Hi, I've been trying to use libpng inside the secure world of i.MX53 QSB TrustZone aware TZ_VMM example.

I want to receive an image from the normal world (running Linux) and do some process the image in some way inside the secure world.

I understand the flow of genode and tz_vmm in particular and there are some examples on how to communicate data between the normal and secure world, so that's not my problem right now. My problem is that I cannot run tz_vmm after adding libpng as a lib.

In order to use libpng inside tz_vmm I did the following:

1) in $(BUILDDIR)/etc/build.conf uncommented this line

REPOSITORIES += $(GENODE_DIR)/repos/libports

2) inside $(GENODE_DIR)/repos/libports I did:

make prepare PKG="libc zlib libpng"

3) inside $(BUILDDIR)/repos/os/src/server/tz_vmm/spec/imx53 I added the following to target.inc

LIBS += libc

LIBS += zlib

LIBS += libpng

4) then I added #include <png.h> inside main.cc

5) finally inside $(BUILDDIR) I did

make run/tz_vmm

All these steps compiled fine, but when I run this on my board the following message comes up:

## Booting kernel from Legacy Image at 70200000 ...

Image Name:

Image Type: ARM Linux Kernel Image (gzip compressed)

Data Size: 7888432 Bytes = 7.5 MiB

Load Address: 70010000

Entry Point: 70010000

Verifying Checksum ... OK

Uncompressing Kernel Image ... OK

Starting kernel ...

kernel initialized

Genode 16.02

int main(): --- create local services ---

int main(): --- start init ---

int main(): transferred 242 MB to init

int main(): --- init created, waiting for exit condition ---

[init] Could not open ROM session for module "ld.lib.so"

[init] parent provides

[init] service "ROM"

[init] service "RAM"

[init] service "IRQ"

[init] service "IO_MEM"

[init] service "IO_PORT"

[init] service "CAP"

[init] service "PD"

[init] service "RM"

[init] service "CPU"

[init] service "LOG"

[init] service "SIGNAL"

[init] service "VM"

[init] Dynamically linked file found, but no dynamic linker binary present

[init] unknown exception?

[init] child "tz_vmm"

[init] RAM quota: 10203136

[init] ELF binary: tz_vmm

[init] priority: 0

What have I done wrong? It seems I need to add a binary somewhere, but I don't know where. Do I need to compile anything else in order to libpng to be usable inside genode?

Thanks in advance!

Best regards, Tiago