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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: b90799fd0f38cd013bebadbe5b9c50b4f93e84af)

Signed-off-by: Denys Zagorui <dzagorui@cisco.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Denys Zagorui
2020-11-11 11:03:10 +00:00
committed by Richard Purdie
parent 8148892fee
commit a48175131e
2 changed files with 33 additions and 0 deletions
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1
meta/recipes-devtools/binutils/binutils-2.34.inc
View File

@@ -43,5 +43,6 @@ SRC_URI = "\
file://0016-Check-for-clang-before-checking-gcc-version.patch \
file://0017-binutils-drop-redundant-program_name-definition-fno-.patch \
file://CVE-2020-0551.patch \
file://0001-gas-improve-reproducibility-for-stabs-debugging-data.patch \
"
S = "${WORKDIR}/git"

32
meta/recipes-devtools/binutils/binutils/0001-gas-improve-reproducibility-for-stabs-debugging-data.patch Normal file
View File

@@ -0,0 +1,32 @@
From 96882eb9263b6b1c953e33a6764a83f4a87a9a41 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 7cf921c051..92b55e06c2 100644
--- a/gas/config/obj-elf.c
+++ b/gas/config/obj-elf.c
@@ -2186,12 +2186,13 @@ 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