On Sat, May 20, 2017 at 2:58 PM, Andy Lutomirski <luto@xxxxxxxxxx> wrote: > On Sat, May 20, 2017 at 1:01 PM, H.J. Lu <hjl.tools@xxxxxxxxx> wrote: >> On Sat, May 20, 2017 at 9:20 AM, Josh Poimboeuf <jpoimboe@xxxxxxxxxx> 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. -- To unsubscribe from this list: send the line "unsubscribe live-patching" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
