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flat assembler > Linux > elf64 value out of range

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funggong



Joined: 08 Nov 2016
Posts: 6
Code:
format elf64 executable at 0x4000000000 as 'sys'
start:
cmp rdi,start

cmp rdi,start
error: value out of range.

    


anyone can tell me why this happened?
Post 08 Nov 2016, 08:46
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 15913
Location: SDSS J140821.67+025733.2
The cmp instruction cannot support large immediate values >=2^31. It is a limitation of the x86-64 CPU.

To fix this you can use either lea for RIP relative offsets to "start", or use mov to get the absolute address (but this makes your code non-relocatable).


Last edited by revolution on 08 Nov 2016, 08:55; edited 1 time in total
Post 08 Nov 2016, 08:51
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funggong



Joined: 08 Nov 2016
Posts: 6
revolution wrote:
The cmp instruction cannot support large immediate values >=2^31. It is a limitation of the x86-64 CPU.

To fix this you can use either lea for RIP relative offsets to "start", or use mov to get the absolute address (but this makes your code non-relocatable).


thank you very much.
Post 08 Nov 2016, 09:05
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