This is proof of concept using the original elfloader 3.0 compiled for linux (instead of glibc ld.so in the original emulator).
Currently implemented only a few sets of Siemens Mobile firmware functions. Mostly libc-like functions and partly filesystems.
In this emulator used modified elfloader 3.0 with integrated gdb support.
# Required software (Ubuntu)
sudo apt install crossbuild-essential-armhf libc6-armhf-cross
# Dir with all stuff
mkdir -p ~/dev/sie
cd ~/dev/sie
# SDK with libs
git clone https://github.com/siemens-mobile-hacks/sdk
# Emulator
git clone https://github.com/Azq2/elfloader3-linux
cd elfloader3-linux
git submodule init
git submodule update
cmake -B build
cmake --build build -- -j$(nproc)
make./build/elfloader3 -V -f ../sdk/libc++/tests/cxx11tests_NSG.elf
# One terminal
qemu-arm -g 1234 ./build/elfloader3 -V -f ../sdk/libc++/tests/cxx11tests_NSG.elf
# Second terminal
./gdb.sh
Original idea by @zvova7890: https://bitbucket.org/vova7890/qemu-siemens-elf/src/master/