x86/vdso: Define BUILD_VDSO while building and emit .eh_frame in asm

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For the vDSO, user code wants runtime unwind info.  Make sure
that, if we use .cfi directives, we generate it.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/16e29ad8855e6508197000d8c41f56adb00d7580.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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This commit is contained in:

Andy Lutomirski 2015-10-05 17:47:58 -07:00 • committed by Ingo Molnar

parent 7b956f035a

commit f24f910884

2 changed files with 12 additions and 5 deletions

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4

arch/x86/entry/vdso/Makefile

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13

arch/x86/include/asm/dwarf2.h

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