linux

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Josh Poimboeuf 3116dee270 objtool: Combine UNWIND_HINT_RET_OFFSET and UNWIND_HINT_FUNC

commit b735bd3e68824316655252a931a3353a6ebc036f upstream.

The ORC metadata generated for UNWIND_HINT_FUNC isn't actually very
func-like.  With certain usages it can cause stack state mismatches
because it doesn't set the return address (CFI_RA).

Also, users of UNWIND_HINT_RET_OFFSET no longer need to set a custom
return stack offset.  Instead they just need to specify a func-like
situation, so the current ret_offset code is hacky for no good reason.

Solve both problems by simplifying the RET_OFFSET handling and
converting it into a more useful UNWIND_HINT_FUNC.

If we end up needing the old 'ret_offset' functionality again in the
future, we should be able to support it pretty easily with the addition
of a custom 'sp_offset' in UNWIND_HINT_FUNC.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/db9d1f5d79dddfbb3725ef6d8ec3477ad199948d.1611263462.git.jpoimboe@redhat.com
[bwh: Backported to 5.10:
 - Don't use bswap_if_needed() since we don't have any of the other fixes
   for mixed-endian cross-compilation
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2022-07-25 11:26:07 +02:00

accounting

…

arch

KVM: x86/speculation: Disable Fill buffer clear within guests

2022-06-16 13:27:59 +02:00

bootconfig

tools/bootconfig: Fix tracing_on option checking in ftrace2bconf.sh

2021-09-26 14:08:59 +02:00

bpf

tools/resolve_btfids: Do not print any commands when building silently

2022-02-08 18:30:39 +01:00