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98 lines
2.9 KiB
98 lines
2.9 KiB
commit 84a7eb1f87c1d01b58ad887a0ab5d87abbc1c772 |
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Author: H.J. Lu <hjl.tools@gmail.com> |
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Date: Fri Jul 30 19:07:30 2021 -0700 |
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Use __executable_start as the lowest address for profiling [BZ #28153] |
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Glibc assumes that ENTRY_POINT is the lowest address for which we need |
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to keep profiling records and BFD linker uses a linker script to place |
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the input sections. |
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Starting from GCC 4.6, the main function is placed in .text.startup |
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section and starting from binutils 2.22, BFD linker with |
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commit add44f8d5c5c05e08b11e033127a744d61c26aee |
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Author: Alan Modra <amodra@gmail.com> |
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Date: Thu Nov 25 03:03:02 2010 +0000 |
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* scripttempl/elf.sc: Group .text.exit, text.startup and .text.hot |
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sections. |
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places .text.startup section before .text section, which leave the main |
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function out of profiling records. |
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Starting from binutils 2.15, linker provides __executable_start to mark |
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the lowest address of the executable. Use __executable_start as the |
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lowest address to keep the main function in profiling records. This fixes |
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[BZ #28153]. |
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Tested on Linux/x86-64, Linux/x32 and Linux/i686 as well as with |
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build-many-glibcs.py. |
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diff --git a/csu/gmon-start.c b/csu/gmon-start.c |
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index b3432885b39071cc..344606a676c188d4 100644 |
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--- a/csu/gmon-start.c |
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+++ b/csu/gmon-start.c |
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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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+ |
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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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diff --git a/gmon/tst-gmon-gprof.sh b/gmon/tst-gmon-gprof.sh |
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index 9d371582b99677fa..dc0be021104f725d 100644 |
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--- a/gmon/tst-gmon-gprof.sh |
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+++ b/gmon/tst-gmon-gprof.sh |
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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" "$data" \ |
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diff --git a/gmon/tst-gmon-static-gprof.sh b/gmon/tst-gmon-static-gprof.sh |
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index 79218df967f9387f..4cc99c80d0115271 100644 |
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--- a/gmon/tst-gmon-static-gprof.sh |
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+++ b/gmon/tst-gmon-static-gprof.sh |
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@@ -39,6 +39,7 @@ trap cleanup 0 |
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cat > "$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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