我尝试从输入中读取字符两次,第一次“调用getUserAction”工作正常,但主要问题是,系统没有调用第二个读取函数,它只是退出。这是我的代码的一小部分
SECTION .bss
buffer resb 1
SECTION .text
global _start
_start:
...some unuseful and commented code
call getUserAction ;reading 1 byte from console, works fine
...
jmp count
call exit
count:
...
call getUserAction; don't work, just exits from program without err
...commented code to debug
call exit
getUserAction: ;proc to read from console 1 byte
mov eax, 3
mov ebx, 0
mov ecx, buffer
mov edx, 1
int 80h
ret
此外,我试图将getUserAction中的代码放入“count”proc中,但它什么都没改变。
UPD:对第一条评论的回答: 在第二个“getUserAction”之后:
mov eax, [buffer]
cmp eax, 'u'
je setUsersValues
cmp eax, 'e'
je callFunc
call exit
UPD2 :我很抱歉,这是所有代码
%define newline 10,0
%define A1 -7
%define A2 3
%define A3 2
%define A4 4
%define A5 2
SECTION .data
labInfo db "============Lab_3============",newline
labInfoLen equ $ - labInfo
mainMenu db "Choose the ex:",newline,\
" r - call count",newline,\
" t - call beep", newline,\
" y - call exit func",newline
mainMenuLen equ $ - mainMenu
funcStr db "Here func func func", newline
funcStrLen equ $ - funcStr
countPromt db "Please,choose the variant of variables value",newline,\
" u - user defined values", newline,\
" e - execerciese defined values", newline,\
"Your choise:"
promtLen equ $ - countPromt
SECTION .bss
buffer resb 1
resultValue resb 1
%macro calculateFunc 5
push eax
push edx
push ecx
mov eax, %1
mov ecx, %2
add eax, ecx
mov ecx, %3
imul ecx
mov ecx, %4
xor edx, edx
idiv ecx
mov ecx, %5
add eax, ecx
mov [resultValue], eax
pop ecx
pop edx
pop eax
%endmacro
SECTION .text
global _start
_start:
;call showPromt
push labInfo
push labInfoLen
call printStr
add esp, 8
;call showVarsList
push mainMenu
push mainMenuLen
call printStr
add esp, 8
call getUserAction
;get get get action
mov eax, [buffer]
cmp eax, 'r'
je count
cmp eax, 't'
je beep
cmp eax, 'y'
je exit
jmp _start
count:
;showFuncInfo
push funcStr
push funcStrLen
call printStr
add esp, 8
;showProposal
push countPromt
push promtLen
call printStr
add esp, 8
call getUserAction
mov eax, [buffer]
cmp eax, 'u'
je setUsersValues
cmp eax, 'e'
je callFunc
call exit
ret
setUsersValues:
nop; add some code later
ret
callFunc:
calculateFunc A1,A2,A3,A4,A5
add byte [resultValue], '0'
push resultValue
push 1
call printStr ; print Result
add esp, 8
ret
printStr:
push ebp
mov ebp, esp
mov eax, 4
mov ebx, 1
mov ecx, [ebp+12]
mov edx, [ebp+8]
int 80h
pop ebp
ret
getUserAction:
mov eax, 3
mov ebx, 0
mov ecx, buffer
mov edx, 1
int 80h
ret
beep:
nop;add some code later
ret
exit:
mov eax, 1
xor ebx, ebx
int 80h
答案 0 :(得分:0)
没有看到所有代码,你的缓冲区至少应该是2个字节。 sys_read和sys_write的大小应该是2而不是1。