[committed][gdb/testsuite] Fix gdb.dwarf2/dw2-out-of-range-end-of-seq.exp on aarch64

[Tom de Vries via Gdb-patches <gdb-patches@sourceware.org>]

Hi,

On aarch64-linux, with test-case gdb.dwarf2/dw2-out-of-range-end-of-seq.exp I
run into:
...
(gdb) run ^M
Starting program: dw2-out-of-range-end-of-seq ^M
^M
Program received signal SIGILL, Illegal instruction.^M
main () at src/gdb/testsuite/gdb.dwarf2/main.c:1^M
1       /* This testcase is part of GDB, the GNU debugger.^M
(gdb) FAIL: gdb.dwarf2/dw2-out-of-range-end-of-seq.exp: runto: run to main
...

There are two problems here:
- the test-case contains a hardcoded "DW_LNS_advance_pc 1" which causes the
  breakpoint pointing in the middle of an insn
- the FAIL triggers on aarch64-linux, but not on x86_64-linux, because the
  test-case uses 'main_label' as the address of the first and only valid entry
  in the line table, and:
  - on aarch64-linux, there's no prologue, so main_label and main coincide,
    while
  - on x86_64-linux, there's a prologue, so main_label is different from main.

Fix these problems by:
- eliminating the use of "DW_LNS_advance_pc 1", and using
  "DW_LNE_set_address $main_end" instead, and
- eliminating the use of main_label, using "DW_LNE_set_address $main_start"
  instead.

Tested on both x86_64-linux and aarch64-linux.

Committed to trunk.

Thanks,
- Tom

[gdb/testsuite] Fix gdb.dwarf2/dw2-out-of-range-end-of-seq.exp on aarch64

---
 gdb/testsuite/gdb.dwarf2/dw2-out-of-range-end-of-seq.exp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/gdb/testsuite/gdb.dwarf2/dw2-out-of-range-end-of-seq.exp b/gdb/testsuite/gdb.dwarf2/dw2-out-of-range-end-of-seq.exp
index b8da03ddb3d..f030e1edc1f 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-out-of-range-end-of-seq.exp
+++ b/gdb/testsuite/gdb.dwarf2/dw2-out-of-range-end-of-seq.exp
@@ -35,10 +35,16 @@ if !$gcc_compiled {
 
 standard_testfile main.c -dw.S
 
+set func_info_vars [get_func_info main]
+
 set asm_file [standard_output_file $srcfile2]
 Dwarf::assemble $asm_file {
     declare_labels Llines
     global srcdir subdir srcfile
+    global func_info_vars
+    foreach var $func_info_vars {
+	global $var
+    }
 
     cu {} {
 	compile_unit {
@@ -48,7 +54,9 @@ Dwarf::assemble $asm_file {
 	} {
 	    subprogram {
 		{external 1 flag}
-		{MACRO_AT_func {main}}
+		{name main}
+		{low_pc $main_start}
+		{high_pc $main_end addr}
 	    }
 	}
     }
@@ -58,11 +66,11 @@ Dwarf::assemble $asm_file {
 	file_name "$srcfile" 1
 
 	program {
-	    DW_LNE_set_address main_label
+	    DW_LNE_set_address $main_start
 	    line 1
 	    DW_LNS_copy
 
-	    DW_LNS_advance_pc 1
+	    DW_LNE_set_address $main_end
 	    DW_LNE_end_sequence
 
 	    DW_LNE_set_address 0