[英]Assembly error when compiling with GCC
使用此命令編譯.s文件時,出現“無此指令”錯誤:
$ gcc -s -o scall scall.s
scall.s: Assembler messages:
scall.s:2: Error: no such instruction: `section '
scall.s:4: Error: no such instruction: `global _start'
scall.s:7: Error: unsupported instruction `mov'
scall.s:8: Error: unsupported instruction `mov'
scall.s:11: Error: operand size mismatch for `int'
scall.s:13: Error: no such instruction: `section .data'
scall.s:15: Error: no such instruction: `msglength .word 12'
這是文件的代碼:
section .text
global _start
_start:
mov 4,%eax
mov 1,%ebx
mov $message,%ecx
mov $msglength,%edx
int $0x80
section .data
message: .ascii "Hello world!"
msglength .word 12
如何擺脫錯誤?
我認為以下代碼將進行編譯(默認情況下,“ gcc”可以編譯.s和.S文件並將其鏈接到C庫,但是“ as”執行相同的操作,並且不將代碼與C庫鏈接)為:
.section .text
.global _start
_start:
mov $4,%eax
mov $1,%ebx
mov $message,%ecx
mov msglength,%edx
int $0x80
mov $1, %eax
mov $0, %ebx
int $0x80
.section .data
message: .ascii "Hello world!"
msglength: .word 12
GCC:
.section .text
.global main
main:
mov $4,%eax
mov $1,%ebx
mov $message,%ecx
mov msglength,%edx
int $0x80
mov $1, %eax
mov $0, %ebx
int $0x80
.section .data
message: .ascii "Hello world!"
msglength: .word 12
如下進行更正並使用-c參數gcc -c test.s -o test
編譯
.text
_start:
.global main
main:
mov 4,%eax
mov 1,%ebx
mov $message,%ecx
mov $msglength,%edx
int $0x80
.data
message: .ascii "Hello world!"
msglength: .word 12
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