@ -24,87 +24,125 @@
@end menu
@node Z80 Options
@section Options
@section Command-line Options
@cindex Z80 options
@cindex options for Z80
@table @option
@c man begin OPTIONS
@table @gcctabopt
@cindex @code{-z80} command-line option, Z80
@item -z80
Produce code for the Z80 processor. By default accepted undocumented
operations with halves of index registers (IXL, IXH, IYL, IYH) and
instuction IN F,(C). Other useful undocumented instructions produces
operations with halves of index registers (@code{ IXL} , @code{ IXH} , @code{ IYL} , @code{ IYH} ) and
instuction @code{ IN F,(C)} . Other useful undocumented instructions produces
warnings. Undocumented instructions may not work on some CPUs, use
them on your own risk.
@cindex @code{-r800} command-line option, R80 0
@cindex @code{-r800} command-line option, Z8 0
@item -r800
Produce code for the R800 processor.
@cindex @code{-z180} command-line option, Z1 80
@cindex @code{-z180} command-line option, Z80
@item -z180
Produce code for the Z180 processor.
@cindex @code{-ez80} command-line option, e Z80
@cindex @code{-ez80} command-line option, Z80
@item -ez80
Produce code for the eZ80 processor in Z80 memory mode by default.
@cindex @code{-ez80-adl} command-line option, e Z80
@cindex @code{-ez80-adl} command-line option, Z80
@item -ez80-adl
Produce code for the eZ80 processor in ADL memory mode by default.
@cindex Compatibility options
@item @code{-colonless}
@cindex @code{-local-prefix} command-line option, Z80
@item -local-prefix=@var{prefix}
Mark all labels with specified prefix as local. But such label can be
marked global explicitly in the code. This option do not change default
local label prefix @code{.L}, it is just adds new one.
@cindex @code{-colonless} command-line option, Z80
@item -colonless
Accept colonless labels. All names at line begin are treated as labels.
@item @code{-sdcc}
Accept assembler code produces by SDCC.
@cindex @code{-sdcc} command-line option, Z80
@item -sdcc
Accept assembler code produced by SDCC.
@cindex @code{-fp-s} command-line option, Z80
@item -fp-s=@var{FORMAT}
Single precision floating point numbers format. Default: ieee754 (32 bit).
@cindex Undocumented instruction control
@item @code{-strict}
@cindex @code{-fp-d} command-line option, Z80
@item -fp-d=@var{FORMAT}
Double precision floating point numbers format. Default: ieee754 (64 bit).
@cindex @code{-strict} command-line option, Z80
@item -strict
Accept documented instructions only.
@item @code{-full}
@cindex @code{-full} command-line option, Z80
@item -full
Accept all known Z80 instructions.
@item @code{ -with-inst=INST[,...]}
@itemx @code{ -Wnins INST[,...]}
@item -with-inst=@var{ INST} [,...]
@itemx -Wnins @var{ INST} [,...]
Enable specified undocumented instruction(s).
@item @code{ -without-inst=INST[,...]}
@itemx @code{ -Fins INST[,...]}
@item -without-inst=@var{ INST} [,...]
@itemx -Fins @var{ INST} [,...]
Disable specified undocumented instruction(s).
@cindex Obsolete options
@item @code{-ignore-undocumented-instructions}
@itemx @code{-Wnud}
@item -ignore-undocumented-instructions
@itemx -Wnud
Silently assemble undocumented Z80-instructions that have been adopted
as documented R800-instructions .
@item @code{ -ignore-unportable-instructions}
@itemx @code{ -Wnup}
@item -ignore-unportable-instructions
@itemx -Wnup
Silently assemble all undocumented Z80-instructions.
@item @code{ -warn-undocumented-instructions}
@itemx @code{ -Wud}
@item -warn-undocumented-instructions
@itemx -Wud
Issue warnings for undocumented Z80-instructions that work on R800, do
not assemble other undocumented instructions without warning.
@item @code{ -warn-unportable-instructions}
@itemx @code{ -Wup}
@item -warn-unportable-instructions
@itemx -Wup
Issue warnings for other undocumented Z80-instructions, do not treat any
undocumented instructions as errors.
@item @code{ -forbid-undocumented-instructions}
@itemx @code{ -Fud}
@item -forbid-undocumented-instructions
@itemx -Fud
Treat all undocumented z80-instructions as errors.
