183 lines
5.4 KiB
Plaintext
183 lines
5.4 KiB
Plaintext
@c Copyright 1991, 1992, 1993, 1994, 1995 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 AMD29K-Dependent
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@chapter AMD 29K 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 AMD 29K Dependent Features
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@end ifclear
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@cindex AMD 29K support
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@cindex 29K support
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@menu
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* AMD29K Options:: Options
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* AMD29K Syntax:: Syntax
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* AMD29K Floating Point:: Floating Point
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* AMD29K Directives:: AMD 29K Machine Directives
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* AMD29K Opcodes:: Opcodes
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@end menu
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@node AMD29K Options
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@section Options
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@cindex AMD 29K options (none)
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@cindex options for AMD29K (none)
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@code{@value{AS}} has no additional command-line options for the AMD
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29K family.
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@node AMD29K Syntax
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@section Syntax
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@menu
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* AMD29K-Macros:: Macros
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* AMD29K-Chars:: Special Characters
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* AMD29K-Regs:: Register Names
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@end menu
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@node AMD29K-Macros
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@subsection Macros
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@cindex Macros, AMD 29K
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@cindex AMD 29K macros
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The macro syntax used on the AMD 29K is like that described in the AMD
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29K Family Macro Assembler Specification. Normal @code{@value{AS}}
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macros should still work.
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@node AMD29K-Chars
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@subsection Special Characters
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@cindex line comment character, AMD 29K
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@cindex AMD 29K line comment character
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@samp{;} is the line comment character.
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@cindex identifiers, AMD 29K
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@cindex AMD 29K identifiers
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The character @samp{?} is permitted in identifiers (but may not begin
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an identifier).
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@node AMD29K-Regs
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@subsection Register Names
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@cindex AMD 29K register names
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@cindex register names, AMD 29K
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General-purpose registers are represented by predefined symbols of the
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form @samp{GR@var{nnn}} (for global registers) or @samp{LR@var{nnn}}
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(for local registers), where @var{nnn} represents a number between
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@code{0} and @code{127}, written with no leading zeros. The leading
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letters may be in either upper or lower case; for example, @samp{gr13}
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and @samp{LR7} are both valid register names.
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You may also refer to general-purpose registers by specifying the
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register number as the result of an expression (prefixed with @samp{%%}
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to flag the expression as a register number):
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@smallexample
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%%@var{expression}
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@end smallexample
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@noindent
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---where @var{expression} must be an absolute expression evaluating to a
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number between @code{0} and @code{255}. The range [0, 127] refers to
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global registers, and the range [128, 255] to local registers.
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@cindex special purpose registers, AMD 29K
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@cindex AMD 29K special purpose registers
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@cindex protected registers, AMD 29K
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@cindex AMD 29K protected registers
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In addition, @code{@value{AS}} understands the following protected
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special-purpose register names for the AMD 29K family:
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@smallexample
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vab chd pc0
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ops chc pc1
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cps rbp pc2
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cfg tmc mmu
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cha tmr lru
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@end smallexample
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These unprotected special-purpose register names are also recognized:
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@smallexample
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ipc alu fpe
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ipa bp inte
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ipb fc fps
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q cr exop
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@end smallexample
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@node AMD29K Floating Point
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@section Floating Point
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@cindex floating point, AMD 29K (@sc{ieee})
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@cindex AMD 29K floating point (@sc{ieee})
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The AMD 29K family uses @sc{ieee} floating-point numbers.
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@node AMD29K Directives
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@section AMD 29K Machine Directives
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@cindex machine directives, AMD 29K
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@cindex AMD 29K machine directives
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@table @code
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@cindex @code{block} directive, AMD 29K
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@item .block @var{size} , @var{fill}
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This directive emits @var{size} bytes, each of value @var{fill}. Both
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@var{size} and @var{fill} are absolute expressions. If the comma
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and @var{fill} are omitted, @var{fill} is assumed to be zero.
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In other versions of the @sc{gnu} assembler, this directive is called
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@samp{.space}.
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@end table
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@table @code
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@cindex @code{cputype} directive, AMD 29K
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@item .cputype
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This directive is ignored; it is accepted for compatibility with other
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AMD 29K assemblers.
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@cindex @code{file} directive, AMD 29K
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@item .file
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This directive is ignored; it is accepted for compatibility with other
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AMD 29K assemblers.
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@quotation
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@emph{Warning:} in other versions of the @sc{gnu} assembler, @code{.file} is
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used for the directive called @code{.app-file} in the AMD 29K support.
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@end quotation
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@cindex @code{line} directive, AMD 29K
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@item .line
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This directive is ignored; it is accepted for compatibility with other
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AMD 29K assemblers.
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@ignore
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@c since we're ignoring .lsym...
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@cindex @code{reg} directive, AMD 29K
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@item .reg @var{symbol}, @var{expression}
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@code{.reg} has the same effect as @code{.lsym}; @pxref{Lsym,,@code{.lsym}}.
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@end ignore
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@cindex @code{sect} directive, AMD 29K
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@item .sect
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This directive is ignored; it is accepted for compatibility with other
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AMD 29K assemblers.
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@cindex @code{use} directive, AMD 29K
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@item .use @var{section name}
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Establishes the section and subsection for the following code;
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@var{section name} may be one of @code{.text}, @code{.data},
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@code{.data1}, or @code{.lit}. With one of the first three @var{section
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name} options, @samp{.use} is equivalent to the machine directive
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@var{section name}; the remaining case, @samp{.use .lit}, is the same as
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@samp{.data 200}.
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@end table
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@node AMD29K Opcodes
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@section Opcodes
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@cindex AMD 29K opcodes
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@cindex opcodes for AMD 29K
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@code{@value{AS}} implements all the standard AMD 29K opcodes. No
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additional pseudo-instructions are needed on this family.
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For information on the 29K machine instruction set, see @cite{Am29000
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User's Manual}, Advanced Micro Devices, Inc.
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