boot: Ensure ARM UEFI binary does not contain FP/SIMD instructions
ARM toolchains will sometimes optimize otherwise floating-point-free code with floating point and SIMD instructions. This was happening with systemd-bootarm.efi and it was causing U-Boot to crash and reset the CPU. U-Boot does not support the ARM VFP floating point coprocessor, which is an optional piece of hardware anyway [1]. Ensure the compiler does not generate FP/SIMD instructions by supplying the `-mgeneral-regs-only` option when building for ARM [2]. The other option you often see to solve these problems is `-msoft-float`, but that changes the ABI and prevents linking with libgnuefi. [1] https://lists.denx.de/pipermail/u-boot/2011-February/087736.html [2] https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html#index-mgeneral-regs-only-1
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@ -155,6 +155,8 @@ if have_gnu_efi
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elif efi_arch == 'ia32'
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compile_args += ['-mno-sse',
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'-mno-mmx']
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elif efi_arch == 'arm'
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compile_args += ['-mgeneral-regs-only']
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endif
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if get_option('werror') == true
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compile_args += ['-Werror']
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