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Re: gprof SEGV issue for GCC-4.5.X toolchain.
On Jun 27, 2011, at 2:56 AM, amol pise wrote:
> Dear All,
> I have build the NetBSD-5.1 library by compiling it for ARMv7a (Cortex
> using the GNU GCC-4.5 toolchain.
> Now when I tried to build a sample scenario "hello.c" with profiling
> options "-pg" for gprof analysis.
> Now the new implementation uses "__gnu_mcount_nc".
> So the solution to resolve this issue is to add this new profiling
> hook "__gnu_mcount_nc" into NetBSD library.
Well, first of all, NetBSD doesn't use EABI. That ABI derives from bpabi.h
which isn't used by arm*-*-netbsdelf*. So you've built the wrong compiler to
use with NetBSD.
The profile ABI changed significantly for bpabi. In fact, NetBSD has its own
version of the profil call:
/* NetBSD does its profiling differently to the Acorn compiler. We
don't need a word following the mcount call; and to skip it
requires either an assembly stub or use of fomit-frame-pointer when
compiling the profiling functions. Since we break Acorn CC
compatibility below a little more won't hurt. */
#define ARM_FUNCTION_PROFILER(STREAM,LABELNO) \
fprintf(STREAM, "\tmov\t%sip, %slr\n", REGISTER_PREFIX, REGISTER_PREFIX); \
fprintf(STREAM, "\tbl\tmcount\n"); \
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