0.11%&0,23,45%#5personal.denison.edu/~bressoud/cs281-f12/supplements/05-machin… · denison...
TRANSCRIPT
Denison University
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Denison University
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Denison University
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Denison University
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Denison University
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Denison University
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Denison University
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Denison University
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Denison University
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!-23C?4,(Ogcc -SP
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Denison University
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C/1=%+%&0,2&6/,U55'1c+;C,C/<'int sum(int x, int y){ int t = x+y; return t;}
i'&'."6'<,2UNK,U55'1c+;sum: pushl %ebp movl %esp,%ebp movl 12(%ebp),%eax addl 8(%ebp),%eax popl %ebp ret
Qc6"%&,R%6$,#/11"&<
/usr/local/bin/gcc –O1 -S code.c
-./<A#'5,W+',code.s
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Denison University
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C/<',Z/.,sum0x401040 <sum>: 0x55 0x89 0xe5 0x8b 0x45 0x0c 0x03 0x45 0x08 0x5d 0xc3
Qch'#6,C/<'! U55'1c+'.
! 7,9*6?9+46(.s(C*+-(.o! ;C*9,5(4*0-.C*H(-G(4908(C*6+,/01-*! l49,?5#0-23?4+4(C29H4(-G(4L40/+9>?4(0-.4! IC66C*H(?C*<9H46(>4+=44*(0-.4(C*(.CJ4,4*+(
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! `:H:B(0-.4(G-,(malloc/*printf! "-24(?C>,9,C46(9,4(!"#$%&'$((")(&#*+!
! KC*<C*H(-00/,6(=84*(3,-H,92(>4HC*6(4L40/1-*
! "#$%&'#('))'*+$,-
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! 9$%3$-'%$'%::3,--'0x401040
Denison University
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! F..(+=-(6CH*4.(C*+4H4,6! U55'1c+;
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! W34,9*.6'x)( N4HC6+4,( %eaxy)( I42-,5( +0%ebp+8]t)( N4HC6+4,( %eax
n N4+/,*(G/*01-*(g9?/4(C*(%eax! Qch'#6,C/<'
! X#>5+4(C*6+,/01-*! "+-,4.(9+(9..,466(0x80483ca
int t = x+y;
addl 8(%ebp),%eax
0x80483ca: 03 45 08
E%1%+".,6/,'7=.'55%/&3,
x += y
!/.',=.'#%5'+;3int eax;int *ebp;eax += ebp[2]
Denison University
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T%5"55'1c+'<
T%5"55'1c+%&0,Qch'#6,C/<'
! T%5"55'1c+'.objdump -d p! \64G/?(+--?(G-,(4L92C*C*H(->Q40+(0-.4! F*9?5j46(>C+(39e4,*(-G(64,C46(-G(C*6+,/01-*6! T,-./046(933,-LC29+4(,4*.C1-*(-G(96642>?5(0-.4! !9*(>4(,/*(-*(4C+84,(a.out(O0-23?4+4(4L40/+9>?4P(-,(.o(c?4
080483c4 <sum>: 80483c4: 55 push %ebp 80483c5: 89 e5 mov %esp,%ebp 80483c7: 8b 45 0c mov 0xc(%ebp),%eax 80483ca: 03 45 08 add 0x8(%ebp),%eax 80483cd: 5d pop %ebp 80483ce: c3 ret
Denison University
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T%5"55'1c+'<
Dump of assembler code for function sum:0x080483c4 <sum+0>: push %ebp0x080483c5 <sum+1>: mov %esp,%ebp0x080483c7 <sum+3>: mov 0xc(%ebp),%eax0x080483ca <sum+6>: add 0x8(%ebp),%eax0x080483cd <sum+9>: pop %ebp0x080483ce <sum+10>: ret
U+6'.&"6',T%5"55'1c+;
! [%6$%&,0<c,T'cA00'.gdb pdisassemble sum! VC696642>?4(3,-04./,4x/11xb sum
