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Updates for Hitachi H8/300H
This commit is contained in:
Roland Pesch
parent
89a2c4fdaa
commit
8d8ddccbe0
@ -21,11 +21,9 @@
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@ifset H8/500
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@set H8
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@end ifset
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@c start-sanitize-Hitachi-SH
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@ifset SH
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@set H8
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@end ifset
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@c end-sanitize-Hitachi-SH
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@c ------------
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@ifset GENERIC
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@settitle Using @value{AS}
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@ -39,7 +37,7 @@
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@ifinfo
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@format
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START-INFO-DIR-ENTRY
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* As: (as). The GNU assembler.
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* As:: The GNU assembler.
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END-INFO-DIR-ENTRY
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@end format
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@end ifinfo
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@ -320,9 +318,10 @@ the MIPS R2000/R3000 processors.
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@table @code
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@item -G @var{num}
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This option sets the largest size of an object that can be referenced
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This option sets the largest size of an object that will be referenced
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implicitly with the @code{gp} register. It is only accepted for targets
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that use ECOFF format, such as a DECstation running Ultrix.
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that use ECOFF format, such as a DECstation running Ultrix. The default
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value is 8.
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@item -nocpp
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@itemx -EB, -EL
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@ -380,18 +379,17 @@ machine architecture manual for this information.
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@ifclear GENERIC
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@ifset H8/300
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For information on the H8/300 machine instruction set, see @cite{H8/300
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Series Programming Manual} (Hitachi ADE--602--025).
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Series Programming Manual} (Hitachi ADE--602--025). For the H8/300H,
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see @cite{H8/300H Series Programming Manual} (Hitachi).
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@end ifset
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@ifset H8/500
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For information on the H8/500 machine instruction set, see @cite{H8/500
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Series Programming Manual} (Hitachi M21T001).
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@end ifset
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@c start-sanitize-Hitachi-SH
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@ifset SH
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For information on the Hitachi SH machine instruction set, see
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@cite{SH-Microcomputer User's Manual} (Hitachi Micro Systems, Inc.).
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@end ifset
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@c end-sanitize-Hitachi-SH
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@ifset Z8000
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For information on the Z8000 machine instruction set, see @cite{Z8000 CPU Technical Manual}
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@end ifset
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@ -1014,11 +1012,9 @@ is considered a comment and is ignored. The line comment character is
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@ifset H8/500
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@samp{!} for the H8/500 family;
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@end ifset
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@c start-sanitize-Hitachi-SH
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@ifset SH
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@samp{!} for the Hitachi SH;
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@end ifset
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@c end-sanitize-Hitachi-SH
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@ifset Z8000
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@samp{!} for the Z8000;
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@end ifset
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@ -1104,9 +1100,7 @@ are an exception: they don't end statements.
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@ifset H8
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A @dfn{statement} ends at a newline character (@samp{\n}); or (for the
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H8/300) a dollar sign (@samp{$}); or (for the
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@c start-sanitize-Hitachi-SH
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Hitachi-SH or the
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@c end-sanitize-Hitachi-SH
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H8/500) a semicolon
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(@samp{;}). The newline or separator character is considered part of
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the preceding statement. Newlines and separators within character
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@ -1329,9 +1323,7 @@ grave accent. A newline
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@end ifset
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@ifset H8
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(or dollar sign @samp{$}, for the H8/300; or semicolon @samp{;} for the
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@c start-sanitize-Hitachi-SH
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Hitachi SH or
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@c end-sanitize-Hitachi-SH
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H8/500)
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@end ifset
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@end ifset
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@ -1434,9 +1426,7 @@ to allow any of @samp{defghDEFGH}.)
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@end ignore
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On the H8/300, H8/500,
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@c start-sanitize-Hitachi-SH
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Hitachi SH,
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@c end-sanitize-Hitachi-SH
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and AMD 29K architectures, the letter must be
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one of the letters @samp{DFPRSX} (in upper or lower case).
