[gdb/testsuite] Handle PAC marker

On aarch64-linux, I run into:
...
FAIL: gdb.base/annota1.exp: backtrace from shlibrary (timeout)
...
due to the PAC marker showing up:
...
^Z^Zframe-address^M
0x000000000041025c [PAC]^M
^Z^Zframe-address-end^M
...

In the docs the marker is documented as follows:
...
When GDB is debugging the AArch64 architecture, and the program is using the
v8.3-A feature Pointer Authentication (PAC), then whenever the link register
$lr is pointing to an PAC function its value will be masked.  When GDB prints
a backtrace, any addresses that required unmasking will be postfixed with the
marker [PAC].  When using the MI, this is printed as part of the addr_flags
field.
...

Update the test-case to allow the PAC marker.

Likewise in a few other test-cases.

While we're at it, rewrite the affected pattern pat_begin in annota1.exp into
a more readable form.  Likewise for the corresponding pat_end.

Tested on aarch64-linux.

Approved-By: Luis Machado <luis.machado@arm.com>

PR testsuite/31202
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31202

gdb/testsuite/gdb.base/annota1.exp

@@ -284,9 +284,52 @@ gdb_test_multiple "continue" "continue to printf" {
 # annotate-frame-address
 # annotate-frame-address-end
 #
-set pat_begin "\r\n\032\032post-prompt\r\n\r\n\032\032frame-begin 0 $hex\r\n.0  \r\n(\032\032frame-address\r\n$hex\r\n\032\032frame-address-end\r\n in \r\n)*\032\032frame-function-name\r\n.*printf(@.*)?\r\n\032\032frame-args\r\n \\(.*frame-end\r\n\r\n\032\032frame-begin 1 $hex\r\n.1  \r\n\032\032frame-address\r\n$hex\r\n\032\032frame-address-end\r\n in \r\n\032\032frame-function-name\r\nmain\r\n\032\032frame-args\r\n \\(\\)\r\n\032\032frame-source-begin\r\n at \r\n\032\032frame-source-file\r\n"
+set pat_begin \
+    [list \
+	 "\r\n\032\032post-prompt\r\n" \
+	 "\r\n\032\032frame-begin 0 $hex\r\n" \
+	 ".0  \r\n" \
+	 "(" \
+	 "\032\032frame-address\r\n" \
+	 "${hex}( \\\[PAC\\\])?" \
+	 "\r\n\032\032frame-address-end\r\n" \
+	 " in \r\n" \
+	 ")*" \
+	 "\032\032frame-function-name\r\n" \
+	 ".*printf(@.*)?" \
+	 "\r\n\032\032frame-args\r\n" \
+	 " \\(.*frame-end\r\n" \
+	 "\r\n\032\032frame-begin 1 $hex\r\n" \
+	 ".1  " \
+	 "\r\n\032\032frame-address\r\n" \
+	 "${hex}( \\\[PAC\\\])?" \
+	 "\r\n\032\032frame-address-end\r\n" \
+	 " in " \
+	 "\r\n\032\032frame-function-name\r\n" \
+	 "main" \
+	 "\r\n\032\032frame-args\r\n" \
+	 " \\(\\)" \
+	 "\r\n\032\032frame-source-begin\r\n" \
+	 " at " \
+	 "\r\n\032\032frame-source-file\r\n"]
 
-set pat_end "\r\n\032\032frame-source-file-end\r\n:\r\n\032\032frame-source-line\r\n.*\r\n\032\032frame-source-end\r\n\r\n\r\n\032\032frame-end\r\n(\r\n\032\032frame-begin .*\r\n\r\n\032\032frame-end\r\n)*$gdb_prompt$"
+set pat_begin [join $pat_begin ""]
+
+set pat_end \
+    [list \
+	 "\r\n\032\032frame-source-file-end\r\n" \
+	 ":" \
+	 "\r\n\032\032frame-source-line\r\n" \
+	 ".*" \
+	 "\r\n\032\032frame-source-end\r\n\r\n" \
+	 "\r\n\032\032frame-end\r\n" \
+	 "(" \
+	 "\r\n\032\032frame-begin .*\r\n" \
+	 "\r\n\032\032frame-end\r\n" \
+	 ")*" \
+	 "$gdb_prompt$"]
+
+set pat_end [join $pat_end ""]
 
 gdb_test_multiple "backtrace" "backtrace from shlibrary" {
     -re "$pat_begin$escapedsrcfile$pat_end" {

