ref: 29b7a5ea3d9a74232a6d23c1fb288f1240bcc2ba dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4