arm hard float point

allen_kim1 — Thu, 02 Mar 2017 03:16:15 GMT

Dear Community

i have a question about arm hard float point option

we need arm float point option on LTIB tool chain

i write some example code and compile with LTIB , yocto

binary that compiled with LTIB has no FLAGS ( hard-float ABI )

binary that compiled with yocto has a hard-float ABI FLAGS

LTIB latest toolchain ( 20130816 version )
/opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-gcc -c float_sum.cpp -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 /opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-gcc -o float_test float_sum.o float_test.cpp -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 -lpthread allen_kim@host:~/test_hf/src$ readelf -h float_test ELF Header: Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 Class: ELF32 Data: 2's complement, little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: EXEC (Executable file) Machine: ARM Version: 0x1 Entry point address: 0x83c4 Start of program headers: 52 (bytes into file) Start of section headers: 2396 (bytes into file) Flags: 0x5000002, has entry point, Version5 EABI Size of this header: 52 (bytes) Size of program headers: 32 (bytes) Number of program headers: 8 Size of section headers: 40 (bytes) Number of section headers: 30 Section header string table index: 27

LTIB latest toolchain ( 20130816 version )

/opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-gcc -c float_sum.cpp -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9

/opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-gcc -o float_test float_sum.o float_test.cpp -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 -lpthread

allen_kim@host:~/test_hf/src$ readelf -h float_test

ELF Header:

Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00

Class: ELF32

Data: 2's complement, little endian

Version: 1 (current)

OS/ABI: UNIX - System V

ABI Version: 0

Type: EXEC (Executable file)

Machine: ARM

Version: 0x1

Entry point address: 0x83c4

Start of program headers: 52 (bytes into file)

Start of section headers: 2396 (bytes into file)

Flags: 0x5000002, has entry point, Version5 EABI

Size of this header: 52 (bytes)

Size of program headers: 32 (bytes)

Number of program headers: 8

Size of section headers: 40 (bytes)

Number of section headers: 30

Section header string table index: 27

yocto 4.1.15 toolchain
/opt/fsl-imx-fb/4.1.15-1.1.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc -c float_sum.cpp -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 --sysroot=/opt/fsl-imx-fb/4.1.15- 1.1.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/ /opt/fsl-imx-fb/4.1.15-1.1.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc -o float_test_yocto float_sum.o float_test.cpp -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 -lpthread --sysroot=/opt/fsl-imx-fb/4.1.15-1.1.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/ allen_kim@host:~/test_hf/src$ readelf -h float_test_yocto ELF Header: Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 Class: ELF32 Data: 2's complement, little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: EXEC (Executable file) Machine: ARM Version: 0x1 Entry point address: 0x10444 Start of program headers: 52 (bytes into file) Start of section headers: 9228 (bytes into file) Flags: 0x5000402, has entry point, Version5 EABI, hard-float ABI Size of this header: 52 (bytes) Size of program headers: 32 (bytes) Number of program headers: 8 Size of section headers: 40 (bytes) Number of section headers: 39 Section header string table index: 36

yocto 4.1.15 toolchain

/opt/fsl-imx-fb/4.1.15-1.1.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc -c float_sum.cpp -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 --sysroot=/opt/fsl-imx-fb/4.1.15-

1.1.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/
/opt/fsl-imx-fb/4.1.15-1.1.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc -o float_test_yocto float_sum.o float_test.cpp -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 -lpthread --sysroot=/opt/fsl-imx-fb/4.1.15-1.1.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/

allen_kim@host:~/test_hf/src$ readelf -h float_test_yocto

ELF Header:

Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00

Class: ELF32

Data: 2's complement, little endian

Version: 1 (current)

OS/ABI: UNIX - System V

ABI Version: 0

Type: EXEC (Executable file)

Machine: ARM

Version: 0x1

Entry point address: 0x10444

Start of program headers: 52 (bytes into file)

Start of section headers: 9228 (bytes into file)

Flags: 0x5000402, has entry point, Version5 EABI, hard-float ABI

Size of this header: 52 (bytes)

Size of program headers: 32 (bytes)

Number of program headers: 8

Size of section headers: 40 (bytes)

Number of section headers: 39

Section header string table index: 36

how can i support hard-float ABI in LTIB crosstool chain ?

please guide me

Thanks BR

Re: arm hard float point

Yuri — Thu, 02 Mar 2017 04:04:10 GMT

Hello

I hope the following helps.

https://community.nxp.com/message/862949

Have a great day,
Yuri

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