A Migration Method of MPI Program Combining Local Library Replacement and Instruction Translation

Algorithm 2

Automatic extraction algorithm of library function information.

//function: identify and store dynamic linked library

function when loading executable file

//input: executable file handle, .sym section head,

 .rel.plt section pointer, .plt section pointer

//output: library function message queue (func_info)

init func_info

set null func_info

Foreach elf_rel_plt in  .rel.plt

 create a rela_plt_func_info object

 func_addr = extract the offset address of elf_rel_plt

 func_name = extract the  .sym name

Endfor

Foreach elf_plt in  .plt

 add_var = 32-bit data after moving the elf_plt address

16 bits to right + elf_plt address + 6

if (func_addr == add_var)

func_call_addr = elf_plt address + index (unit width)

Endfor