node.js

最近在HISI3535平台上要用到node.js，記錄porting上面遇到問題
順便了解一下

更新記錄

item	note
20160203	第一版

Node.js

Node.js is a JavaScript runtime built on Chrome’s V8 JavaScript engine.(出處)
- node.js使用chrome v8解譯器
- V8 is Google’s open source, high performance JavaScript engine.(出處)
- V8 implements ECMAScript as specified in ECMA-262, 5th edition
Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient
- node.js是javascript直譯器，跟lua很像(也是直譯)，使用JS語法就可以當成app而且還有一堆package
NodeJS的作者说，他创造NodeJS的目的是为了实现高性能Web服务器，他首先看重的是事件机制和异步IO模型的优越性，而不是JS(出處)

Node.js LTS

Node.js Long-term Support Working Group

Release	LTS End	node / V8 版本
v0.10	2016-10-01	v.0.10.41-rc1 /2012-10-22: Version 3.14.5
v0.12	2017-04-01	v.0.12.9 /2014-08-12: Version 3.28.71
v4.2.0	2018-04-01	v.4.2.6 / 2015-07-08: Version 4.5.103

注意：V8在3.18板之後就不支援VFP2

Cross Compile NodeJS

Cross Compile V0.10.41-RC1

git clone https://github.com/nodejs/node.git
cd node ; git checkout v0.10.41

export AR="arm-hisiv200-linux-ar"
export CC="arm-hisiv200-linux-gcc"
export CXX="arm-hisiv200-linux-g++"
export LD="arm-hisiv200-linux-ld"
export AS="arm-hisiv200-linux-as"
export GYP_DEFINES="armv7=0"
./configure --without-snapshot --without-ssl --dest-cpu=arm --dest-os=linux
make -j 2

Cross Compile V0.12.9

V8採用3.28.71，即不support VFP2

因此即使用compile成功，但執行但失敗如下，看來還是無使用V0.12.9 node.js（受限於V8 source 改版)

V8 source

1 2	deps/v8/src/base/cpu.cc o['variables']['arm_fpu'] = 'vfpv3' # V8 3.18 no longer supports VFP2.

Hisi3535 runtime error

# ./node-v120-t6 --v8-options | head -2
target arm v7 vfp3 softfp
ARMv7=1 VFP3=1 VFP32DREGS=1 NEON=0 SUDIV=0 UNALIGNED_ACCESSES=1 MOVW_MOVT_IMMEDIATE_LOADS=0 USE_EABI_HARDFLOAT=0
# ./node-v120-t6  -e 'console.log("het werkt!");'
Illegal instruction

HISI3535 GCC tools採用arch=armv5te產生，但HI3535裡面是armv7-a

在手刪中有強調需要增加(march=armv7-a -mcpu=cortex-a9)

手冊中說明

Hi3535无硬浮点单元，文件系统中发布的库都是无硬浮点单元的库。但是，工具链默认的是armv5的指令集，而Hi3535是armv7的指令集，因此请用户注意，所有Hi3535板端代码编译时需要在Makefile里面添加以下命令：
         CFLAGS += -march=armv7-a -mcpu=cortex-a9
         CXXFlAGS +=-march=armv7-a -mcpu=cortex-a9
         其中CXXFlAGS中的XX根据用户Makefile中所使用宏的具体名称来确定，e.g:CPPFLAGS。

