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gdb/SOURCES/gdb-rhbz2086761-unknown-cfa...

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From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
From: Keith Seitz <keiths@redhat.com>
Date: Tue, 24 May 2022 07:39:17 -0700
Subject: gdb-rhbz2086761-unknown-cfa-rule.patch
;; Backport "fix logic of find_comp_unit and set_comp_unit"
;; (Simon Marchi, RHBZ 2086761)
The logic in find_comp_unit and set_comp_unit is reversed. When the BFD
requires relocation, we want to put the comp_unit structure in the
map where the comp_unit objects are not shared, that is the one indexed
by objfile. If the BFD does not require relocation, then, we can share
a single comp_unit structure for all users of that BFD, so we want to
put it in the BFD-indexed map. The comments on top of
dwarf2_frame_bfd_data and dwarf2_frame_objfile_data make that clear.
Fix it by swapping the two in find_comp_unit and set_comp_unit.
I don't have a test for this, because I don't see how to write one in a
reasonable amount of time.
gdb/ChangeLog:
PR gdb/26876
* dwarf2/frame.c (find_comp_unit, set_comp_unit): Reverse use of
dwarf2_frame_bfd_data and dwarf2_frame_objfile_data.
diff --git a/gdb/dwarf2/frame.c b/gdb/dwarf2/frame.c
--- a/gdb/dwarf2/frame.c
+++ b/gdb/dwarf2/frame.c
@@ -1640,8 +1640,9 @@ find_comp_unit (struct objfile *objfile)
{
bfd *abfd = objfile->obfd;
if (gdb_bfd_requires_relocations (abfd))
- return dwarf2_frame_bfd_data.get (abfd);
- return dwarf2_frame_objfile_data.get (objfile);
+ return dwarf2_frame_objfile_data.get (objfile);
+
+ return dwarf2_frame_bfd_data.get (abfd);
}
/* Store the comp_unit on OBJFILE, or the corresponding BFD, as
@@ -1652,8 +1653,9 @@ set_comp_unit (struct objfile *objfile, struct comp_unit *unit)
{
bfd *abfd = objfile->obfd;
if (gdb_bfd_requires_relocations (abfd))
- return dwarf2_frame_bfd_data.set (abfd, unit);
- return dwarf2_frame_objfile_data.set (objfile, unit);
+ return dwarf2_frame_objfile_data.set (objfile, unit);
+
+ return dwarf2_frame_bfd_data.set (abfd, unit);
}
/* Find the FDE for *PC. Return a pointer to the FDE, and store the