functest3.s

来自「不错的X86汇编代码示例」· S 代码 · 共 48 行

# functest3.s - An example of using C style functions
.section .data
precision:
   .byte 0x7f, 0x00
.section .bss
   .lcomm result, 4
.section .text
.globl _start
_start:
   nop
   finit
   fldcw precision

   pushl $10
   call area
   addl $4, %esp
   movl %eax, result

   pushl $2
   call area
   addl $4, %esp
   movl %eax, result

   pushl $120
   call area
   addl $4, %esp
   movl %eax, result

   movl $1, %eax
   movl $0, %ebx
   int $0x80

.type area, @function
area:
   pushl %ebp
   movl %esp, %ebp
   subl $4, %esp
   fldpi
   filds 8(%ebp)
   fmul %st(0), %st(0)
   fmulp %st(0), %st(1)
   fstps -4(%ebp)
   movl -4(%ebp), %eax

   movl %ebp, %esp
   popl %ebp
   ret