PHP: internals:aarch64-cross-compile

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====== AArch64 PHP/JIT: Cross Compilation and running in QEMU ====== 

This instruction assumes, the php source files of master branch are installed in ''/home/dmitry/php/php-master''. Please correct all the relevant paths according to your real path.

===== Install cross-compilers ===== 

<code sh>
sudo dnf install gcc-aarch64-linux-gnu gcc-c++-aarch64-linux-gnu binutils-aarch64-linux-gnu
</code>

===== Install QEMU ===== 

1. Install necessary packages

<code sh>
sudo dnf install qemu-system-aarch64
sudo dnf install cloud-utils
</code>

2. Create directory for VM image file

<code>
mkdir -p /home/dmitry/php/php-master/ARM64
cd /home/dmitry/php/php-master/ARM64
</code>

3. Download system image files

<code sh>
wget https://cloud-images.ubuntu.com/releases/16.04/release/ubuntu-16.04-server-cloudimg-arm64-uefi1.img
wget https://releases.linaro.org/components/kernel/uefi-linaro/16.02/release/qemu64/QEMU_EFI.fd
</code>

4. Create file cloud.txt with the following context. Add your real name (I recommend to use the same name as on host system) and your ssh public key.

<code>
#cloud-config
users:
  - name: <your_name>
    ssh-authorized-keys:
      - <your_ssh_public_key>
    sudo: ['ALL=(ALL) NOPASSWD:ALL']
    groups: sudo
    shell: /bin/bash
</code>

5. Create user image file

<code sh>
cloud-localds --disk-format qcow2 cloud.img cloud.txt
</code>

6. Start QEMU

<code sh>
qemu-system-aarch64 \
 -smp 2 \
 -m 2048 \
 -M virt \
 -cpu cortex-a57 \
 -bios QEMU_EFI.fd \
 -nographic \
 -device virtio-blk-device,drive=hd0 \
 -drive if=none,file=ubuntu-16.04-server-cloudimg-arm64-uefi1.img,id=hd0 \
 -device virtio-blk-device,drive=cloud \
 -drive if=none,id=cloud,file=cloud.img \
 -virtfs local,path=/home/dmitry/php/php-master,mount_tag=php-master,security_model=passthrough,id=php-master \
 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp:127.0.0.1:2222-:22
</code>

this will take a wile...

7. Connect to running VM through SSH

<code sh>
ssh -p 2222 dmitry@127.0.0.1
</code>

The following instructions are executed on guest VM...

8. Install necessary packages (the list may be incomplete)

<code sh>
sudo apt-get update
sudo apt-get install git autoconf automake bison build-essential curl flex \
 libtool libssl-dev libcurl4-openssl-dev libxml2-dev libreadline-dev \
 libsqlite3-dev nginx openssl   pkg-config re2c sqlite3 zlib1g-dev \
 gdb linux-tools-common
</code>

9. Mount PHP source directory

Add the following line to /etc/fstab

<code>
php-master   /home/dmitry/php/php-master    9p      noauto,trans=virtio,version=9p2000.L   0 0
</code>

<code sh>
mkdir -p /home/dmitry/php/php-master
sudo mount /home/dmitry/php/php-master
</code>

10. Copy include/lib files to host

<code sh>
cd /home/dmitry/php/php-master/ARM64
mkdir -p lib/aarch64-linux-gnu
mkdir -p usr/include
mkdir -p usr/lib
cp -a /lib/aarch64-linux-gnu lib
cp -a /usr/include usr
cp -a /usr/lib usr
cd usr/lib
ln -s aarch64-linux-gnu/crt1.o crt1.o
ln -s aarch64-linux-gnu/crti.o crti.o
ln -s aarch64-linux-gnu/crtn.o crtn.o
cd aarch64-linux-gnu
ln -sf ../../../lib/aarch64-linux-gnu/libdl.so.2 libdl.so
</code>

===== Cross-Compilation (on host system) ===== 

<code sh>
mkdir /home/dmitry/php/php-master/ARM64-DEBUG
cd /home/dmitry/php/php-master/ARM64-DEBUG
CC='aarch64-linux-gnu-gcc --sysroot=/home/dmitry/php/php-master/ARM64 -I/home/dmitry/php/php-master/ARM64/usr/include/aarch64-linux-gnu -L/home/dmitry/php/php-master/ARM64/usr/lib/aarch64-linux-gnu -Wl,-rpath-link,/home/dmitry/php/php-master/ARM64/lib/aarch64-linux-gnu' \
  '../configure' \
  '--host=aarch64-linux-gnu' \
  '--target=aarch64-linux-gnu' \
  '--prefix=/home/dmitry/php/php-master/ARM64/DEBUG' \
  '--with-config-file-path=/home/dmitry/php/php-master/ARM64/DEBUG/etc' \
  '--disable-all' \
  '--enable-opcache' \
  '--enable-debug' \
  '--enable-filter' \
  '--enable-pdo' \
  '--enable-session' \
  '--enable-tokenizer' \
  '--with-iconv' \
  '--with-pdo-mysql=mysqlnd' \
  '--with-mysqli=mysqlnd'
make
make install
</code>

===== Testing (on guest QEMU system) ===== 

<code>
cd /home/dmitry/php/php-master/ARM64-DEBUG
cp ext/opcache/.libs/opcache.so ext/opcache/.libs/opcache.la modules
make test TESTS="ext/opcache/tests/jit"
</code>
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