On Wed, 4 Oct 2017 14:19:56 -0700 Thomas Garnier <thgar...@google.com> 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. > > With this change, function tracing supports 6 bytes on traceable > function and can still replace relative calls on the ftrace assembly > functions. > > Position Independent Executable (PIE) support will allow to extended the > KASLR randomization range below the -2G memory limit. Question: This 6 bytes is only the initial call that gcc creates. When function tracing is enabled, the calls are back to the normal call to the ftrace trampoline? -- Steve _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
