Defined in 5 files as a macro:
- sys/arm64/include/reg.h, line 70 (as a macro)
- sys/mips/include/reg.h, line 85 (as a macro)
- sys/powerpc/include/reg.h, line 57 (as a macro)
- sys/sparc64/include/reg.h, line 107 (as a macro)
- sys/x86/include/reg.h, line 96 (as a macro)