63 lines
1.8 KiB
Plaintext
63 lines
1.8 KiB
Plaintext
This chapter describes the a.out output module which can be
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selected with the @option{-Faout} option.
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@section Legal
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This module is written in 2008-2012 by Frank Wille and
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is covered by the vasm copyright without modifications.
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@section Additional options for this module
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@table @option
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@item -mid=<machine id>
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Sets the MID field of the a.out header to the specified value.
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The MID defaults to 2 (Sun020 big-endian) for M68k and to 100
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(PC386 little-endian) for x86.
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@end table
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@section General
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This output module outputs the @code{a.out} (assembler output)
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format, which is an older 32-bit format for Unix-like operating systems,
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originally invented by AT&T.
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@section Restrictions
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The @code{a.out} output format, as implemented in vasm, currently supports
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the following architectures:
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@itemize @minus
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@item M68k
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@item i386
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@end itemize
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The following standard relocations are supported by default:
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@itemize @minus
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@item absolute, 8, 16, 32 bits
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@item pc-relative, 8, 16, 32 bits
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@item base-relative
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@end itemize
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Standard relocations occupy 8 bytes and don't include an addend, so they
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are not suitable for most RISC CPUs. The extended relocations format occupies
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12 bytes and also allows more relocation types.
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@section Known Problems
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Some known problems of this module at the moment:
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@itemize @minus
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@item Support for stab debugging symbols is still missing.
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@item The extended relocation format is not supported.
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@end itemize
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@section Error Messages
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This module has the following error messages:
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@itemize @minus
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@item 3004: section attributes <attr> not supported
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@item 3008: output module doesn't allow multiple sections of the same type
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@item 3010: section <%s>: alignment padding (%lu) not a multiple of %lu at 0x%llx
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@end itemize
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