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| author | Nick Desaulniers <ndesaulniers@google.com> | 2019-09-25 11:09:06 -0700 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2019-10-01 22:13:17 +0200 |
| commit | 6a181e333954a26f46596b36f82abd14743570fd (patch) | |
| tree | 072aaa985541327e62091acd8885e1bdaff06614 /arch/x86/realmode | |
| parent | 54ecb8f7028c5eb3d740bb82b0f1d90f2df63c5c (diff) | |
| download | linux-6a181e333954a26f46596b36f82abd14743570fd.tar.bz2 | |
x86/realmode: Explicitly set entry point via ENTRY in linker script
Linking with ld.lld via
$ make LD=ld.lld
produces the warning:
ld.lld: warning: cannot find entry symbol _start; defaulting to 0x1000
Linking with ld.bfd shows the default entry is 0x1000:
$ readelf -h arch/x86/realmode/rm/realmode.elf | grep Entry
Entry point address: 0x1000
While ld.lld is being pedantic, just set the entry point explicitly,
instead of depending on the implicit default. The symbol pa_text_start
refers to the start of the .text section, which may not be at 0x1000 if
the preceding sections listed in arch/x86/realmode/rm/realmode.lds.S
were large enough. This matches behavior in arch/x86/boot/setup.ld.
Reported-by: Sedat Dilek <sedat.dilek@gmail.com>
Suggested-by: Borislav Petkov <bp@alien8.de>
Suggested-by: Peter Smith <Peter.Smith@arm.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: clang-built-linux@googlegroups.com
Cc: grimar@accesssoftek.com
Cc: Ingo Molnar <mingo@redhat.com>
Cc: maskray@google.com
Cc: ruiu@google.com
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190925180908.54260-1-ndesaulniers@google.com
Link: https://github.com/ClangBuiltLinux/linux/issues/216
Diffstat (limited to 'arch/x86/realmode')
| -rw-r--r-- | arch/x86/realmode/rm/realmode.lds.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/realmode/rm/realmode.lds.S b/arch/x86/realmode/rm/realmode.lds.S index 3bb980800c58..64d135d1ee63 100644 --- a/arch/x86/realmode/rm/realmode.lds.S +++ b/arch/x86/realmode/rm/realmode.lds.S @@ -11,6 +11,7 @@ OUTPUT_FORMAT("elf32-i386") OUTPUT_ARCH(i386) +ENTRY(pa_text_start) SECTIONS { |