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PATCH: Add sysdeps/x86_64/x32/tls.h
- From: "H.J. Lu" <hongjiu dot lu at intel dot com>
- To: GNU C Library <libc-alpha at sourceware dot org>
- Date: Fri, 11 May 2012 08:30:58 -0700
- Subject: PATCH: Add sysdeps/x86_64/x32/tls.h
- Reply-to: "H.J. Lu" <hjl dot tools at gmail dot com>
X32 doesn't support 32-bit indirect call via memory. This patch
adds sysdeps/x86_64/x32/tls.h to define CALL_THREAD_FCT. We load
32-bit address in memory into return register first and do indirect call
via return register. Tested on Linux/x32. OK to install?
Thanks.
H.J.
---
* sysdeps/x86_64/x32/tls.h: New file.
diff --git a/nptl/sysdeps/x86_64/x32/tls.h b/nptl/sysdeps/x86_64/x32/tls.h
new file mode 100644
index 0000000..4603ad7
--- /dev/null
+++ b/nptl/sysdeps/x86_64/x32/tls.h
@@ -0,0 +1,41 @@
+/* Definition for thread-local data handling. nptl/x32 version.
+ Copyright (C) 2012 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _X32_TLS_H
+#define _X32_TLS_H 1
+
+#include <sysdeps/x86_64/tls.h>
+
+#ifndef __ASSEMBLER__
+
+# undef CALL_THREAD_FCT
+# define CALL_THREAD_FCT(descr) \
+ ({ void *__res; \
+ asm volatile ("movl %%fs:%P2, %%edi\n\t" \
+ "movl %%fs:%P1, %k0\n\t" \
+ "callq *%q0" \
+ : "=a" (__res) \
+ : "i" (offsetof (struct pthread, start_routine)), \
+ "i" (offsetof (struct pthread, arg)) \
+ : "di", "si", "cx", "dx", "r8", "r9", "r10", "r11", \
+ "memory", "cc"); \
+ __res; })
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* x32/tls.h */