! `L92C*4(+84(&&(>5+46(6+9,1*H(9+(sum
Qch'#60x401040: 0x55 0x89 0xe5 0x8b 0x45 0x0c 0x03 0x45 0x08 0x5d 0xc3
Denison University
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[$"6,C"&,c',T%5"55'1c+'<j
! U&;6$%&0,6$"6,#"&,c',%&6'.=.'6'<,"5,'7'#A6"c+',#/<'! T%5"55'1c+'.,'7"1%&'5,c;6'5,"&<,.'#/&56.A#65,"55'1c+;,5/A.#'
% objdump -d WINWORD.EXE
WINWORD.EXE: file format pei-i386
No symbols in "WINWORD.EXE".Disassembly of section .text:
30001000 <.text>:30001000: 55 push %ebp30001001: 8b ec mov %esp,%ebp30001003: 6a ff push $0xffffffff30001005: 68 90 10 00 30 push $0x300010903000100a: 68 91 dc 4c 30 push $0x304cdc91
Denison University
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2&6'0'.,b'0%56'.5,D2UNKF
%eax%ecx%edx%ebx%esi%edi%esp%ebp
%ax
%cx
%dx
%bx
%si
%di
%sp
%bp
%ah
%ch
%dh
%bh
%al
%cl
%dl
%bl
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0'&'
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5'
accumulate
counter
data
base
source index
destinationindex
stack pointer
basepointer
Q.%0%&D1/56+;,/c5/+'6'F
Denison University
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!/*%&0,T"6"3,2UNK! !/*%&0,T"6"
movl*!"#$%&/*'&())
! Q='."&<,:;='5! *++&,-.)&/(!-*6+9*+(C*+4H4,(.9+9
! `L923?4'($0x400/*$-533! KC<4(!(0-*6+9*+B(>/+(3,4cL4.(=C+8(‘$’! `*0-.4.(=C+8(&B($B(-,(^(>5+46
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! 3&+"$4/(^(0-*640/1g4(>5+46(-G(242-,5(9+(9..,466(HCg4*(>5(,4HC6+4,! "C23?46+(4L923?4'((%eax)! k9,C-/6(-+84,(Y9..,466(2-.46[
%eax%ecx%edx%ebx%esi%edi%esp%ebp
Denison University
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movl,Q='."&<,C/1c%&"B/&5
:#**-'!;-!$%$-)9<$%$-)9!')#*+=%)!>,'?!#!+,*@A%!,*+')BCD-*
movl
E$$
F%@
.%$
F%@.%$
F%@.%$
F%@
E/A.#' T'56 C,U&"+/0
movl $0x4,%eax temp = 0x4;
movl $-147,(%eax) *p = -147;
movl %eax,%edx temp2 = temp1;
movl %eax,(%edx) *p = temp;
movl (%eax),%edx temp = *p;
E.#XT'56
Denison University
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E%1=+',!'1/.;,U<<.'55%&0,!/<'5! \/.1"+, DbF, !'1kb'0kbll
! b'0%56'.,b,5='#%W'5,1'1/.;,"<<.'55
movl (%ecx),%eax
! T%5=+"#'1'&6, TDbF, !'1kb'0kblmTl! b'0%56'.,b,5='#%W'5,56".6,/Z,1'1/.;,.'0%/&! C/&56"&6,<%5=+"#'1'&6,T,5='#%W'5,/^5'6
movl 8(%ebp),%edx
Denison University
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d5%&0,E%1=+',U<<.'55%&0,!/<'5
void swap(int *xp, int *yp) { int t0 = *xp; int t1 = *yp; *xp = t1; *yp = t0;}
4/<;
E'6d=
P%&%5$
swap: pushl %ebp movl %esp,%ebp pushl %ebx
movl 8(%ebp), %edx movl 12(%ebp), %ecx movl (%edx), %ebx movl (%ecx), %eax movl %eax, (%edx) movl %ebx, (%ecx)
popl %ebx popl %ebp ret
Denison University
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d5%&0,E%1=+',U<<.'55%&0,!/<'5
void swap(int *xp, int *yp) { int t0 = *xp; int t1 = *yp; *xp = t1; *yp = t0;}
4/<;
E'6d=
P%&%5$
swap: pushl %ebp movl %esp,%ebp pushl %ebx
movl 8(%ebp), %edx movl 12(%ebp), %ecx movl (%edx), %ebx movl (%ecx), %eax movl %eax, (%edx) movl %ebx, (%ecx)
popl %ebx popl %ebp ret
Denison University
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d&<'.56"&<%&0,ER"=
void swap(int *xp, int *yp) { int t0 = *xp; int t1 = *yp; *xp = t1; *yp = t0;}
E6"#?D%&,1'1/.;F
b'0%56'., e"+A'%edx xp%ecx yp%ebx t0%eax t1
yp
xp
b6&,"<.
