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Hi,
I am using "gcc-arm-none-eabi-4_9-2015q1" to compile ARMv8 - A53/A57 code and getting following errors while compiling assembly files -
I am giving -march='armv8-a' option. I am not sure how to resolve this ?
Assembler messages: Error: bad instruction `stp x4,x5,[sp,#-16]!' Error: ARM register expected -- `ldr x4,=0xff000004eeaa4400' Error: selected processor does not support requested special purpose register -- `msr mair_el2,x4' Error: ARM register expected -- `ldr x4,=0x80002500' Error: selected processor does not support requested special purpose register -- `msr tcr_el2,x4' Error: ARM register expected -- `mov x4,x0' Error: selected processor does not support requested special purpose register -- `msr ttbr0_el2,x4' Error: bad instruction `tlbi alle2'
Previously I was using Linaro toolchain "gcc-linaro-aarch64-none-elf-4.9-2014.07_linux" but I am facing issue where it is generating some bad code.
I tried resolving that but it doesn't seems to be my code problem so I wanted to give a shot with other gcc toolchain. Also both gcc toochains doesn't accept -march=armv8-a option or mcpu option.
Does any one know what are the correct parameters and best gcc toolchain to use ?
Thanks
That's the tools for the 32 bit architecture rather than the 64 bit one. The armv8-a option won't select aarch64 - it'll just enable load-acquire and suchlike that are added to the 32 bit instruction set with armv8. I haven't the foggiest where it got those messages from!