On Mon, Feb 25, 2019 at 10:30 AM Stefan Hajnoczi <stefa...@gmail.com> wrote:
> On Sat, Feb 23, 2019 at 3:55 PM Natanael Copa <nc...@alpinelinux.org> wrote:
> > On Fri, 22 Feb 2019 14:04:20 +0000
> > Stefan Hajnoczi <stefa...@gmail.com> wrote:
> > > On Fri, Feb 22, 2019 at 12:57 PM Fernando Casas Schössow
> > > <casasferna...@outlook.com> wrote:
> > I tried to find this section. How do you get the assembly listing of
> > relevant secion? I tried to do "disas virtio_pop" from
> > `gdb /usr/bin/qemu-system-x86_64` from the binary in alpine edge. I
> > could find 2 memcpy but none of them look like a 16 bit operation after:
> >
> > 0x00000000004551f1 <+353>: mov 0x10(%rsp),%rdi
> > 0x00000000004551f6 <+358>: mov $0x10,%edx
> > 0x00000000004551fb <+363>: callq 0x3879e0 <memcpy@plt>
> > 0x0000000000455200 <+368>: movzwl 0x5c(%rsp),%eax
> > 0x0000000000455205 <+373>: test $0x4,%al
> > 0x0000000000455207 <+375>: je 0x4552aa <virtqueue_pop+538>
> >
> > ....
> >
> > 0x0000000000455291 <+513>: mov 0x10(%rsp),%rdi
> > 0x0000000000455296 <+518>: mov $0x10,%edx
> > 0x000000000045529b <+523>: callq 0x3879e0 <memcpy@plt>
> > 0x00000000004552a0 <+528>: mov %rbp,0x20(%rsp)
> > 0x00000000004552a5 <+533>: movzwl 0x5c(%rsp),%eax
> > 0x00000000004552aa <+538>: lea 0x20e0(%rsp),%rdi
> > 0x00000000004552b2 <+546>: xor %r11d,%r11d
> > 0x00000000004552b5 <+549>: mov %r15,0x38(%rsp)
>
> Here is the beginning of the function:
This was built from the docker alpine image:
REPOSITORY TAG IMAGE ID CREATED
SIZE
docker.io/alpine latest caf27325b298 3 weeks
ago 5.52 MB
aports git commit: be41538f0061b406a374564a0043a363efcb0293
gcc (Alpine 8.2.0) 8.2.0
Stefan
