PATCH: Add Linux/x32 sysdep.h

[H.J. Lu]

Hi,

Most of x32 system calls return int32.  However, llseek returns int64.
This patch adds Linux/x32 sysdep.h so that we can control the system
call return type.  X32 uses

movq SYSCALL_ERROR_ERRNO@GOTTPOFF(%rip), %rcx

since TLS offset may be negative.  Tested on Linux/x32.  OK to
install?

Thanks.


H.J.

	* sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h: New file.

diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h b/sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h
new file mode 100644
index 0000000..0ea7bd8
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h
@@ -0,0 +1,59 @@
+/* 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 _LINUX_X32_SYSDEP_H
+#define _LINUX_X32_SYSDEP_H 1
+
+/* There is some commonality.  */
+#include <sysdeps/unix/sysv/linux/x86_64/sysdep.h>
+#include <sysdeps/x86_64/x32/sysdep.h>
+
+#ifdef __ASSEMBLER__
+
+# ifdef SYSCALL_RETURN_INT64
+#  define SYSCALL_SET_ERROR_RETURN orq $-1, %rax
+# else
+#  define SYSCALL_SET_ERROR_RETURN orl $-1, %eax
+# endif
+
+# ifndef PIC
+/* Nothing here.  */
+# elif RTLD_PRIVATE_ERRNO
+#  undef SYSCALL_ERROR_HANDLER
+#  define SYSCALL_ERROR_HANDLER			\
+0:						\
+  lea rtld_errno(%rip), %ecx;			\
+  xorl %edx, %edx;				\
+  subl %eax, %edx;				\
+  movl %edx, (%rcx);				\
+  SYSCALL_SET_ERROR_RETURN;			\
+  jmp L(pseudo_end);
+# else
+#  undef SYSCALL_ERROR_HANDLER
+#  define SYSCALL_ERROR_HANDLER			\
+0:						\
+  movq SYSCALL_ERROR_ERRNO@GOTTPOFF(%rip), %rcx;\
+  xorl %edx, %edx;				\
+  subl %eax, %edx;				\
+  movl %edx, %fs:(%rcx);			\
+  SYSCALL_SET_ERROR_RETURN;			\
+  jmp L(pseudo_end);
+# endif	/* PIC */
+
+#endif	/* __ASSEMBLER__ */
+
+#endif /* linux/x86_64/x32/sysdep.h */