Messages in this thread | | | Date | Thu, 19 Nov 2009 14:05:48 -0700 | From | Jeff Law <> | Subject | Re: BUG: GCC-4.4.x changes the function frame on some functions |
| |
On 11/19/09 12:50, H. Peter Anvin wrote: > > Calling the profiler immediately at the entry point is clearly the more > sane option. It means the ABI is well-defined, stable, and independent > of what the actual function contents are. It means that ABI isn't the > normal C ABI (the __fentry__ function would have to preserve all > registers), but that's fine... > Note there are targets (even some old x86 variants) that required the profiling calls to occur after the prologue. Unfortunately, nobody documented *why* that was the case. Sigh.
Jeff
| |