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| author | H. Peter Anvin <hpa@zytor.com> | 2025-12-16 13:26:00 -0800 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2026-01-13 16:37:58 -0800 |
| commit | 884961618ee51307cc63ab620a0bdd710fa0b0af (patch) | |
| tree | 4c9563f9d9fc74eeb88600a083b1e5732c9c0651 /tools/perf/lib/Documentation/tutorial/git@git.tavy.me:linux.git | |
| parent | 98d3e996513ad00b7824ea3bece506fc645547dd (diff) | |
x86/entry/vdso32: Remove open-coded DWARF in sigreturn.S
The vdso32 sigreturn.S contains open-coded DWARF bytecode, which
includes a hack for gdb to not try to step back to a previous call
instruction when backtracing from a signal handler.
Neither of those are necessary anymore: the backtracing issue is
handled by ".cfi_entry simple" and ".cfi_signal_frame", both of which
have been supported for a very long time now, which allows the
remaining frame to be built using regular .cfi annotations.
Add a few more register offsets to the signal frame just for good
measure.
Replace the nop on fallthrough of the system call (which should never,
ever happen) with a ud2a trap.
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://patch.msgid.link/20251216212606.1325678-7-hpa@zytor.com
Diffstat (limited to 'tools/perf/lib/Documentation/tutorial/git@git.tavy.me:linux.git')
0 files changed, 0 insertions, 0 deletions