_pointer ())
+
+#define __TLS_GET_ADDR(__ti) \
+  (__tls_get_addr(__ti) + (unsigned long) __builtin_thread_pointer ())
+
+#endif