HelenOS sources

ESR_EC_FP         122 boot/arch/arm64/include/arch/regutils.h #define ESR_EC_FP  0x07
ESR_EC_FP         122 kernel/arch/arm64/include/arch/regutils.h #define ESR_EC_FP  0x07
ESR_EC_FP         122 uspace/lib/c/arch/arm64/include/libarch/regutils.h #define ESR_EC_FP  0x07

HelenOS homepage, sources at GitHub