So basically learning y86 here. I have this C code and im trying to translate to y86 assembly. I keep getting this error:
PC = 0x2058a090, Invalid instruciton address
Stopped in 2 steps at PC = 0x2058a090. Exception 'ADR', CC Z=1, S=0, O=0
Changes to registers:
%esp: 0x00000000 0x00000004
changes to memory:
And basically im trying to translate this c code:
int main(){
int i, j;
i = 0;
j = 0;
if(i>j){
i=i+5;
}
else{
i = 0;
j++;
}
}
To Y86 code:
main:
pushl %ebp
rrmovl %esp, %ebp
mrmovl 2(%ebp), %esi #esi = 1
mrmovl 4(%ebp), %ecx #ecx = i
mrmovl 8(%ebp), %edx #edx = j
mrmovl 12(%ebp), %ebx #ebx = 5
irmovl $1, %esi
irmovl $0, %ecx # i = 0 (ecx)
irmovl $0, %edx # j = 0 (edx
irmovl $5, %ebx
subl %edx, %ecx
irmovl $0, %ecx
jg L4
L2: #else statement
irmovl $0, %ecx #i = 0
addl %esi, %edx
rmmovl %edx, 8(%ebp) #new value of j to j memory
rmmovl %ecx, 4(%ebp) #new value of i to i memory
je End
L4: #if statement
addl %ebx, %ecx #add 5(ebx) to i(ecx)
rmmovl %ecx, 4(%ebp) #assign new value of i
je End
End:
rrmovl %ebp, %esp
popl %ebp
ret
can anyone tell me where the error is coming from? I know ADR means that the program is trying to write or read from an invalid memory address. Thanks!
Seems your stack is not properly setup, so you need to initialize ESP first and make sure that the ret after the function is finished, is jumping somehwere which can terminate the program.
In your error you can see that esp = 0