binutils/testsuite: Fix a crash with STN_UNDEF in relocation

Verify that `strip' completes successfully and a correct relocation
entry is copied for a relocation encountered with the STN_UNDEF symbol
index.

	binutils/
	* testsuite/binutils-all/strip-15.d: New test.
	* testsuite/binutils-all/strip-15rel.s: New test source.
	* testsuite/binutils-all/strip-15rela.s: New test source.
	* testsuite/binutils-all/strip-15mips64.s: New test source.
	* testsuite/binutils-all/objcopy.exp: Run the new test.

6 files changed, 85 insertions, 0 deletions

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index 0c1b95d21bc..c7a631aa821 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,5 +1,13 @@
 2018-04-09  Maciej W. Rozycki  <macro@mips.com>
 
+	* testsuite/binutils-all/strip-15.d: New test.
+	* testsuite/binutils-all/strip-15rel.s: New test source.
+	* testsuite/binutils-all/strip-15rela.s: New test source.
+	* testsuite/binutils-all/strip-15mips64.s: New test source.
+	* testsuite/binutils-all/objcopy.exp: Run the new test.
+
+2018-04-09  Maciej W. Rozycki  <macro@mips.com>
+
 	* testsuite/binutils-all/strip-14.d: New test.
 	* testsuite/binutils-all/strip-14rel.s: New test source.
 	* testsuite/binutils-all/strip-14rela.s: New test source.
diff --git a/binutils/testsuite/binutils-all/objcopy.exp b/binutils/testsuite/binutils-all/objcopy.exp
index 532bdc6ac76..366a4a34f89 100644
--- a/binutils/testsuite/binutils-all/objcopy.exp
+++ b/binutils/testsuite/binutils-all/objcopy.exp
@@ -1123,6 +1123,11 @@ if [is_elf_format] {
 				[list as "--defsym RELOC=${reloc}"] \
 				[list as [expr {[is_elf64 tmpdir/bintest.o] \
 				    ? "--defsym ELF64=1" : ""}]]]
+    run_dump_test "strip-15" [list \
+				[list source strip-15${reloc_format}.s] \
+				[list as "--defsym RELOC=${reloc}"] \
+				[list as [expr {[is_elf64 tmpdir/bintest.o] \
+				    ? "--defsym ELF64=1" : ""}]]]
 
     # This requires STB_GNU_UNIQUE support with OSABI set to GNU.
     if { [supports_gnu_unique] } {
diff --git a/binutils/testsuite/binutils-all/strip-15.d b/binutils/testsuite/binutils-all/strip-15.d
new file mode 100644
index 00000000000..03d7d1a78d6
--- /dev/null
+++ b/binutils/testsuite/binutils-all/strip-15.d
@@ -0,0 +1,8 @@
+#PROG: strip
+#strip: -g
+#readelf: -r
+
+Relocation section '\.rela?\.text' at offset .* contains 2 entries:
+ *Offset * Info * Type * Sym\. *Value * Sym\. *Name(?: * \+ * Addend)?
+0+00 * 0+0(?:1|32|103) * R_[^ ]* *(?: * 55aa)?
+#pass
diff --git a/binutils/testsuite/binutils-all/strip-15mips64.s b/binutils/testsuite/binutils-all/strip-15mips64.s
new file mode 100644
index 00000000000..a15c3772ca6
--- /dev/null
+++ b/binutils/testsuite/binutils-all/strip-15mips64.s
@@ -0,0 +1,14 @@
+	.text
+foo:
+	.dc.l    0x12345678
+
+	.section .rela.text
+	.dc.a	 0
+	.dc.l    0x00000000
+	.dc.b    0, 0, 0, RELOC
+	.dc.a	 0x000055aa
+
+	.dc.a	 0
+	.dc.l    0
+	.dc.b    0, 0, 0, 0
+	.dc.a	 0
diff --git a/binutils/testsuite/binutils-all/strip-15rel.s b/binutils/testsuite/binutils-all/strip-15rel.s
new file mode 100644
index 00000000000..1819a539e17
--- /dev/null
+++ b/binutils/testsuite/binutils-all/strip-15rel.s
@@ -0,0 +1,23 @@
+	.text
+foo:
+	.dc.l    0x12345678
+
+	.section .rel.text
+	.ifdef	 ELF64
+
+	.dc.a	 0
+	.dc.a    RELOC
+
+	.dc.a	 0
+	.dc.a    0
+	.else
+
+	# Some targets, such as `m68hc11-*', use 16-bit addresses.
+	# With them `.dc.a' emits 16-bit quantities, so we need to use
+	# `.dc.l' for 32-bit relocation data.
+	.dc.l	 0
+	.dc.l	 RELOC
+
+	.dc.l	 0
+	.dc.l    0
+	.endif
diff --git a/binutils/testsuite/binutils-all/strip-15rela.s b/binutils/testsuite/binutils-all/strip-15rela.s
new file mode 100644
index 00000000000..7bcd85e2836
--- /dev/null
+++ b/binutils/testsuite/binutils-all/strip-15rela.s
@@ -0,0 +1,27 @@
+	.text
+foo:
+	.dc.l    0x12345678
+
+	.section .rela.text
+	.ifdef	 ELF64
+
+	.dc.a	 0
+	.dc.a    RELOC
+	.dc.a	 0x00000000000055aa
+
+	.dc.a	 0
+	.dc.a    0
+	.dc.a	 0
+	.else
+
+	# Some targets, such as `h8300-*' or `ip2k-*', use 16-bit addresses.
+	# With them `.dc.a' emits 16-bit quantities, so we need to use
+	# `.dc.l' for 32-bit relocation data.
+	.dc.l	 0
+	.dc.l	 RELOC
+	.dc.l	 0x000055aa
+
+	.dc.l	 0
+	.dc.l	 0
+	.dc.l	 0
+	.endif