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d54dba4199
rewind_stack_do_exit() UNWIND_HINT_FUNC /* Prevent any naive code from trying to unwind to our caller. */ xorl %ebp, %ebp movq PER_CPU_VAR(cpu_current_top_of_stack), %rax leaq -PTREGS_SIZE(%rax), %rsp UNWIND_HINT_REGS call do_exit Does unspeakable things to the stack, which objtool currently fails to detect due to a limitation in instruction decoding. This will be rectified after which the above will result in: arch/x86/entry/entry_64.o: warning: objtool: .text+0xab: unsupported stack register modification Allow the UNWIND_HINT on the next instruction to suppress this, it will overwrite the state anyway. Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Link: https://lkml.kernel.org/r/20210211173626.918498579@infradead.org |
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| .. | ||
| arch/x86 | ||
| Documentation | ||
| include/objtool | ||
| .gitignore | ||
| Build | ||
| builtin-check.c | ||
| builtin-orc.c | ||
| check.c | ||
| elf.c | ||
| Makefile | ||
| objtool.c | ||
| orc_dump.c | ||
| orc_gen.c | ||
| special.c | ||
| sync-check.sh | ||
| weak.c | ||