Which registers should be preserved in MIPS?

in MIPS which registers should be preserved on st开发者_JAVA技巧ack to prevent data loss. (T-S-A-V-RA REGISTERS)

According to my MIPS reference sheet, the following registers are callee-saves (have to be preserved by the called function) while the rest are caller-saves (aren't required to be preserved by a called function):

• $s0 - $s7 (registers 16-23), the saved temporaries
• $gp (register 28), the global pointer
• $sp (register 29), the stack pointer
• $fp (register 30), the frame pointer
• $rp (register 31), the return address

(Note, $rp is listed as not saved in other versions of the cheat sheet.)

Source: Computer organization and design