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authorAndy Lutomirski <luto@kernel.org>2015-10-06 03:47:58 +0300
committerIngo Molnar <mingo@kernel.org>2015-10-09 10:41:05 +0300
commitf24f910884277aa6824bbc2dda4b5d0418d45c28 (patch)
treeb11e8b917f953cc7d887fa7d079a8570e3939532 /arch/x86/include/asm/dwarf2.h
parent7b956f035a9ef8bd3ef5490f49fc1bd834d8a70a (diff)
downloadlinux-f24f910884277aa6824bbc2dda4b5d0418d45c28.tar.xz
x86/vdso: Define BUILD_VDSO while building and emit .eh_frame in asm
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>
Diffstat (limited to 'arch/x86/include/asm/dwarf2.h')
-rw-r--r--arch/x86/include/asm/dwarf2.h13
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/x86/include/asm/dwarf2.h b/arch/x86/include/asm/dwarf2.h
index de1cdaf4d743..09133ba032b3 100644
--- a/arch/x86/include/asm/dwarf2.h
+++ b/arch/x86/include/asm/dwarf2.h
@@ -36,15 +36,22 @@
#endif
#if defined(CONFIG_AS_CFI_SECTIONS) && defined(__ASSEMBLY__)
+#ifndef BUILD_VDSO
/*
* Emit CFI data in .debug_frame sections, not .eh_frame sections.
* The latter we currently just discard since we don't do DWARF
* unwinding at runtime. So only the offline DWARF information is
- * useful to anyone. Note we should not use this directive if this
- * file is used in the vDSO assembly, or if vmlinux.lds.S gets
- * changed so it doesn't discard .eh_frame.
+ * useful to anyone. Note we should not use this directive if
+ * vmlinux.lds.S gets changed so it doesn't discard .eh_frame.
*/
.cfi_sections .debug_frame
+#else
+ /*
+ * For the vDSO, emit both runtime unwind information and debug
+ * symbols for the .dbg file.
+ */
+ .cfi_sections .eh_frame, .debug_frame
+#endif
#endif
#else