Ignore "mapping symbols" like $a and $t. They seem to be an ARM-only

feature, used to indicate whether code is ARM or Thumb. Unfortunately
they confuse gprof, which outputs call graphs where every other function
is named "$a"... not very useful.

Rather than enumerating the different symbols, binutils ignores anything
beginning with '$', and that is what we will do here.

Thanks to Dale Rahn for useful tips along the way.
ok miod

1 files changed, 9 insertions, 0 deletions

diff --git a/usr.bin/gprof/elf.c b/usr.bin/gprof/elf.c
index 35330312725..5a2381325c9 100644
--- a/usr.bin/gprof/elf.c
+++ b/usr.bin/gprof/elf.c
@@ -144,5 +144,14 @@ wantsym(const Elf_Sym *sym, const char *strtab)
 #endif
 	return 0;
 
+#ifdef __arm__
+    /* ignore what gas calls "mapping symbols" */
+    {
+	const char *c = strtab + sym->st_name;
+	if (c[0] == '$')
+	    return 0;
+    }
+#endif
+
     return 1;
 }