Q+<,nebp %ebp 0
4
8
12
Q^5'6
ooo
Q+<,nebx-4 %esp
movl 8(%ebp), %edx # edx = xp movl 12(%ebp), %ecx # ecx = yp movl (%edx), %ebx # ebx = *xp (t0) movl (%ecx), %eax # eax = *yp (t1) movl %eax, (%edx) # *xp = t1 movl %ebx, (%ecx) # *yp = t0
Denison University
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d&<'.56"&<%&0,ER"=
0x120
0x124
b6&,"<.%ebp 0
4
8
12
Q^5'6
-4
123
456
U<<.'550x124
0x120
0x11c
0x118
0x114
0x110
0x10c
0x108
0x104
0x100
yp
xp
movl 8(%ebp), %edx # edx = xp movl 12(%ebp), %ecx # ecx = yp movl (%edx), %ebx # ebx = *xp (t0) movl (%ecx), %eax # eax = *yp (t1) movl %eax, (%edx) # *xp = t1 movl %ebx, (%ecx) # *yp = t0
%eax
%edx
%ecx
%ebx
%esi
%edi
%esp
%ebp 0x104
Denison University
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d&<'.56"&<%&0,ER"=
0x120
0x124
b6&,"<.%ebp 0
4
8
12
Q^5'6
-4
123
456
U<<.'550x124
0x120
0x11c
0x118
0x114
0x110
0x10c
0x108
0x104
0x100
yp
xp
movl 8(%ebp), %edx # edx = xp movl 12(%ebp), %ecx # ecx = yp movl (%edx), %ebx # ebx = *xp (t0) movl (%ecx), %eax # eax = *yp (t1) movl %eax, (%edx) # *xp = t1 movl %ebx, (%ecx) # *yp = t0
%eax
%edx
%ecx
%ebx
%esi
%edi
%esp
%ebp
0x124
0x104
Denison University
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d&<'.56"&<%&0,ER"=
0x120
0x124
b6&,"<.%ebp 0
4
8
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U<<.'550x124
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yp
xp
movl 8(%ebp), %edx # edx = xp movl 12(%ebp), %ecx # ecx = yp movl (%edx), %ebx # ebx = *xp (t0) movl (%ecx), %eax # eax = *yp (t1) movl %eax, (%edx) # *xp = t1 movl %ebx, (%ecx) # *yp = t0
%eax
%edx
%ecx
%ebx
%esi
%edi
%esp
%ebp
0x124
0x120
0x104
Denison University
32
d&<'.56"&<%&0,ER"=
0x120
0x124
b6&,"<.%ebp 0
4
8
12
Q^5'6
-4
123
456
U<<.'550x124
0x120
0x11c
0x118
0x114
0x110
0x10c
0x108
0x104
0x100
yp
xp
movl 8(%ebp), %edx # edx = xp movl 12(%ebp), %ecx # ecx = yp movl (%edx), %ebx # ebx = *xp (t0) movl (%ecx), %eax # eax = *yp (t1) movl %eax, (%edx) # *xp = t1 movl %ebx, (%ecx) # *yp = t0
%eax
%edx
%ecx
%ebx
%esi
%edi
%esp
%ebp
0x124
0x120
123
0x104