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@ -1562,9 +1552,7 @@ the task of adjusting mentions of object-file addresses so they refer to
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the proper run-time addresses.
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@ifset H8
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For the H8/300 and H8/500,
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@c start-sanitize-Hitachi-SH
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and for the Hitachi SH,
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@c end-sanitize-Hitachi-SH
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@code{@value{AS}} pads sections if needed to
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ensure they end on a word (sixteen bit) boundary.
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@end ifset
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@ -1874,9 +1862,7 @@ of @code{@value{AS}}.)
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@ifset H8
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On the H8/300 and H8/500 platforms, each subsection is zero-padded to a word
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boundary (two bytes).
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@c start-sanitize-Hitachi-SH
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The same is true on the Hitachi SH.
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@c end-sanitize-Hitachi-SH
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@end ifset
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@ifset I960
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@c FIXME section padding (alignment)?
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@ -2018,9 +2004,7 @@ body of a symbol name, though not at its beginning.
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@ifset SPECIAL-SYMS
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@ifset H8
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Symbol names begin with a letter or with one of @samp{._}. On the
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@c start-sanitize-Hitachi-SH
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Hitachi SH or the
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@c end-sanitize-Hitachi-SH
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H8/500, you can also use @code{$} in symbol names. That character may
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be followed by any string of digits, letters, dollar signs (save on the
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H8/300), and underscores.
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@ -3007,10 +2991,9 @@ the program.
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@ifclear GENERIC
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@ifset H8
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On the H8/300 and H8/500, @code{.int} emits 16-bit integers.
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@c start-sanitize-Hitachi-SH
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On the Hitachi SH, however, @code{.int} emits 32-bit integers.
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@c end-sanitize-Hitachi-SH
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On the H8/500 and most forms of the H8/300, @code{.int} emits 16-bit
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integers. On the H8/300H and the Hitachi SH, however, @code{.int} emits
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32-bit integers.
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@end ifset
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@end ifclear
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@ -3636,11 +3619,9 @@ subject, see the hardware manufacturer's manual.
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@ifset H8/500
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* H8/500-Dependent:: Hitachi H8/500 Dependent Features
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@end ifset
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@c start-sanitize-Hitachi-SH
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@ifset SH
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* SH-Dependent:: Hitachi SH Dependent Features
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@end ifset
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@c end-sanitize-Hitachi-SH
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@ifset I960
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* i960-Dependent:: Intel 80960 Dependent Features
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@end ifset
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@ -4182,10 +4163,7 @@ family.
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@menu
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* H8/300-Dependent:: Hitachi H8/300 Dependent Features
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* H8/500-Dependent:: Hitachi H8/500 Dependent Features
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@c start-sanitize-Hitachi-SH
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* SH-Dependent:: Hitachi SH Dependent Features
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@c end-sanitize-Hitachi-SH
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@end menu
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@down
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@end ifclear
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@ -4240,7 +4218,7 @@ Therefore @emph{you may not use @samp{$} in symbol names} on the H8/300.
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@subsection Register Names
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@cindex H8/300 registers
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@cindex registers, H8/300
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@cindex register names, H8/300
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You can use predefined symbols of the form @samp{r@var{n}h} and
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@samp{r@var{n}l} to refer to the H8/300 registers as sixteen 8-bit
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general-purpose registers. @var{n} is a digit from @samp{0} to
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@ -4251,10 +4229,14 @@ You can also use the eight predefined symbols @samp{r@var{n}} to refer
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to the H8/300 registers as 16-bit registers (you must use this form for
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addressing).
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On the H8/300H, you can also use the eight predefined symbols
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@samp{er@var{n}} (@samp{er0} @dots{} @samp{er7}) to refer to the 32-bit
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general purpose registers.
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The two control registers are called @code{pc} (program counter; a
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16-bit register) and @code{ccr} (condition code register; an 8-bit
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register). @code{r7} is used as the stack pointer, and can also be
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called @code{sp}.
