This is a note to let you know that I've just added the patch titled
lib/Kconfig.debug: Add check for non-constant .{s,u}leb128 support to DWARF5
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
lib-kconfig.debug-add-check-for-non-constant-.-s-u-leb128-support-to-dwarf5.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Oct 18 08:47:40 AM CEST 2022
From: Nathan Chancellor <nathan@xxxxxxxxxx>
Date: Fri, 14 Oct 2022 13:42:11 -0700
Subject: lib/Kconfig.debug: Add check for non-constant .{s,u}leb128 support to DWARF5
From: Nathan Chancellor <nathan@xxxxxxxxxx>
commit 0a6de78cff600cb991f2a1b7ed376935871796a0 upstream.
When building with a RISC-V kernel with DWARF5 debug info using clang
and the GNU assembler, several instances of the following error appear:
/tmp/vgettimeofday-48aa35.s:2963: Error: non-constant .uleb128 is not supported
Dumping the .s file reveals these .uleb128 directives come from
.debug_loc and .debug_ranges:
.Ldebug_loc0:
.byte 4 # DW_LLE_offset_pair
.uleb128 .Lfunc_begin0-.Lfunc_begin0 # starting offset
.uleb128 .Ltmp1-.Lfunc_begin0 # ending offset
.byte 1 # Loc expr size
.byte 90 # DW_OP_reg10
.byte 0 # DW_LLE_end_of_list
.Ldebug_ranges0:
.byte 4 # DW_RLE_offset_pair
.uleb128 .Ltmp6-.Lfunc_begin0 # starting offset
.uleb128 .Ltmp27-.Lfunc_begin0 # ending offset
.byte 4 # DW_RLE_offset_pair
.uleb128 .Ltmp28-.Lfunc_begin0 # starting offset
.uleb128 .Ltmp30-.Lfunc_begin0 # ending offset
.byte 0 # DW_RLE_end_of_list
There is an outstanding binutils issue to support a non-constant operand
to .sleb128 and .uleb128 in GAS for RISC-V but there does not appear to
be any movement on it, due to concerns over how it would work with
linker relaxation.
To avoid these build errors, prevent DWARF5 from being selected when
using clang and an assembler that does not have support for these symbol
deltas, which can be easily checked in Kconfig with as-instr plus the
small test program from the dwz test suite from the binutils issue.
Link: https://sourceware.org/bugzilla/show_bug.cgi?id=27215
Link: https://github.com/ClangBuiltLinux/linux/issues/1719
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
[nathan: Fix conflicts due to lack of f9b3cd24578401e]
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig.debug | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -208,6 +208,11 @@ config DEBUG_BUGVERBOSE
endmenu # "printk and dmesg options"
+# Clang is known to generate .{s,u}leb128 with symbol deltas with DWARF5, which
+# some targets may not support: https://sourceware.org/bugzilla/show_bug.cgi?id=27215
+config AS_HAS_NON_CONST_LEB128
+ def_bool $(as-instr,.uleb128 .Lexpr_end4 - .Lexpr_start3\n.Lexpr_start3:\n.Lexpr_end4:)
+
menu "Compile-time checks and compiler options"
config DEBUG_INFO
@@ -274,7 +279,7 @@ choice
config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
bool "Rely on the toolchain's implicit default DWARF version"
- depends on !CC_IS_CLANG || AS_IS_LLVM || CLANG_VERSION < 140000 || (AS_IS_GNU && AS_VERSION >= 23502)
+ depends on !CC_IS_CLANG || AS_IS_LLVM || CLANG_VERSION < 140000 || (AS_IS_GNU && AS_VERSION >= 23502 && AS_HAS_NON_CONST_LEB128)
help
The implicit default version of DWARF debug info produced by a
toolchain changes over time.
@@ -296,7 +301,7 @@ config DEBUG_INFO_DWARF4
config DEBUG_INFO_DWARF5
bool "Generate DWARF Version 5 debuginfo"
- depends on !CC_IS_CLANG || AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)
+ depends on !CC_IS_CLANG || AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502 && AS_HAS_NON_CONST_LEB128)
depends on !DEBUG_INFO_BTF
help
Generate DWARF v5 debug info. Requires binutils 2.35.2, gcc 5.0+ (gcc
Patches currently in stable-queue which might be from nathan@xxxxxxxxxx are
queue-5.15/mips-bcm47xx-cast-memcmp-of-function-to-void.patch
queue-5.15/lib-kconfig.debug-add-check-for-non-constant-.-s-u-leb128-support-to-dwarf5.patch
queue-5.15/kconfig.debug-simplify-the-dependency-of-debug_info_dwarf4-5.patch
queue-5.15/kconfig.debug-add-toolchain-checks-for-debug_info_dwarf_toolchain_default.patch
queue-5.15/net-ethernet-litex-fix-return-type-of-liteeth_start_.patch
queue-5.15/net-korina-fix-return-type-of-korina_send_packet.patch
queue-5.15/net-davicom-fix-return-type-of-dm9000_start_xmit.patch
queue-5.15/drm-amd-display-fix-build-breakage-with-config_debug_fs-n.patch
queue-5.15/hardening-avoid-harmless-clang-option-under-config_init_stack_all_zero.patch
queue-5.15/net-ethernet-ti-davinci_emac-fix-return-type-of-emac.patch
queue-5.15/riscv-pass-mno-relax-only-on-lld-15.0.0.patch
queue-5.15/hardening-remove-clang-s-enable-flag-for-ftrivial-auto-var-init-zero.patch
queue-5.15/powerpc-math_emu-efp-include-module.h.patch
