[binutils-gdb] Powerpc fix for gdb.base/unwind-on-each-insn.exp

[Carl Love <carll@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=91836f41e209a60a8a836faef2e7889e144df297

commit 91836f41e209a60a8a836faef2e7889e144df297
Author: Carl Love <cel@us.ibm.com>
Date:   Fri Nov 4 12:06:37 2022 -0400

    Powerpc fix for gdb.base/unwind-on-each-insn.exp
    
    The test disassembles function foo and searches for the line
    "End of assembler dump" to determing the last address in the function.  The
    assumption is the last instruction will be given right before the line
    "End of assembler dump".  This assumption fails on PowerPC.
    
    The PowerPC disassembly of the function foo looks like:
     Dump of assembler code for function foo:
    #  => 0x00000000100006dc <+0>:     std     r31,-8(r1)
    #     0x00000000100006e0 <+4>:     stdu    r1,-48(r1)
    #     0x00000000100006e4 <+8>:     mr      r31,r1
    #     0x00000000100006e8 <+12>:    nop
    #     0x00000000100006ec <+16>:    addi    r1,r31,48
    #     0x00000000100006f0 <+20>:    ld      r31,-8(r1)
    #     0x00000000100006f4 <+24>:    blr
    #     0x00000000100006f8 <+28>:    .long 0x0
    #     0x00000000100006fc <+32>:    .long 0x0
    #     0x0000000010000700 <+36>:    .long 0x1000180
    #     End of assembler dump.
    
    The blr instruction is the last instruction in function foo.  The lines
    with .long following the blr instruction need to be ignored.
    
    This patch adds a new condition to the gdb_test_multiple "disassemble foo"
    test to ignore the lines with the .long.
    
    The patch has been tested on PowerPC and Intel X86-64.

Diff:
---
 gdb/testsuite/gdb.base/unwind-on-each-insn.exp | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/gdb/testsuite/gdb.base/unwind-on-each-insn.exp b/gdb/testsuite/gdb.base/unwind-on-each-insn.exp
index 3b48805cff8..d8863ad2895 100644
--- a/gdb/testsuite/gdb.base/unwind-on-each-insn.exp
+++ b/gdb/testsuite/gdb.base/unwind-on-each-insn.exp
@@ -75,6 +75,24 @@ gdb_continue_to_breakpoint "enter foo"
 
 # Figure out the range of addresses covered by this function.
 set last_addr_in_foo ""
+
+# The disassembly of foo on PowerPC looks like:
+#     Dump of assembler code for function foo:
+#  => 0x00000000100006dc <+0>:     std     r31,-8(r1)
+#     0x00000000100006e0 <+4>:     stdu    r1,-48(r1)
+#     0x00000000100006e4 <+8>:     mr      r31,r1
+#     0x00000000100006e8 <+12>:    nop
+#     0x00000000100006ec <+16>:    addi    r1,r31,48
+#     0x00000000100006f0 <+20>:    ld      r31,-8(r1)
+#     0x00000000100006f4 <+24>:    blr
+#     0x00000000100006f8 <+28>:    .long 0x0
+#     0x00000000100006fc <+32>:    .long 0x0
+#     0x0000000010000700 <+36>:    .long 0x1000180
+#     End of assembler dump.
+#
+# The last instruction in function foo is blr.  Need to ignore the .long
+# entries following the blr instruction.
+
 gdb_test_multiple "disassemble foo" "" {
     -re "^disassemble foo\r\n" {
 	exp_continue
@@ -84,6 +102,10 @@ gdb_test_multiple "disassemble foo" "" {
 	exp_continue
     }
 
+    -re "^...($hex) \[<>+0-9:\s\t\]*\.long\[\s\t\]*\[^\r\n\]*\r\n" {
+	exp_continue
+    }
+
     -re "^...($hex) \[^\r\n\]+\r\n" {
 	set last_addr_in_foo $expect_out(1,string)
 	exp_continue