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16-bit register, except on the H8/300H where it is 24 bits) and
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@code{ccr} (condition code register; an 8-bit register). @code{r7} is
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used as the stack pointer, and can also be called @code{sp}.
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@node H8/300-Addressing
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@subsection Addressing Modes
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@ -4271,9 +4253,9 @@ Register indirect
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@item @@(@var{d}, r@var{n})
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@itemx @@(@var{d}:16, r@var{n})
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Register indirect: 16-bit displacement @var{d} from register @var{n}.
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(You may specify the @samp{:16} for clarity if you wish, but it is not
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required and has no effect.)
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@itemx @@(@var{d}:24, r@var{n})
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Register indirect: 16-bit or 24-bit displacement @var{d} from register
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@var{n}. (24-bit displacements are only meaningful on the H8/300H.)
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@item @@r@var{n}+
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Register indirect with post-increment
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@ -4284,16 +4266,18 @@ Register indirect with pre-decrement
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@item @code{@@}@var{aa}
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@itemx @code{@@}@var{aa}:8
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@itemx @code{@@}@var{aa}:16
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Absolute address @code{aa}. You may specify the @samp{:8} or @samp{:16}
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for clarity, if you wish; but @code{@value{AS}} neither requires this nor
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uses it---the address size required is taken from context.
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@itemx @code{@@}@var{aa}:24
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Absolute address @code{aa}. (The address size @samp{:24} only makes
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sense on the H8/300H.)
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@item #@var{xx}
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@itemx #@var{xx}:8
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@itemx #@var{xx}:16
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Immediate data @var{xx}. You may specify the @samp{:8} or @samp{:16}
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for clarity, if you wish; but @code{@value{AS}} neither requires this nor
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uses it---the data size required is taken from context.
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@itemx #@var{xx}:32
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Immediate data @var{xx}. You may specify the @samp{:8}, @samp{:16}, or
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@samp{:32} for clarity, if you wish; but @code{@value{AS}} neither
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requires this nor uses it---the data size required is taken from
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context.
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@item @code{@@}@code{@@}@var{aa}
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@itemx @code{@@}@code{@@}@var{aa}:8
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@ -4306,8 +4290,11 @@ wish; but @code{@value{AS}} neither requires this nor uses it.
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@cindex floating point, H8/300 (@sc{ieee})
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@cindex H8/300 floating point (@sc{ieee})
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The H8/300 family uses @sc{ieee} floating-point numbers.
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The H8/300 family has no hardware floating point, but the @code{.float}
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directive generates @sc{ieee} floating-point numbers for compatibility
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with other development tools.
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@page
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@node H8/300 Directives
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@section H8/300 Machine Directives
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@ -4315,8 +4302,18 @@ The H8/300 family uses @sc{ieee} floating-point numbers.
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@cindex machine directives, H8/300 (none)
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@cindex @code{word} directive, H8/300
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@cindex @code{int} directive, H8/300
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@code{@value{AS}} has no machine-dependent directives for the H8/300.
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However, on this platform the @samp{.int} and @samp{.word} directives
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@code{@value{AS}} has only one machine-dependent directive for the
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H8/300:
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@table @code
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@item .h300h
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@cindex H8/300H, assembling for
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Recognize and emit additional instructions for the H8/300H variant, and
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also make @code{.int} emit 32-bit numbers rather than the usual (16-bit)
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for the H8/300 family.
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@end table
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On the H8/300 family (including the H8/300H) @samp{.word} directives
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generate 16-bit numbers.
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@node H8/300 Opcodes
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@ -4327,115 +4324,175 @@ generate 16-bit numbers.
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@cindex mnemonics, H8/300
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@cindex instruction summary, H8/300
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For detailed information on the H8/300 machine instruction set, see
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@cite{H8/300 Series Programming Manual} (Hitachi ADE--602--025).
