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84a7eb1f87
Glibc assumes that ENTRY_POINT is the lowest address for which we need
to keep profiling records and BFD linker uses a linker script to place
the input sections.
Starting from GCC 4.6, the main function is placed in .text.startup
section and starting from binutils 2.22, BFD linker with
commit add44f8d5c5c05e08b11e033127a744d61c26aee
Author: Alan Modra <amodra@gmail.com>
Date: Thu Nov 25 03:03:02 2010 +0000
* scripttempl/elf.sc: Group .text.exit, text.startup and .text.hot
sections.
places .text.startup section before .text section, which leave the main
function out of profiling records.
Starting from binutils 2.15, linker provides __executable_start to mark
the lowest address of the executable. Use __executable_start as the
lowest address to keep the main function in profiling records. This fixes
[BZ #28153].
Tested on Linux/x86-64, Linux/x32 and Linux/i686 as well as with
build-many-glibcs.py.
63 lines
1.5 KiB
Bash
63 lines
1.5 KiB
Bash
#!/bin/sh
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# Check the output of gprof against a carfully crafted binary.
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# Copyright (C) 2017-2021 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <https://www.gnu.org/licenses/>.
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LC_ALL=C
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export LC_ALL
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set -e
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exec 2>&1
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GPROF="$1"
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program="$2"
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data="$3"
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actual=$(mktemp)
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expected=$(mktemp)
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expected_dot=$(mktemp)
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cleanup () {
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rm -f "$actual"
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rm -f "$expected"
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rm -f "$expected_dot"
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}
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trap cleanup 0
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cat > "$expected" <<EOF
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f1 2000
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f2 1000
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f3 1
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EOF
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# Special version for powerpc with function descriptors.
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cat > "$expected_dot" <<EOF
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.f1 2000
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.f2 1000
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.f3 1
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EOF
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"$GPROF" -C "$program" "$data" \
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| awk -F '[(): ]' '/executions/{print $5, $8}' \
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| sort > "$actual"
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if cmp -s "$actual" "$expected_dot" \
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|| diff -u --label expected "$expected" --label actual "$actual" ; then
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echo "PASS"
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else
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echo "FAIL"
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exit 1
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fi
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