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AMD
29K dependent features
See
the following documentation for the AMD 29K architecture’s features and
options for the assembler.
Options
for AMD29K
as
has no additional command-line options for the AMD 29K family.
Macros
for AMD29K
The
macro syntax used on the AMD 29K is like that described in the AMD 29K
Family Macro Assembler Specification. Normal as
macros should still work.
Special
characters for AMD29K
;
is the line comment character.
The
question mark character, ?,
is permitted in identifiers (but may not begin an identifier).
General-purpose
registers are represented by predefined symbols of the form GRnnn
(for global registers) or LRnnn
(for local registers), where nnn
represents a number between 0
and 127,
written with no leading zeros. The leading letters may be in either upper
or lower case; for example, gr13
and LR7
are both valid register names.
You
may also refer to general-purpose registers by specifying the register
number as the result of an expression (prefixed with %%
to flag the expression as a register number), as in the following example.
expression
in the previous example’s case must be an absolute expression evaluating
to a number between 0
and 255.
The range [0, 127] refers to global registers, and the range [128, 255]
to local registers.
In
addition, as
understands the protected special-purpose register names for the AMD 29K
family, as in the following.
vab
chd pc0
ops
chc pc1
cps
rbp pc2
cfg
tmc mmu
cha
tmr lru
These
unprotected special-purpose register names are also recognized:
ipc
alu fpe
ipa
bp inte
ipb
fc fps
q
cr exop
Floating
point for AMD29K
The
AMD 29K family uses IEEE floating-point numbers.
Machine
directives for AMD29K
.block size, fill
This directive emits size
bytes, each of value fill.
Both size
and fill
are absolute expressions. If the comma and fill
are omitted, fill
is assumed to be zero. In other versions of the GNU assembler, this directive
is called .space.
.cputype
This directive is ignored;
it is accepted for compatibility with other AMD 29K assemblers.
.file
This directive is ignored;
it is accepted for compatibility with other AMD 29K assemblers.
Warning:
In other versions of the
GNU assembler, .file
is used for the directive called .app-file
in the AMD 29K support.
.line
This directive is ignored;
it is accepted for compatibility with other AMD 29K assemblers.
.sect
This directive is ignored;
it is accepted for compatibility with other AMD 29K assemblers.
.use section name
Establishes the section
and subsection for the following code; section name may be one of .text,
.data,
.data1,
or .lit.
With one of the first three section
name
options, .use
is equivalent to the machine directive, section
name;
the remaining case, .use
.lit,
is the same as .data
200.
Opcodes
for AMD29K
as
implements all the standard AMD 29K opcodes. No additional pseudo-instructions
are needed on this family.
For
information on the 29K machine instruction set, see Am29000 User’s
Manual from Advanced Micro Devices, Inc.
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