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Use __executable_start as the lowest address for profiling [BZ #28153]
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.
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@ -52,6 +52,11 @@ extern char ENTRY_POINT[];
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#endif
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extern char etext[];
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/* Use __executable_start as the lowest address to keep profiling records
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if it provided by the linker. */
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extern const char executable_start[] asm ("__executable_start")
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__attribute__ ((weak, visibility ("hidden")));
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#ifndef TEXT_START
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# ifdef ENTRY_POINT_DECL
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# define TEXT_START ENTRY_POINT
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@ -92,7 +97,10 @@ __gmon_start__ (void)
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called = 1;
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/* Start keeping profiling records. */
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__monstartup ((u_long) TEXT_START, (u_long) &etext);
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if (&executable_start != NULL)
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__monstartup ((u_long) &executable_start, (u_long) &etext);
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else
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__monstartup ((u_long) TEXT_START, (u_long) &etext);
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/* Call _mcleanup before exiting; it will write out gmon.out from the
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collected data. */
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@ -39,12 +39,14 @@ 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" "$data" \
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@ -39,6 +39,7 @@ trap cleanup 0
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cat > "$expected" <<EOF
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f1 2000
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f2 1000
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f3 1
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main 1
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EOF
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@ -46,6 +47,7 @@ EOF
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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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.main 1
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EOF
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