Re: [PATCH v6 0/6] x86/vdso: VDSO updates and fixes for sframes

H. Peter Anvin
2026-02-01T08:25:28Z

On January 29, 2026 3:27:20 AM PST, Jens Remus <jremus@linux.ibm.com> wrote:
>This enables generation of SFrame V3 stack trace information for VDSO on
>x86-64. It's a continuation of Josh's and Steve's work:
>
> https://lore.kernel.org/all/cover.1737511963.git.jpoimboe@kernel.org/
> https://lore.kernel.org/all/20250422183439.895236512@goodmis.org/
>
>This series focuses only on the VDSO code. They are helpful fixes
>and updates that doesn't rely on sframes (although the last patch
>is sframe related).
>
>This series applies on top of the latest unwind user sframe series
>"[PATCH v13 00/18] unwind_deferred: Implement sframe handling":
>https://lore.kernel.org/all/20260127150554.2760964-1-jremus@linux.ibm.com/
>
>Like above series it depends on the upcoming binutils 2.46 release to
>be used to build executables and libraries such as VDSO with SFrame V3
>stack trace information (using the assembler option --gsframe-3).
>
>Changes in v6:
>- SFrame V3 support (SFrame V2 is not supported).
>- Prevent GNU_SFRAME program table entry to empty .sframe section.
>- Integrate v5 review feedback. (Josh)
>
>Regards,
>Jens
>
>
>Josh Poimboeuf (6):
> x86/vdso: Fix DWARF generation for getrandom()
> x86/asm: Avoid emitting DWARF CFI for non-VDSO
> x86/asm: Simplify VDSO DWARF generation
> x86/vdso: Use SYM_FUNC_{START,END} in __kernel_vsyscall()
> x86/vdso: Use CFI macros in __vdso_sgx_enter_enclave()
> x86/vdso: Enable sframe generation in VDSO
>
> arch/Kconfig | 7 +++
> arch/x86/entry/vdso/Makefile | 10 +++--
> arch/x86/entry/vdso/vdso-layout.lds.S | 9 +++-
> arch/x86/entry/vdso/vdso32/system_call.S | 10 +----
> arch/x86/entry/vdso/vgetrandom-chacha.S | 3 +-
> arch/x86/entry/vdso/vsgx.S | 19 +++------
> arch/x86/include/asm/dwarf2.h | 54 +++++++++++++++++-------
> arch/x86/include/asm/linkage.h | 33 ++++++++++++---
> arch/x86/include/asm/vdso.h | 1 -
> 9 files changed, 97 insertions(+), 49 deletions(-)
>

This patchset clashes *hard* with the changes already in tip:x86/entry.