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@cite{H8/300 Series Programming Manual} (Hitachi ADE--602--025). For
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information specific to the H8/300H, see @cite{H8/300H Series
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Programming Manual} (Hitachi).
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@code{@value{AS}} implements all the standard H8/300 opcodes. No additional
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pseudo-instructions are needed on this family.
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The following table summarizes the opcodes and their arguments:
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@c kluge due to lack of group outside example
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@page
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The following table summarizes the H8/300 opcodes, and their arguments.
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Entries marked @samp{*} are opcodes used only on the H8/300H.
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@smallexample
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@c In texinfo 2.102, @group makes this doublepsace!!
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@c @group
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@c Using @group seems to use the normal baselineskip, not the smallexample
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@c baselineskip; looks approx doublespaced.
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@i{Legend:}
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Rs @r{source register}
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Rd @r{destination register}
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abs @r{absolute address}
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imm @r{immediate data}
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x:3 @r{a bit (as a number between 0 and 7)}
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d:8 @r{eight bit displacement from @code{pc}}
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d:16 @r{sixteen bit displacement from @code{Rs}}
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disp:N @r{N-bit displacement from a register}
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pcrel:N @r{N-bit displacement relative to program counter}
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add.b Rs,Rd biand #x:3,Rd
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add.b #imm:8,Rd biand #x:3,@@Rd
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add.w Rs,Rd biand #x:3,@@aa:8
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adds #1,Rd bild #x:3,Rd
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adds #2,Rd bild #x:3,@@Rd
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addx #imm:8,Rd bild #x:3,@@aa:8
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addx Rs,Rd bior #x:3,Rd
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and #imm:8,Rd bior #x:3,@@Rd
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and Rs,Rd bior #x:3,@@aa:8
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andc #imm:8,ccr bist #x:3,Rd
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band #x:3,Rd bist #x:3,@@Rd
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band #x:3,@@Rd bist #x:3,@@aa:8
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bra d:8 bixor #x:3,Rd
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bt d:8 bixor #x:3,@@Rd
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brn d:8 bixor #x:3,@@aa:8
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bf d:8 bld #x:3,Rd
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bhi d:8 bld #x:3,@@Rd
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bls d:8 bld #x:3,@@aa:8
