On Tue, 29 May 2018 15:15:22 -0700 Thomas Garnier <[email protected]> wrote:
> When using -fPIE/PIC with function tracing, the compiler generates a > call through the GOT (call *__fentry__@GOTPCREL). This instruction > takes 6 bytes instead of 5 on the usual relative call. > > If PIE is enabled, replace the 6th byte of the GOT call by a 1-byte nop > so ftrace can handle the previous 5-bytes as before. > > Position Independent Executable (PIE) support will allow to extend the > KASLR randomization range 0xffffffff80000000. I thought you were going to write a update to recordmcount.c to handle this at compile time? -- Steve > > Signed-off-by: Thomas Garnier <[email protected]> > --- >
