Help/Support Breakpoint doesn't hit when enemy attacks

Ted2 · September 7, 2017

Hey,

So I've found one hit kill, problem is it's linked.

I know I'll need to set breakpoints, but the breakpoints doesn't hit when I get hit by enemy. Only when I hit a enemy.

I'm not sure what I can do next to unlink, anyone does?

This is the code;

loc_495852
LDR             R6, [SP,#0xA8+var_58]
VLDR            D8, =100.0
LDR             R5, [R6,#0x14]
LDR             R0, [SP,#0xA8+var_58]
VMOV            S2, R5
VLDR            S0, [R0,#0x18]
VCVT.F64.S32    D16, S2
VCVT.F64.S32    D17, S0
VDIV.F64        D16, D16, D17
VMUL.F64        D16, D16, D8
VMOV            R0, R1, D16
BLX.W           j__ceil
VMOV            D16, R0, R1
MOV.W           R0, #0xFFFFFFFF
SUBS            R1, R5, R4 <----> R4 to r7 = ONE HIT KILL, why: R4 = damage & r5 = current health
MOV             R2, R5 <-----> R5 to R8 = die, why: R5 = current health, r8 holds the value of 0
VCVTR.S32.F64   S0, D16
MOVS            R3, #0
VSTR            S0, [SP,#0xA8+var_54]
STR             R0, [SP,#0xA8+var_48]
MOVS            R0, #0
BL.W            sub_CD6928
STR             R0, [R6,#0x14]
CMP             R0, #0
BGT             loc_4958FC

Updated September 7, 2017 by Ted2
Added my code

Goran · September 7, 2017

7 minutes ago, Ted2 said:

Hey,

So I've found one hit kill, problem is it's linked.

I know I'll need to set breakpoints, but the breakpoints doesn't hit when I get hit by enemy. Only when I hit a enemy.

I'm not sure what I can do next to unlink, anyone does?

some game cant be unlinked.....

Ted2 · September 7, 2017

3 minutes ago, Goran said:

some game cant be unlinked.....

iknow, ain't wait I ask.

Ted2 · September 7, 2017

Added the code of IDA

Ted2 · September 7, 2017

@Mr Cub3s

K_K · September 7, 2017

57 minutes ago, Ted2 said:

Hey,

So I've found one hit kill, problem is it's linked.

I know I'll need to set breakpoints, but the breakpoints doesn't hit when I get hit by enemy. Only when I hit a enemy.

I'm not sure what I can do next to unlink, anyone does?

This is the code;


loc_495852
LDR             R6, [SP,#0xA8+var_58]
VLDR            D8, =100.0
LDR             R5, [R6,#0x14]
LDR             R0, [SP,#0xA8+var_58]
VMOV            S2, R5
VLDR            S0, [R0,#0x18]
VCVT.F64.S32    D16, S2
VCVT.F64.S32    D17, S0
VDIV.F64        D16, D16, D17
VMUL.F64        D16, D16, D8
VMOV            R0, R1, D16
BLX.W           j__ceil
VMOV            D16, R0, R1
MOV.W           R0, #0xFFFFFFFF
SUBS            R1, R5, R4 <----> R4 to r7 = ONE HIT KILL, why: R4 = damage & r5 = current health
MOV             R2, R5 <-----> R5 to R8 = die, why: R5 = current health, r8 holds the value of 0
VCVTR.S32.F64   S0, D16
MOVS            R3, #0
VSTR            S0, [SP,#0xA8+var_54]
STR             R0, [SP,#0xA8+var_48]
MOVS            R0, #0
BL.W            sub_CD6928
STR             R0, [R6,#0x14]
CMP             R0, #0
BGT             loc_4958FC

Use the backtrace feature or bt that will give you a list which you'd have to go through to find the function

Ted2 · September 7, 2017

Just now, K_K said:

Use the backtrace feature or bt that will give you a list which you'd have to go through to find the function

But the breakpoint doesn't get hit when I get damaged, while when change the code it does . So when I do BT, I can't compare the enemy output with mine

K_K · September 7, 2017

3 minutes ago, Ted2 said:

But the breakpoint doesn't get hit when I get damaged, while when change the code it does . So when I do BT, I can't compare the enemy output with mine

It works when you hit enemy?...

Ted2 · September 7, 2017

16 minutes ago, K_K said:

It works when you hit enemy?...

yes, the breakpoint gets hit & game freezes.

When I get hit, breakpoint doesn't get hit & doesn't freeze.

When I change the code, like I wrote. It apparently is my health function too, so I find it strange

Goran · September 7, 2017

1 minute ago, Ted2 said:

yes, the breakpoint gets hit & game freezes.

When I get hit, breakpoint doesn't get hit & doesn't freeze.

When I change the code, like I wrote. It apparently is my health function too, so I find it strange

you need to check places where is goes in ida to compare.... and then try that to watch....