gcc tools 使用armv5te產生

root@b682b1efa3d7:/opt/DOCKER-erwin-build-hiv200/work/github/node-org# arm-hisiv200-linux-gcc -v
Using built-in specs.
Target: arm-hisiv200-linux-gnueabi
Configured with: ../gcc-4.4-2010q1/configure --host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --target=arm-hisiv200-linux-gnueabi --prefix=/home/c00132816/toolchain_glibc/install/arm-hisiv200-linux --enable-threads --disable-libmudflap --disable-libssp --disable-libstdcxx-pch --with-arch=armv5te --with-gnu-as --with-gnu-ld --enable-languages=c,c++ --enable-shared --enable-lto --enable-symvers=gnu --enable-__cxa_atexit --disable-nls --enable-extra-hisi-multilibs --with-sysroot=/home/c00132816/toolchain_glibc/install/arm-hisiv200-linux/target --with-build-sysroot=/home/c00132816/toolchain_glibc/install/arm-hisiv200-linux/target --with-gmp=/home/c00132816/toolchain_glibc/install/host_lib --with-mpfr=/home/c00132816/toolchain_glibc/install/host_lib --with-ppl=/home/c00132816/toolchain_glibc/install/host_lib --with-cloog=/home/c00132816/toolchain_glibc/install/host_lib --with-libelf=/home/c00132816/toolchain_glibc/install/host_lib --with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bstatic -lm' --enable-libgomp --enable-poison-system-directories --with-libelf=/home/c00132816/toolchain_glibc/install/host_lib --with-pkgversion='Hisilicon_v200(gcc4.4-290+glibc-2.11+eabi+nptl)' --with-bugurl=http://www.hisilicon.com/cn/service/claim.html
Thread model: posix
gcc version 4.4.1 (Hisilicon_v200(gcc4.4-290+glibc-2.11+eabi+nptl))

於板端cpuinfo是無vfpv3 support

# cat /proc/cpuinfo
Processor       : ARMv7 Processor rev 1 (v7l)
processor       : 0
BogoMIPS        : 1987.37

processor       : 1
BogoMIPS        : 1993.93

Features        : swp half thumb fastmult edsp tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x4
CPU part        : 0xc09
CPU revision    : 1

Hardware        : hi3535
Revision        : 0000
Serial          : 0000000000000000
#

Discontinuation of V8 support for ARM chips without VFPv2

arm cross compile">arm cross compile

gcc工具名稱定義

目前手邊工具有：arm-hisiv200-linux-gcc、mips-openwrt-linux-musl-gcc

其名稱定義 arch - vendor - os - eabi

arch：指名板端CPU架構(ARM/MIPS)
vendor: 工具提供廠商
os：板端作業系統(OS)
eabi:嵌入試應用(Embedded Application Binary Interface)
ex.
- arm-none-eabi：用於沒有OS(即MCU)，因此無提供fork等功能
- arm-none-linux-eabi：用於Linux，使用Glibc等
- arm-none-uclinuxeabli-gcc：用於uCLinux

abi及abihf不同 (arm-linux-gnueabi-gcc 及arm-linux-gnueabihf-gcc)

mfloat-abi=name
Specifies which floating-point ABI to use. Permissible values are: ‘soft’, ‘softfp’ and ‘hard’.
- soft: causes GCC to generate output containing library calls for floating-point operations
  不使FPU硬体進行浮點計算，即使用軟体模式
- softfp： allows the generation of code using hardware floating-point instructions, but still uses the soft-float calling conventions.
  armel(對應gcc: arm-linux-gnuabi-gcc)，使用FPU硬体計算，但採用soft return code
- hard： allows generation of floating-point instructions and uses FPU-specific calling conventions.
  armhf(對應gcc： arm-linux-gnueabihf-gcc)，使用FPU硬体計算，採用hardware return code
mfpu=name
- This specifies what floating-point hardware (or hardware emulation) is available on the target. Permissible names are: ‘vfp’, ‘vfpv3’, ‘vfpv3-fp16’, ‘vfpv3-d16’, ‘vfpv3-d16-fp16’, ‘vfpv3xd’, ‘vfpv3xd-fp16’, ‘neon’, ‘neon-fp16’, ‘vfpv4’, ‘vfpv4-d16’, ‘fpv4-sp-d16’, ‘neon-vfpv4’, ‘fpv5-d16’, ‘fpv5-sp-d16’, ‘fp-armv8’, ‘neon-fp-armv8’ and ‘crypto-neon-fp-armv8’.

Floating-point (VFP)定義">Floating-point (VFP)定義

VFP	Description
VFP1	已废弃
VFP2	ARMv5TE、ARMv5TEJ 和 ARMv6 架构中 ARM 指令集的可选扩展
	VFPv2 has 16 64-bit FPU registers
VFPv3 or VFPv3-D32	ARMv7-A 和 ARMv7-R 配置文件中 ARM
	backwards compatible with VFPv2
	FPv3 has 32 64-bit FPU registers as standard..
VFPv3-D16	16 64-bit FPU registers. Implemented on Cortex-R4 and R5