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> Compiler Internals > Is it bug? |
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CandyMan 18 Nov 2011, 22:01
format ELF
use16 Dest: jnz Dest error: address sizes do not agree |
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18 Nov 2011, 22:01 |
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DOS386 19 Nov 2011, 08:07
Your BUG and bad error message from FASM. There is no 16-bit ELF, only 32-bit and 64-bit
 It should break already at "use16" 
Try also: Code: use16 mov [cx], ax PS: please fix (CandyMan) the subject (I can't edit other people's posts in this subforum) PPSS: probably "use16" should be explicitly prohibited in any format except binary and MZ ... see FORMATS.INC line 686 and fix (Tomasz) this one too |
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19 Nov 2011, 08:07 |
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ouadji 19 Nov 2011, 09:20
How to do this Tomasz ? (where is my error ?)  _________________ I am not young enough to know everything (Oscar Wilde)-  |
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19 Nov 2011, 09:20 |
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DOS386 19 Nov 2011, 09:25
RTFF
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19 Nov 2011, 09:25 |
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Tomasz Grysztar 20 Nov 2011, 00:47
Neither allowing 16-bit code inside ELF object is a bug (as you may want to have 16-bit code inside 32-bit file, as Fanael wrote), and neither is an error signalized when it is not possible to generate relocation to 32-bit address for a 16-bit instruction, which can contain only 16-bit one (and that's why you get the "address sizes do not agree" message).
Code: format ELF use16; this changes code generation, but not ORG Dest: ; so we still use 32-bit relocatable ORG, and "Dest" address jnz Dest ; needs 32-bit relocation and thus can not be used in such instruction Code: format ELF use16 org 100h ; now we state that this piece of 16-bit code will get loaded at address 100h Dest: jnz Dest ; and it works |
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20 Nov 2011, 00:47 |
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ouadji 20 Nov 2011, 01:06
and about this, i don't understand why it does not compile. where is my error Tomasz ? Thank you. Code: use16 mov [cx],ax ;reserved word used as symbol (??) _________________ I am not young enough to know everything (Oscar Wilde)- |
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20 Nov 2011, 01:06 |
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Tomasz Grysztar 20 Nov 2011, 01:14
"cx" is not one of registers that can be used for addressing in 16-bit mode. This strange message comes from the fact that after not finding any addressing register of that name, fasm tries to use it as a label name, but fails because it is a reserved word - it is like if you tried to assemble "mov [mov],ax" for example.
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20 Nov 2011, 01:14 |
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ouadji 20 Nov 2011, 01:53
Quote: "cx" is not one of registers that can be used for addressing in 16-bit mode. of course! ... on this one, I'm an half-wit. 
Code: use16 mov [bx],ax _________________ I am not young enough to know everything (Oscar Wilde)- |
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20 Nov 2011, 01:53 |
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