@item -forbid-unportable-instructions
@itemx @code{ -Fup}
@itemx -Fup
Treat undocumented z80-instructions that do not work on R800 as errors.
@end table
@c man end
Floating point numbers formats.
@table @option
@item @code{ieee754}
Single or double precision IEEE754 compatible format.
@item @code{half}
Half precision IEEE754 compatible format (16 bits).
@item @code{single}
Single precision IEEE754 compatible format (32 bits).
@item @code{double}
Double precision IEEE754 compatible format (64 bits).
@item @code{zeda32}
32 bit floating point format from z80float library by Zeda.
@item @code{math48}
48 bit floating point format from Math48 package by Anders Hejlsberg.
@end table
Known undocumented instructions.
@table @option
@cindex Known undocumented instructions
@item @code{idx-reg-halves}
All operations with halves of index registers (IXL, IXH, IYL, IYH).
All operations with halves of index registers (@code{ IXL} , @code{ IXH} , @code{ IYL} , @code{ IYH} ).
@item @code{sli}
SLI or SLL instruction. Same as @code{SLA r; INC r}.
@code{ SLI} or @code{ SLL} instruction. Same as @code{SLA r; INC r}.
@item @code{op-ii-ld}
Istructions like @code{<op> (<ii>+<d>),<r>}. For example: @code{RL (IX+5),C}
@item @code{in-f-c}
@ -132,6 +170,7 @@ The suffix @samp{b} denotes a backreference to local label.
* Z80-Chars:: Special Characters
* Z80-Regs:: Register Names
* Z80-Case:: Case Sensitivity
* Z80-Labels:: Labels
@end menu
@node Z80-Chars
@ -191,11 +230,35 @@ The case of letters is significant in labels and symbol names. The case
is also important to distinguish the suffix @samp{b} for a backward reference
to a local label from the suffix @samp{B} for a number in binary notation.
@node Z80-Labels
@subsection Labels
@cindex labels, Z80
@cindex Z80 labels
Labels started by @code{.L} acts as local labels. You may specify custom local
label prefix by @code{-local-prefix} command-line option.
Dollar, forward and backward local labels are supported. By default, all labels
are followed by colon.
Legacy code with colonless labels can be built with @code{-colonless}
command-line option specified. In this case all tokens at line begin are treated
as labels.
@node Z80 Floating Point
@section Floating Point
@cindex floating point, Z80
@cindex Z80 floating point
Floating-point numbers are not supported.
Floating-point numbers of following types are supported:
@table @option
@item @code{ieee754}
Supported half, single and double precision IEEE754 compatible numbers.
@item @code{zeda32}
32 bit floating point numbers from z80float library by Zeda.
@item @code{math48}
48 bit floating point numbers from Math48 package by Anders Hejlsberg.
@end table
@node Z80 Directives
@section Z80 Assembler Directives
@ -208,15 +271,19 @@ These are the additional directives in @code{@value{AS}} for the Z80:
@table @code
@item assume @var{ADL}@samp{=}@var{expression}
Set ADL status for eZ80. Non-null value enable compilatio n ADL mode else
Set ADL status for eZ80. Non-zero value enable compilation i n ADL mode else
used Z80 mode. ADL and Z80 mode produces incompatible object code. Mixing
both of them within one binary may lead problems with disassembler.
@item db @var{expression}|@var{string}[,@var{expression}|@var{string}...]
@itemx defb @var{expression}|@var{string}[,@var{expression}|@var{string}...]
@itemx defm @var{string}...]
For each @var{string} the characters are copied to the object file, for
each other @var{expression} the value is stored in one byte.
A warning is issued in case of an overflow.
Backslash symbol in the strings is generic symbol, it cannot be used as
escape character (for this purpose use @code{.ascii} or @code{.asciiz}
directives).
@item dw @var{expression}[,@var{expression}...]
@itemx defw @var{expression}[,@var{expression}...]
@ -289,7 +356,7 @@ The assembler also supports the following undocumented Z80-instructions,
that have not been adopted in any other instruction set:
@table @code
@item out (c),0
Sends zero to the port pointed to by register c.
Sends zero to the port pointed to by register @ code{C} .
@item sli @var{m}
Equivalent to @code{@var{m} = (@var{m}<<1)+1}, the operand @var{m} can
Sergey Belyashov
6 years ago
Nick Clifton