Re: ping: [testsuite patch] for: [PATCH] [PR corefiles/17808] i386: Fix internal error when prstatus in core file is too big

[Jan Kratochvil <jan dot kratochvil at redhat dot com>]

Hi Yao,

On Tue, 14 Jul 2015 10:52:33 +0200, Yao Qi wrote:
> this new test fails on i686 buildbot slaves,
> 
> (gdb) core-file /home/gdb-buildbot-2/fedora-x86-64-2/fedora-i686/build/gdb/testsuite/gdb.arch/i386-biarch-core.core
> "/home/gdb-buildbot-2/fedora-x86-64-2/fedora-i686/build/gdb/testsuite/gdb.arch/i386-biarch-core.core"
> is not a core dump: File format not recognized
> (gdb) FAIL: gdb.arch/i386-biarch-core.exp: core-file

There are two problems:

(1) The testcase did not really test if elf64-i386 is supported by GDB (BFD).
That was OK for a Fedora testcase but I forgot about it when submitting it
upstream.

I haven't really verified if the GNU target is elf64-little but it seems so,
no other one seems suitable from:
	elf32-x86-64
	elf64-big
	elf64-k1om
	elf64-l1om
	elf64-little
	elf64-x86-64
	pei-x86-64


(2) The output of the "core-file" command itself can be arbitrary as the
elf64-i386 file with x86_64 registers is really broken; but that does not
matter much, important is the following test whether core file memory is
readable.
	./configure --enable-64-bit-bfd
	(gdb) core-file /home/jkratoch/redhat/gdb-test-build32-plus64/gdb/testsuite/gdb.arch/i386-biarch-core.core^M
	warning: Couldn't find general-purpose registers in core file.^M
	Failed to read a valid object file image from memory.^M
	warning: Couldn't find general-purpose registers in core file.^M
	#0  <unavailable> in ?? ()^M
	(gdb) FAIL: gdb.arch/i386-biarch-core.exp: core-file
	x/i 0x400078^M
	   0x400078:    hlt    ^M
	(gdb) PASS: gdb.arch/i386-biarch-core.exp: .text is readable

OK for check-in a fix for (1) and (2) in this patch?


Jan

2015-07-14  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.arch/i386-biarch-core.exp: Replace istarget
	by "complete set gnutarget". Remove expectation for the "core-file"
	command.

diff --git a/gdb/testsuite/gdb.arch/i386-biarch-core.exp b/gdb/testsuite/gdb.arch/i386-biarch-core.exp
index 60d049b..9e05869 100644
--- a/gdb/testsuite/gdb.arch/i386-biarch-core.exp
+++ b/gdb/testsuite/gdb.arch/i386-biarch-core.exp
@@ -23,9 +23,20 @@
 
 standard_testfile
 
-if { ![istarget "i?86-*-*"] && ![istarget "x86_64-*-*"] } then {
-    verbose "Skipping i386-biarch-core test."
-    return
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+
+set test "complete set gnutarget"
+gdb_test_multiple "complete set gnutarget " $test {
+    -re "set gnutarget elf64-little\r\n(.*\r\n)?$gdb_prompt $" {
+	pass $test
+    }
+    -re "\r\n$gdb_prompt $" {
+	pass $test
+	untested ".text is readable"
+	return
+    }
 }
 
 set corebz2file ${srcdir}/${subdir}/${testfile}.core.bz2
@@ -43,16 +54,12 @@ if {$corestat(size) != 102400} {
     return -1
 }
 
-gdb_exit
-gdb_start
-gdb_reinitialize_dir $srcdir/$subdir
-
 # Wrongly built GDB complains by:
 # "..." is not a core dump: File format not recognized
 # As the provided test core has 64bit PRSTATUS i386 built GDB cannot parse it.
 # This is just a problem of the test case, real-world elf64-i386 file will have
 # 32bit PRSTATUS.  One cannot prepare elf64-i386 core file from elf32-i386 by
 # objcopy as it corrupts the core file beyond all recognition.
-gdb_test "core-file ${corefile}" "\r\nwarning: Unexpected size of section `\\.reg/6901' in core file\\.\r\n.*Core was generated by `\[^\r\n\]*'\\.\r\nProgram terminated with signal SIGSEGV, Segmentation fault\\.\r\n.*" "core-file"
+gdb_test "core-file ${corefile}" ".*" "core-file"
 
 gdb_test "x/i $address" "\r\n\[ \t\]*$address:\[ \t\]*hlt\[ \t\]*" ".text is readable"