PR gas/20649: MIPS: Fix GOT16/LO16 reloc pairing with comdat sections

Correct a regression from commit 8614eeee67f9 ("Traditional MIPS
patches"), <https://sourceware.org/ml/binutils/2000-07/msg00018.html>,
which caused symbols in linkonce or what is these days known as comdat
sections to be treated as external for the purpose of PIC relocation
generation even if their binding remains STB_LOCAL.  This in turn
disabled GOT16/LO16 relocation pairing with references to such symbols,
as no complementing LO16 relocation is expected for external GOT16
references in the o32 ABI, which ultimately leads to link errors, e.g.:

ld: comdat-reloc.o: Can't find matching LO16 reloc against `foo' for R_MIPS_GOT16 at 0x24 in section `.text.bar[bar]'

as with the LD test case included with this change.

Revert the special case for symbols in comdat sections then, making code
actually match `adjust_reloc_syms' as indicated in its explanatory
comment, and adjust calling code accordingly.  Also bring back the
corresponding description of what now is `s_is_linkonce', lost with
commit 5f0fe04bc550 ("Improved MIPS16/MIPS32 code intermixing for
gas."), <https://www.sourceware.org/ml/binutils/2006-07/msg00039.html>.

	gas/
	PR gas/20649
	* config/tc-mips.c (pic_need_relax): Don't check for linkonce
	symbols, remove the `segtype' parameter.
	(mips_frob_file, md_estimate_size_before_relax): Adjust
	accordingly.
	(s_is_linkonce): Add an explanatory comment.
	* testsuite/gas/mips/comdat-reloc.d: New test.
	* testsuite/gas/mips/comdat-reloc.s: New test source.
	* testsuite/gas/mips/mips.exp: Run the new test.

	ld/
	PR gas/20649
	* testsuite/ld-mips-elf/mips-elf.exp: Add PIC comdat GOT16/LO16
	relocation pairing link test.

3 files changed, 71 insertions, 0 deletions

diff --git a/gas/testsuite/gas/mips/comdat-reloc.d b/gas/testsuite/gas/mips/comdat-reloc.d
new file mode 100644
index 0000000..12d092a
--- /dev/null
+++ b/gas/testsuite/gas/mips/comdat-reloc.d
@@ -0,0 +1,31 @@
+#readelf: -gr
+#name: MIPS ELF o32 PIC comdat GOT16/LO16 relocation pairing
+#as: -32 -mno-pdr
+
+# Make sure the orphan GOT16 relocation is paired with LO16 for a local
+# symbol in a comdat section, i.e. rather than this:
+#
+# 00000014  00000509 R_MIPS_GOT16      00000000   foo
+# 00000020  00000506 R_MIPS_LO16       00000000   foo
+# 0000001c  00000509 R_MIPS_GOT16      00000000   foo
+#
+# we have this:
+#
+# 00000014  00000509 R_MIPS_GOT16      00000000   foo
+# 00000024  00000509 R_MIPS_GOT16      00000000   foo
+# 0000001c  00000506 R_MIPS_LO16       00000000   foo
+
+#...
+COMDAT group section \[.....\] `\.group' \[bar\] contains .+ sections:
+   \[Index\]    Name
+   \[.....\]   \.text\.foo
+   \[.....\]   \.text\.bar
+#...
+Relocation section '\.rel\.text\.bar' at offset .+ contains .+ entries:
+ Offset     Info    Type            Sym\.Value  Sym\. Name
+00000000  ......05 R_MIPS_HI16       00000000   _gp_disp
+00000004  ......06 R_MIPS_LO16       00000000   _gp_disp
+00000014  ......09 R_MIPS_GOT16      00000000   foo
+00000024  ......09 R_MIPS_GOT16      00000000   foo
+0000001c  ......06 R_MIPS_LO16       00000000   foo
+#pass
diff --git a/gas/testsuite/gas/mips/comdat-reloc.s b/gas/testsuite/gas/mips/comdat-reloc.s
new file mode 100644
index 0000000..be972bd
--- /dev/null
+++ b/gas/testsuite/gas/mips/comdat-reloc.s
@@ -0,0 +1,38 @@
+	.abicalls
+
+	.section	.text.foo, "axG", @progbits, bar, comdat
+	.align	2
+	.ent	foo
+	.type	foo, @function
+foo:
+	.frame	$sp, 0, $31
+	.mask	0x00000000, 0
+	.fmask	0x00000000, 0
+	jr	$31
+	.end	foo
+	.size	foo, . - foo
+
+	.section	.text.bar, "axG", @progbits, bar, comdat
+	.align	2
+	.globl	bar
+	.ent	bar
+	.type	bar, @function
+bar:
+	.frame	$sp, 0, $31
+	.mask	0x00000000, 0
+	.fmask	0x00000000, 0
+	.set	noreorder
+	.cpload	$25
+	.set	reorder
+	beqz	$4, 1f
+	.set	noreorder
+	lw	$2, %got(foo)($28)
+0:
+	jr	$31
+	 addiu	$2, $2, %lo(foo)
+1:
+	b	0b
+	 lw	$2, %got(foo)($28)
+	.set	reorder
+	.end	bar
+	.size	bar, . - bar
diff --git a/gas/testsuite/gas/mips/mips.exp b/gas/testsuite/gas/mips/mips.exp
index 6a1aa6c..106bd7b 100644
--- a/gas/testsuite/gas/mips/mips.exp
+++ b/gas/testsuite/gas/mips/mips.exp
@@ -1168,6 +1168,8 @@ if { [istarget mips*-*-vxworks*] } {
     }
     run_list_test_arches "elf-rel30" "-32" [mips_arch_list_all]
 
+    run_dump_test "comdat-reloc"
+
     run_dump_test "${tmips}mips${el}16-e"
     run_dump_test "${tmips}mips${el}16-f"