From: Nick Desaulniers <ndesaulniers@google.com>
To: Masahiro Yamada <masahiroy@kernel.org>
Cc: Michal Marek <michal.lkml@markovi.net>,
Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
clang-built-linux <llvm@lists.linux.dev>,
Bill Wendling <morbo@google.com>,
Greg Thelen <gthelen@google.com>,
Alexey Alexandrov <aalexand@google.com>,
Nathan Chancellor <nathan@kernel.org>
Subject: Re: [PATCH v4] Makefile.debug: re-enable debug info for .S files
Date: Fri, 23 Sep 2022 19:20:03 -0700 [thread overview]
Message-ID: <CAKwvOdk-oj24MQs-W0Xs6p33f+Ei7Wu3wwCX+d34T=xoOPxOiw@mail.gmail.com> (raw)
In-Reply-To: <CAK7LNAS5xSQTjDuu+dsNW2fOz1-s7x0gsCLmfQOnGpb5CY06KA@mail.gmail.com>
On Fri, Sep 23, 2022 at 7:12 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> This patch still misses the debug info for *.S files
> for the combination of LLVM_IAS=0 and
> CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
> because, as the comment says, Clang does not pass -g down to GAS.
>
>
> With "[v4] Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO_SPLIT"
> and this one applied,
>
>
>
> $ grep CONFIG_DEBUG_INFO_DWARF .config
> CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
> # CONFIG_DEBUG_INFO_DWARF4 is not set
> # CONFIG_DEBUG_INFO_DWARF5 is not set
> $ make LLVM=1 LLVM_IAS=0 arch/x86/kernel/irqflags.o
> SYNC include/config/auto.conf.cmd
> SYSHDR arch/x86/include/generated/asm/unistd_32_ia32.h
> SYSHDR arch/x86/include/generated/asm/unistd_64_x32.h
> SYSTBL arch/x86/include/generated/asm/syscalls_64.h
> HOSTCC arch/x86/tools/relocs_32.o
> [snip]
> AS arch/x86/kernel/irqflags.o
> $ objdump -h arch/x86/kernel/irqflags.o | grep debug
> $
>
>
>
>
>
>
>
>
> I think the following fix-up is needed on top.
>
>
>
>
> diff --git a/scripts/Makefile.debug b/scripts/Makefile.debug
> index d6aecd78b942..8cf1cb22dd93 100644
> --- a/scripts/Makefile.debug
> +++ b/scripts/Makefile.debug
> @@ -1,4 +1,5 @@
> -DEBUG_CFLAGS := -g
> +DEBUG_CFLAGS :=
> +debug-flags-y := -g
>
> ifdef CONFIG_DEBUG_INFO_SPLIT
> DEBUG_CFLAGS += -gsplit-dwarf
>
>
>
>
> Then, I can see the debug sections.
>
>
>
> $ make LLVM=1 LLVM_IAS=0 arch/x86/kernel/irqflags.o
> CALL scripts/checksyscalls.sh
> DESCEND objtool
> AS arch/x86/kernel/irqflags.o
> $ objdump -h arch/x86/kernel/irqflags.o | grep debug
> 6 .debug_line 00000050 0000000000000000 0000000000000000 0000008f 2**0
> 7 .debug_info 0000002e 0000000000000000 0000000000000000 000000f8 2**0
> 8 .debug_abbrev 00000014 0000000000000000 0000000000000000 000001d0 2**0
> 9 .debug_aranges 00000030 0000000000000000 0000000000000000 000001f0 2**4
> 10 .debug_str 0000004d 0000000000000000 0000000000000000 00000250 2**0
>
>
>
>
>
> If you agree, I can locally fix it up as such.
Ah, sorry I missed testing that combination. Thanks for your
thoroughness. Yes please apply that diff on top.
