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binutils: reproducibility: reuse debug-prefix-map for stabs

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powerpc 32bit Linux Kernel widely uses .stabs pseudo-op to
produce debugging information in stabs format. Faced an issue
that during Linux Kernel build with Yocto build system for 32bit
powerpc platform resulting vmlinux contains absolute path in
.stabstr section that cannot be remapped with -fdebug-prefix-map
option.

Yocto uses scripts/mkmakefile Linux Kernel build approach that
allows to store all generated files outside of kernel source
tree. With this approach each compilier invocation is performed
with an absolute path to a file that will be compiled and this
absolute path is recorded in init stab. There is no way to remap
this path.

Reuse remap_debug_filename api to make -fdebug-prefix-map flag
aplicable for init stab.

(From OE-Core rev: b4b79870d7946e58692adb68d1329955500d3c56)

Signed-off-by: Denys Zagorui <dzagorui@cisco.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 4dce4e01cfa153fb12cfd1684d36e0432bef6741)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Denys Zagorui
2020-11-10 18:14:12 +00:00
committed by Richard Purdie
parent 010625f35a
commit b74901b816
2 changed files with 36 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
meta/recipes-devtools/binutils/binutils-2.35.inc
View File

@@ -41,5 +41,6 @@ SRC_URI = "\
file://0014-Fix-rpath-in-libtool-when-sysroot-is-enabled.patch \
file://0015-sync-with-OE-libtool-changes.patch \
file://0016-Check-for-clang-before-checking-gcc-version.patch \
file://0017-gas-improve-reproducibility-for-stabs-debugging-data.patch \
"
S = "${WORKDIR}/git"

35
meta/recipes-devtools/binutils/binutils/0017-gas-improve-reproducibility-for-stabs-debugging-data.patch Normal file
View File

@@ -0,0 +1,35 @@
From aa6586e80fc6fcd739aa959a71e4cf064cdef072 Mon Sep 17 00:00:00 2001
From: Denys Zagorui <dzagorui@cisco.com>
Date: Mon, 9 Nov 2020 15:39:10 +0000
Subject: [PATCH] gas: improve reproducibility for stabs debugging data format
* config/obj-elf (obj_elf_init_stab_section): Improve
reproducibility for stabs debugging data format
Upstream-Status: Backport [https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=0541201782c006c09d029d18a45c6e743cfea906]
---
gas/config/obj-elf.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/gas/config/obj-elf.c b/gas/config/obj-elf.c
index de22b5a1da..2025df8542 100644
--- a/gas/config/obj-elf.c
+++ b/gas/config/obj-elf.c
@@ -2374,12 +2374,13 @@ obj_elf_init_stab_section (segT seg)
p = frag_more (12);
/* Zero it out. */
memset (p, 0, 12);
- file = as_where (NULL);
+ file = remap_debug_filename (as_where (NULL));
stabstr_name = concat (segment_name (seg), "str", (char *) NULL);
stroff = get_stab_string_offset (file, stabstr_name, TRUE);
know (stroff == 1 || (stroff == 0 && file[0] == '\0'));
md_number_to_chars (p, stroff, 4);
seg_info (seg)->stabu.p = p;
+ xfree ((char *) file);
}
#endif
--
2.20.1