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bcc d:8 bnot #x:3,Rd
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bhs d:8 bnot #x:3,@@Rd
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bcs d:8 bnot #x:3,@@aa:8
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blo d:8 bnot Rs,Rd
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bne d:8 bnot Rs,@@Rd
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beq d:8 bnot Rs,@@aa:8
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bvc d:8 bor #x:3,Rd
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bvs d:8 bor #x:3,@@Rd
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bpl d:8 bor #x:3,@@aa:8
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bmi d:8 bset #x:3,@@Rd
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bge d:8 bset #x:3,@@aa:8
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blt d:8 bset Rs,Rd
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bgt d:8 bset Rs,@@Rd
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ble d:8 bset Rs,@@aa:8
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bclr #x:3,Rd bsr d:8
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bclr #x:3,@@Rd bst #x:3,Rd
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bclr #x:3,@@aa:8 bst #x:3,@@Rd
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bclr Rs,Rd bst #x:3,@@aa:8
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bclr Rs,@@Rd btst #x:3,Rd
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@c @end group
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add.b #imm,rd * andc #imm,ccr
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add.b rs,rd band #imm,rd
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add.w rs,rd band #imm,@@rd
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* add.w #imm,rd band #imm,@@abs:8
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* add.l rs,rd bra pcrel:8
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* add.l #imm,rd * bra pcrel:16
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adds #imm,rd bt pcrel:8
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addx #imm,rd * bt pcrel:16
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addx rs,rd brn pcrel:8
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and.b #imm,rd * brn pcrel:16
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and.b rs,rd bf pcrel:8
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* and.w rs,rd * bf pcrel:16
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* and.w #imm,rd bhi pcrel:8
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* and.l #imm,rd * bhi pcrel:16
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* and.l rs,rd bls pcrel:8
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@page
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@c @group
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btst #x:3,@@Rd mov.w @@(d:16, Rs),Rd
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btst #x:3,@@aa:8 mov.w @@Rs+,Rd
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btst Rs,Rd mov.w @@aa:16,Rd
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btst Rs,@@Rd mov.w Rs,@@Rd
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btst Rs,@@aa:8 mov.w Rs,@@(d:16, Rd)
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bxor #x:3,Rd mov.w Rs,@@-Rd
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bxor #x:3,@@Rd mov.w Rs,@@aa:16
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bxor #x:3,@@aa:8 movfpe @@aa:16,Rd
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cmp.b #imm:8,Rd movtpe Rs,@@aa:16
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cmp.b Rs,Rd mulxu Rs,Rd
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cmp.w Rs,Rd neg Rs
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daa Rs nop