gdb/testsuite/gdb.cp/exception.exp

@@ -111,7 +111,7 @@ gdb_test "continue"  \
 
 set name "backtrace after first throw"
 gdb_test_multiple "backtrace" $name {
-    -re ".*#\[0-9\]+.*\[\[:<:\]\]__cxa_throw\[\[:>:\]\].*#\[0-9\]+${ws}$hex in foo \\(i=20\\) at .*${srcfile}:\[0-9\]+\r\n#\[0-9\]+${ws}$hex in main \\(.*\\) at .*${srcfile}:\[0-9\]+\r\n$gdb_prompt $" {
+    -re ".*#\[0-9\]+.*\[\[:<:\]\]__cxa_throw\[\[:>:\]\].*#\[0-9\]+${ws}$hex (\\\[PAC\\\] )?in foo \\(i=20\\) at .*${srcfile}:\[0-9\]+\r\n#\[0-9\]+${ws}$hex in main \\(.*\\) at .*${srcfile}:\[0-9\]+\r\n$gdb_prompt $" {
 	# Either __cxxabiv1::__cxa_throw or __cxa_throw can be printed
 	# depending on debug info presence.
 	pass $name
@@ -129,7 +129,7 @@ gdb_test "continue" \
 
 set name "backtrace after first catch"
 gdb_test_multiple "backtrace" $name {
-    -re ".*#\[0-9\]+.*\[\[:<:\]\]__cxa_begin_catch\[\[:>:\]\].*#\[0-9\]+${ws}$hex in main \\(.*\\) at .*$srcfile:\[0-9\]+\r\n$gdb_prompt $" {
+    -re ".*#\[0-9\]+.*\[\[:<:\]\]__cxa_begin_catch\[\[:>:\]\].*#\[0-9\]+${ws}$hex (\\\[PAC\\\] )?in main \\(.*\\) at .*$srcfile:\[0-9\]+\r\n$gdb_prompt $" {
 	pass $name
     }
 }
@@ -148,7 +148,7 @@ gdb_test "continue" \
 
 set name "backtrace after second throw"
 gdb_test_multiple "backtrace" $name {
-    -re ".*#\[0-9\]+.*\[\[:<:\]\]__cxa_throw\[\[:>:\]\].*#\[0-9\]+${ws}$hex in foo \\(i=20\\) at .*${srcfile}:\[0-9\]+\r\n#\[0-9\]+${ws}$hex in main \\(.*\\) at .*${srcfile}:\[0-9\]+\r\n$gdb_prompt $" {
+    -re ".*#\[0-9\]+.*\[\[:<:\]\]__cxa_throw\[\[:>:\]\].*#\[0-9\]+${ws}$hex (\\\[PAC\\\] )?in foo \\(i=20\\) at .*${srcfile}:\[0-9\]+\r\n#\[0-9\]+${ws}$hex in main \\(.*\\) at .*${srcfile}:\[0-9\]+\r\n$gdb_prompt $" {
 	pass $name
     }
 }
@@ -164,7 +164,7 @@ gdb_test "continue" \
 
 set name "backtrace after second catch"
 gdb_test_multiple "backtrace" $name {
-    -re ".*#\[0-9\]+.*\[\[:<:\]\]__cxa_begin_catch\[\[:>:\]\].*#\[0-9\]+${ws}$hex in main \\(.*\\) at .*$srcfile:\[0-9\]+\r\n$gdb_prompt $" {
+    -re ".*#\[0-9\]+.*\[\[:<:\]\]__cxa_begin_catch\[\[:>:\]\].*#\[0-9\]+${ws}$hex (\\\[PAC\\\] )?in main \\(.*\\) at .*$srcfile:\[0-9\]+\r\n$gdb_prompt $" {
 	pass $name
     }
 }

gdb/testsuite/gdb.dwarf2/entry-value-typedef.exp

@@ -42,4 +42,4 @@ gdb_test "continue" "Catchpoint $::decimal \\(exception thrown\\).*"
 
