0x80000000: "value out of range" in 64-bit mode.

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magicSqr

Joined: 27 Aug 2011
Posts: 105

magicSqr 09 Aug 2012, 22:33

I'm using the following

Code:

format PE64 console
entry start

include '%fasminc%\win64ax.inc'

section '.text' code readable executable

    start:
        add     rax, 0x080000000
        invoke  ExitProcess

;*************************************
section '.idata' import data readable writeable

library kernel32, 'kernel32.dll'
include '%fasminc%\api\Kernel32.inc'

and get a 'value out of range' error.

09 Aug 2012, 22:33

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20309
Location: In your JS exploiting you and your system

revolution 09 Aug 2012, 22:45

Indeed. 0x800000000 is 2^35. The x86 encoding mechanism for immediate values only allows 32-bit signed values with ADD in 64-bit mode.

09 Aug 2012, 22:45

magicSqr

Joined: 27 Aug 2011
Posts: 105

magicSqr 09 Aug 2012, 22:49

Thanks revolution.

I actually put too many zeroes in my OP, it's

add rax, 0x080000000

i.e. a 32-bit number, although as a signed it is negative.

I'll just use

add rax, 0x7FFFFFFF
inc rax

or else place the value in memory and add it from there

09 Aug 2012, 22:49

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20309
Location: In your JS exploiting you and your system

revolution 10 Aug 2012, 00:54

Or you can use MOV.

Code:

mov rcx,0x123456789abcdef0
add rax,rcx

10 Aug 2012, 00:54

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 10 Aug 2012, 15:32

Code:

sub     rax, -0x080000000

10 Aug 2012, 15:32

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