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das Rs not Rs
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dec Rs or #imm:8,Rd
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divxu Rs,Rd or Rs,Rd
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eepmov orc #imm:8,ccr
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inc Rs pop Rs
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jmp @@Rs push Rs
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jmp @@aa:16 rotl Rs
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jmp @@@@aa rotr Rs
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jsr @@Rs rotxl Rs
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jsr @@aa:16 rotxr Rs
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jsr @@@@aa:8 rte
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ldc #imm:8,ccr rts
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ldc Rs,ccr shal Rs
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mov.b Rs,Rd shar Rs
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mov.b #imm:8,Rd shll Rs
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mov.b @@Rs,Rd shlr Rs
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mov.b @@(d:16, Rs),Rd sleep
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mov.b @@Rs+,Rd stc ccr,Rd
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mov.b @@aa:16,Rd sub.b Rs,Rd
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mov.b @@aa:8,Rd sub.w Rs,Rd
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mov.b Rs,@@Rd subs #1,Rd
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mov.b Rs,@@(d:16, Rd) subs #2,Rd
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mov.b Rs,@@-Rd subx #imm:8,Rd
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mov.b Rs,@@aa:16 subx Rs,Rd
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mov.b Rs,@@aa:8 xor #imm:8,Rd
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mov.w Rs,Rd xor Rs,Rd
|
||||
mov.w #imm:16,Rd xorc #imm:8,ccr
|
||||
mov.w @@Rs,Rd
|
||||
@c @end group
|
||||
* bls pcrel:16 bld #imm,rd
|
||||
bcc pcrel:8 bld #imm,@@rd
|
||||
* bcc pcrel:16 bld #imm,@@abs:8
|
||||
bhs pcrel:8 bnot #imm,rd
|
||||
* bhs pcrel:16 bnot #imm,@@rd
|
||||
bcs pcrel:8 bnot #imm,@@abs:8
|
||||
* bcs pcrel:16 bnot rs,rd
|
||||
blo pcrel:8 bnot rs,@@rd
|
||||
* blo pcrel:16 bnot rs,@@abs:8
|
||||
bne pcrel:8 bor #imm,rd
|
||||
* bne pcrel:16 bor #imm,@@rd
|
||||
beq pcrel:8 bor #imm,@@abs:8
|
||||
* beq pcrel:16 bset #imm,rd
|
||||
bvc pcrel:8 bset #imm,@@rd
|
||||
* bvc pcrel:16 bset #imm,@@abs:8
|
||||
bvs pcrel:8 bset rs,rd
|
||||
* bvs pcrel:16 bset rs,@@rd
|
||||
bpl pcrel:8 bset rs,@@abs:8
|
||||
* bpl pcrel:16 bsr pcrel:8
|
||||
bmi pcrel:8 bsr pcrel:16
|
||||
* bmi pcrel:16 bst #imm,rd
|
||||
bge pcrel:8 bst #imm,@@rd
|
||||
* bge pcrel:16 bst #imm,@@abs:8
|
||||
blt pcrel:8 btst #imm,rd
|
||||
* blt pcrel:16 btst #imm,@@rd
|
||||
bgt pcrel:8 btst #imm,@@abs:8
|
||||
* bgt pcrel:16 btst rs,rd
|
||||
ble pcrel:8 btst rs,@@rd
|
||||
* ble pcrel:16 btst rs,@@abs:8
|
||||
bclr #imm,rd bxor #imm,rd
|
||||
bclr #imm,@@rd bxor #imm,@@rd
|
||||
bclr #imm,@@abs:8 bxor #imm,@@abs:8
|
||||
bclr rs,rd cmp.b #imm,rd
|
||||
bclr rs,@@rd cmp.b rs,rd
|
||||
bclr rs,@@abs:8 cmp.w rs,rd
|
||||
biand #imm,rd cmp.w rs,rd
|
||||
biand #imm,@@rd * cmp.w #imm,rd
|
||||
biand #imm,@@abs:8 * cmp.l #imm,rd
|
||||
bild #imm,rd * cmp.l rs,rd
|
||||
bild #imm,@@rd daa rs
|
||||
bild #imm,@@abs:8 das rs
|
||||
bior #imm,rd dec.b rs
|
||||
bior #imm,@@rd * dec.w #imm,rd
|
||||
bior #imm,@@abs:8 * dec.l #imm,rd
|
||||
bist #imm,rd divxu.b rs,rd
|
||||
bist #imm,@@rd * divxu.w rs,rd
|
||||
bist #imm,@@abs:8 * divxs.b rs,rd
|
||||
bixor #imm,rd * divxs.w rs,rd
|
||||
bixor #imm,@@rd eepmov
|
||||
bixor #imm,@@abs:8 * eepmovw
|
||||
@page
|
||||
