Hi,
I'm just working on the Xenomai 2.5.1 Debian package and encountered
non-PIC code (evil! ;-) in the shared libraries (skins libraries).
You can see it with e.g.
$ readelf -d src/skins/native/.libs/libnative.so.3.0.0
The "TEXTREL" tag indicates non-PIC code.
$ scanelf -qT src/skins/native/.libs/libnative.so.3.0.0
Shows the function and code offset of the relocation.
With
$ objdump -d src/skins/native/.libs/libnative.so.3.0.0
I found the actual location of the relocation.
I prepared a patch (attached) that fixes it: First, the relocation
itself by letting GCC create the address in PIC style. Second, "extern
inline" looks a bit counterintuitive at first, but according to the GCC
manual, it seems to be what we want (macro behaviour).
Thanks Jan for reminding me!
bye,
Roland
--- xenomai-2.5.1.orig/include/asm-x86/syscall.h
+++ xenomai-2.5.1/include/asm-x86/syscall.h
@@ -161,9 +161,11 @@
".endif\n\t"
".endm\n\t");
-static inline void __xn_get_eip(void **dest)
+__attribute__((always_inline))
+extern inline void __xn_get_eip(void **dest)
{
- asm volatile("movl $1f, %0; 1:": "=m"(*dest));
+addr:
+ *dest = &&addr;
}
static inline void __xn_get_ebp(void **dest)
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