Add support for the xdef and xref pseudo-ops to the Z80 assembler.
PR 25690 * config/tc-z80.c (md_pseudo_table): Add xdef anf xref pseudo ops. * doc/c-z80.texi: Update documentation.
This commit is contained in:
Sergey Belyashov
Nick Clifton
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@ -1,3 +1,9 @@
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2020-03-17 Sergey Belyashov <sergey.belyashov@gmail.com>
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PR 25690
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* config/tc-z80.c (md_pseudo_table): Add xdef anf xref pseudo ops.
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* doc/c-z80.texi: Update documentation.
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2020-03-17 Sergey Belyashov <sergey.belyashov@gmail.com>
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PR 25641
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@ -3460,6 +3460,8 @@ const pseudo_typeS md_pseudo_table[] =
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{ "dw", z80_cons, 2},
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{ "psect", psect, 0}, /* TODO: Translate attributes. */
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{ "set", 0, 0}, /* Real instruction on z80. */
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{ "xdef", s_globl, 0}, /* Synonym for .GLOBAL */
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{ "xref", s_ignore, 0}, /* Synonym for .EXTERN */
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{ NULL, 0, 0 }
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} ;
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@ -30,7 +30,7 @@
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@c man begin OPTIONS
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@table @gcctabopt
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@cindex @samp{-march=} option, Z80
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@cindex @code{-march=} command-line option, Z80
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@item -march=@var{CPU}[-@var{EXT}@dots{}][+@var{EXT}@dots{}]
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This option specifies the target processor. The assembler will issue
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an error message if an attempt is made to assemble an instruction which
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@ -45,9 +45,9 @@ are recognized:
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In addition to the basic instruction set, the assembler can be told to
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accept some extention mnemonics. For example,
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@code{-march=z180+sli+infc} extends @var{z180} with @var{SLI} instructions and
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@var{IN F,(C)}. The following instructions are currently supported:
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@var{IN F,(C)}. The following extentions are currently supported:
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@code{full} (all known instructions),
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@code{adl} (ADL CPU mode by default),
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@code{adl} (ADL CPU mode by default, eZ80 only),
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@code{sli} (instruction known as @var{SLI}, @var{SLL} or @var{SL1}),
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@code{xyhl} (instructions with halves of index registers: @var{IXL}, @var{IXH},
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@var{IYL}, @var{IYH}),
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@ -59,6 +59,8 @@ mnemonics starting with @code{-} revoke the respective functionality:
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@code{-march=z80-full+xyhl} first removes all default extentions and adds
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support for index registers halves only.
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If this option is not specified then @code{-march=z80+xyhl+infc} is assumed.
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@cindex @code{-local-prefix} command-line option, Z80
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@item -local-prefix=@var{prefix}
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Mark all labels with specified prefix as local. But such label can be
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@ -67,7 +69,7 @@ local label prefix @code{.L}, it is just adds new one.
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@cindex @code{-colonless} command-line option, Z80
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@item -colonless
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Accept colonless labels. All names at line begin are treated as labels.
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Accept colonless labels. All symbols at line begin are treated as labels.
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@cindex @code{-sdcc} command-line option, Z80
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@item -sdcc
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@ -215,59 +217,86 @@ Supported half, single and double precision IEEE754 compatible numbers.
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@node Z80 Directives
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@section Z80 Assembler Directives
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@cindex Z80-only directives
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@command{@value{AS}} for the Z80 supports some additional directives for
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compatibility with other assemblers.
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@cindex Z80-only directives
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These are the additional directives in @code{@value{AS}} for the Z80:
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@table @code
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@item assume @var{ADL}@samp{=}@var{expression}
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@item @code{.assume ADL = @var{expression}}
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@cindex @code{.assume} directive, Z80
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Set ADL status for eZ80. Non-zero value enable compilation in ADL mode else
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used Z80 mode. ADL and Z80 mode produces incompatible object code. Mixing
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both of them within one binary may lead problems with disassembler.
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@item db @var{expression}|@var{string}[,@var{expression}|@var{string}...]
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@itemx defb @var{expression}|@var{string}[,@var{expression}|@var{string}...]
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@itemx defm @var{string}...]