* exts.w rd mov.w rs,@@abs:16
|
||||
* exts.l rd * mov.l #imm,rd
|
||||
* extu.w rd * mov.l rs,rd
|
||||
* extu.l rd * mov.l @@rs,rd
|
||||
inc rs * mov.l @@(disp:16,rs),rd
|
||||
* inc.w #imm,rd * mov.l @@(disp:24,rs),rd
|
||||
* inc.l #imm,rd * mov.l @@rs+,rd
|
||||
jmp @@rs * mov.l @@abs:16,rd
|
||||
jmp abs * mov.l @@abs:24,rd
|
||||
jmp @@@@abs:8 * mov.l rs,@@rd
|
||||
jsr @@rs * mov.l rs,@@(disp:16,rd)
|
||||
jsr abs * mov.l rs,@@(disp:24,rd)
|
||||
jsr @@@@abs:8 * mov.l rs,@@-rd
|
||||
ldc #imm,ccr * mov.l rs,@@abs:16
|
||||
ldc rs,ccr * mov.l rs,@@abs:24
|
||||
* ldc @@abs:16,ccr movfpe @@abs:16,rd
|
||||
* ldc @@abs:24,ccr movtpe rs,@@abs:16
|
||||
* ldc @@(disp:16,rs),ccr mulxu.b rs,rd
|
||||
* ldc @@(disp:24,rs),ccr * mulxu.w rs,rd
|
||||
* ldc @@rs+,ccr * mulxs.b rs,rd
|
||||
* ldc @@rs,ccr * mulxs.w rs,rd
|
||||
* mov.b @@(disp:24,rs),rd neg.b rs
|
||||
* mov.b rs,@@(disp:24,rd) * neg.w rs
|
||||
mov.b @@abs:16,rd * neg.l rs
|
||||
mov.b rs,rd nop
|
||||
mov.b @@abs:8,rd not.b rs
|
||||
mov.b rs,@@abs:8 * not.w rs
|
||||
mov.b rs,rd * not.l rs
|
||||
mov.b #imm,rd or.b #imm,rd
|
||||
mov.b @@rs,rd or.b rs,rd
|
||||
mov.b @@(disp:16,rs),rd * or.w #imm,rd
|
||||
mov.b @@rs+,rd * or.w rs,rd
|
||||
mov.b @@abs:8,rd * or.l #imm,rd
|
||||
mov.b rs,@@rd * or.l rs,rd
|
||||
mov.b rs,@@(disp:16,rd) orc #imm,ccr
|
||||
mov.b rs,@@-rd pop.w rs
|
||||
mov.b rs,@@abs:8 * pop.l rs
|
||||
mov.w rs,@@rd push.w rs
|
||||
* mov.w @@(disp:24,rs),rd * push.l rs
|
||||
* mov.w rs,@@(disp:24,rd) rotl.b rs
|
||||
* mov.w @@abs:24,rd * rotl.w rs
|
||||
* mov.w rs,@@abs:24 * rotl.l rs
|
||||
mov.w rs,rd rotr.b rs
|
||||
mov.w #imm,rd * rotr.w rs
|
||||
mov.w @@rs,rd * rotr.l rs
|
||||
mov.w @@(disp:16,rs),rd rotxl.b rs
|
||||
mov.w @@rs+,rd * rotxl.w rs
|
||||
mov.w @@abs:16,rd * rotxl.l rs
|
||||
mov.w rs,@@(disp:16,rd) rotxr.b rs
|
||||
mov.w rs,@@-rd * rotxr.w rs
|
||||
@page
|
||||
* rotxr.l rs * stc ccr,@@(disp:24,rd)
|
||||
bpt * stc ccr,@@-rd
|
||||
rte * stc ccr,@@abs:16
|
||||
rts * stc ccr,@@abs:24
|
||||
shal.b rs sub.b rs,rd
|
||||
* shal.w rs sub.w rs,rd
|
||||
* shal.l rs * sub.w #imm,rd
|
||||
shar.b rs * sub.l rs,rd
|
||||
* shar.w rs * sub.l #imm,rd
|
||||
* shar.l rs subs #imm,rd
|
||||
shll.b rs subx #imm,rd
|
||||
* shll.w rs subx rs,rd
|
||||
* shll.l rs * trapa #imm
|
||||
shlr.b rs xor #imm,rd
|
||||
* shlr.w rs xor rs,rd
|
||||
* shlr.l rs * xor.w #imm,rd
|
||||
sleep * xor.w rs,rd
|
||||
stc ccr,rd * xor.l #imm,rd
|
||||
* stc ccr,@@rs * xor.l rs,rd
|
||||
* stc ccr,@@(disp:16,rd) xorc #imm,ccr
|
||||
@end smallexample
|
||||
|
||||
@cindex size suffixes, H8/300
|
||||
@cindex H8/300 size suffixes
|
||||
Four H8/300 instructions (@code{add}, @code{cmp}, @code{mov},
|
||||
@code{sub}) are defined with variants using the suffixes @samp{.b} and
|
||||
@samp{.w} to specify the size of a memory operand. @code{@value{AS}}
|
||||
supports these suffixes, but does not require them; since one of the
|
||||
operands is always a register, @code{@value{AS}} can deduce the correct size.
|
||||
@code{sub}) are defined with variants using the suffixes @samp{.b},
|
||||
@samp{.w}, and @samp{.l} to specify the size of a memory operand.
|
||||
@code{@value{AS}} supports these suffixes, but does not require them;
|
||||
since one of the operands is always a register, @code{@value{AS}} can
|
||||
deduce the correct size.
|
||||
|
||||
For example, since @code{r0} refers to a 16-bit register,
|
||||
@example
|
||||
@ -4444,8 +4501,8 @@ mov r0,@@foo
|
||||
mov.w r0,@@foo
|
||||
@end example
|
||||
|
||||
If you use the size suffixes, @code{@value{AS}} will issue a warning if
|
||||
there's a mismatch between the suffix and the register size.
|
||||
If you use the size suffixes, @code{@value{AS}} issues a warning when
|
||||
the suffix and the register size do not match.
