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| author | Yaakov Selkowitz <yselkowitz@users.sourceforge.net> | 2014-08-10 12:44:26 -0500 |
|---|---|---|
| committer | Jon TURNEY <jon.turney@dronecode.org.uk> | 2015-04-21 13:50:18 +0100 |
| commit | 0c2c7562426aec7bdf9b54a7d6993153e0bce489 (patch) | |
| tree | 4387ea7b8845ead6deb4fd3190883acffed3a198 /src/Initialize.c | |
| parent | 171d82fa36bb601360da2cc519718c46f137c467 (diff) | |
Fix _XtInherit on x86_64 Windows
As noted in Initialize.c, _XtInherit needs special treatment as it's both called
as a function, and used as a value to compare with.
We need to change this trickery for x86_64, as the symbols are no longer
underscore prefixed, and the address is 64 bits.
We also cannot place the trampoline in the .data section, as it may be marked
no-execute, so we use a special section for it instead.
v2: Uses of XtInherit must also be marked dllimport, so that they do not use a
thunk, but instead indirect via the __imp_XtInherit auto-import. This avoids
problems with an incorrect relocation being calculated in the case where libXt
and a library using it (e.g. libXaw/libXaw3d/libXm/etc.) are loaded more than
2GiB apart from each other.
This is enough to build a working libXt for Cygwin x86_64, because it uses the
LP64 data model. I believe that more patches are needed for libXt to work
correctly when built for the Windows LLP64 data model.
Signed-off-by: Yaakov Selkowitz <yselkowitz@cygwin.com>
Reviewed-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>
Diffstat (limited to 'src/Initialize.c')
| -rw-r--r-- | src/Initialize.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/Initialize.c b/src/Initialize.c index 9783deb..61c8575 100644 --- a/src/Initialize.c +++ b/src/Initialize.c @@ -245,11 +245,20 @@ void _XtInherit(void) * cygwin-xfree: http://www.cygwin.com/ml/cygwin-xfree/2003-10/msg00000.html */ +#ifdef __x86_64__ +asm (".section .trampoline, \"dwx\" \n\ + .globl _XtInherit \n\ + _XtInherit: \n\ + jmp *_y(%rip) \n\ +_y: .quad __XtInherit \n\ + .text \n"); +#else asm (".data\n\ .globl __XtInherit \n\ __XtInherit: jmp *_y \n\ _y: .long ___XtInherit \n\ .text \n"); +#endif #define _XtInherit __XtInherit #endif |