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tools/elfutils: add missing MIPS reloc support

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Backport an upstream patch series that adds backend elfutils support for
DWARF relocations in MIPS debug info. This support is needed by pahole to
generate BTF for modules in BTF-enabled kernel builds.

The problem first manifests as pahole warnings during build:

    BTF [M] lib/libcrc32c.ko
    die__process_unit: DW_TAG_compile_unit (0x11) @ <0x932d> not handled!
    die__process_unit: tag not supported 0x11 (compile_unit)!
    die__process: got compile_unit unexpected tag after DW_TAG_compile_unit!
    die__process_unit: DW_TAG_compile_unit (0x11) @ <0x99a3> not handled!
    die__process_unit: tag not supported 0x11 (compile_unit)!
    die__process: got compile_unit unexpected tag after DW_TAG_compile_unit!

During system boot the problem then causes module loading failures, which
may result in many other runtime issues:

    [   13.169785] kmodloader: loading kernel modules from /etc/modules.d/*
    [ ... ]
    [   17.422840] mac80211_hwsim: initializing netlink
    [   17.526518] PPP generic driver version 2.4.2
    [   17.550346] NET: Registered PF_PPPOX protocol family
    [   17.795353] kmodloader: 26 modules could not be probed
    [   17.796084] kmodloader: dependency not loaded nf_conntrack
    [   17.796737] kmodloader: - act_connmark - 1
    [   17.797402] kmodloader: dependency not loaded nf_conntrack
    [   17.798056] kmodloader: - act_ctinfo - 1
    [ ... ]

Link: https://lore.kernel.org/bpf/ZlkoM6%2FPSxVcGM6X@kodidev-ubuntu/
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
Link: https://github.com/openwrt/openwrt/pull/15697
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
This commit is contained in:
Tony Ambardar 2024-06-09 23:59:12 -07:00 committed by Christian Marangi
parent cc6a1e2abc
commit f97da2c61a
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GPG Key ID: AC001D09ADBFEAD7
2 changed files with 2534 additions and 9 deletions
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2525
tools/elfutils/patches/010-backport-mips-support-reloc.patch Normal file
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File diff suppressed because it is too large Load Diff

18
tools/elfutils/patches/100-portability.patch
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@ -565,10 +565,10 @@
+noinst_LTLIBRARIES = libebl_backends.la
modules = i386 sh x86_64 ia64 alpha arm aarch64 sparc ppc ppc64 s390 \
m68k bpf riscv csky loongarch arc
@@ -102,17 +102,13 @@ loongarch_SRCS = loongarch_init.c loonga
arc_SRCS = arc_init.c arc_symbol.c
m68k bpf riscv csky loongarch arc mips
@@ -106,17 +106,13 @@ mips_SRCS = mips_init.c mips_symbol.c mi
mips_cfi.c mips_unwind.c mips_regs.c mips_retval.c \
mips_corenote.c mips64_corenote.c
-libebl_backends_a_SOURCES = $(i386_SRCS) $(sh_SRCS) $(x86_64_SRCS) \
+libebl_backends_la_SOURCES = $(i386_SRCS) $(sh_SRCS) $(x86_64_SRCS) \
@ -576,7 +576,7 @@
$(aarch64_SRCS) $(sparc_SRCS) $(ppc_SRCS) \
$(ppc64_SRCS) $(s390_SRCS) \
$(m68k_SRCS) $(bpf_SRCS) $(riscv_SRCS) $(csky_SRCS) \
$(loongarch_SRCS) $(arc_SRCS)
$(loongarch_SRCS) $(arc_SRCS) $(mips_SRCS)
-libebl_backends_pic_a_SOURCES =
-am_libebl_backends_pic_a_OBJECTS = $(libebl_backends_a_SOURCES:.c=.os)
@ -806,7 +806,7 @@
elfcompress_LDADD = $(libebl) $(libelf) $(libdw) $(libeu) $(argp_LDADD)
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -689,17 +689,11 @@ installcheck-local:
@@ -690,17 +690,11 @@ installcheck-local:
TESTS_ENVIRONMENT="$(installed_TESTS_ENVIRONMENT)" \
LOG_COMPILER="$(installed_LOG_COMPILER)" check-TESTS
@ -900,7 +900,7 @@
--- a/libebl/eblopenbackend.c
+++ b/libebl/eblopenbackend.c
@@ -198,8 +198,6 @@ static bool default_object_note (const c
@@ -200,8 +200,6 @@ static bool default_object_note (const c
uint32_t descsz, const char *desc);
static bool default_debugscn_p (const char *name);
static bool default_copy_reloc_p (int reloc);
@ -909,7 +909,7 @@
static bool default_check_special_symbol (Elf *elf,
const GElf_Sym *sym,
const char *name,
@@ -251,8 +249,8 @@ fill_defaults (Ebl *result)
@@ -253,8 +251,8 @@ fill_defaults (Ebl *result)
result->object_note = default_object_note;
result->debugscn_p = default_debugscn_p;
result->copy_reloc_p = default_copy_reloc_p;
@ -920,7 +920,7 @@
result->check_special_symbol = default_check_special_symbol;
result->data_marker_symbol = default_data_marker_symbol;
result->check_st_other_bits = default_check_st_other_bits;
@@ -634,8 +632,6 @@ default_copy_reloc_p (int reloc __attrib
@@ -636,8 +634,6 @@ default_copy_reloc_p (int reloc __attrib
{
return false;
}