Messages in this thread | | | From | "H.J. Lu" <> | Date | Sat, 20 May 2017 15:20:36 -0700 | Subject | Re: [PATCH 7/7] DWARF: add the config option |
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On Sat, May 20, 2017 at 2:58 PM, Andy Lutomirski <luto@kernel.org> wrote: > On Sat, May 20, 2017 at 1:01 PM, H.J. Lu <hjl.tools@gmail.com> wrote: >> On Sat, May 20, 2017 at 9:20 AM, Josh Poimboeuf <jpoimboe@redhat.com> wrote: >> >>>> >>>> (H.J., could we get a binutils feature that allows is to do: >>>> >>>> pushq %whatever >>>> .cfi_adjust_sp -8 >>>> ... >>>> popq %whatever >>>> .cfi_adjust_sp 8 >>>> >> >> Np. Compiler needs to generate this. >> > > How would the compiler generate this when inline asm is involved? For > the kernel, objtool could get around the need to have these > annotations, but not so much for user code? Is the compiler supposed > to parse the inline asm? Would the compiler provide some magic % code > to represent the current CFA base register?
Here is one example of inline asm with call frame info:
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/x86_64/sigaction.c;h=be058bac436d1cc9794b2b03107676ed99f6b872;hb=HEAD
-- H.J.
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