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| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2025-04-08 10:02:14 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-04-08 10:14:11 +0300 |
| commit | fe1042b1ef79e4d5df33d5c0f0ce936493714eec (patch) | |
| tree | 30710f1b8faf6c8849840d13f1c88f0f68d42f9f /rust/helpers/build_assert.c | |
| parent | a8df7d0ef92eca28c610206c6748daf537ac0586 (diff) | |
| download | linux-fe1042b1ef79e4d5df33d5c0f0ce936493714eec.tar.xz | |
objtool: Split INSN_CONTEXT_SWITCH into INSN_SYSCALL and INSN_SYSRET
INSN_CONTEXT_SWITCH is ambiguous. It can represent both call semantics
(SYSCALL, SYSENTER) and return semantics (SYSRET, IRET, RETS, RETU).
Those differ significantly: calls preserve control flow whereas returns
terminate it.
Objtool uses an arbitrary rule for INSN_CONTEXT_SWITCH that almost works
by accident: if in a function, keep going; otherwise stop. It should
instead be based on the semantics of the underlying instruction.
In preparation for improving that, split INSN_CONTEXT_SWITCH into
INSN_SYCALL and INSN_SYSRET.
No functional change.
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/19a76c74d2c051d3bc9a775823cafc65ad267a7a.1744095216.git.jpoimboe@kernel.org
Diffstat (limited to 'rust/helpers/build_assert.c')
0 files changed, 0 insertions, 0 deletions