usr/src/libc/sys/execv.s

# C library -- execv

# execv(file, argv);
#
# where argv is a vector argv[0] ... argv[x], 0
# last vector element must be 0

.globl  _execv
.globl  _environ

_execv:
        .word   0x0000
        pushl   _environ  #  default environ
        pushl   8(ap)     #  argv
        pushl   4(ap)     #  file
        calls   $3,_execve
        ret