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編譯一個簡單的 c 代碼：
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int a= 123;
int b[] = {1, 2, 3, 4};
char ch[] = "AAAAAA";
int main(void)
{
int a = 456;
int b[] = {5, 6, 7, 8};
char ch[] = "aaaaaa";
return 0;
}
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先在debian5.0上用gcc4.3.2編：
gcc -Wall -S -O0 1.c -o app_gcc.S
--------------------------------------------------------------------------------------
.file "1.c"
.globl a
.data
.align 4
.type a, @object
.size a, 4
a:
.long 123
.globl b
.align 4
.type b, @object
.size b, 16
b:
.long 1
.long 2
.long 3
.long 4
.globl ch
.type ch, @object
.size ch, 7
ch:
.string "AAAAAA"
.text
.globl main
.type main, @function
main:
leal 4(%esp), %ecx
andl $-16, %esp
pushl -4(%ecx)
pushl %ebp
movl %esp, %ebp
pushl %ecx
subl $32, %esp
movl $456, -8(%ebp)
movl $5, -24(%ebp)
movl $6, -20(%ebp)
movl $7, -16(%ebp)
movl $8, -12(%ebp)
movl $1633771873, -31(%ebp)
movw $24929, -27(%ebp)
movb $0, -25(%ebp)
movl $0, %eax
addl $32, %esp
popl %ecx
popl %ebp
leal -4(%ecx), %esp
ret
.size main, .-main
.ident "GCC: (Debian 4.3.2-1.1) 4.3.2"
.section .note.GNU-stack,"",@progbits
--------------------------------------------------------------------------------------
在win xp上用arm-elf-gcc編。
arm-elf-gcc -Wall -S -O0 1.c -o app_armgcc.s
--------------------------------------------------------------------------------------
.file "1.c"
.global a
.data
.align 2
.type a, %object
.size a, 4
a:
.word 123
.global b
.align 2
.type b, %object
.size b, 16
b:
.word 1
.word 2
.word 3
.word 4
.global ch
.align 2
.type ch, %object
.size ch, 7
ch:
.ascii "AAAAAA\000"
.section .rodata
.align 2
.type C.0.1181, %object
.size C.0.1181, 16
C.0.1181:
.word 5
.word 6
.word 7
.word 8
.align 2
.LC0:
.ascii "aaaaaa\000"
.text
.align 2
.global main
.type main, %function
main:
@ args = 0, pretend = 0, frame = 28
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #28
mov r3, #456
str r3, [fp, #-16]
ldr r3, .L3
sub ip, fp, #32
ldmia r3, {r0, r1, r2, r3}
stmia ip, {r0, r1, r2, r3}
ldr r3, .L3+4
sub r2, fp, #39
mov ip, #7
mov r0, r2
mov r1, r3
mov r2, ip
bl memcpy
mov r3, #0
mov r0, r3
sub sp, fp, #12
ldmfd sp, {fp, sp, pc}
.L4:
.align 2
.L3:
.word C.0.1181
.word .LC0
.size main, .-main
.ident "GCC: (GNU) 4.3.2"
--------------------------------------------------------------------------------------
在win xp上用armcc編。
armcc -S -O0 1.c -o app_armcc.s
--------------------------------------------------------------------------------------
; generated by ARM C Compiler, ADS1.2 [Build 805]
; commandline [-O0 -S "-IC:\Program Files\ARM\ADSv1_2\INCLUDE"]
CODE32
AREA ||.text||, CODE, READONLY
main PROC
|L1.0|
STR lr,[sp,#-4]!
SUB sp,sp,#0x18
MOV lr,#0x1c8
LDR r1,|L1.60|
ADD r0,sp,#8
LDMIA r1,{r1-r3,r12}
STMIA r0,{r1-r3,r12}
LDR r0,|L1.64|
LDR r1,[r0,#0] ; ,
LDR r0,[r0,#4]
STR r0,[sp,#4]
STR r1,[sp,#0]
MOV r0,#0
ADD sp,sp,#0x18
LDR pc,[sp],#4
|L1.60|
DCD ||.constdata$1||
|L1.64|
DCD ||.constdata$1|| + 16
ENDP
AREA ||.data||, DATA, ALIGN=2
||.data$0||
a
DCD 0x0000007b
b
DCD 0x00000001
DCD 0x00000002
DCD 0x00000003
DCD 0x00000004
||ch||
DCB 0x41,0x41,0x41,0x41
DCB 0x41,0x41,0x00
DCB 0x00
AREA ||.constdata||, DATA, READONLY, ALIGN=2
||.constdata$1||
DCD 0x00000005
DCD 0x00000006
DCD 0x00000007
DCD 0x00000008
DCB 0x61,0x61,0x61,0x61
DCB 0x61,0x61,0x00
DCB 0x00
EXPORT main
EXPORT ||ch||
EXPORT b
EXPORT a
IMPORT _main
IMPORT __main
IMPORT ||Lib$Request$armlib||, WEAK
KEEP ||BuildAttributes$ARM_ISAv4$M$PE$A:L22$X:L11$S22$~IW$USESV6$~STKCKD$USESV7$~SHL$OSPACE$PRES8||
||BuildAttributes$ARM_ISAv4$M$PE$A:L22$X:L11$S22$~IW$USESV6$~STKCKD$USESV7$~SHL$OSPACE$PRES8|| EQU 0
ASSERT {ENDIAN} = "little"
ASSERT {SWST} = {FALSE}
ASSERT {NOSWST} = {TRUE}
ASSERT {INTER} = {FALSE}
ASSERT {ROPI} = {FALSE}
ASSERT {RWPI} = {FALSE}
ASSERT {NOT_SHL} = {TRUE}
ASSERT {FULL_IEEE} = {FALSE}
ASSERT {SHL1} = {FALSE}
ASSERT {SHL2} = {FALSE}
END
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