Re: [PATCH] linux-user/elfload: Fix handling of pure BSS segments

[Stephen Long]

Alex Bennee <alex.bennee@linaro.org> writes:

>> Apologies for the unclear commit msg. I was also seeing a SIGSEGV in
>> zero_bss() with the binaries I was generating. I was using LLD to generate
>> the binaries. The binaries all had LOAD segments with a file size of
>> 0.
>
> How hairy is the generation of these binaries? If it's all doable with
> standard gcc/ldd command lines it would be useful to add them as a
> tcg/multiarch test case.

We are linking with an old version of musl. I was able to produce an
ELF with a LOAD segment just for the BSS with the following:

volatile int num;

int main(void) {
    return num;
}

and compiling it with just aarch64-linux-gnu-gcc -fuse-ld=lld -static and
linking with cross compiled musl v1.1.9 on Ubuntu. I tried it with glibc and
it has a bunch of non-BSS variables, so the data section gets created.