Summary: * Read armV7-A/R reference manual and analyze bugs.

Details: * Read armV7-A/R reference manual and share the instruction set part with local team. * Analyze bugs: LP: #889985 "binaries: can't step out of helper functions" and LP: #889984 "binaries: should step across helper functions"

Plan: * Ramp-up on gcc.

Planed leave: * Jan 21 - 29: Chinese new year holiday.

Best regards! -Zhenqiang