From: "mark at klomp dot org" <sourceware-bugzilla@sourceware.org>
To: debugedit@sourceware.org
Subject: [Bug debugedit/27636] Debugedit doesn't handle compressed debug ELF sections
Date: Mon, 11 Dec 2023 13:59:22 +0000 [thread overview]
Message-ID: <bug-27636-13298-5nI7CmRuNu@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-27636-13298@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=27636
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
commit 3e7aeeab4f744ad15108775685db68d3a35b0735
Author: Mark Wielaard <mark@klomp.org>
Date: Thu Mar 23 18:07:40 2023 +0100
debugedit: Add support for .debug_str_offsets (DW_FORM_strx)
In theory supporting strx .debug_str_offsets is easy, the strings in
.debug_str are just read through an indirection table. When the
strings are updated in .debug_str we just need to rewrite the
indirection table.
The tricky part is the ET_REL (object files or kernel modules)
support. Relocation reading is "global" per section and we expect to
read a relocation only once. But we need to read the
DW_AT_str_offsets_base before reading any strx form attributes. So we
read that first, then reset the relptr. And when we read from the
.debug_str_offsets section we need to save and restore the .debug_info
relptr.
* tools/debugedit.c (do_read_24): New function.
(str_offsets_base): New static variable.
(buf_read_ule24): New function.
(buf_read_ube24): Likewise.
(setup_relbuf): Handle .debug_str_offsets.
(do_read_uleb128): New function.
(do_read_str_form_relocated): Likewise.
(read_abbrev): Handle DW_FORM_strx[1234].
(edit_strp): Take the actual string form as argument.
Use do_read_str_form_relocated.
(read_dwarf5_line_entries): Pass form to edit_strp.
(edit_attributes_str_comp_dir): Take the actual string
form as argument. Use do_read_str_form_relocated.
(edit_attributes): Handle DW_FORM_strx[1234].
(edit_info): Read DW_AT_str_offsets_base first.
(update_str_offsets): New function.
(edit_dwarf2): Setup do_read_24. Call update_str_offsets.
https://sourceware.org/bugzilla/show_bug.cgi?id=28728
Signed-off-by: Mark Wielaard <mark@klomp.org>
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next prev parent reply other threads:[~2023-12-11 13:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-23 14:19 [Bug debugedit/27636] New: " mark at klomp dot org
2023-12-05 14:14 ` [Bug debugedit/27636] " mark at klomp dot org
2023-12-11 13:59 ` mark at klomp dot org [this message]
2023-12-11 14:01 ` mark at klomp dot org
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