gprof 2.14 glitches w/ powerpc elf binaries

[Njuguna Njoroge]

Hello,

I observed that when gprof is executed w/ binaries targeted for the
PowerPC (like the 405D in our case), gprof inserts functions in the
histogram and call graph tables that were never executed (i.e. their
addresses were never referenced). I am generating the gmon.out files
from a trace output file generated by RISCWatch Debugger. In the
gmon.out files my script generates, each address has its own histogram
bin, so I believe that should rule out functions aliasing to the same
bins. Fortunately, these "phantom" functions are reported to use
typically < 1% of the total runtime, so they do not significantly skew
the results. However, they do clutter the profile when the program has
many sub-routines. Below is an example of a program we profiled. Note
that functions like "memcpy" or "Letext" were never called, yet it
appears on the profile.

Flat profile:

Each sample counts as 1 seconds.
  %   cumulative   self              self     total
 time   seconds   seconds    calls   s/call   s/call  name
 21.92 542868.31 542868.31    13742    39.50    39.50  memset
 17.83 984301.77 441433.46      687   642.55   803.65  XGPprocess_tx
 14.76 1349834.96 365533.20      687   532.07  1616.06  XGPemac_SgSend
 11.74 1640602.95 290767.99      688   422.63   490.98  XGPqueue_insert
  7.62 1829297.55 188694.60    27640     6.83     6.83
XCache_FlushDCacheLine
  5.22 1958459.10 129161.55                             main
  3.71 2050218.04 91758.94      688   133.37  1149.21
XIntc_DeviceInterruptHandler
  3.38 2133800.13 83582.09                             <locore>
  2.64 2199067.93 65267.80      687    95.00   921.67  XGPIntrHandlerDma

  2.03 2249366.09 50298.16      689    73.00    73.00  XGPemac_SgStart
  1.28 2280969.95 31603.86      687    46.00    46.00  XGPGetTxBD
  1.21 2310947.73 29977.79
XCache_DisableDCache
  1.20 2340544.00 29596.27     1376    21.51    21.51  XIo_DcrIn
  0.86 2361857.42 21313.42     1375    15.50    15.50  XTime_GetTime
  0.68 2378714.14 16856.72      688    24.50    24.50  TxIntHandler
  0.60 2393590.78 14876.64      137   108.59   115.42  XGPprocess_rx
  0.60 2408394.42 14803.64      688    21.52    21.52  XIo_DcrOut
  0.57 2422493.02 14098.61      688    20.49  1169.70
XIntc_InterruptHandler
  0.28 2429364.32  6871.30                             memcpy
  0.27 2435978.60  6614.28      689     9.60     9.60  XGPqueue_pop
  0.04 2437010.65  1032.04                             SetupInterrupts
  0.04 2438042.69  1032.04
XIntc_VoidInterruptHandler
  0.04 2439073.24  1030.54                             XGPSetDmaChannel
  0.03 2439760.76   687.53                             XTime_SetTime
  0.01 2440105.28   344.51
XGPemac_SetSgErrorHandler
  0.01 2440449.29   344.01
LookupConfigByBaseAddress
  0.01 2440793.31   344.01
XIntc_LowLevelInterruptHandler
  0.00 2440793.31     0.00     2062     0.00     0.00  Letext