linux-kernel - Re: [PATCH] efi/libstub: Fix build error with libstub

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Date:   Wed, 10 Jun 2020 11:10:27 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Zhenzhong Duan <zhenzhong.duan@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Kees Cook <keescook@...omium.org>,
        Ingo Molnar <mingo@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] efi/libstub: Fix build error with libstub

On Wed, 10 Jun 2020 at 10:59, Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> On Wed, Jun 10, 2020 at 03:14:46PM +0800, Zhenzhong Duan wrote:
> > Got below error during build:
> >
> >   In file included from drivers/firmware/efi/libstub/efi-stub-helper.c:16:0:
> >   drivers/firmware/efi/libstub/efi-stub-helper.c: In function ‘efi_char16_puts’:
> >   arch/x86/include/asm/efi.h:355:3: sorry, unimplemented: ms_abi attribute requires -maccumulate-outgoing-args or subtarget optimization implying it
> >      : __efi64_thunk_map(inst, func, inst, ##__VA_ARGS__))
> >      ^
> >   drivers/firmware/efi/libstub/efi-stub-helper.c:37:2: note: in expansion of macro ‘efi_call_proto’
> >     efi_call_proto(efi_table_attr(efi_system_table, con_out),
> >     ^
> >   drivers/firmware/efi/libstub/efi-stub-helper.c:37: confused by earlier errors, bailing out
> >
> > Fix it by adding -maccumulate-outgoing-args for efi libstub build
> > as suggested by gcc.
> >
> > Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...il.com>
> > ---
> >  drivers/firmware/efi/libstub/Makefile | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
> > index cce4a74..25e5d02 100644
> > --- a/drivers/firmware/efi/libstub/Makefile
> > +++ b/drivers/firmware/efi/libstub/Makefile
> > @@ -6,7 +6,7 @@
> >  # enabled, even if doing so doesn't break the build.
> >  #
> >  cflags-$(CONFIG_X86_32)              := -march=i386
> > -cflags-$(CONFIG_X86_64)              := -mcmodel=small
> > +cflags-$(CONFIG_X86_64)              := -mcmodel=small -maccumulate-outgoing-args
>
> This will need a cc-option call if this patch is necessary because clang
> does not support this flag.
>
> clang-11: error: unknown argument: '-maccumulate-outgoing-args'
>

A fix was already sent for this

https://lore.kernel.org/bpf/20200605150638.1011637-1-nivedita@alum.mit.edu/

which does the right thing here.

> >  cflags-$(CONFIG_X86)         += -m$(BITS) -D__KERNEL__ \
> >                                  -fPIC -fno-strict-aliasing -mno-red-zone \
> >                                  -mno-mmx -mno-sse -fshort-wchar \
> > --
> > 1.8.3.1
> >
>
> Cheers,
> Nathan