Denison University
33
d&<'.56"&<%&0,ER"=
0x120
0x124
b6&,"<.%ebp 0
4
8
12
Q^5'6
-4
123
456
U<<.'550x124
0x120
0x11c
0x118
0x114
0x110
0x10c
0x108
0x104
0x100
yp
xp
movl 8(%ebp), %edx # edx = xp movl 12(%ebp), %ecx # ecx = yp movl (%edx), %ebx # ebx = *xp (t0) movl (%ecx), %eax # eax = *yp (t1) movl %eax, (%edx) # *xp = t1 movl %ebx, (%ecx) # *yp = t0
%eax
%edx
%ecx
%ebx
%esi
%edi
%esp
%ebp
456
0x124
0x120
123
0x104
Denison University
34
d&<'.56"&<%&0,ER"=
0x120
0x124
b6&,"<.%ebp 0
4
8
12
Q^5'6
-4
456
456
U<<.'550x124
0x120
0x11c
0x118
0x114
0x110
0x10c
0x108
0x104
0x100
yp
xp
movl 8(%ebp), %edx # edx = xp movl 12(%ebp), %ecx # ecx = yp movl (%edx), %ebx # ebx = *xp (t0) movl (%ecx), %eax # eax = *yp (t1) movl %eax, (%edx) # *xp = t1 movl %ebx, (%ecx) # *yp = t0
%eax
%edx
%ecx
%ebx
%esi
%edi
%esp
%ebp
456
0x124
0x120
123
0x104
Denison University
35
d&<'.56"&<%&0,ER"=
0x120
0x124
b6&,"<.%ebp 0
4
8
12
Q^5'6
-4
456
123
U<<.'550x124
0x120
0x11c
0x118
0x114
0x110
0x10c
0x108
0x104
0x100
yp
xp
movl 8(%ebp), %edx # edx = xp movl 12(%ebp), %ecx # ecx = yp movl (%edx), %ebx # ebx = *xp (t0) movl (%ecx), %eax # eax = *yp (t1) movl %eax, (%edx) # *xp = t1 movl %ebx, (%ecx) # *yp = t0
%eax
%edx
%ecx
%ebx
%esi
%edi
%esp
%ebp
456
0x124
0x120
123
0x104
Denison University
36
C/1=+'6',!'1/.;,U<<.'55%&0,!/<'5!!/56,i'&'."+,P/.1, , TDbcXb%XEF, !'1kb'0kbclmEpb'0kb%lm,Tl
! V'(( !-*6+9*+(Y.C63?90424*+[(&B($B(-,(^(>5+46! N>'(( ;964(,4HC6+4,'(F*5(-G(%(C*+4H4,(,4HC6+4,6! NC'( )*.4L(,4HC6+4,'(F*5B(4L043+(G-,(%esp
! \*?C<4?5(5-/o.(/64(%ebpB(4C+84,! "'(( "09?4'(&B($B(^B(-,(%(O,-").-+/+)#0%1+2/3P
! E='#%"+,C"5'5, , DbcXb%F, !'1kb'0kbclmb'0kb%ll, , TDbcXb%F, !'1kb'0kbclmb'0kb%lmTl, , DbcXb%XEF, !'1kb'0kbclmEpb'0kb%ll
Denison University
37
T"6",b'=.'5'&6"B/&53,2UNK,m,789(9O! E%q'5,/Z,C,Qch'#65,D%&,4;6'5F!(((222252'.).2647&2 8&9&$-%2:;<=-)2 *9)&>2*?:;2 @AB<BC
! /*6CH*4.( ^( ^( ^! C*+( ^( ^( ^! ?-*H(C*+( ^( ^( %! 089,( &( &( &! 68-,+( $( $( $! Z-9+( ^( ^( ^! .-/>?4( %( %( %! ?-*H(.-/>?4( %( &@]&$( &A! 089,(p( ^( ^( %
4 52)$#")6.-+2)76&#.+2
Denison University
38
%rsp