|
||||
@end ifset
|
||||
|
||||
@ifset H8/500
|
||||
@ -4713,7 +4770,6 @@ mov[:g] sz ea,rd
|
||||
@end smallexample
|
||||
|
||||
@end ifset
|
||||
@c start-sanitize-Hitachi-SH
|
||||
@ifset SH
|
||||
@page
|
||||
@node SH-Dependent
|
||||
@ -4971,7 +5027,6 @@ stc SR,Rn
|
||||
@end ifset
|
||||
|
||||
@end ifset
|
||||
@c end-sanitize-Hitachi-SH
|
||||
@ifset I960
|
||||
@ifset GENERIC
|
||||
@page
|
||||
@ -6543,7 +6598,49 @@ The MIPS @value{AS} supports the MIPS R2000 and R3000 processors.
|
||||
|
||||
It ignores the @kbd{-nocpp}, @kbd{-EL}, and @kbd{-EB} options.
|
||||
|
||||
@i{FIXME: What other information do we need to note here?}
|
||||
Not all traditional MIPS macro instructions are currently supported.
|
||||
Specifically, @code{li.d} and @code{li.s} are not currently supported.
|
||||
|
||||
When using @code{@value{GCC}} with MIPS @value{AS}, @code{@value{GCC}}
|
||||
must be configured using the -with-gnu-as switch (this is the case for
|
||||
Cygnus distributions) or @code{@value{GCC}} must be invoked with the
|
||||
-mgas option.
|
||||
|
||||
Assembling for a MIPS ECOFF target supports some additional sections
|
||||
besides the usual @code{.text}, @code{.data} and @code{.bss}. The
|
||||
additional sections are @code{.rdata}, used for readonly data,
|
||||
@code{.sdata}, used for small data, and @code{.sbss}, used for small
|
||||
common objects.
|
||||
|
||||
When assembling for ECOFF, the assembler will automatically use the $gp
|
||||
($28) register when forming the address of a small object. Any object
|
||||
in the .sdata or .sbss sections is considered to be small. For external
|
||||
objects or objects in the @code{.bss} section, the -G switch may be used
|
||||
to control the size of objects for which the $gp register will be used;
|
||||
the default value is 8, meaning that a reference to any object eight
|
||||
bytes or smaller will use $gp. Passing -G 0 to @value{AS} will prevent
|
||||
it from using the $gp register. The size of an object in the
|
||||
@code{.bss} section is set by the @code{.comm} or @code{.lcomm}
|
||||
pseudo-op that defines it. The size of an external object may be set
|
||||
using the @code{.extern} pseudo-op. For example, @samp{.extern sym,4}
|
||||
declares that the object at @code{sym} is 4 bytes in length, whie
|
||||
leaving @code{sym} otherwise undefined.
|
||||
|
||||
Using small ECOFF objects requires linker support, and assumes that the
|
||||
$gp register has been correctly initialized (normally done automatically
|
||||
by the startup code). MIPS ECOFF assembly code must avoid modifying the
|
||||
$gp register.
|
||||
|
||||
MIPS ECOFF @value{AS} supports several pseudo-ops used for generating
|
||||
debugging information which are not support by traditional MIPS
|
||||
assemblers. These are @code{.def}, @code{.endef}, @code{.dim},
|
||||
@code{.file}, @code{.scl}, @code{.size}, @code{.tag}, @code{.type},
|
||||
@code{.val}, @code{.stabd}, @code{.stabn}, and @code{.stabs}. The
|
||||
debugging information generated by the three @code{.stab} pseudo-ops can
|
||||
only be read by GDB, not by traditional MIPS debuggers (this enhancement
|
||||
is required to fully support C++ debugging). These psuedo-ops are
|
||||
primarily used by compilers, not assembly language programmers, and are
|
||||
described elsewhere in the manual.
|
||||
|
||||
@end ifset
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user