You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
99 lines
2.9 KiB
99 lines
2.9 KiB
2 years ago
|
commit 84a7eb1f87c1d01b58ad887a0ab5d87abbc1c772
|
||
|
|
Author: H.J. Lu <hjl.tools@gmail.com>
|
||
|
|
Date: Fri Jul 30 19:07:30 2021 -0700
|
||
|
|
|
||
|
|
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.
|
||
|
|
|
||
|
|
diff --git a/csu/gmon-start.c b/csu/gmon-start.c
|
||
|
|
index b3432885b39071cc..344606a676c188d4 100644
|
||
|
|
--- a/csu/gmon-start.c
|
||
|
|
+++ b/csu/gmon-start.c
|
||
|
|
@@ -52,6 +52,11 @@ extern char ENTRY_POINT[];
|
||
|
|
#endif
|
||
|
|
extern char etext[];
|
||
|
|
|
||
|
|
+/* Use __executable_start as the lowest address to keep profiling records
|
||
|
|
+ if it provided by the linker. */
|
||
|
|
+extern const char executable_start[] asm ("__executable_start")
|
||
|
|
+ __attribute__ ((weak, visibility ("hidden")));
|
||
|
|
+
|
||
|
|
#ifndef TEXT_START
|
||
|
|
# ifdef ENTRY_POINT_DECL
|
||
|
|
# define TEXT_START ENTRY_POINT
|
||
|
|
@@ -92,7 +97,10 @@ __gmon_start__ (void)
|
||
|
|
called = 1;
|
||
|
|
|
||
|
|
/* Start keeping profiling records. */
|
||
|
|
- __monstartup ((u_long) TEXT_START, (u_long) &etext);
|
||
|
|
+ if (&executable_start != NULL)
|
||
|
|
+ __monstartup ((u_long) &executable_start, (u_long) &etext);
|
||
|
|
+ else
|
||
|
|
+ __monstartup ((u_long) TEXT_START, (u_long) &etext);
|
||
|
|
|
||
|
|
/* Call _mcleanup before exiting; it will write out gmon.out from the
|
||
|
|
collected data. */
|
||
|
|
diff --git a/gmon/tst-gmon-gprof.sh b/gmon/tst-gmon-gprof.sh
|
||
|
|
index 9d371582b99677fa..dc0be021104f725d 100644
|
||
|
|
--- a/gmon/tst-gmon-gprof.sh
|
||
|
|
+++ b/gmon/tst-gmon-gprof.sh
|
||
|
|
@@ -39,12 +39,14 @@ trap cleanup 0
|
||
|
|
cat > "$expected" <<EOF
|
||
|
|
f1 2000
|
||
|
|
f2 1000
|
||
|
|
+f3 1
|
||
|
|
EOF
|
||
|
|
|
||
|
|
# Special version for powerpc with function descriptors.
|
||
|
|
cat > "$expected_dot" <<EOF
|
||
|
|
.f1 2000
|
||
|
|
.f2 1000
|
||
|
|
+.f3 1
|
||
|
|
EOF
|
||
|
|
|
||
|
|
"$GPROF" -C "$program" "$data" \
|
||
|
|
diff --git a/gmon/tst-gmon-static-gprof.sh b/gmon/tst-gmon-static-gprof.sh
|
||
|
|
index 79218df967f9387f..4cc99c80d0115271 100644
|
||
|
|
--- a/gmon/tst-gmon-static-gprof.sh
|
||
|
|
+++ b/gmon/tst-gmon-static-gprof.sh
|
||
|
|
@@ -39,6 +39,7 @@ trap cleanup 0
|
||
|
|
cat > "$expected" <<EOF
|
||
|
|
f1 2000
|
||
|
|
f2 1000
|
||
|
|
+f3 1
|
||
|
|
main 1
|
||
|
|
EOF
|
||
|
|
|
||
|
|
@@ -46,6 +47,7 @@ EOF
|
||
|
|
cat > "$expected_dot" <<EOF
|
||
|
|
.f1 2000
|
||
|
|
.f2 1000
|
||
|
|
+.f3 1
|
||
|
|
.main 1
|
||
|
|
EOF
|
||
|
|
|