789(9O,2&6'0'.,b'0%56'.5
! `L+4*.(4LC61*H(,4HC6+4,6:((F..(%(*4=(-*46:! I9<4(%ebp1%rbp*H4*4,9?(3/,3-64
%eax
%ebx
%ecx
%edx
%esi
%edi
%esp
%ebp
%r8d
%r9d
%r10d
%r11d
%r12d
%r13d
%r14d
%r15d
%r8
%r9
%r10
%r11
%r12
%r13
%r14
%r15
%rax
%rbx
%rcx
%rdx
%rsi
%rdi
%rbp
Denison University
39
2&56.A#B/&5! )/&0,R/.<,l,DO,4;6'5F,r,sA"<,R/.<,q,D8,4;6'5F
! \'R,%&56.A#B/&53! movl(!(movq! addl(!(addq! sall(!(salq! 4+0:
! NK(c%6,%&56.A#B/&5,6$"6,0'&'."6',NK(c%6,.'5A+65! "4+(8CH84,(-,.4,(>C+6(-G(.461*91-*(,4HC6+4,(+-(0! `L923?4'(addl
Denison University
40
NK(c%6,#/<',Z/.,5R"=
void swap(int *xp, int *yp) { int t0 = *xp; int t1 = *yp; *xp = t1; *yp = t0;}
4/<;
E'6d=
P%&%5$
swap: pushl %ebp movl %esp,%ebp pushl %ebx
movl 8(%ebp), %edx movl 12(%ebp), %ecx movl (%edx), %ebx movl (%ecx), %eax movl %eax, (%edx) movl %ebx, (%ecx)
popl %ebx popl %ebp ret
Denison University
41
9O(c%6,#/<',Z/.,5R"=
! Q='."&<5,="55'<,%&,.'0%56'.5,DR$;,A5'ZA+jF! SC,6+(OxpP(C*(%rdiB(640-*.(OypP(C*(%rsi! A^#>C+(3-C*+4,6
! \/,56"#?,/='."B/&5,.'tA%.'<! NK(c%6,<"6"! V9+9(84?.(C*(,4HC6+4,6(%eax(9*.(%edx! (movl(-34,91-*
void swap(int *xp, int *yp) { int t0 = *xp; int t1 = *yp; *xp = t1; *yp = t0;}
4/<;
E'6d=
P%&%5$
swap:
movl (%rdi), %edx movl (%rsi), %eax movl %eax, (%rdi) movl %edx, (%rsi) ret
Denison University
42
9O(c%6,#/<',Z/.,+/&0,%&6,5R"=
! 9O(c%6,<"6"! V9+9(84?.(C*(,4HC6+4,6(%rax(9*.(%rdx! (movq(-34,91-*
! Yf[(6+9*.6(G-,(f/9.#=-,.
void swap(long *xp, long *yp) { long t0 = *xp; long t1 = *yp; *xp = t1; *yp = t0;}
4/<;
E'6d=
P%&%5$
swap_l:
movq (%rdi), %rdx movq (%rsi), %rax movq %rax, (%rdi) movq %rdx, (%rsi)
ret
Denison University
43
!"#$%&',-./0."11%&0,23,EA11".;! _%56/.;,/Z,2&6'+,=./#'55/.5,"&<,".#$%6'#6A.'5
! `g-?/1-*9,5(.46CH*(?49.6(+-(29*5(f/C,<6(9*.(9,1G90+6! CX,"55'1c+;X,1"#$%&',#/<'
! !-23C?4,(2/6+(+,9*6G-,2(6+9+424*+6B(4L3,466C-*6B(3,-04./,46(C*+-(?-=#?4g4?(C*6+,/01-*(64f/4*046
! U55'1c+;,4"5%#53,b'0%56'.5X,/='."&<5X,1/*'! 784(L%A(2-g4(C*6+,/01-*6(0-g4,(=C.4(,9*H4(-G(.9+9(2-g424*+(
G-,26! 2&6./,6/,789(9O
! F(29Q-,(.439,+/,4(G,-2(+84(6+5?4(-G(0-.4(644*(C*()FX$