 # Without the corresponding fix, GDB would hit an internal error before
 # printing the frame for main.
-gdb_test "backtrace" " $::hex in func \\(t=t@entry=@$::hex: 1234\\).* $::hex in main .*"
+gdb_test "backtrace" " $::hex (\\\[PAC\\\] )?in func \\(t=t@entry=@$::hex: 1234\\).* $::hex in main .*"

gdb/testsuite/gdb.mi/mi-catch-cpp-exceptions.exp

@@ -68,7 +68,7 @@ proc continue_to_next_exception { func line testname } {
     mi_expect_stop "exception-caught" ".*" ".*" ".*" ".*" \
 	{} "run until an exception is caught: $testname"
     mi_gdb_test "-stack-list-frames 1 1" \
-	"\\^done,stack=\\\[frame=\{level=\"1\",addr=\"$hex\",func=\"${func}\",.*,line=\"${line}\".*\}\\\]" \
+	"\\^done,stack=\\\[frame=\{level=\"1\",addr=\"$hex\",(addr_flags=\"PAC\",)?func=\"${func}\",.*,line=\"${line}\".*\}\\\]" \
 	"check previous frame: $testname"
 }
 

gdb/testsuite/gdb.mi/mi-syn-frame.exp

@@ -76,7 +76,7 @@ mi_gdb_test "406-data-evaluate-expression have_a_very_merry_interrupt()" \
 # in this next output.
 
 mi_gdb_test "407-stack-list-frames" \
-  "407\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"subroutine\",file=\".*mi-syn-frame.c\",fullname=\"${fullname_syntax}${srcfile}\",line=\"$decimal\",arch=\"$any\"\},frame=\{level=\"1\",addr=\"$hex\",func=\"handler\",file=\".*mi-syn-frame.c\",fullname=\"${fullname_syntax}${srcfile}\",line=\"$decimal\",arch=\"$any\"\},frame=\{level=\"2\",addr=\"$hex\",func=\"<signal handler called>\"\},.*frame=\{level=\"$decimal\",addr=\"$hex\",func=\"have_a_very_merry_interrupt\",file=\".*mi-syn-frame.c\",fullname=\"${fullname_syntax}${srcfile}\",line=\"$decimal\",arch=\"$any\"\},frame=\{level=\"$decimal\",addr=\"$hex\",func=\"<function called from gdb>\"\},frame=\{level=\"$decimal\",addr=\"$hex\",func=\"main\",file=\".*mi-syn-frame.c\",fullname=\"${fullname_syntax}${srcfile}\",line=\"$decimal\",arch=\"$any\"\}.*\\\]" \
+    "407\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"subroutine\",file=\".*mi-syn-frame.c\",fullname=\"${fullname_syntax}${srcfile}\",line=\"$decimal\",arch=\"$any\"\},frame=\{level=\"1\",addr=\"$hex\",func=\"handler\",file=\".*mi-syn-frame.c\",fullname=\"${fullname_syntax}${srcfile}\",line=\"$decimal\",arch=\"$any\"\},frame=\{level=\"2\",addr=\"$hex\",func=\"<signal handler called>\"\},.*frame=\{level=\"$decimal\",addr=\"$hex\",(addr_flags=\"PAC\",)?func=\"have_a_very_merry_interrupt\",file=\".*mi-syn-frame.c\",fullname=\"${fullname_syntax}${srcfile}\",line=\"$decimal\",arch=\"$any\"\},frame=\{level=\"$decimal\",addr=\"$hex\",func=\"<function called from gdb>\"\},frame=\{level=\"$decimal\",addr=\"$hex\",func=\"main\",file=\".*mi-syn-frame.c\",fullname=\"${fullname_syntax}${srcfile}\",line=\"$decimal\",arch=\"$any\"\}.*\\\]" \
   "list stack frames, with signal handler and dummy frame"
 
 

gdb/testsuite/gdb.threads/pthread_cond_wait.exp

@@ -51,7 +51,7 @@ global decimal
 #
 # This is a "backtrace break" ("btb"):
 #
-set btb "\[^\r\n\]+\[\r\n\]+\#${decimal}\[ \t\]+${hex} in "
+set btb "\[^\r\n\]+\[\r\n\]+\#${decimal}\[ \t\]+${hex} (\\\[PAC\\\] )?in "
 
 # One of the threads is blocked on a call to pthread_cond_wait, and
 # we want to verify that we are able to get a sensible backtrace for

gdb/testsuite/gdb.threads/tls.exp

@@ -132,7 +132,7 @@ proc check_thread_stack {number spin_threads spin_threads_level} {
     }
     send_gdb "where\n"
     gdb_expect {
-	-re ".*(\[0-9\]+)\[ \t\]+$hex in spin \\(vp=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {
+	-re ".*(\[0-9\]+)\[ \t\]+$hex (\\\[PAC\\\] )?in spin \\(vp=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {
 	    if {[info exists tarr($number)]} {
 		fail "backtrace of thread number $number in spin"
 	    } else {