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-rw-r--r--Rules.mak1
-rwxr-xr-xtest/plt/check-plt.sh38
2 files changed, 39 insertions, 0 deletions
diff --git a/Rules.mak b/Rules.mak
index ceb1e1019..e63f6a4b6 100644
--- a/Rules.mak
+++ b/Rules.mak
@@ -46,6 +46,7 @@ CC = $(CROSS)gcc
AR = $(CROSS)ar
LD = $(CROSS)ld
NM = $(CROSS)nm
+OBJDUMP = $(CROSS)objdump
STRIPTOOL = $(CROSS)strip
INSTALL = install
diff --git a/test/plt/check-plt.sh b/test/plt/check-plt.sh
new file mode 100755
index 000000000..bedc8fd35
--- /dev/null
+++ b/test/plt/check-plt.sh
@@ -0,0 +1,38 @@
+#!/bin/sh
+allowed="
+calloc
+free
+malloc
+memalign
+realloc
+"
+
+${OBJDUMP:-objdump} -d ${top_builddir:-../..}/lib/libc.so.? | \
+gawk -v allowed="${allowed}" '
+BEGIN {
+ COUNT = split(" " allowed, ALLOWED);
+}
+
+# Strip away the noise. The name will be like:
+# <brk>:
+# <foo@plt>
+function symstrip(name) {
+ return gensub(/.*<([^>@]*).*/, "\\1", "", name);
+}
+
+{
+# Match the start of the symbol disassembly
+# 00009720 <brk>:
+if ($2 ~ />:$/) {
+ f = symstrip($2);
+
+} else if ($NF ~ /@plt>/) {
+ rf = symstrip($NF);
+ for (a in ALLOWED) {
+ a = ALLOWED[a];
+ if (a == rf)
+ next;
+ }
+ print "Func " f " references " rf;
+}
+}' | sort -u