[PATCH] PowerPC: fix for gdb.base/eh_return.exp

[Carl Love <cel@us.ibm.com>]

GDB maintainers:

The following patch fixes a test failure on PowerPC.  The test needs to
determing the last instruction in function e2.  The current parsing to
get the last instruction doesn't work on PowerPC as there are three
additional .long statements after the last instruction.

This patch adds an entry to the gdb_test_multiple statement to parse
the PowerPC assembly code to get the address. 

The patch has been tested on PowerPC and Intel with no regression
failures.  Please let me know if this patch is acceptable.  Thanks.

                                  Carl Love
----------------------------------------------
PowerPC: fix for gdb.base/eh_return.exp

The expect file does a disassembly of function eh2 to get the address of
the last instruction of function eh2.  The last instruction on PowerPC is
followed by three .long entries.  This requires a different pattern
matching for PowerPC versus other architectures.

This patch adds the needed gdb_test_multiple match statement for the
PowerPC disassembly code.

This patch fixes the one test failure on PowerPC.

The patch has been tested on Power 10 and Intel 64.
---
 gdb/testsuite/gdb.base/eh_return.exp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/gdb/testsuite/gdb.base/eh_return.exp b/gdb/testsuite/gdb.base/eh_return.exp
index df55dbc72da..ce46a3623d9 100644
--- a/gdb/testsuite/gdb.base/eh_return.exp
+++ b/gdb/testsuite/gdb.base/eh_return.exp
@@ -27,6 +27,22 @@ set address -1
 
 # Get the address of the last insn in function eh2.
 gdb_test_multiple "disassemble eh2" "" {
+    -re "($hex)\[^\r\n\]*blr.*" {
+	# The dissassebmly on Powerpc looks like:
+	#   Dump of assembler code for function eh2:
+	#   0x00000000100009e0 <+0>:     lis     r2,4098
+	#   ...
+	#   0x0000000010000b04 <+292>:   add     r1,r1,r10
+	#   0x0000000010000b08 <+296>:   blr
+	#   0x0000000010000b0c <+300>:   .long 0x0
+	#   0x0000000010000b10 <+304>:   .long 0x1000000
+	#   0x0000000010000b14 <+308>:   .long 0x1000180
+	#   End of assembler dump.
+	#
+	#  Powerpc needs the address for the blr instruction above.
+	set address $expect_out(1,string)
+	pass $gdb_test_name
+    }
     -re -wrap "($hex)\[^\r\n\]*\r\nEnd of assembler dump." {
 	set address $expect_out(1,string)
 	pass $gdb_test_name
-- 
2.31.1