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@item @code{db @var{expression}|@var{string}[,@var{expression}|@var{string}...]}
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@cindex @code{db} directive, Z80
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@itemx @code{defb @var{expression}|@var{string}[,@var{expression}|@var{string}...]}
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@cindex @code{defb} directive, Z80
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@itemx @code{defm @var{string}[,@var{string}...]}
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@cindex @code{defm} directive, Z80
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For each @var{string} the characters are copied to the object file, for
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each other @var{expression} the value is stored in one byte.
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A warning is issued in case of an overflow.
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Backslash symbol in the strings is generic symbol, it cannot be used as
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escape character (for this purpose use @code{.ascii} or @code{.asciiz}
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directives).
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escape character (@xref{Ascii,,@code{.ascii}}).
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@item dw @var{expression}[,@var{expression}...]
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@itemx defw @var{expression}[,@var{expression}...]
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@item @code{dw @var{expression}[,@var{expression}...]}
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@cindex @code{dw} directive, Z80
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@itemx @code{defw @var{expression}[,@var{expression}...]}
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@cindex @code{defw} directive, Z80
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For each @var{expression} the value is stored in two bytes, ignoring
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overflow.
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@item d24 @var{expression}[,@var{expression}...]
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@itemx def24 @var{expression}[,@var{expression}...]
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@item @code{d24 @var{expression}[,@var{expression}...]}
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@cindex @code{d24} directive, Z80
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@itemx @code{def24 @var{expression}[,@var{expression}...]}
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@cindex @code{def24} directive, Z80
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For each @var{expression} the value is stored in three bytes, ignoring
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overflow.
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@item d32 @var{expression}[,@var{expression}...]
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@itemx def32 @var{expression}[,@var{expression}...]
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@item @code{d32 @var{expression}[,@var{expression}...]}
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@cindex @code{d32} directive, Z80
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@itemx @code{def32 @var{expression}[,@var{expression}...]}
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@cindex @code{def32} directive, Z80
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For each @var{expression} the value is stored in four bytes, ignoring
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overflow.
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@item ds @var{count}[, @var{value}]
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@itemx defs @var{count}[, @var{value}]
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@item @code{ds @var{count}[, @var{value}]}
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@cindex @code{ds} directive, Z80
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@itemx @code{defs @var{count}[, @var{value}]}
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@cindex @code{defs} directive, Z80
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@c Synonyms for @code{ds.b},
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@c which should have been described elsewhere
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Fill @var{count} bytes in the object file with @var{value}, if
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@var{value} is omitted it defaults to zero.
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@item @var{symbol} equ @var{expression}
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@itemx @var{symbol} defl @var{expression}
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These directives set the value of @var{symbol} to @var{expression}. If
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@code{equ} is used, it is an error if @var{symbol} is already defined.
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Symbols defined with @code{equ} are not protected from redefinition.
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@item @code{@var{symbol} defl @var{expression}}
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@cindex @code{defl} directive, Z80
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The @code{defl} directive is like @code{.set} but with different syntax (@xref{Set,,@code{.set}}).
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It set the value of @var{symbol} to @var{expression}. Symbols defined
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with @code{defl} are not protected from redefinition.
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@item psect @var{name}
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A synonym for @xref{Section}, no second argument should be given.
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@item @code{@var{symbol} equ @var{expression}}
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@cindex @code{equ} directive, Z80
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The @code{equ} directive is like @code{.equiv} but with different syntax (@xref{Equiv,,@code{.equiv}}).
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It set the value of @var{symbol} to @var{expression}. It is an error
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if @var{symbol} is already defined. Symbols defined with @code{equ}
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are not protected from redefinition.
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@item @code{psect @var{name}}
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@cindex @code{psect} directive, Z80
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A synonym for @code{.section}, no second argument should be given (@xref{Section,,@code{.section}}).
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@item @code{xdef @var{symbol}}
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@cindex @code{xdef} directive, Z80
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A synonym for @code{.global}, make @var{symbol} is visible to linker (@xref{Global,,@code{.global}}).
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@item @code{xref @var{name}}
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@cindex @code{xref} directive, Z80
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A synonym for @code{.extern} (@ref{Extern,,@code{.extern}}).
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@ignore
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The following attributes will possibly be recognized in the future
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