[PATCH 2/2] LD/testsuite: Conditionalize the placement of `.got' in GNU_RELRO

["Maciej W. Rozycki" <macro at imgtec dot com>]

Complement commit d345186d0535 ("Check if GNU_RELRO segment is is 
generated") and exclude the presence of a `.got' section from implying 
the creation of a GNU_RELRO segment for targets which place the section 
along with small data, and therefore as it stands cannot have the 
section assigned to GNU_RELRO.  This is because we currently only 
support a single GNU_RELRO segment and we place it at the beginning of 
regular data which is then separated from small data by read-write data.

Currently the list of such targets consists of Alpha, Linux HPPA, NetBSD 
HPPA, OpenBSD HPPA, Meta, MIPS, Nios II, OpenRISC 1000, RISC-V, SH and 
X86-64, as determined by examining default linker scripts produced in a 
`--enable-targets=all' build for those that have DATA_SEGMENT_RELRO_END 
set and `.got' placed beyond.  These targets do not set NO_SMALL_DATA or 
DATA_GOT in their respective files in ld/emulparams/*, hovever checking 
for the absence of these settings on its own is not very feasible due to 
the structure of these files and the lack of support for GNU_RELRO by 
some targets in the first place.

Add a separate control for `.got.plt' which does get placed in GNU_RELRO 
on MIPS targets even though `.got' does not.

	ld/
	* testsuite/ld-elf/binutils.exp (binutils_test): Make the 
	expectation for `.got' in GNU_RELRO segment target-specific.
	Handle `.got.plt' separately.
---
 ld/testsuite/ld-elf/binutils.exp |   19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

binutils-ld-test-binutils-sdata-got.diff
Index: binutils/ld/testsuite/ld-elf/binutils.exp
===================================================================
--- binutils.orig/ld/testsuite/ld-elf/binutils.exp	2017-07-13 19:10:10.825455113 +0100
+++ binutils/ld/testsuite/ld-elf/binutils.exp	2017-07-14 01:36:48.122104727 +0100
@@ -86,13 +86,30 @@ proc binutils_test { prog_name ld_option
 	set relro_dynamic [expr !([istarget "hppa64*-*-*"] \
 				  || ([istarget "mips*-*-*"] \
 				      && ![istarget "*-*-vxworks*"]))]
+	# These targets have `.got' in regular data even though they do
+	# not have `.got' there.
+	set relro_gotplt [expr [istarget "mips*-*-*"]]
+	# These targets do not set NO_SMALL_DATA or DATA_GOT and therefore
+	# have `.got' in (read-write) small data rather than regular data.
+	set relro_got [expr !([istarget "alpha*-*-*"] \
+			      || [istarget "hppa*-*-linux-*"] \
+			      || [istarget "hppa*-*-netbsd*"] \
+			      || [istarget "hppa*-*-openbsd*"] \
+			      || [istarget "metag-*-*"] \
+			      || [istarget "mips*-*-*"] \
+			      || [istarget "nios2*-*-*"] \
+			      || [istarget "or1k-*-*"] \
+			      || [istarget "riscv*-*-*"] \
+			      || [istarget "sh*-*-*"] \
+			      || [istarget "x86_64-*-rdos*"])]
 	# Check if GNU_RELRO segment is generated.
 	set got [remote_exec host "grep GNU_RELRO tmpdir/$test.exp"]
 	if { ![string match "*GNU_RELRO*" $got] } then {
 	    set got [remote_exec host "cat tmpdir/$test.exp"]
 	    if { [string match "*.data.rel.ro*" $got]
 		 || ($relro_dynamic && [string match "*.dynamic*" $got])
-		 || [string match "*.got*" $got]
+		 || ($relro_gotplt && [string match "*.got.plt*" $got])
+		 || ($relro_got && [string match "*.got*" $got])
 		 || [string match "*.eh_frame*" $got]
 		 || [string match "*.gcc_except_table*" $got]
 		 || [string match "*.exception_ranges*" $got]