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PATCH: Add Linux/x32 sysdep.h
- From: "H.J. Lu" <hongjiu dot lu at intel dot com>
- To: GNU C Library <libc-alpha at sourceware dot org>
- Date: Tue, 15 May 2012 18:15:41 -0700
- Subject: PATCH: Add Linux/x32 sysdep.h
- Reply-to: "H.J. Lu" <hjl dot tools at gmail dot com>
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 */