207 lines
4.6 KiB
Text
207 lines
4.6 KiB
Text
@c Copyright 2000, 2001 Free Software Foundation, Inc.
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@c This is part of the GAS manual.
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@c For copying conditions, see the file as.texinfo.
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@ifset GENERIC
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@page
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@node ARC-Dependent
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@chapter ARC Dependent Features
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@end ifset
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@ifclear GENERIC
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@node Machine Dependencies
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@chapter ARC Dependent Features
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@end ifclear
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@set ARC_CORE_DEFAULT 6
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@cindex ARC support
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@menu
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* ARC Options:: Options
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* ARC Syntax:: Syntax
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* ARC Floating Point:: Floating Point
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* ARC Directives:: ARC Machine Directives
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* ARC Opcodes:: Opcodes
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@end menu
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@node ARC Options
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@section Options
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@cindex ARC options (none)
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@cindex options for ARC (none)
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@table @code
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@cindex @code{-marc[5|6|7|8]} command line option, ARC
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@item -marc[5|6|7|8]
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This option selects the core processor variant. Using
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@code{-marc} is the same as @code{-marc@value{ARC_CORE_DEFAULT}}, which
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is also the default.
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@table @code
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@cindex @code{arc5} arc5, ARC
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@item arc5
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Base instruction set.
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@cindex @code{arc6} arc6, ARC
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@item arc6
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Jump-and-link (jl) instruction. No requirement of an instruction between
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setting flags and conditional jump. For example:
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@smallexample
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mov.f r0,r1
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beq foo
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@end smallexample
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@cindex @code{arc7} arc7, ARC
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@item arc7
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Break (brk) and sleep (sleep) instructions.
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@cindex @code{arc8} arc8, ARC
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@item arc8
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Software interrupt (swi) instruction.
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@end table
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Note: the @code{.option} directive can to be used to select a core
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variant from within assembly code.
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@cindex @code{-EB} command line option, ARC
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@item -EB
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This option specifies that the output generated by the assembler should
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be marked as being encoded for a big-endian processor.
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@cindex @code{-EL} command line option, ARC
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@item -EL
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This option specifies that the output generated by the assembler should
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be marked as being encoded for a little-endian processor - this is the
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default.
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@end table
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@node ARC Syntax
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@section Syntax
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@menu
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* ARC-Chars:: Special Characters
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* ARC-Regs:: Register Names
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@end menu
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@node ARC-Chars
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@subsection Special Characters
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@cindex ARC special characters
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@cindex special characters, ARC
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*TODO*
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@node ARC-Regs
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@subsection Register Names
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@cindex ARC register names
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@cindex register names, ARC
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*TODO*
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@node ARC Floating Point
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@section Floating Point
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@cindex floating point, ARC (@sc{ieee})
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@cindex ARC floating point (@sc{ieee})
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The ARC core does not currently have hardware floating point
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support. Software floating point support is provided by @code{GCC}
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and uses @sc{ieee} floating-point numbers.
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@node ARC Directives
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@section ARC Machine Directives
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@cindex machine directives, ARC
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@cindex ARC machine directives
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The ARC version of @code{@value{AS}} supports the following additional
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machine directives:
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@table @code
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@cindex @code{2byte} directive, ARC
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@item .2byte @var{expressions}
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*TODO*
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@cindex @code{3byte} directive, ARC
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@item .3byte @var{expressions}
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*TODO*
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@cindex @code{4byte} directive, ARC
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@item .4byte @var{expressions}
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*TODO*
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@cindex @code{extAuxRegister} directive, ARC
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@item .extAuxRegister @var{name},@var{address},@var{mode}
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*TODO*
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@smallexample
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.extAuxRegister mulhi,0x12,w
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@end smallexample
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@cindex @code{extCondCode} directive, ARC
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@item .extCondCode @var{suffix},@var{value}
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*TODO*
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@smallexample
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.extCondCode is_busy,0x14
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@end smallexample
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@cindex @code{extCoreRegister} directive, ARC
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@item .extCoreRegister @var{name},@var{regnum},@var{mode},@var{shortcut}
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*TODO*
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@smallexample
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.extCoreRegister mlo,57,r,can_shortcut
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@end smallexample
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@cindex @code{extInstruction} directive, ARC
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@item .extInstruction @var{name},@var{opcode},@var{subopcode},@var{suffixclass},@var{syntaxclass}
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*TODO*
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@smallexample
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.extInstruction mul64,0x14,0x0,SUFFIX_COND,SYNTAX_3OP|OP1_MUST_BE_IMM
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@end smallexample
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@cindex @code{half} directive, ARC
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@item .half @var{expressions}
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*TODO*
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@cindex @code{long} directive, ARC
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@item .long @var{expressions}
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*TODO*
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@cindex @code{option} directive, ARC
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@item .option @var{arc|arc5|arc6|arc7|arc8}
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The @code{.option} directive must be followed by the desired core
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version. Again @code{arc} is an alias for
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@code{arc@value{ARC_CORE_DEFAULT}}.
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Note: the @code{.option} directive overrides the command line option
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@code{-marc}; a warning is emitted when the version is not consistent
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between the two - even for the implicit default core version
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(arc@value{ARC_CORE_DEFAULT}).
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@cindex @code{short} directive, ARC
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@item .short @var{expressions}
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*TODO*
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@cindex @code{word} directive, ARC
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@item .word @var{expressions}
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*TODO*
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@end table
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@node ARC Opcodes
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@section Opcodes
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@cindex ARC opcodes
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@cindex opcodes for ARC
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For information on the ARC instruction set, see @cite{ARC Programmers
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Reference Manual}, ARC Cores Ltd.
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