Calling sys_read two times [Nasm, Linux] - linux

Question

Twice i try to read character from input, the first time "call getUserAction" works fine, but the main problem is, that the system didn't call the second read func, it just exits. Here is a little part of my code
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
Also i tried to put code from getUserAction in "count" proc, but it changes nothing.
UPD: Answer on first comment:
After the second "getUserAction":
mov eax, [buffer]
cmp eax, 'u'
je setUsersValues
cmp eax, 'e'
je callFunc
call exit
UPD2: I'm so sorry, here is all code
%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

Answer 1

without seeing all the code, your buffer should be at least 2 bytes. the size for both sys_read and sys_write should be 2 not 1.