Date: Wed, 04 Jul 2007 20:30:05 -0700 From: Garrett Cooper <youshi10@u.washington.edu> To: current@freebsd.org Subject: Can't profile automatically on x86/amd64 (after gcc 3.4.6 -> 4.2 upgrade?) Message-ID: <468C65BD.6050007@u.washington.edu>
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I don't know why but it appears that I can't automatically profile
programs compiled with -pg. I've tried compensating by using
clock_gettime(2), but I believe my energies can be better focused
elsewhere instead of entering in a slew of printf(2) statements, by
using gprof(1).
When I try and use -pg under x86, the compiled program segfaults and
when I try and backtrace the binary it segfaults and there appears to be
an infinite recursion problem, then it dies at a point when it can't
access the memory address:
Program received signal SIGSEGV, Segmentation fault.
0x080506b4 in ?? ()
(gdb) bt
#0 0x080506b4 in ?? ()
#1 0x33cb8a00 in ?? ()
#2 0x33d3a951 in ?? ()
#3 0xbfbfeb38 in ?? ()
#4 0x33c91530 in ?? ()
#5 0x00000007 in ?? ()
#6 0x33cb71c0 in ?? ()
#7 0xbfbfeacc in ?? ()
// etc ...
#1350 0x90feeb80 in ?? ()
#1351 0xbfbfed28 in ?? ()
#1352 0x00000001 in ?? ()
#1353 0xbfbfed30 in ?? ()
#1354 0x00000013 in ?? ()
Error accessing memory address 0xbfc00000: Bad address.
When I try and do the same under amd64, gprof(1) says "bad format"
(an error attributed to bfd(1) not being able to decypher the bin info
of the .gmon file).
-Garrett
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