.section .text.FirstSector(这句话不理解)
应该是定义一个段,.text为代码区,可以参考GUN ARM Assembler Quick Reference。
.section <section_name> {,"<flags>"}解释:Statrts a new code or data section.Sections in Gun are called .text, a code section, .data, an initialied data section, and .bss, an uninitialized data section. These sections have default flags,and the linker understands the default names(similar directive to the armasm directive AREA).The following are allowable .section flags for ELF format files:
<Flag> meaning
a allowable section
w writable section
x executable section