binutils/gas problem with 'lcall'
arch/i386/kernel/apm.c and pci-pc.c use the lcall instruction (call far indirect) for invoking BIOS services.
The following syntax is used:
(apm) lcall %cs:apm_bios_entry
(pci-pc) lcall (%edi)
This works ok with binutils 2.9.5, but binutils 2.10.0.18 (gas 2.10.90) as shipped with RedHat 7.0 complains:
Warning: indirect lcall without `*'
To keep gas 2.10.90 happy one can insert the * prefix:
(apm) lcall *%cs:apm_bios_entry
(pci-pc) lcall *(%edi)
but older binutils like 2.9.5 treat these as syntax errors. Sigh.
So how do we want to handle this?
- ignore the warnings? (yuck; I hate compiler/assembler warnings)
- specify 2.10.0.18 as the minimum binutils for 2.4 kernels? if we're going to do it, we should do it NOW, before the real 2.4.0 is released
/Mikael
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Quoted 4 lines
but older binutils like 2.9.5 treat these as syntax errors. Sigh.
So how do we want to handle this?
- ignore the warnings? (yuck; I hate compiler/assembler warnings)
Correct ;)
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