2004-08-17 17:34:28 +02:00
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#ifndef UNW_REMOTE_ONLY
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/*
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* Create a special unwind-table entry which makes it easy for an
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* unwinder to locate the dynamic registration list. The special
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* entry covers address range [0-0) and is therefore guaranteed to be
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* the first in the unwind-table.
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*/
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.global _U_dyn_info_list
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.hidden _U_dyn_info_list
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.section .IA_64.unwind_info,"a","progbits"
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.info: data8 (1<<48) | 1 /* v1, length==1 (8-byte word) */
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data8 0 /* 8 empty .prologue directives (nops) */
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data8 0 /* personality routine (ignored) */
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string "dyn-list" /* lsda */
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data8 @gprel(_U_dyn_info_list)
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.section .IA_64.unwind, "a", "progbits"
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data8 0, 0, @segrel(.info)
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#endif
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Mark Wielaard <mwielaard@redhat.com> writes:
On some systems executable stacks are denied. Since libunwind and the
tests don't actually need executable stacks this patch marks all
assembly files as not needing it.
The original patch comes from frysk:
2007-04-05 Jan Kratochvil <jan.kratochvil@redhat.com>
* src/hppa/getcontext.S, src/hppa/setcontext.S, src/hppa/siglongjmp.S,
src/ia64/Ginstall_cursor.S, src/ia64/Linstall_cursor.S,
src/ia64/dyn_info_list.S, src/ia64/getcontext.S, src/ia64/longjmp.S,
src/ia64/setjmp.S, src/ia64/siglongjmp.S, src/ia64/sigsetjmp.S,
src/ppc64/longjmp.S, src/ppc64/siglongjmp.S, src/x86/longjmp.S,
src/x86/siglongjmp.S, src/x86_64/longjmp.S, src/x86_64/setcontext.S,
src/x86_64/siglongjmp.S: Stack should be non-executable, for SELinux.
I added a couple more markers for new files in current libunwind.
Before this patch you would get the following on selinux enabled
systems without allow_exec_stack: error while loading shared
libraries:
libunwind.so.7: cannot enable executable stack as shared object
requires: Permission denied
After the patch that error disappears and all test results are similar
to the results on systems without executable stack protection.
2007-10-01 16:35:01 +02:00
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#ifdef __linux__
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/* We do not need executable stack. */
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.section .note.GNU-stack,"",@progbits
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#endif
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