--
Thanks,
~Nick Desaulniers
next prev parent reply other threads:[~2022-09-24 2:20 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-07 4:59 [PATCH v3 0/5] fix debug info for asm and DEBUG_INFO_SPLIT Nick Desaulniers
2022-09-07 4:59 ` [PATCH v3 1/5] x86/boot/compressed: prefer cc-option for CFLAGS additions Nick Desaulniers
2022-09-09 21:05 ` Masahiro Yamada
2022-09-07 4:59 ` [PATCH v3 2/5] Makefile.compiler: Use KBUILD_AFLAGS for as-option Nick Desaulniers
2022-09-09 21:06 ` Masahiro Yamada
2022-09-07 4:59 ` [PATCH v3 3/5] Makefile.compiler: replace cc-ifversion with compiler-specific macros Nick Desaulniers
2022-09-09 21:59 ` Masahiro Yamada
2022-09-07 4:59 ` [PATCH v3 4/5] Makefile.debug: re-enable debug info for .S files Nick Desaulniers
2022-09-07 4:59 ` [PATCH v3 5/5] Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO_SPLIT Nick Desaulniers
2022-09-09 20:56 ` Masahiro Yamada
2022-09-09 21:02 ` Masahiro Yamada
2022-09-19 17:08 ` [PATCH v4] Makefile.compiler: replace cc-ifversion with compiler-specific macros Nick Desaulniers
2022-09-23 19:44 ` Masahiro Yamada
2022-09-24 14:28 ` Masahiro Yamada
2022-09-25 1:22 ` Masahiro Yamada
2022-09-26 21:41 ` Nick Desaulniers
2023-04-27 11:53 ` Shreeya Patel
2023-04-28 7:41 ` Thorsten Leemhuis
2023-05-02 9:48 ` Shreeya Patel
2023-05-02 11:58 ` Linux regression tracking (Thorsten Leemhuis)
2023-04-28 17:27 ` Nick Desaulniers
2023-05-03 21:02 ` Shreeya Patel
2023-05-03 21:15 ` Nick Desaulniers
2023-05-03 22:33 ` Shreeya Patel
2023-05-15 23:01 ` Nick Desaulniers
2023-05-17 8:34 ` Shreeya Patel
2023-05-17 15:39 ` Ricardo Cañuelo
2023-05-17 16:27 ` Nick Desaulniers
2023-05-18 14:23 ` Ricardo Cañuelo
2023-05-18 21:12 ` Nick Desaulniers
2023-05-19 8:35 ` Ricardo Cañuelo
2023-05-19 15:57 ` Nick Desaulniers
2023-05-22 10:09 ` Ricardo Cañuelo
2023-05-22 16:52 ` Greg KH
2023-05-22 19:52 ` Nick Desaulniers
2023-05-22 20:01 ` Greg KH
2023-05-22 20:16 ` Nick Desaulniers
2023-05-23 10:27 ` Shreeya Patel
2023-05-23 21:27 ` Nick Desaulniers
2023-06-12 10:10 ` Shreeya Patel
2023-06-20 4:19 ` Masahiro Yamada
2023-07-10 12:09 ` Linux regression tracking (Thorsten Leemhuis)
2023-07-11 11:16 ` Shreeya Patel
2023-08-29 11:28 ` Linux regression tracking (Thorsten Leemhuis)
2023-09-11 10:05 ` Thorsten Leemhuis
2023-09-15 9:33 ` Shreeya Patel
2023-09-30 10:24 ` Masahiro Yamada
2022-09-19 17:30 ` [PATCH v4] Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO_SPLIT Nick Desaulniers
2022-09-24 1:34 ` Masahiro Yamada
2022-09-19 17:45 ` [PATCH v4] Makefile.debug: re-enable debug info for .S files Nick Desaulniers
2022-09-24 2:11 ` Masahiro Yamada
2022-09-24 2:20 ` Nick Desaulniers [this message]
2022-09-24 6:43 ` Masahiro Yamada
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