diff options
| author | Andy Lutomirski <luto@kernel.org> | 2015-10-06 02:47:58 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-10-09 09:41:05 +0200 |
| commit | f24f910884277aa6824bbc2dda4b5d0418d45c28 (patch) | |
| tree | b11e8b917f953cc7d887fa7d079a8570e3939532 /arch/x86/include/asm/dwarf2.h | |
| parent | x86/asm: Re-add parts of the manual CFI infrastructure (diff) | |
| download | linux-f24f910884277aa6824bbc2dda4b5d0418d45c28.tar.xz linux-f24f910884277aa6824bbc2dda4b5d0418d45c28.zip | |
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.h | 13 |
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 |