On Wed, Aug 17, 2016 at 8:10 AM, Andrey Ryabinin
<aryabinin@xxxxxxxxxxxxx> wrote:
> Commit e41f501d3912 ("vmlinux.lds: account for destructor sections")
> added '.text.exit' to EXIT_TEXT which is discarded at link time by default.
> This breaks compilation of UML:
> `.text.exit' referenced in section `.fini_array' of
> /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/libc.a(sdlerror.o):
> defined in discarded section `.text.exit' of
> /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/libc.a(sdlerror.o)
>
> Apparently UML doesn't want to discard exit text, so let's place all EXIT_TEXT
> sections in .exit.text.
>
> Fixes: e41f501d3912 ("vmlinux.lds: account for destructor sections")
> Reported-by: Stefan Traby <stefan@xxxxxxxxxxxxxxxxx>
> Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # 4.0+
> ---
> arch/um/include/asm/common.lds.S | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/um/include/asm/common.lds.S b/arch/um/include/asm/common.lds.S
> index 1dd5bd8..1330553 100644
> --- a/arch/um/include/asm/common.lds.S
> +++ b/arch/um/include/asm/common.lds.S
> @@ -81,7 +81,7 @@
> .altinstr_replacement : { *(.altinstr_replacement) }
> /* .exit.text is discard at runtime, not link time, to deal with references
> from .altinstructions and .eh_frame */
> - .exit.text : { *(.exit.text) }
> + .exit.text : { EXIT_TEXT }
> .exit.data : { *(.exit.data) }
>
> .preinit_array : {
> --
> 2.7.3
>
Sorry for delays, I am travelling.
Do we need ".fini_array" section? It's also destructors that we don't
run. Or does UML use them? Does discarding ".fini_array" help?
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