ref: 3e7ad6ef67711cbf73c61d1ab2d77c82a2ff7b3c dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4