[binutils-gdb] [gdb/testsuite] Fix gdb.dwarf2/dw2-entry-points.exp on ppc64le

[binutils-gdb] [gdb/testsuite] Fix gdb.dwarf2/dw2-entry-points.exp on ppc64le

[Tom de Vries]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=fa87f8e1958b8937047e3d5fcfd8c265745710ae

commit fa87f8e1958b8937047e3d5fcfd8c265745710ae
Author: Tom de Vries <tdevries@suse.de>
Date:   Thu Jan 11 16:05:12 2024 +0100

    [gdb/testsuite] Fix gdb.dwarf2/dw2-entry-points.exp on ppc64le
    
    On ppc64le-linux, I run into:
    ...
    (gdb) bt^M
     #0  0x00000000100006dc in foobar (J=2)^M
     #1  0x000000001000070c in prog ()^M
    (gdb) FAIL: gdb.dwarf2/dw2-entry-points.exp: bt foo
    ...
    
    The test-case attemps to emulate additional entry points of a function, with
    function bar having entry points foo and foobar:
    ...
    (gdb) p bar
    $1 = {void (int, int)} 0x1000064c <bar>
    (gdb) p foo
    $2 = {void (int, int)} 0x10000698 <foo>
    (gdb) p foobar
    $3 = {void (int)} 0x100006d0 <foobar>
    ...
    
    However, when setting a breakpoint on the entry point foo:
    ...
    (gdb) b foo
    Breakpoint 1 at 0x100006dc
    ...
    it ends up in foobar instead of in foo, due to prologue skipping, and
    consequently the backtrace show foobar instead foo.
    
    The problem is that the test-case does not emulate an actual prologue at each
    entry point.
    
    Fix this by disabling the prologue skipping when setting a breakpoint, using
    "break *foo".
    
    Tested on ppc64le-linux and x86_64-linux.
    
    Tested-By: Guinevere Larsen <blarsen@redhat.com>
    Approved-By: Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
    
    PR testsuite/31232
    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31232

Diff:
---
 gdb/testsuite/gdb.dwarf2/dw2-entry-points.exp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/gdb/testsuite/gdb.dwarf2/dw2-entry-points.exp b/gdb/testsuite/gdb.dwarf2/dw2-entry-points.exp
index f361820f72f..035b15ee087 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-entry-points.exp
+++ b/gdb/testsuite/gdb.dwarf2/dw2-entry-points.exp
@@ -180,8 +180,8 @@ if ![runto_main] {
 }
 
 # Try whether we can set and hit breakpoints at the entry_points.
-gdb_breakpoint "foo"
-gdb_breakpoint "foobar"
+gdb_breakpoint "*foo"
+gdb_breakpoint "*foobar"
 
 # Now hit the entry_point break point and check their call-stack.
 gdb_continue_to_breakpoint "foo"
@@ -204,7 +204,7 @@ if ![runto_main] {
     return -1
 }
 
-gdb_breakpoint "fooso"
+gdb_breakpoint "*fooso"
 gdb_continue_to_breakpoint "foo_so"
 
 gdb_test "bt" [multi_line \