116 lines
3.8 KiB
Plaintext
116 lines
3.8 KiB
Plaintext
This chapter describes the AmigaOS hunk-format output module which can be
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selected with the @option{-Fhunk} option to generate objects and with the
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@option{-Fhunkexe} option to generate executable files.
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@section Legal
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This module is written in 2002-2019 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 -hunkpad=<code>
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Sets a two-byte code used for aligning a code hunk to the
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next 32-bit border. Defaults to 0x4e71 on M68k to allow linking
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of functions which extend over two object files.
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@item -keepempty
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Do not delete empty sections without any symbol definition.
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@item -kick1hunks
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Use only those hunk types and external reference types which have
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been valid at the time of Kickstart 1.x for compatibility with
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old assembler sources and old linkers. For example: no longer
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differentiate between absolute and relative references.
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In executables it will prevent the assembler from using
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16-bit relocation offsets in hunks and rejects 32-bit PC-relative
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relocations.
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@item -linedebug
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Automatically generate an SAS/C-compatible LINE DEBUG hunk for
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the input source. Overrides any line debugging directives from
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the source.
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@end table
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These options are valid for the @code{hunkexe} module only:
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@table @option
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@item -databss
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Try to shorten sections in the output file by removing zero words
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without relocation from the end. This technique is only supported
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by AmigaOS 2.0 and higher.
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@end table
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@section General
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This output module outputs the @code{hunk} object (standard for @code{M68k}
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and extended for @code{PowerPC}) and @code{hunkexe} executable format, which
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is a proprietary file format used by AmigaOS and WarpOS.
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The @code{hunkexe} module will generate directly executable files, without
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the need for another linker run. But you have to make sure that there are
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no undefined symbols, common symbols, or unusual relocations (e.g. small
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data) left.
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It is allowed to define sections with the same name but different
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attributes. They will be regarded as different entities.
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@section Restrictions
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The @code{hunk}/@code{hunkexe} output format is only intended for @code{M68k}
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and @code{PowerPC} cpu modules and will abort when used otherwise.
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The @code{hunk} module supports the following relocation types:
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@itemize @minus
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@item absolute, 32-bit
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@item absolute, 16-bit
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@item absolute, 8-bit
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@item relative, 8-bit
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@item relative, 14-bit (mask 0xfffc) for PPC branch instructions.
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@item relative, 16-bit
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@item relative, 24-bit (mask 0x3fffffc) for PPC branch instructions.
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@item relative, 32-bit
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@item base-relative, 16-bit
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@item common symbols are supported as 32-bit absolute and relative
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references
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@end itemize
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The @code{hunkexe} module supports absolute 32-bit relocations only.
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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 The @code{hunkexe} module won't process common symbols and allocate
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them in a @code{BSS} section. Use a real linker for that.
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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 3001: multiple sections not supported by this format
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@item 3002: output module doesn't support cpu <name>
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@item 3003: write error
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@item 3004: section attributes <attr> not supported
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@item 3005: reloc type <m>, size <n>, mask <mask> (symbol <sym> + <offset>) not supported
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@item 3006: reloc type <n> not supported
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@item 3009: undefined symbol <%s> at %s+0x%lx, reloc type %d
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@item 3010: section <%s>: alignment padding (%lu) not a multiple of %lu at 0x%llx
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@item 3011: weak symbol <%s> not supported by output format, treating as global
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@item 3014: data definition following a databss space directive
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@end itemize
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