MIPS/LD/testsuite: mips-elf-flags: Add MIPS ABI Flags handling

Complement commit 351cdf24d223 ("[MIPS] Implement O32 FPXX, FP64 and
FP64A ABI extensions") and add optional MIPS ABI Flags handling to
`good_combination' in the `mips-elf-flags.exp' test script.  This lets
callers of this procedure request to examine MIPS ABI Flags in addition
to the `e_flags' member of the ELF file header so as to verify that
flags are merged correctly by LD.  The presence of further arguments
triggers this verification, in which case `readelf' is called with the
`-A' option additionally specified and the ISA member, the ISA Extension
member and the ASEs member will be examined as per the arguments.

Unlike with `readelf -h' output consider a failure to retrieve the
member requested a test case failure rather than an unresolved result.
This is because unlike with the `e_flags' member of the ELF file header
which is always there in any valid ELF file the MIPS ABI Flags structure
is optional in LD output and the absence of this structure when expected
is surely a bug in LD.

	ld/
	* testsuite/ld-mips-elf/mips-elf-flags.exp (good_combination):
	Add an `args' final argument and examination code for `readelf
	-A' output.  Update procedure description accordingly.

2 files changed, 56 insertions, 3 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 529850d..92d0003 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,6 +1,12 @@
 2017-06-27  Maciej W. Rozycki  <macro@imgtec.com>
 
 	* testsuite/ld-mips-elf/mips-elf-flags.exp (good_combination):
+	Add an `args' final argument and examination code for `readelf
+	-A' output.  Update procedure description accordingly.
+
+2017-06-27  Maciej W. Rozycki  <macro@imgtec.com>
+
+	* testsuite/ld-mips-elf/mips-elf-flags.exp (good_combination):
 	Use `remote_exec' to call `readelf'.  Log the command issued.
 
 2017-06-27  Maciej W. Rozycki  <macro@imgtec.com>
diff --git a/ld/testsuite/ld-mips-elf/mips-elf-flags.exp b/ld/testsuite/ld-mips-elf/mips-elf-flags.exp
index 9461cb6..dbe4132 100644
--- a/ld/testsuite/ld-mips-elf/mips-elf-flags.exp
+++ b/ld/testsuite/ld-mips-elf/mips-elf-flags.exp
@@ -57,8 +57,13 @@ proc assemble_for_flags {arglist} {
 
 # Assemble a file using each set of arguments in ARGLIST.  Check that
 # the objects can be linked together and that the `readelf -h' output
-# includes each flag named in FLAGS.
-proc good_combination {arglist flags} {
+# includes each flag named in FLAGS.  Additional one or more arguments
+# request the addition of the `-A' option to `readelf' invocation.  In
+# this case check MIPS ABI Flags reported for the ISA to match the
+# first of these arguments, the ISA Extension to match the second, and
+# the ASEs listed are exactly the same as those listed in the third,
+# passed as a TCL list.
+proc good_combination {arglist flags args} {
     global ld ldemul READELF
 
     set finalobj "tmpdir/mips-flags.o"
@@ -70,7 +75,8 @@ proc good_combination {arglist flags} {
     } elseif {![ld_link "$ld $ldemul" $finalobj "-r $objs"]} {
 	fail $testname
     } else {
-	set cmd "$READELF -h $finalobj"
+	set A [expr {[llength $args] > 0} ? {"A"} : {""}]
+	set cmd "$READELF -h$A $finalobj"
 	send_log "$cmd\n"
 	set cmdret [remote_exec host [concat sh -c [list "$cmd 2>&1"]]]
 	set output [lindex $cmdret 1]
@@ -91,6 +97,47 @@ proc good_combination {arglist flags} {
 		    set failed 1
 		}
 	    }
+
+	    set isa [string trim [lindex $args 0]]
+	    if {$isa != ""
+		&& (![regexp "ISA: *(\[^\n\r\]*)" $output full gotisa]
+		    || ![string match $isa $gotisa])} {
+		set failed 1
+	    }
+
+	    set ext [string trim [lindex $args 1]]
+	    if {$ext != ""
+		&& (![regexp "ISA Extension: *(\[^\n\r\]*)" \
+		      $output full gotext]
+		    || ![string match $ext $gotext])} {
+		set failed 1
+	    }
+
+	    set ases [string trim [lindex $args 2]]
+	    if {[llength $ases] > 0} {
+		if {![regexp "ASEs:\[\n\r\]+((?:\t\[^\n\r\]*\[\n\r\]+)*)" \
+		      $output full gotases]} {
+		    set failed 1
+		} else {
+		    # GOTASES is a list of strings separated by tab and
+		    # line separator characters.  Convert it to a TCL list.
+		    regsub -all "\[\n\r\t\]+" $gotases "\n" gotases
+		    set gotases [split [string trim $gotases] "\n"]
+
+		    foreach ase $ases {
+			set aseidx [lsearch -exact $gotases $ase]
+			if {$aseidx >= 0} {
+			    set gotases [lreplace $gotases $aseidx $aseidx]
+			} else {
+			    set failed 1
+			}
+		    }
+		    if {[llength $gotases] > 0} {
+			set failed 1
+		    }
+		}
+	    }
+
 	    if {$failed} {
 		fail $testname
 	    } else {