Messages in this thread | | | Date | Wed, 23 Apr 2003 09:02:08 -0400 | From | Chuck Ebbert <> | Subject | Re: Wanted: A decent assembler |
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"Richard B. Johnson" wrote"
>> Output from 'make bzImage' after making some changes: >> >> Error: non-constant expression in ".if" statement. >> >> >> Why is the kernel using a 1-pass assembler? >> > > Well it isn't. The AT&T clone assembler will resolve forward > references and it does it by using as many passes as necessary. > It even has a 'reasonable' MACRO capability. I use it quite a > bit to minimize the code-size or to maximize performance in > embedded systems.
This is from the info for GNU as:
"The result of an expression must be an absolute number, or else an offset into a particular section. If an expression is not absolute, and there is not enough information when `as' sees the expression to know its section, a second pass over the source program might be necessary to interpret the expression--but the second pass is currently not implemented. `as' aborts with an error message in this situation."
> Your error shown above is a real error. If you expose the code > that it barfed on, maybe somebody could help you fix the code.
if NR_IRQS gt 16 # only build this for IO-APIC .align 8,0x90 # make ENTRY have exact address irq_align=8 # start with 8-byte alignment ENTRY(high_irq_entries_start) rept NR_IRQS-16 # the rest of the stubs .align irq_align,0x90 1: pushl $vector-256 # 5-byte instruction jmp common_interrupt # 2 or 5 bytes (8 or 32-bit offset) 2: if 2b-1b > 8 # <============================= ERROR irq_align=16 # switch to 16-byte alignment endif data .long 1b text vector=vector+1 endr endif
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