08048568 <phase_1>: ; phase_1(char s[])
;; setup stack frame for phase_1
8048568: 55 push %ebp
8048569: 89 e5 mov %esp,%ebp
804856b: 83 ec 38 sub $0x38,%esp
;; ?? place (not push) parameters on stack before calling sscanf
; -0x24(%ebp) local variable: a
804856e: 8d 45 ec lea 0xffffffec(%ebp),%eax
; make %edx contain address a + 8
8048571: 8d 50 08 lea 0x8(%eax),%edx
; make %eax contain address a
8048574: 8d 45 ec lea 0xffffffec(%ebp),%eax
; now make %eax contain address a + 4
8048577: 83 c0 04 add $0x4,%eax
; move address a + 8 to %esp + 16
804857a: 89 54 24 10 mov %edx,0x10(%esp)
; move address a + 4 to %esp + 12
804857e: 89 44 24 0c mov %eax,0xc(%esp)
; make %eax contain address a
8048582: 8d 45 ec lea 0xffffffec(%ebp),%eax
; address a moved to %esp + 8
8048585: 89 44 24 08 mov %eax,0x8(%esp)
; something moved to %esp + 4
8048589: c7 44 24 04 48 87 04 movl $0x8048748,0x4(%esp)
8048590: 08
; move 1st param to %eax
8048591: 8b 45 08 mov 0x8(%ebp),%eax
; move 1st param, s, to address %esp + 0
8048594: 89 04 24 mov %eax,(%esp)
;; call sscanf - look at previous instructions for parameters
; sscanf(s, fmt, a, a + 4, a + 8)
8048597: e8 08 fe ff ff call 80483a4 <sscanf@plt>
; -8(%ebp) local variable: n = return value from sscanf
804859c: 89 45 f8 mov %eax,0xfffffff8(%ebp)
;; checking number of conversions by sscanf
804859f: 83 7d f8 03 cmpl $0x3,0xfffffff8(%ebp) ;
; if (n == 3) goto 80485aa
80485a3: 74 05 je 80485aa <phase_1+0x42>
80485a5: e8 2e 00 00 00 call 80485d8 <explode> ; call explode
;; ok 3 numbers read. what next?
; -4(%ebp) local variable: b = 0
80485aa: c7 45 fc 00 00 00 00 movl $0x0,0xfffffffc(%ebp)
; n = n - 1
80485b1: 83 6d f8 01 subl $0x1,0xfffffff8(%ebp)
;; loop starts with unconditional jump to test (at end of loop body)
80485b5: eb 0e jmp 80485c5 <phase_1+0x5d> ; goto 80485c5
80485b7: 8b 45 f8 mov 0xfffffff8(%ebp),%eax ;
%eax contains n
; -0x24(%ebp) + 4 * n moved to %eax - that is, %eax = a[n]
80485ba: 8b 44 85 ec mov 0xffffffec(%ebp,%eax,4),%eax
80485be: 01 45 fc add %eax,0xfffffffc(%ebp) ; b = b + a[n]
80485c1: 83 6d f8 01 subl $0x1,0xfffffff8(%ebp) ; n = n - 1
80485c5: 83 7d f8 00 cmpl $0x0,0xfffffff8(%ebp) ;
80485c9: 79 ec jns 80485b7 <phase_1+0x4f> ; if (n >= 0) goto 8045b7
;jns means jump if the comparison was not negative (not 'signed'; jge)
80485cb: 83 7d fc 12 cmpl $0x12,0xfffffffc(%ebp) ;
80485cf: 74 05 je 80485d6 <phase_1+0x6e> ; if (b == 0x12) goto 80485d6
80485d1: e8 02 00 00 00 call 80485d8 <explode> ; call explode
80485d6: c9 leave
80485d7: c3 ret